Relevant bibliographies by topics / Beef cows

Academic literature on the topic 'Beef cows'

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Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Beef cows"

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Hickson, R. E., R. L. Laven, N. Lopez-Villalobos, P. R. Kenyon, and S. T. Morris. "Postpartum anoestrous interval in first-lactation beef and dairy-beef crossbred cows." Animal Production Science 52, no. 7 (2012): 478. http://dx.doi.org/10.1071/an11288.

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In New Zealand, beef-breeding cows are required to wean a calf every year, and the weight of calf at weaning is a major driver of the efficiency of the breeding cow. Weaning weight can be increased by increasing milk yield of the cow such as by incorporating dairy breed genetics into the breeding cows, and by having early born calves which are, therefore, older at weaning. This experiment examined postpartum anoestrous interval and pregnancy rate to rebreeding in 109 beef-breed and beef-cross-dairy breed first-lactation cows suckling their own calves. Cows with a Jersey component had a shorter postpartum anoestrous interval than cows without (90 versus 97–101 days; P < 0.05). Pregnancy rates after 42 days of joining with bulls were 83–97% for straight-bred Angus, Angus-cross-Friesian, Angus-cross-Jersey and Angus-cross-Kiwicross (Friesian-cross-Jersey) cows, but only 41% for straight-bred Friesian cows (P < 0.05). For every day younger heifers reached puberty, postpartum anoestrous interval was reduced by 0.07 ± 0.02 days (P < 0.01) indicating that age at puberty could be used as a predictor of subsequent fertility. The Jersey-component cows offered advantages in fertility traits and may be worthwhile incorporating into beef-breeding cow herds.
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McGregor, B. A., and J. F. Graham. "Fibre production by beef cows." Animal Production Science 50, no. 6 (2010): 568. http://dx.doi.org/10.1071/an09219.

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Cattle grow and shed fibre which assists them adapt to seasonal changes in the environment. In the absence of cattle fibre production data for southern Australia, Angus, Hereford, Simmental and Limousin cows and crosses between these breeds grazing perennial pastures at Hamilton, Victoria were sampled in late winter. The fibre-growing area on the sides of cattle was measured, fibre sampled at the mid-side site and the sampling area determined. Fibre was tested for fibre diameter distribution, clean washing yield and fibre length measured. Cows were 3–7 years of age, liveweights were 412–712 kg and the mean fibre-growing area was 2.2 m2. This produced an average 682 g of total fibre (range 346–1175 g). The mean fibre diameter of all fibres was 51.7 µm (range 43–62 µm) and 18% of fibres were <36 µm (range 6–39%). The clean washing yield was 92.4% (range 87.4–95.8%). Fibre length averaged 21 mm. Increasing the age, liveweight and condition score of cows and increasing weight of clean fibre were associated with significant increases in mean fibre diameter. Breed of cattle did not affect fibre production (P > 0.1) but did affect mean fibre diameter (P < 0.05). The quantity of fibre production indicates potential for low value textile production. The high level of total fibre production, twice that of an earlier report, and fibre shedding from cattle suggests that white fibre-producing animals such as Merino sheep, Angora and cashmere goats and alpaca should avoid using cattle-handling facilities, particularly in the month before shearing.
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Morter, Raymond L., Charles H. Armstrong, Harold E. Amstutz, and H. Leon Thacker. "Systemic Salmonellosis in Mature Beef Cows." Journal of Veterinary Diagnostic Investigation 1, no. 1 (January 1989): 22–24. http://dx.doi.org/10.1177/104063878900100108.

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Systemic infection of mature beef cows with Salmonella typhimurium resulted in death of cows, abortions, and premature births. Salmonella typhimurium was isolated from the kidney, liver, and spleen of cows but not from an aborted fetus. Diarrhea was not a prominent clinical feature of the epizootic. The source of the salmonella was not determined.
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Santos, N. R., G. C. Lamb, D. R. Brown, and R. O. Gilbert. "Postpartum endometrial cytology in beef cows." Theriogenology 71, no. 5 (March 2009): 739–45. http://dx.doi.org/10.1016/j.theriogenology.2008.09.043.

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Mathis, Clay P., and Jason E. Sawyer. "Nutritional Management of Grazing Beef Cows." Veterinary Clinics of North America: Food Animal Practice 23, no. 1 (March 2007): 1–19. http://dx.doi.org/10.1016/j.cvfa.2006.12.001.

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Lira, Stephen M., Jon T. Biermacher, Evan Whitley, and Devlon Ford. "185 Strategies for managing open beef cows." Journal of Animal Science 97, Supplement_1 (July 2019): 63. http://dx.doi.org/10.1093/jas/skz053.142.

