Accedi

Bibliografie tematiche / Anas Platyrhynchos

Indice

Articoli di riviste
Tesi
Libri
Capitoli di libri
Atti di convegni

Letteratura scientifica selezionata sul tema "Anas Platyrhynchos"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 20 febbraio 2023

Cita una fonte nei formati APA, MLA, Chicago, Harvard e in molti altri stili

Scegli il tipo di fonte:

Consulta la lista di attuali articoli, libri, tesi, atti di convegni e altre fonti scientifiche attinenti al tema "Anas Platyrhynchos".

Accanto a ogni fonte nell'elenco di riferimenti c'è un pulsante "Aggiungi alla bibliografia". Premilo e genereremo automaticamente la citazione bibliografica dell'opera scelta nello stile citazionale di cui hai bisogno: APA, MLA, Harvard, Chicago, Vancouver ecc.

Puoi anche scaricare il testo completo della pubblicazione scientifica nel formato .pdf e leggere online l'abstract (il sommario) dell'opera se è presente nei metadati.

Articoli di riviste sul tema "Anas Platyrhynchos"

1

Zhang, Yong, Pengfei Wang, Liuqing Yang, Yanbin Liu, Yuping Lu e Xiaokang Zhu. "Novel Swarm Intelligence Algorithm for Global Optimization and Multi-UAVs Cooperative Path Planning: Anas Platyrhynchos Optimizer". Applied Sciences 10, n. 14 (14 luglio 2020): 4821. http://dx.doi.org/10.3390/app10144821.

Testo completo

Abstract (sommario):

In this study, a novel type of swarm intelligence algorithm referred as the anas platyrhynchos optimizer is proposed by simulating the cluster action of the anas platyrhynchos. Starting from the core of swarm intelligence algorithm, on the premise of the use of few parameters and ease in implementation, the mathematical model and algorithm flow of the anas platyrhynchos optimizer are given, and the balance between global search and local development in the algorithm is ensured. The algorithm was applied to a benchmark function and a cooperative path planning solution for multi-UAVs as a means of testing the performance of the algorithm. The optimization results showed that the anas platyrhynchos optimizer is more superior in solving optimization problems compared with the mainstream intelligent algorithm. This study provides a new idea for solving more engineering problems.

Gli stili APA, Harvard, Vancouver, ISO e altri

2

Tu, Yong Gang, e Yan Zhao. "Determination of Multi-Element in Egg of Poyang Lake Anas platyrhynchos by ICP-AES". Advanced Materials Research 605-607 (dicembre 2012): 882–86. http://dx.doi.org/10.4028/www.scientific.net/amr.605-607.882.

Testo completo

Abstract (sommario):

The contents of inorganic elements such as Al, As, Ba, Ca, Cd, Co, Cr, Cu, Fe, Li, K, Mg, Mn, Mo, Na, P, Pb, Zn, Se and Sr in egg of Poyang Lake anas platyrhynchos were determined by using inductively coupled plasma-atomic emission spectrometry (ICP-AES). The recoveries obtained by the standard addition method ranged between 84.4%-113.7%, and RSDs were lower than 8.02%. The measuring method provided better accuracy and precision. The determination results showed that the egg of Poyang lake anas platyrhynchos was rich in essential inorganic elements, and the contents of most of the inorganic elements in yolk were higher than protein. The contents of Cu, Fe, Mn and Zn in edible part of anas platyrhynchos egg were higher than Sheldrake, while the contents of Ca, P and Mg were less than Sheldrake. The contents of Ca, P, and Mg in anas platyrhynchos eggshell were less than Sheldrake

Gli stili APA, Harvard, Vancouver, ISO e altri

3

Faragó, Sándor, Ferenc Jánoska, Péter Pál Hajas e Gyula Kovács. "TŐKÉS RÉCE (Anas platyrhynchos) FAJKEZELÉSI TERVE MAGYARORSZÁGON = MANAGEMENT PLAN FOR MALLARD (Anas platyrhynchos) IN HUNGARY". Magyar Vízivad Közlemények 28 (2016): 115–56. http://dx.doi.org/10.17242/mvvk_28.04.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

4

Oguntunji, A. O., AC Adeola, A. Makram, W. PB Putra e L. O. Oriye. "Phenotypic characterization of the Nigerian Mallard duck (Anas platyrhynchos platyrhynchos)". Indian Journal of Poultry Science 55, n. 3 (2020): 169–77. http://dx.doi.org/10.5958/0974-8180.2020.00031.8.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

5

Grosselet, Manuel, e John M. Focey. "Registro de Carpodacus cassini y Anas platyrhynchos diazi en Oaxaca, México". Huitzil Revista Mexicana de Ornitología 3, n. 1 (7 ottobre 2022): 11–13. http://dx.doi.org/10.28947/hrmo.2002.3.1.10.