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Abstract Open beef cows account for between 15 and 30% of a spring-calving cow/calf operation’s annual revenue; however, most producers commonly sell open cows at weaning when prices are at a seasonal low. A three-year (2015–2018) study was conducted using open beef cows (n = 244) from a spring-calving herd in south-central Oklahoma. The objective of the study was to determine whether or not the net return of retaining, feeding, rebreeding, and marketing rebred cows was greater than the revenue from selling open cows at weaning. Each year at weaning, open cows were sorted into Thin or Moderate groups using an average threeman Body Condition Score (BCS). Thin cows (BCS < 5.5) received a ration of 11.4% CP and 63.9% TDN, while Moderate cows (5.5 ≤ BCS ≤ 6.0) received 10.4% CP and 55.2% TDN. Rations were formulated to transform the final condition of all cattle to a BCS of 6. Two rested bulls were assigned to each feeding group during the first 60 days of retention. After 90 days of retention all cattle were pregnancy tested via ultrasound. Enterprise budgeting techniques were used to calculate revenue, costs, and net return for each cow. Mixed effects (ANOVA) models using the Mixed Procedure in SAS were used to determine the fixed effects of feeding treatment, age, pregnancy status, and market type on ending weight and BCS and net return. Year and individual animal were tested and treated as random for each model analyzed. On average, net return was affected by feeding treatment (P = 0.0323), age (P < 0.0001), and pregnancy status (P < 0.0001). The results suggest that producers who have the ability to sort and feed young, thin cows in poorer condition and rebreed them using rested bulls can expect to earn $68/head more than selling them as open at weaning
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Bailey, C. R., A. L. Goetsch, D. S. Hubbell, and C. F. Rosenkrans, Jr. "Effects of monensin on beef cow reproduction." Canadian Journal of Animal Science 88, no. 1 (March 1, 2008): 113–15. http://dx.doi.org/10.4141/cjas07082.

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This study was designed to evaluate the effects of monensin with or without grain supplementation on reproduction of beef cows consuming bermudagrass hay. Monensin supplemented at 200 mg head-1 d-1, with or without grain supplementation, shortened the period from calving to conception and increased calving percentage in beef cows consuming bermudagrass hay. Key words: Monensin, beef cows, reproduction
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Khakimov, Ismagil, Rinat Mudarisov, and Aleksandr Akimov. "BEEF COWS BODY CONDITION SCORING AND ITS MEASUREMENTS RELATIONSHIP." Bulletin Samara State Agricultural Academy 5, no. 2 (May 8, 2020): 40–46. http://dx.doi.org/10.12737/37338.

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The purpose of the study is improving the efficiency of breeding work in selection of cows by live weight, body measurements with mandatory consideration of animal condition score. The degree and nature of relationship be-tween live weight and body measurements of beef cows with condition score, regression coefficient were calculat-ed. The research was carried out on beef Hereford and Kazakh white-headed cows. A high positive relationship between live weight, body measurements and the condition score of cows was established. The regression coeffi-cient showed that change in finish by 1 point increases the live weight of Hereford cows of the first group by 46.3 kg, the second – by 44.2 kg, and the third – by 42.1 kg. The cows of the second group have the largest bulk, they signif-icantly exceeded the Hereford and Kazakh white-headed cows of the first and third groups by this indicator. The difference was 51.2 and 45.9 kg, respectively, the coefficients of variability – varied between 4.1 to 9.2%. Hereford Cows of the second group were superior in heart girth (with a difference of 4 cm) to cows of the first group and 10.6 cm to cows of the third group. The coefficients of variability ranged within 12.9 to 27.0 %. In terms to heart girth (by 1.05 and 0.95 cm) and chest depth (by 8.9 and 2.9 cm), the cows of the second group were superior to the cows of the first and the third groups, respectively (the difference is not reliable). The variation coefficients ranged within 10.3 to 15.7% for heart girth and from 13.0 to 16.7% for chest depth.
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Blasi, D. A., J. K. Ward, T. J. Klopfenstein, and R. A. Britton. "Escape protein for beef cows: III. Performance of lactating beef cows grazing smooth brome or big bluestem." Journal of Animal Science 69, no. 6 (1991): 2294. http://dx.doi.org/10.2527/1991.6962294x.

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Vaz, Ricardo Zambarda, José Fernando Piva Lobato, João Restle, Pablo Tavares Costa, Otoniel Geter Lauz Ferreira, Javier alexander Bethacourt Garcia, Lidiane Raquel Eloy, and João Luiz Benavides Costa. "Effect of live weight of beef cows on calf production efficiency." Research, Society and Development 9, no. 9 (September 2, 2020): e679007632. http://dx.doi.org/10.33448/rsd-v9i9.7632.

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The objective was to evaluate the development and reproductive performance of beef cows of different body weights at calving were evaluated. Milk yield and calf production efficiency were assessed in secundiparous Braford cows classified at calving according to weight as Light (325.2±3.7 kg), Moderate (347.7±4.0 kg), and Heavy (384.2±4.1 kg). Heavy cows had higher total milk yield than Light cows, but did not differ from Moderate, reflecting in calves weighing at weaning 82.1, 76.6, and 76.9 kg, respectively. Differences on pregnancy rates for Light (90.0%, 18 pregnant cows/2 of eligible cows), Moderate (70.2%, 12 pregnant cows/5 of eligible cows), and Heavy (62.5%, 10 pregnant cows/6 of eligible cows) were not detected. Light cows were more productive and efficient when production performance was adjusted for the pregnancy rates than Moderate and Heavy cows. Production of kilograms of calves adjusted for pregnancy was 20.5, 16.2±0.5, and 14.0±0.5 kg for the Light, Moderate, and Heavy cows, respectively. Heavy and Moderate cows were less efficient as compared with the Light ones for production of calves adjusted for their calving interval. Light cows produce more kilograms of calf/cow, requiring the same amount of milk to produce one kilogram of calf. Light cows also have higher efficiency converting milk into calf weight than Moderate and Heavy cows. The productivity and efficiency of breeding herds should be evaluated by the combination of pregnancy rate and kilograms of weaned calves per cow exposed to breeding.
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Dissertations / Theses on the topic "Beef cows"

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Casey, Susan C. "Product development and marketing of cull cows /." abstract and full text PDF (UNR users only), 2008. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1461531.

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Thesis (M.S.)--University of Nevada, Reno, 2008.
"December, 2008." Includes bibliographical references (leaves 27-31). Library also has microfilm. Ann Arbor, Mich. : ProQuest Information and Learning Company, [2009]. 1 microfilm reel ; 35 mm. Online version available on the World Wide Web.
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Hill, Scott L. "Serum and plasma metabolites and insemination timing associated with greater pregnancy risk in suckled beef cows subjected to artificial insemination programs." Diss., Kansas State University, 2016. http://hdl.handle.net/2097/34458.

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Doctor of Philosophy
Department of Animal Sciences and Industry
Jeffrey S. Stevenson
Four experiments were conducted in beef cows to determine factors that increased the probability of pregnancy per AI when cows are inseminated by appointment. Cows in all experiments were inseminated after a 7-d CO-Synch + CIDR program (100 μg GnRH [2 mL Factrel, Pfizer Animal Health, Whitehouse Station, NJ] 7 d before 25 mg PGF₂[subscript]α [d 0; 5 mL Lutalyse; Pfizer Animal Health]). Experiment 1 compared 1 vs. 2 inseminations and GnRH injection times at 60 and 75 h after the CO-Synch + CIDR program. Delaying AI until 75 h, according to interpretation of estrus-detection patches, for cows not in estrus by 60 h after CIDR insert removal increased (P < 0.05) pregnancy risk (PR) compared with cows not in estrus and inseminated at 60 h (51.4 vs. 41.7%), respectively. The necessity of GnRH injection concurrent with AI was tested in experiment 2. Cows displaying estrus by 65 h that were injected with GnRH had similar PR to cows in estrus and not treated with GnRH (61.9 vs. 60.4%), respectively. Cows in experiment 2 that did not display estrus, but were treated with a GnRH injection at 65 h and then inseminated at 84 h after CIDR insert removal had increased PR compared with similar cows not treated with GnRH (33.4 vs. 15.0%; P < 0.01), respectively. Experiments 3 and 4 were observational studies conducted to determine if blood metabolites glucose and beta-hydroxy butyrate (BHB experiment 3), or physical body and blood metabolites, (glucose, BHB, non-esterified fatty acids [NEFA], blood urea nitrogen [BUN], body weight, rump fat [RF], or BCS; experiment 4) were indicative of future reproductive success in suckled beef cows enrolled in a timed AI program. In experiment 3, plasma glucose concentration 10 d before AI was lesser (P = 0.01; 52.2 vs. 56.9 mg/dL) and serum BHB concentration was lesser (P < 0.01) in cows that became pregnant 35 d after timed AI than for cows that did not become pregnant (600 vs. 690 μM), respectively. Experiment 4 identified relationships between indicators and reproductive success including the finding that serum NEFA concentration 2 to 4 wk before AI is negatively correlated (P < 0.05) with PR to AI.
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Fish, Ronald Dean. "Estrus Synchronization of Beef and Dairy Cows." Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/217055.

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An estrus synchronization trial was conducted to determine the efficacy of adding an injection of gonadotropin releasing hormone (GnRH) at initiation of the controlled intravaginal drug releasing device (CIDR®) progesterone synchronization protocol in heifers. Nulliparous (n=121) beef heifers were randomly assigned to one of two treatment groups. All heifers received a CIDR® implant at the initiation of the breeding season. Half of the heifers (Select Synch) received an injection of GnRH. Heifers in the Select Synch treatment group had a lower numerical response (76.7% versus 88.3%) to treatment (detected in heat) and an overall lower artificial conception rate (46.0% versus 53.3%), but no statistical difference was detected. Days to conception and artificial insemination conception rates for both groups were similar for all heifers inseminated. Three hundred multiparous Hereford, crossbred and composite beef cows were assigned to one of two breeding groups (Early and Late) based on calving date and randomly assigned to receive an injection of GnRH at the time of CIDR® insertion (Select Synch). The addition of GnRH did not impact the percentage of cows detected in estrus or days to conception. Conception rates were not affected by the addition of GnRH (Select Synch), however cows in the early breeding group were more likely to become pregnant (58% versus 45%) by artificial insemination (P<0.02). An experiment evaluated the efficacy of the CIDR® protocol to synchronize estrus in Arizona Holstein dairy cows (n=696). Cows assigned to the CIDR® protocol (n=337) received a CIDR® insert at the end of the voluntary waiting period (55 days). CIDR®s were removed and an injection of prostaglandin was administered seven days after insertion. There was no difference due to CIDR® treatment in number of services per conception or first service conception rate. CIDR® treatment reduced days to first service, days open at first service, and days open (P<0.02). Warm season had a deleterious effect on number of services, days to first service, first service conception rate and days open (P<0.0001). In summary, estrus synchronization improved postpartum reproductive performance; however, thermal stress continues to be a major barrier to reproductive efficiency.
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Kincheloe, Janna Jo. "Variation in supplement intake by grazing beef cows." Thesis, Montana State University, 2004. http://etd.lib.montana.edu/etd/2004/kincheloe/KincheloeJ04.pdf.

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Horsley, Donald Shane. "Determining the Nutritional Status of Mature Beef Cows." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/31211.