Testo completo

Abstract (sommario):

Se reportan los registros de Carpodacus cassinii y Anas platyrhynchos diazi para Oaxaca, México. Los días 9 y 10 de enero de 2001 se observaron 28 individuos de Carpodacus cassinii en la comunidad de Cuajimoloyas, Sierra Norte de Oaxaca (3100 msnm). Por otra parte, del 30 de marzo al 25 de abril de 2001 se observó un individuo de Anas platyrhynchos diazi en la presa Piedra Azul, Teotitlán del Valle (1700 msnm).

Gli stili APA, Harvard, Vancouver, ISO e altri

6

Wereha, Tyler J., e L. James Shapiro. "Examining the preferences of broods of mallard ducklings, Anas platyrhynchos platyrhynchos". Animal Behaviour 78, n. 4 (ottobre 2009): 865–71. http://dx.doi.org/10.1016/j.anbehav.2009.07.008.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

7

Burgess, Elizabeth C. "EXPERIMENTAL INOCULATION OF MALLARD DUCKS (ANAS PLATYRHYNCHOS PLATYRHYNCHOS)WITH BORRELIA BURGDORFERI". Journal of Wildlife Diseases 25, n. 1 (gennaio 1989): 99–102. http://dx.doi.org/10.7589/0090-3558-25.1.99.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

8

Li, H. F., W. Q. Zhu, W. T. Song, J. T. Shu, W. Han e K. W. Chen. "Molecular genetic diversity and origin of Chinese domestic duck breeds". Archives Animal Breeding 53, n. 5 (10 ottobre 2010): 609–17. http://dx.doi.org/10.5194/aab-53-609-2010.

Testo completo

Abstract (sommario):

Abstract. The 667 bp control region of mitochondrial DNA from 8 representative domestic duck breeds in China, which were all native preserved duck breeds, and a mallard (6 Anas zonorhyncha individuals) were sequenced. The genetic polymorphism and the origin of the 8 domestic ducks were analysed. The result showed that the haplotype diversity (Hd) and average nucleotide diversity (Pi) were 0.67136 and 0.19 %, respectively. Hd and Pi of Youxian Sheldrake were the highest in the 8 domestic duck breeds. Kimura-2 parameter genetic distance between the breeds ranged from 0.00056 to 0.00414. The NJ phylogenetic tree and reduced median-joining network chart were constructed by the total 38 haplotypes and 96 sequences, which included 12 sequences of Anas platyrhynchos from GenBank, 6 sequences of Anas zonorhyncha from GenBank and 78 sequences of this study (72 domestic ducks and 6 Anas zonorhyncha). The maternal origin of the 8 domestic ducks all originated from Anas platyrhynchos.

Gli stili APA, Harvard, Vancouver, ISO e altri

9

Weidmann, Uli. "Verhaltensstudien an der Stockente (Anas platyrhynchos L.)". Zeitschrift für Tierpsychologie 13, n. 2 (26 aprile 2010): 208–71. http://dx.doi.org/10.1111/j.1439-0310.1956.tb01672.x.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

10

Weidmann, Uli. "Verhaltensstudien an der Stodkente (Anas platyrhynchos L.)". Zeitschrift für Tierpsychologie 15, n. 3 (26 aprile 2010): 277–300. http://dx.doi.org/10.1111/j.1439-0310.1958.tb00567.x.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Più fonti

Tesi sul tema "Anas Platyrhynchos"

1

Denk, Angelika. "Male and Female Reproductive Tactics in Mallards (Anas platyrhynchos L.)". Diss., lmu, 2005. http://nbn-resolving.de/urn:nbn:de:bvb:19-42673.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

2

Lacombe, A. M. A. "Effects of circulating catecholamines on diving in ducks (Anas platyrhynchos)". Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/30724.