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Improved prediction of forage quality and cow performance may enhance the nutritional management of beef cows. In two 12 mo trials, mature beef cows (n=136) grazing tall fescue pastures were used to compare estimates of forage quality and animal performance. Forage quality was estimated by proximate analysis of forage samples (FOR) or by near infrared reflectance spectroscopy of fecal samples (FNIR). Nutritional Balance Analyzer (NutBal), NutBalPro and 1996 NRC Nutrient Requirements of Beef Cattle (NRC) programs were used to predict animal performance. The objectives were to compare FOR and FNIR estimates of CP and TDN and to evaluate the accuracy of cow performance predicted by FNIR-NutBal, FNIR-NutBalPro and FOR-NRC systems. Initial BW, body condition score (BCS), hip height and breed were used to establish cow biotypes for prediction programs. Every 28 d, cow BW and BCS were measured and forage and fecal samples collected. Weather data, cow status and FOR or FNIR results were entered into NutBal, NutBalPro and NRC programs. Forage CP estimated by FNIR (CPFNIR) or FOR (CPFOR) were similar. In trials 1 and 2, correlation coefficients between CPFNIR and CPFOR were r = .24 and r = .43, respectively. Forage TDN estimated by FNIR was greater (P <.05) and lowly or moderately correlated to FOR estimates. Actual BW change between weigh periods (BWCHG) and ADG were similar to NRC predictions, but less (P<.0001) than predicted by NutBal or NutBalPro. The NutBal or NutBalPro mean BCS change between weigh periods (BCSCHG) were greater (P<.001) than NRC or Actual BCSCHG. Actual and NRC BCSCHG were similar (P>.2, trial 1) or tended (P<.1, trial 2) to be similar. Cow performance estimated by NRC was highly correlated to Actual. Absolute differences in animal performance were also investigated for each prediction program. In trials 1 and 2, NutBal and NutBalPro over-predicted BWCHG, ADG and BCSCHG by 40 kg, 1.25 kg/d and .75 BCS, respectively, compared to actual cow performance. It appears that FNIR is a promising predictor of forage CP but not TDN. Also, the FOR-NRC is a satisfactory predictor of cow performance.
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Curtis, LeAnn Elizabeth. "Impact of grazing stockpiled tall fescue of lactating beef cows." Diss., Columbia, Mo. : University of Missouri-Columbia, 2006. http://hdl.handle.net/10355/4574.

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Thesis (M.S.)--University of Missouri-Columbia, 2006.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on April 20, 2009) Includes bibliographical references.
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Nelson, John Stephen. "Fixed-time insemination of porcine luteinizing hormone-treated superovulated beef cows and the resynchronization of beef cows for fixed-time embryo transfer." [College Station, Tex. : Texas A&M University, 2008. http://hdl.handle.net/1969.1/ETD-TAMU-3239.

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Gross, Kathy Lynn. "Nutritional status of beef cows grazing reclaimed strip mined pastures." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/90930.

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A series of four trials over the grazing season were conducted to evaluate the nutritional status of beef cows grazing reclaimed strip-mined pastures in southwestern, Virginia. Blood samples, esophageal fistula forage samples and hand plucked forage samples were taken in each trial. An external marker, Ytterbium, and an internal marker, indigestible neutral detergent fiber (INDF) were used to estimate organic matter intake, fecal output and digestibility. In addition to samples taken during the trials, blood samples and hand plucked forage samples were taken monthly for 11 mo prior to the trial period. In late summer esophageal masticate samples had a low fiber fraction (ADF and NDF), high crude protein and total nonstructural carbohydrates (TNC) which contributed to a high organic matter digestibility. Hand plucked forage samples had higher TNC than esophageal masticate samples. Organic matter digestibility predicted by the internal marker was highest in late summer 61.6%, similar in spring and late fall, and lowest in mid-summer, 52.6% (p < .01). Fecal output was highest in mid-summer and lowest in spring (p < .05). Estimated intake was not significantly different in any of the trials. Although data was variable, forage quality was higher in May, June, October and November samplings, as indicated by highest CP, TNC, and lower NDF and ADF values, compared with July and August data when forage quality was lowest. Packed cell volume, BUN and serum P and Mg concentrations fell within normal ranges for beef cattle. Low BUN values were observed in spring and late fall which corresponded to low crude protein values observed in the esophageal masticate samples for the same trials. Serum Cu was on the low end of normal values in the late spring and decreased to .6 ppm by late fall. Serum K levels were above the expected values for beef cattle. Serum Na concentrations were lower than normal with lowest values observed throughout spring and summer months.
M.S.
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Oliver, Katherine Rene. "Consumption of Endophyte Infected Fescue During Gestation in Beef Cows." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/81478.

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Tall fescue is a widely grown, cool season grass prevalent in the eastern United States that is known for its resistance to abiotic and biotic stresses. A main reason for tall fescue's resistance to these stresses is attributed to the presence of a fungal endophyte. Unfortunately, this endophyte also adversely affects cattle production. Cows consuming the ergot alkaloids produced by these endophytes can exhibit decreased feed intake, growth performance, organ vasoconstriction, and increased rectal temperature. This work is interested in examining how endophyte toxin exposure impacts pregnancy in cattle. Reduced blood flow to the fetus and inadequate maternal nutrition contributes to intra uterine growth restriction (IUGR), and this work proposed that fescue endophyte toxicity affects the gestating cow and fetus. Three studies were completed. In experiment 1, gestating cows grazed high or low endophyte fescue pastures during late gestation to determine if exposure to ergot alkaloids in utero results in IUGR and if calves from these pregnancies have altered growth performance. Creep feeding was evaluated as a mitigation strategy for impaired calf growth due to fescue toxicity, and feedlot performance was evaluated to determine if consuming fescue during gestation and creep feeding would affect feedlot performance. Calf BW was different (P < 0.01) by treatment x time. Birth weights of calves were similar , prior to creep feeding calves exposed to high endophyte fescue were lower, and post-supplementation creep fed calves had increased BW. Days on feed and dressing percentage were decreased in the supplemented group, and marbling score was decreased for both the supplemented and unsupplemented groups following the completion of the feedlot phase (P < 0.05). The second study was setup similar to study one, however cows were exposed to fescue pastures from d 170 of gestation until calving. Calf birth weights did not differ, but weights were increased in the supplemented group post creep feeding (P < 0.05). Average daily gains (ADG) of supplemented calves were greater during the supplementation period (P < 0.01). In the third study, indwelling vaginal temperature probes were used to evaluate differences in body temperature of cows fed fescue seed with high or low levels of ergot alkaloids during early gestation, and in varying environmental conditions. In the winter trial, body temperature was measured hourly from days 0-14 of gestation. In the summer trial, body temperature was measured hourly from days 0-32 of gestation. Body temperatures were different (P < 0.01) between treatments during both trials.
Master of Science
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Bader, Jonathan F. "Management practices to optimize reproductive efficiency in primiparous and multiparous suckled beef cows /." free to MU campus, to others for purchase, 2003. http://wwwlib.umi.com/cr/mo/fullcit?p1418002.

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Books on the topic "Beef cows"

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Rode, L. M. Feeding beef cows and heifers. Ottawa, Ont: Agriculture Canada, 1992.

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Ontario. Ministry of Agriculture and Food. Body Condition Scoring of Beef Cows. S.l: s.n, 1985.

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Holy cow: Indian political chessboard. Delhi: Media House, 2015.

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Duffy, Patrick John Mary. Studies relating to ovulation in beef suckler cows. Dublin: University College Dublin, 1997.

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The myth of the holy cow. New Delhi: Navayana Pub., 2009.

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Hulse, Virgil. Mad cows and milk gate. Phoenix, Or: Marble Mountain Pub., 1996.

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Holy cow: Beef in Indian dietary traditions. New Delhi: Matrix Books, 2002.

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Chenoweth, Peter J. Beef practice: Cow-calf production medicine. Ames, Iowa: Blackwell Pub. Professional, 2005.

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Lorenz, Winston David, ed. Life on a cattle farm. Minneapolis, MN: Carolrhoda Books, 2002.

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Tucker, Gerard T. The developments in the production of beef bred from dairy cows with particular reference to traceability. Uckfield, Sussex: Nuffield Farming Scholarships Trust, 1999.

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Book chapters on the topic "Beef cows"

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Johnson, Walter H., Ben B. Norman, John R. Dunbar, and Michael N. Oliver. "Efficacy of Selenium Pellets in Beef Cows." In Trace Elements in Man and Animals 6, 647–49. Boston, MA: Springer US, 1988. http://dx.doi.org/10.1007/978-1-4613-0723-5_236.

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Gabrieli, R., and E. Misha. "4.4. Monitoring stress behaviour in grazing beef cows." In Precision livestock farming applications, 149–60. The Netherlands: Wageningen Academic Publishers, 2015. http://dx.doi.org/10.3920/978-90-8686-815-5_4.4.

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De La Torre, A., F. Blanc, E. Recoules, D. Egal, and J. Agabriel. "Energy for maintaining liveweight: an indicator of adaptive abilities of beef cows?" In Energy and protein metabolism and nutrition in sustainable animal production, 71–72. Wageningen: Wageningen Academic Publishers, 2013. http://dx.doi.org/10.3920/978-90-8686-781-3_9.

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Prezotto, L. D., L. E. Camacho, C. O. Lemley, F. E. Doscher, J. S. Caton, K. A. Vonnahme, and K. C. Swanson. "Effects of nutrient restriction on liver and small intestine energy use in pregnant beef cows." In Energy and protein metabolism and nutrition in sustainable animal production, 463–64. Wageningen: Wageningen Academic Publishers, 2013. http://dx.doi.org/10.3920/978-90-8686-781-3_173.

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Wood, K. M., C. J. Fitzsimmons, S. P. Miller, B. W. McBride, and K. C. Swanson. "The effect of pregnancy on weight change, visceral organ mass and circulating serum metabolites in mature beef cows." In Energy and protein metabolism and nutrition in sustainable animal production, 465–66. Wageningen: Wageningen Academic Publishers, 2013. http://dx.doi.org/10.3920/978-90-8686-781-3_174.

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King, Martin, and Clare Street. "Mad Cows and Mad Scientists: What Happened to Public Health in the Battle for the Hearts and Minds of the Great British Beef Consumer?" In Representing Health, 115–32. London: Macmillan Education UK, 2005. http://dx.doi.org/10.1007/978-0-230-80248-3_6.

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Caldow, George, and Iain Riddell. "Auditing Beef Cow Herd Reproduction." In Bovine Medicine, 501–5. Chichester, UK: John Wiley & Sons, Ltd, 2015. http://dx.doi.org/10.1002/9781118948538.ch49.

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Scott, Phil. "Beef Suckler Cow Diseases: Monitoring and Surveillance." In Bovine Medicine, 487–92. Chichester, UK: John Wiley & Sons, Ltd, 2015. http://dx.doi.org/10.1002/9781118948538.ch47.

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Retallick, Keela M., and Dan B. Faulkner. "Feed Efficiency in Different Management Systems: Cow-Calf and in the Feedyard." In Feed Efficiency in the Beef Industry, 47–59. Oxford, UK: Wiley-Blackwell, 2012. http://dx.doi.org/10.1002/9781118392331.ch4.