Testo completo

Abstract (sommario):

Plasma catecholamines have been measured in chronically adrenalectomised (ADX) ducks, in chronically adrenal denervated ducks (DNX), in their respective sham-operated controls (SH-adx, SH-dnx) as well as in intact ducks after 3 minutes forced submergence. The results showed that 100% of the plasma Epinephrine (EP) and 40 to 80% of plasma Norepinephrine (NE) released during the dive came from the adrenal glands. 20 to 60% of plasma NE came from endings of the autonomic vascular sympathetic nerves which are strongly stimulated during diving. Adrenal catecholamines were released by nerve activation only; non neural mechanisms did not play any role in their release. Maximum dive times (MDT) in chronically adrenalectomised ducks (ADX: 5 min. 19 ± 20 sec.) and in chronically adrenal denervated ducks (DNX: 7 min. 10 ± 13 sec.) were significantly lower than in sham-operated controls (respectively SH-adx: 9 min. 58 ± 45 sec., SH-dnx: 12 min. 10 ± 28 sec). Venous infusion of catecholamines in ADX and DNX during the dive increased MDT: MDT of DNX ducks perfused with catecholamines (9 min. 46 ± 20 sec.) were significantly higher than in DNX perfused with saline (7 min. 21 ± 17 sec.), but did not reach the MDT observed in the SH-dnx: other adrenal products must be involved. Diving heart rates of ADX and DNX (at 4 min. dive respectively: 62 ± 16 and 31 ± 2 beats/min.) were significantly higher than in their sham-operated controls (23 ± 3 and 17 ± 2 beats/min.) . Blood pressure during the dive was signifi- cantly lower in ADX and DNX (at 4 min. dive respectively: 93 ± 8 and 98 ± 4 mmHg) compared with their sham-operated controls (131 ± 12 and 118 ± 6 mmHg). Infusion of catecholamines in DNX raised blood pressure towards SH-dnx values, but there was no change in heart rate. PaO₂, CaO₂, pHa and lactate levels in DNX (respectively: 42 ± 2 mmHg, 4.5 ± 0.8 ml 02 /100ml blood, 7.233 ± 0.016, 3.1 + 0.3 mM) were significantly lower than in SH-dnx after 5 minutes submergence (53 ± 1 mmHg, 6.8 ± 0.4 ml 02 /100 ml blood, 7.301 ± 0.007, 4.8 + 0.4 mM). There was also a significant increase of plasma N⁺ (+ 5.4 ± 1.7 mEq/L) in SH-dnx after 5 minutes submergence, but this was not the case in DNX where it was K⁺ (+ 1.1 ± 0.4 mEq/L) which increased. This suggested that adrenal catecholamines increase tolerance to underwater submersion by enhancing peripheral vasoconstriction, thus preserving the O₂ stores for the heart and brain. Moreover, they may affect the acid-base equilibrium during diving by increasing the activity of the Na⁺K⁺ pump and may also have a direct effect on the rate of glycogenolysis. Preventing the actions of catecholamines on the heart by injecting beta-blocker during forced submersion did not decrease MDT; however the cardiovascular response was markedly affected. During beta-blockade, diving heart rate rose steadily from 24 ± 6 beats/minute after 2 minutes to 52 ± 8 beats/minute after 6 minutes diving. In contrast, heart rates remained close to the levels reached at 2 minutes (17 ± 3 and 19 ± 4 beats/minute) throughout the control dives. Perfusion pressure and blood flow have been recorded simultaneously in both hind limbs of ducks. One leg was perfused with different blood mixtures devoid of catecholamines (Test leg) and compared with the other, perfused with the ducks'own blood (autoperfused leg). This showed that hyper-capnia has a depressant effect on the neural component of the peripheral vasoconstriction. Perfusion of test legs with hypoxic-hypercapnic blood to which catecholamines were added, showed that circulating catecholamines are needed to increase peripheral vasoconstriction during diving. In summary, during forced submergence circulating catecholamines, released mainly by the adrenal glands, compensate for the depressant action of hypercapnia on the neural component of peripheral vasoconstriction. Maintenance of this peripheral vasoconstriction during forced diving ensures that O₂ stores are not wasted on peripheral tissues, and this explains how MDT is prolonged.
Science, Faculty of
Zoology, Department of
Graduate

Gli stili APA, Harvard, Vancouver, ISO e altri

3

Cunningham, Emma Jane Ann. "Forced copulation and sperm competition in the mallard Anas platyrhynchos". Thesis, University of Sheffield, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262851.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

4

Cnotka, Julia. "Hirnveränderungen bei domestizierten Landenten (Anas platyrhynchos f.d.)-morphometrische und ethologische Untersuchungen". [S.l.] : [s.n.], 2006. http://deposit.ddb.de/cgi-bin/dokserv?idn=982291108.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

5

Gunnarsson, Gunnar. "Survival patterns and density-dependent processes in breeding mallards Anas platyrhynchos". Doctoral thesis, Umeå : Department of Wildlife, Fish, and Environmental Studies, Swedish University of Agricultural Sciences, 2007. http://epsilon.slu.se/200712.pdf.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

6

Åkerstedt, Lovisa. "Intraspecifik aggression mellan gräsänder (Anas platyrhynchos) i urbana och rurala habitat". Thesis, Karlstads universitet, Institutionen för miljö- och livsvetenskaper (from 2013), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-84260.

Testo completo

Abstract (sommario):

The continuing increase in urbanization is changing the natural habitats of wild animals. Some wildlife have colonized urban areas and are exposed to new stimuli to which they respond differently: some species adapt whereas others thrive. Living in such an environment can lead to increased stress and elevated aggression. The purpose of this study was to examine the intraspecific aggression among mallards (Anas platyrhynchos) in two habitats with different degree of urbanization. Field observations were performed on groups of mallards in urban and rural environments. I predicted that there would be more aggressive behavior among mallards in urban than in rural habitats, based on the hypothesis that increased stress in an urban environment results in elevated aggression. Aggression was defined as the number of attacks, which was classified as chases, nips, and threats. I observed on average more than three times as many attacks (chases, nips and threats) in urban as in rural habitats. In addition, more females relative to males in the groups resulted in more attacks. Wild birds are important to flora, fauna, and man. Because high aggression can affect the fitness of wild urban animals negatively through, for example, physical injuries and increased disease transmission during fights, it is important that humans intervene to prevent this.
Den fortsatta ökande urbaniseringen förändrar vilda djurs naturliga habitat. Vissa vilda djur har koloniserat urbana områden och utsätts för nya stimuli som de responderar olika på: somliga arter anpassar sig medan andra frodas. Att leva i en sådan miljö kan leda till ökad stress och förhöjd aggression. Syftet med denna studie var att undersöka den intraspecifika aggressionen mellan gräsänder (Anas platyrhynchos) i två habitat med olika nivå av urbanisering. Fältobservationer genomfördes på grupper av gräsänder i urbana och rurala miljöer. Jag förväntade mig att det skulle förekomma fler utdelade attacker bland gräsänder i urbana än i rurala habitat, baserat på hypotesen att ökad stress i en urban miljö resulterar i förhöjd aggressivitet. Aggression definierades som antalet utdelade attacker, vilket klassificerades till jagningar, nyp och hot. Jag observerade i medel mer än tre gånger så många attacker (jagningar, nyp och hot) i urbana som i rurala habitat. Utöver detta resulterade fler honor relativt hanar i grupperna i fler attacker. Vilda fåglar är viktiga för flora, fauna och människa. Eftersom hög aggression kan påverka vilda urbana djurs fitness negativt genom till exempel fysiska skador och ökad sjukdomsöverföring vid strid, är det viktigt att människan ingriper för att förhindra detta.

Gli stili APA, Harvard, Vancouver, ISO e altri

7

Cruz, Tiago Miguel Regateiro. "Censo de aves aquáticas em Mira e nidificação de Anas platyrhynchos". Master's thesis, Universidade de Aveiro, 2011. http://hdl.handle.net/10773/7923.