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Garry, Franklyn. "Range Beef Cow and Calf Health and Welfare." In The Welfare of Cattle, 195–204. Boca Raton : Taylor & Francis, 2018.: CRC Press, 2018. http://dx.doi.org/10.1201/b21911-19.

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Conference papers on the topic "Beef cows"

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Carriquiry, M., J. Gómez, A. Casal, M. DoCarmo, and P. Soca. "Maintenance energy requirements of beef cows grazing Campos grasslands." In 6th EAAP International Symposium on Energy and Protein Metabolism and Nutrition. The Netherlands: Wageningen Academic Publishers, 2019. http://dx.doi.org/10.3920/978-90-8686-891-9_70.

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Todd, Richard W., Corey Moffet, James P. S. Neel, Kenneth E. Turner, Jean L. Steiner, and N. Andy Cole. "Enteric methane emissions of beef cows grazing tallgrass prairie pasture on the southern Great Plains." In 10th International Livestock Environment Symposium (ILES X). St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2018. http://dx.doi.org/10.13031/iles.18-102.

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ZVIRBULE, Andra, and Raivis ANDERSONS. "FACTORS INFLUENCING CHANGES OF BEEF CATTLE HERD QUANTITY AND SIZE: CASE OF LATVIA." In RURAL DEVELOPMENT. Aleksandras Stulginskis University, 2018. http://dx.doi.org/10.15544/rd.2017.147.

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Beef production volumes in Latvia have been different over a long period of time, beef output growth has been noted, as well as its sharp decrease, so it is important to analyze, what are the most important factors that are affecting beef production volumes, that will give an idea of the possibilities for beef market regulation. Consequently, the study objective can be defined: Identify factors affecting beef production in Latvia. For this research statistical methods, correlation analysis, induction, deduction, analysis and synthesis were used. These methods gave an accurate picture of factors that are affecting beef production volumes. According to the results, it can be concluded that beef production volumes are significantly affected by such factors as demand for beef. The results of this research indicate that Latvia beef production volumes are affected by the market demand. As an essential factor for increasing the number of beef cattle in Latvia, export opportunities are available where increasing amount of fresh or chilled beef exported in EUR is increasing the number of suckler cows, where there is a close positive relationship (r = 0.76), which indicates an increase in demand from Latvian meat beef holding output. The quality of the soil in the region and climatic conditions will affect the specialization of farms. The largest number of bovine animals is grown in regions of Vidzeme and Latgale, where average cereal production is lowest per hectare. Pierīga and Zemgale regions have high crop yields on average per hectare, so in this region the number of bovine animals is the smallest.
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Parker, Stephen M., Matthew C. Walter, and Daniel V. Sommerville. "Effects of Multiple Co-Linear Flaws on Crack Opening Area." In ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-63689.

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Cracking in boiling water reactor (BWR) core shroud welds has been identified in operating nuclear plants worldwide. The nuclear industry has taken extensive efforts to disposition and evaluate core shroud cracking, most notably within the BWR Vessel and Internals Project (BWRVIP) where many industry guidance documents have been published regarding core shroud integrity [1, 2, 3, 4]. This guidance is predominately focused on evaluating crack stability. Calculating through-wall leakage was not previously a focus of the existing BWRVIP inspection and evaluation (I&E) guidelines for the core shroud; however, there is some guidance in the current documentation. In recent years there has been some evidence of through-wall indications in the core shroud where the through-wall indications were aligned in an array of co-linear, short, flaws. There is currently no BWRVIP document or other open literature, to the authors’ knowledge, that provides insight into whether the crack opening displacements (CODs) for an array of co-linear, through-wall cracks are larger than that calculated for a single through-wall crack. Developing an understanding of the effect of co-linear cracks on the CODs and subsequent crack opening areas (COAs) of each crack is important in augmenting the existing guidance on how to appropriately disposition through-wall cracking in reactor internal components. Specifically, it is important to know if multiple co-linear cracks can lead to individual COAs that are larger than for a single crack of the same length, in order to perform accurate leakage rate calculations. The purpose of the study documented in this paper is to characterize the COA for axial co-linear crack distributions compared to the COA of an individual crack. Cracks that are aligned in series with an uncracked ligament between them are considered to be co-linear. To better understand how these crack distributions behave, an evaluation is conducted to analyze axial co-linear flaw configurations in core shrouds using traditional linear-elastic fracture mechanics (LEFM) and finite element analysis (FEA) techniques. Through FEA, the COAs and displacements of various co-linear flaw configurations are calculated and compared to the COAs for single flaw configurations. These flaw geometries are useful for the purpose of determining the potential core leakage associated with through-wall co-linear cracks. Co-linear crack configurations for a range of crack sizes and geometries are parametrically evaluated based on the ligament length between the co-linear cracks. Results show that crack openings of co-linear flaw configurations compared to a single flaw can vary substantially depending the crack size and ligament length. Trends of these crack openings are summarized within this report. While the object of this work is to provide criteria for the evaluation of reactor internals, the results can be applied to evaluate COD and COA in any component for which the cracking configuration and inherent assumptions of LEFM are applicable.
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Walter, Matthew, and Daniel Sommerville. "Effects of Multiple Parallel Flaws on Crack Opening Area." In ASME 2016 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/pvp2016-63616.