Testo completo

Abstract (sommario):

Mestrado em Biologia Aplicada
Este trabalho foi desenvolvido em duas lagoas de Mira que pertencem à Rede Natura 2000 e teve como principais objectivos monitorizar as espécies de aves aquáticas e estudar a reprodução do Pato-real (Anas platyrhynchos). A monitorização de aves aquáticas foi efectuada com o propósito de avaliar a variação mensal de aves nas 2 lagoas existentes na área de estudo, por forma a obter informação útil para a gestão e ordenamento da zona, bem como para a preservação das espécies. No desenho experimental idealizado optou-se por efectuar quatro contagens por mês em cada lagoa (semanalmente), por forma a avaliar o efeito do aumento de esforço de monitorização em relação a anos anteriores. Os resultados revelaram que a zona de estudo tem uma importância significativa como zona de invernada de aves aquáticas. Algumas espécies apresentam populações residentes estáveis que, sazonalmente, vêm o seu número de indivíduos variar com a chegada e partida de aves migradoras. Com o estudo da reprodução do Pato-real desejou-se obter informação útil para a administração desta relevante espécie cinegética. Para tal, procedeu-se à monitorização da população reprodutora na área de estudo. Sendo a barrinha uma zona de refúgio no período cinegético, de reprodução e de muda para a espécie, realizou-se uma avaliação do sucesso reprodutor e de predação de ninhos. Obteve-se uma taxa média de sucesso reprodutor de 37%. Os resultados relativos aos ninhos reais e ao estudo com ninhos simulados revelaram percentagens de predação de 57%.
Waterfowl monitoring in “Mira” Natura 2000 Site: a contribute towards their management. The aim of this work was to monitorize waterfowl populations and to study the reproduction of the Mallard (Anas platyrhynchos). The waterfowl monitoring was carried out to gather standardized information on monthly populations fluctuations in the 2 lagoons existent in the study area. This information is needed for proper management and wildlife conservation. The experimental design included 4 counts per month (one per week) in each lagoon, to allow an evaluation of the monitoring effort increase comparatively to past years. The results showed that the study area is an important wintering area for waterfowl. Some species have resident individuals, but their populations are dynamic and vary with the arrivals and departures of migratory birds. The aim of the Mallard reproduction study was to collect useful information to this important species management. Thus breeding bird surveys were conducted to this species, at the study area. As the Barrinha is a refugee area during the hunting season, a breeding and moulting area for the Mallard, a reproductive success survey and nest predation evaluation were developed. It was obtained an average rate of breeding success of 37%. The results relative to real nests surveys and the false nests study revealed about 57% of predation.

Gli stili APA, Harvard, Vancouver, ISO e altri

8

Lusimbo, Wanjala Simiyu. "Toxicity of Prudhoe Bay crude oil to mallard duck (Anas platyrhynchos) embryos". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0019/NQ43517.pdf.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

9

Simões, Karina. "Ciclo reprodutivo anual e caracteristicas morfologicas testiculares do pato domestico (Anas platyrhynchos)". [s.n.], 2004. http://repositorio.unicamp.br/jspui/handle/REPOSIP/316734.

Testo completo

Abstract (sommario):