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Cracking in boiling water reactor (BWR) core shroud welds has been identified in operating nuclear plants worldwide. The Boiling Water Reactor Vessel and Internals Project (BWRVIP) has published several reports providing inspection and evaluation (I&E) guidance for intergranular stress corrosion cracking (IGSCC) in the core shroud of BWRs. This guidance is predominately focused on evaluating crack stability. Calculating through-wall leakage was not previously a focus of the existing BWRVIP I&E guidelines for the core shroud; however, there is some guidance in the current documentation. In recent years there has been some evidence of through-wall indications in the core shroud where the through-wall indications were aligned in an array of parallel, short, flaws. BWRVIP-158-A contains rules for treating parallel flaws with respect to calculation of structural margin for both net section collapse (limit load) and brittle fracture (linear elastic fracture mechanics (LEFM)) failure modes. There is currently no BWRVIP document or other open literature, to the authors’ knowledge, that provides insight into whether the crack opening displacements (CODs) for an array of parallel through-wall cracks are larger than that calculated for a single through-wall crack. Developing an understanding of the effect of parallel cracks on the CODs and subsequent crack opening areas (COAs) of each crack is important in augmenting the existing guidance on how to appropriately disposition through-wall cracking in reactor internal components. Specifically, it is important to know if multiple parallel cracks can lead to individual COAs that are larger than for a single crack of the same length, in order to perform accurate leakage rate calculations. This paper documents linear-elastic finite element analyses (FEA) performed to study the effect of a parallel crack configuration on the resulting COA for the set of cracks compared to the COA calculated if each crack was treated as an individual crack, without adjacent cracking present. Various separation distances, number of crack cases and crack lengths are considered. While the object of this work is to provide criteria for the evaluation of reactor internals, the results can be applied to evaluate COD and COA in any component for which the cracking configuration and inherent assumptions of LEFM are applicable.
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Jespersen, Morten Holm Seneka, and Claes Bergholt Hviid. "Inspection of large infrastructure – A new approach using UAVs and virtual inspection tool." In IABSE Conference, Copenhagen 2018: Engineering the Past, to Meet the Needs of the Future. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2018. http://dx.doi.org/10.2749/copenhagen.2018.090.

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<p>In the Scandinavian countries it is common practice for all surfaces of civil structures to be inspected at least every 5-6 years. However, due to insufficient funds and a highly competitive market, not all surfaces are inspected at a hand-near distance. Most often, hands-on inspections are performed by foot, using a lift, by boat or by rope access, typically resulting in an extensive time consumption for large structures. These methods have not changed much over the last decades despite the technical development.<p>Since 2012, COWI has been using Unmanned Aircraft Vehicles (UAVs) for a large number of inspection projects ranging from the simplest jobs such as documenting and calculating volumes of sand piles to complex tasks of, for example, multispectral imaging for environmental analysis.<p>As a natural development, this service evolved and in collaboration with COWIs bridge inspectors a number of trials with UAV inspection on Danish bridges were performed. The first trials were performed to establish a common understanding between bridge inspectors and drone pilots. The bridge inspectors quickly realized the challenge of locating each observation by video due to the comprehensive size of the structure and the many identical spans. Therefore, COWI developed a new tool "COWI Virtual Inspection" (CVI), where a 3D model can be created based on the images from the UAV inspection and on top of this surface model, the images are applied. The new CVI tool has made it easy to locate each visual damage.<p>This has resulted in a new approach for principal inspection of large bridges and will for large structures reduce the hours spent significantly as well as the amount of traffic interruption.<p>In the future, structures can automatically be screened by UAVs, where image recognition software will be able to point out relevant areas, where a hand-near inspection is needed.
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Sakhno, T. A., M. P. Semenenko, and V. N. Grin. "DYNAMICS OF BIOCHEMICAL INDICATORS OF BLOOD IN FRESH COWS ON THE BACKGROUND OF HEPATOPROTECTOR APPLICATION." In "International Scientific and Practical Conference" THEORY AND PRACTICE OF VETERINARY PHARMACY, ECOLOGY AND TOXICOLOGY IN AIC ", dedicated to the centenary of the Department of Pharmacology and Toxicology, SPbSUVM. FSBEI HE St. Petersburg SUVM, 2021. http://dx.doi.org/10.52419/3006-2021-2-211-212.

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The influence of a new injectable hepatoprotective drug livasen in the prevention of hepatosis in highly productive fresh cows has been studied. The performed pharmacoprophylaxis has shown high efficiency in the correction of diseases of the hepatobiliary system and metabolic insufficiency.
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Khanaum, Mosammat Mustari, and Md Saidul Borhan. "Efficacy of Microbial Fuel Cell for bioelectricity generation and pollutant reduction at different CODs of sugar beet processing wastewater." In 2021 ASABE Annual International Virtual Meeting, July 12-16, 2021. St. Joseph, MI: American Society of Agricultural and Biological Engineers, 2021. http://dx.doi.org/10.13031/aim.202100212.

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TRUKHACHEV, Vladimir, Sergey OLEYNIK, Nikolay ZLYDNEV, and Vitaliy MOROZOV. "SCREENING OF COMPLEX VERTEBRAL MALFORMATION (CVM) AND BOVINE LEUKOCYTE ADHESION DEFICIENCY (BLAD) IN THE AYRSHIRE CATTLE BREED IN THE NORTH CAUCASUS." In RURAL DEVELOPMENT. Aleksandras Stulginskis University, 2018. http://dx.doi.org/10.15544/rd.2017.142.

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The Ayrshire dairy breed is renowned for producing large quantities of high quality milk and, therefore, is frequently used for crossbreeding. However, various hereditary anomalies caused by gene mutations have been recently recorded in calves produced by some Ayrshire sires. Most of these anomalies were shown to have a recessive inheritance pattern, thus imposing a threat of unpredictable dramatic changes in cattle genotypes under such factors as genetic drift, selection and inbreeding. The purpose of this study was to examine the susceptibility of the Ayrshire cattle bred in the North Caucasus to such hereditary abnormalities as complex vertebral malformation (CVM) and bovine leukocyte adhesion deficiency (BLAD). The investigation was carried out on 16 cows with various phenotype and reproduction disorders that were selected based on a three-year veterinary observation of 440 livestock animals. The target group cows were generally the descendants of Hannulan Yaskiyri, Riihiviidan Urho Errant and O.R. Lihting. The results demonstrated that no animals under study were the carriers of these genetic disorders, which proved the mutant alleles of BLAD and CVM to be absent from the Ayrshire cattle livestock bred in the North Caucasus. Therefore, the sires of these cattle can be successfully used for breeding.
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Yuan, Qi, Zhen Chen, and Guangyu Zhu. "Blood Flow Dynamic and Fluid-Structure Interaction in Patient-Specific Circle of Willis." In ASME 2009 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2009. http://dx.doi.org/10.1115/sbc2009-206230.

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Over 50% stroke is related to the cerebral artery stenosis. The most common position is in the Circle of Willis (CoW), which is composed of a single anterior communicating artery (ACoA), paired anterior cerebral arteries (ACA), paired middle cerebral arteries (MCA), internal carotid arteries (ICA), posterior communicating arteries (PCoA) and posterior cerebral arteries (PCA). Detailed knowledge of the cerebral hemodynamics is important for a variety of clinical applications [1]. There has been a significant body of research performed on blood flow in the CoW [1,2] treating the cerebral vasculature as a 2D structure. To obtain more accurate hemodynamic results, 3D models should be considered. Studies have been performed on 3D models of the CoW generated from magnetic resonance imaging (MRI) data [3,4]. However, those 3D models neglected the effects of fluid-structure interaction (FSI) between the vessel wall and blood. In this paper, a patient-specific model of CoW from CT scan data was reconstructed and FLUENT 6.1 was used to simulate the blood flow in the CoW. On a special part of CoW, a 3D FSI model for the arteries was introduced to investigate both flow and structure behaviors, as well as their interaction by ADINA 8.3.
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Reports on the topic "Beef cows"

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Maxwell, Dennis R. Cornstalk Strip Grazing Demonstration with Beef Cows. Ames: Iowa State University, Digital Repository, 2013. http://dx.doi.org/10.31274/farmprogressreports-180814-1237.

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Wallace, Logan. Southern Iowa Grazing and Forage Budgets for Beef Cows. Ames: Iowa State University, Digital Repository, 2018. http://dx.doi.org/10.31274/farmprogressreports-180814-2070.

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Bormann, Kelli, Wendy J. Powers, and James R. Russell. Effects of Forage Maturity on Phosphorus Digestion in Beef Cows. Ames (Iowa): Iowa State University, January 2004. http://dx.doi.org/10.31274/ans_air-180814-491.

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Leu, Byron, Daniel D. Loy, and H. Joseph Sellers. Supplementation of Beef Cows Grazing Corn Stalk Residue: A Demonstration. Ames (Iowa): Iowa State University, January 2010. http://dx.doi.org/10.31274/ans_air-180814-503.

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Strohbehn, Daryl R., Marshall V. Ruble, and Daniel G. Morrical. Use of Distillers Grains in Beef Cows Grazing Cornstalks–A Demonstration Project. Ames (Iowa): Iowa State University, January 2007. http://dx.doi.org/10.31274/ans_air-180814-539.

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Gunn, Patrick J., Ron Lemenager, and Allen Bridges. Excess Rumen Undegradable Protein Alters Parameters of Reproductive Function in Beef Cows. Ames (Iowa): Iowa State University, January 2014. http://dx.doi.org/10.31274/ans_air-180814-1138.

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Nelson, Chris O., Rick Sprague, Russell Bredahl, Brian Peterson, William Bartenhagen, and John Klein. Rotational Grazing Demonstrations with Beef Cows on CRP Land in Adams County. Ames: Iowa State University, Digital Repository, 2003. http://dx.doi.org/10.31274/farmprogressreports-180814-836.

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Nelson, Chris, Rick Sprague, Russell Bredahl, and Brian Peterson. Rotational Grazing Demonstrations with Beef Cows on CRP Land in Adams County. Ames: Iowa State University, Digital Repository, 2001. http://dx.doi.org/10.31274/farmprogressreports-180814-1010.

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Nelson, Chris, Rick Sprague, Russell Bredahl, Brian Peterson, William Bartenhagen, John Klein, and Stephen K. Barnhart. Rotational Grazing Demonstrations with Beef Cows on CRP Land in Adams County. Ames: Iowa State University, Digital Repository, 2004. http://dx.doi.org/10.31274/farmprogressreports-180814-2545.

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Doran, Beth, Steven Ensley, Paula Imerman, Daniel D. Loy, Daniel G. Morrical, and Gary P. Munkvold. Lick Tanks to Deliver Condensed Corn Distillers Solubles to Summer Grazing Beef Cows. Ames (Iowa): Iowa State University, January 2008. http://dx.doi.org/10.31274/ans_air-180814-551.

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