Orientador: Antonio Orsi
Tese (doutorado) - Universidade Estadual de Campinas, Instituto de Biologia
Made available in DSpace on 2018-08-04T00:24:17Z (GMT). No. of bitstreams: 1 Simoes_Karina_D.pdf: 5008621 bytes, checksum: 052a8d69de71694b3bfdb0e3ffdcc5b0 (MD5) Previous issue date: 2004
Resumo: Em aves, a reprodução é um processo cíclico definido, onde a cada ano os órgãos reprodutores crescem e regridem sob a influência de fatores ambientais. Durante o processo de maturação das gônadas e reprodução, o organismo do animal mobiliza energia intensamente. O processo reprodutivo é bem elaborado, incluindo operações especializadas como produção, maturação e liberação de gametas, bem como a síntese de hormônios esteróides sexuais e comportamento sexual. O objetivo do estudo foi conhecer a morfologia testicular do pato doméstico (Anas platyhrynchos) e estabelecer seu ciclo reprodutivo anual, relacionando-o ao nível do hormônio testosterona e a alguns parâmetros do metabolismo energético interligados ao processo reprodutivo. Para isto foram utilizados 36 animais, sendo coletados testículos de 3 animais por mês, visando a descrição morfológica e o estabelecimento do ciclo reprodutivo anual da espécie por meio de microscopia de luz e análise morfométrica. Os espermatozóides foram analisados através de microscopia eletrônica de transmissão e de varredura. Os níveis de testosterona plasmática total foram dosados mensalmente por meio do ¿Kit Cout-A-Count (DPC)¿ e os níveis de glicose sangüínea pelo método colorimétrico. Também foram dosados o glicogênio hepático e muscular pelo método Glicogênio Trinder e lipídeos totais hepático e muscular pelo método de extração com solvente orgânico. O ciclo reprodutivo anual do pato doméstico é caracterizado por quatro fases distintas, se iniciando com a fase reprodutiva no começo do inverno (Julho) e com pico da reprodução na primavera (Outubro), apresentando maiores peso e volume testiculares, e maiores diâmetro dos túbulos seminíferos e altura do epitélio seminífero. A fase regressiva ocorre no final da primavera (Novembro) e início do verão (Dezembro). A fase de quiescência ou repouso testicular é observada durante o verão (Janeiro, Fevereiro), sendo sucedida pela fase de recrudescência que ocorre no outono (Março a Junho), correspondendo à fase mais longa do ciclo. O processo completo da espermatogênese em termos de maturação dos spermatozóides e a espermiação foram notados durante a fase reprodutiva, coincidindo com o pico de testosterona plasmática. Os espermatozóides são caracterizados pela presença de cabeça, curta peça intermediária e uma longa peça principal. No conjunto os espermatozóides são longos, filiformes e cilíndricos. O espermatozóide do pato doméstico é similar ao de outras aves nãopasseriformes correspondendo a um tipo básico de espermatozóide. Concernente ao metabolismo energético somente a glicose sangüínea estava correlacionada ao ciclo reprodutivo anual da espécie, fornecendo energia para o processo reprodutivo
Abstract: In birds, reproduction is a defined cyclic process; in which each year the reproductive organs grow and regress under the influence of environmental factors. During the process of gonadal maturation and reproduction, the organism of the animal intensively mobilizes energy. The reproductive process is well elaborated, including specialized operations such as the production, maturation and release of gametes, as well as the synthesis of sex steroid hormones and sexual behavior. The aim of the present study was to determine the morphology of the testes of the domestic duck (Anas platyrhynchos) and to establish its annual reproductive cycle, correlating it with testosterone levels and some parameters of energy metabolism associated with the reproductive process. Using a total of 36 ducks, testes were collected from 3 animals per month, and the morphology and annual reproductive cycle of the species were determined by light microscopy and morphometric analysis. Spermatozoa were analyzed by transmission and scanning electron microscopy. Total plasma testosterone levels were measured monthly using the Cout-A-Count (DPC) kit and blood glucose levels were determined by a colorimetric method. Hepatic and muscle glycogen was measured by the Trinder glycogen method and total hepatic and muscle lipids using extraction with organic solvents. The annual spermatogenic cycle of the domestic duck is characterized by four distinct phases, starting with the reproductive phase at the beginning of winter (July) and peak reproduction in spring (October), with higher testicular weight and volume, a larger seminiferous tubular diameter and greater seminiferous epithelium height being observed during these periods. The regressive phase occurs at the end of spring (November) and the beginning of summer (December). The phase of quiescence or testicular resting is observed during summer (January, February), followed by the phase of recrudescence that occurs in autumn (March to June), corresponding to the longest phase of the cycle. The complete process of spermatogenesis in terms of spermatozoon maturation and spermiation is noted during the reproductive phase, coinciding with peak plasma testosterone levels. The spermatozoa are long, filiform and cylindric and are characterized by the presence of a head, short middle piece and long principal piece. The spermatozoon of the domestic duck resembles that of other nonpasseriform birds, corresponding to the basic type of spermatozoon. Considering energy metabolism, only blood glucose was correlated with the annual reproductive cycle of the domestic duck, providing energy for the reproductive process
Doutorado
Anatomia
Doutor em Biologia Celular e Estrutural

Gli stili APA, Harvard, Vancouver, ISO e altri

10

Cabral, Liliane Ferreira. "Vacinação de patos-reais (Anas platyrhynchos) contra a gripe aviária em Portugal". Bachelor's thesis, Universidade Técnica de Lisboa. Faculdade de Medicina Veterinária, 2009. http://hdl.handle.net/10400.5/1243.

Testo completo

Abstract (sommario):

Dissertação de Mestrado Integrado em Medicina Veterinária
Na última década, a estirpe asiática H5N1 de alta patogenicidade disseminou-se rapidamente pela Ásia, Europa e África, resultando no morticínio de mais de 250 milhões de aves domésticas e na morte de mais de duas centenas de pessoas, representando uma séria ameaça à Saúde Pública. Os patos, especialmente o pato-real (Anas platyrhynchos), desempenham um papel importante na amplificação e na disseminação do vírus. Por conseguinte, a disponibilização de vacinas que sejam eficazes nesta espécie em condições “de campo” constitui-se como uma ferramenta importante no controlo do vírus. O presente estudo baseia-se no programa de monitorização serológica incluído nos planos de vacinação de emergência e de vacinação preventiva implementados na sequência de um foco de gripe aviária de baixa patogenicidade, subtipo H5N2, ocorrido numa exploração cinegética nacional em Setembro de 2007. A vacinação com duas vacinas inactivadas bivalentes, H5N9/H7N1 e H5N6/H7N7, foi realizada em dois grupos de patos-reais. Posteriormente, foi realizada uma revacinação semestral num destes grupos. A vacinação induziu um título de anticorpos específicos para a hemaglutinina H5 similar nos dois grupos de patos primovacinados, acima do limiar considerado de protecção (4 log2) até pelo menos 16 semanas após a administração do reforço da vacina, tendo-se atingido uma taxa de imunização inicial superior a 80%. A revacinação semestral com o antigénio H5N6 induziu uma resposta humoral pouco exuberante, com persistência de anticorpos protectores apenas até 6 semanas após vacinação. O antigénio de subtipo H7N7 não estimulou o desenvolvimento de uma resposta imunitária humoral protectora para a hemaglutinina H7. Pelo contrário, o antigénio H7N1 induziu um título médio de anticorpos ligeiramente acima do limiar de protecção, que persistiu até pelo menos 26 semanas após o reforço da vacina. Os resultados observados sugerem que numa exploração cinegética deste tipo, em que o risco de contacto com o vírus “de campo” é muito elevado, a revacinação semestral com uma vacina adequada é uma medida complementar importante para limitar a ocorrência de focos secundários da infecção/doença.
ABSTRACT - Vaccination of Mallard Ducks (Anas platyrhynchos) against Avian Influenza in Portugal -- During the last decade, HPAI H5N1 has rapidly spread across Asia, Europe and Africa, leading to the culling of more than 250 million birds and the death of more than two hundred people, posing a serious threat to public health. Ducks, particularly, mallards (Anas platyrhynchos), play an important role in the amplification and spread of the virus. Vaccines that are effective in this species in field conditions will provide an important tool for control of the disease. This study is based on a serological monitoring programme included in the emergency and preventive vaccination plans applied following a LPAI H5N2 outbreak in a game bird holding in Portugal, in 2007. Vaccination with two bivalent, H5N9/H7N1 and H5N6/H7N7, inactivated vaccines was carried out in two groups of mallard ducks. A second vaccination, six months later, was also carried out in one of these groups. The first vaccination induced a similar mean antibody titer specific for H5 hemagglutinin in both groups, above the protective threshold (4 log2) and persistent for at least 16 weeks after the vaccine boost. The proportion of immunized ducks was initially above 80%. Ducks revaccinated six months later with the H5N6 vaccine showed a lower antibody response, which persisted for only 6 weeks after vaccination. The H7N7 vaccine antigen did not simulate a protective immune humoral response specific for H7 hemagglutinin. On the contrary, the mean antibody titers following vaccination with the H7N1 vaccine were slightly above the threshold, persisting for at least 26 weeks after the boost. These results suggest that semestral vaccination with an adequate vaccine is as important additional measure to limit secondary AI outbreaks in this type of farming system, which is at a particularly high risk of exposure to the field virus.

Gli stili APA, Harvard, Vancouver, ISO e altri

Più fonti

Libri sul tema "Anas Platyrhynchos"

1

Kotsios, Mae Melpomeni. Muscle metabolism during simulated forced dives in Pekin ducks (anas platyrhynchos) and neuromuscular blockers as a tool to test for the existence of a central motor. Ottawa: National Library of Canada, 1996.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

2

Lancaster, John Frederick. Inheritance of Plumage Colour in the Common Duck (Anas Platyrhynchos Linné). Springer London, Limited, 2013.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

3

Rutherford, Gregory J. Development of an enzyme-linked immunosorbent assay to detect antibodies against Bacillus thuringiensis subspecies israelensis in Mallard ducks (Anas platyrhynchos). 1992.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

4

Rutherford, Gregory J. Development of an enzyme-linked immunosorbent assay to detect antibodies against Bacillus thuringiensis subspecies israelensis in Mallard ducks (Anas platyrhynchos). 1992.

Cerca il testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

5

S. Kumar, D. Pangeni, X. Yang e S.O. Park*. Effect of ascorbic acid in the drinking water and betaine in the diet on performance, blood haematology, IgG and HSP 70 gene expression in Pekin ducks (Anas platyrhynchos domesticus) reared under high temperatures. Verlag Eugen Ulmer, 2017. http://dx.doi.org/10.1399/eps.2017.177.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Capitoli di libri sul tema "Anas Platyrhynchos"

1

Guillemain, Matthieu, Pär Söderquist, Jocelyn Champagnon e Johan Elmberg. "Mallard (Anas platyrhynchos Linnaeus, 1758)." In Invasive birds: global trends and impacts, 194–99. Wallingford: CABI, 2020. http://dx.doi.org/10.1079/9781789242065.0194.

Testo completo

Abstract (sommario):

Abstract This chapter describes the common terminologies, taxonomy, morphology, geographical distribution, physiology, diet, behaviour, reproduction, habitats, ecology, invasion pathways, environmental impact, control and human use of the mallard (Anas platyrhynchos).

Gli stili APA, Harvard, Vancouver, ISO e altri

2

Kaushik, Kumar Kritartha, e Bolin Kumar Konwar. "Gut Metagenomics of Pati Hanh (Anas platyrhynchos domesticus)". In Molecular Genetics and Genomics Tools in Biodiversity Conservation, 267–80. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-6005-4_13.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

3

Bech, Claus, e Hege Johannesen. "Gas Exchange during Cold Exposure in Pekin Ducks (Anas Platyrhynchos)". In Physiology of Cold Adaptation in Birds, 163–72. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4757-0031-2_17.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

4

Adams, Bradley, e Pam Crabtree. "Duck ( Anas platyrhynchos )". In Comparative Osteology, 367–79. Elsevier, 2012. http://dx.doi.org/10.1016/b978-0-12-388437-4.00021-1.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

5

"Duck (Anas platyrhynchos)". In Encyclopedia of Genetics, Genomics, Proteomics and Informatics, 567. Dordrecht: Springer Netherlands, 2008. http://dx.doi.org/10.1007/978-1-4020-6754-9_4939.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

6

SILVERMAN, SAM, LISA A. TELL, JODY NUGENT-DEAL, KRISTINA PALMER-HOLTRY e KATHY WEST. "Mallard Duck (Anas platyrhynchos)". In Radiology of Birds, 203–26. Elsevier, 2010. http://dx.doi.org/10.1016/b978-072160635-4.50020-6.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

7

"4. Mallard Ducks Anas platyrhynchos". In Avian Cognition, 144–203. 6000 Broken Sound Parkway NW, Suite 300 Boca Raton, FL 33487-2742: CRC Press, 2015. http://dx.doi.org/10.1201/b19850-5.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

8

Magnus, P. D. "Historical Individuals Like Anas platyrhynchos and ‘Classical Gas’". In Art and Abstract Objects, 108–24. Oxford University Press, 2013. http://dx.doi.org/10.1093/acprof:oso/9780199691494.003.0006.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

Atti di convegni sul tema "Anas Platyrhynchos"

1

Huang, Kailiang, Jiwen Wang, Jing Jia, Jianmin Si, Liang Li e Hehe Liu. "Cloning and Characterization of Duck (Anas Platyrhynchos) Myf5 Gene and Comparison with Other Vertebrates". In 2009 2nd International Conference on Biomedical Engineering and Informatics. IEEE, 2009. http://dx.doi.org/10.1109/bmei.2009.5301730.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

2

Li, Liang, Jing Jia, Jian-min Si, Kai-liang Huang e Ji-wen Wang. "Cloning and Characterization of Duck (Anas platyrhynchos) MyoD1 Gene and Comparison with Other Vertebrates". In 2009 3rd International Conference on Bioinformatics and Biomedical Engineering (iCBBE 2009). IEEE, 2009. http://dx.doi.org/10.1109/icbbe.2009.5162509.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

3

Amosov, P. N., e N. A. Baburina. "Features of the nest material of mallards (Anas Platyrhynchos) of the city ponds of St. Petersburg". In ACTUAL PROBLEMS OF ECOLOGY AND ENVIRONMENTAL MANAGEMENT. Federal State Budgetary Educational Institution of Higher Education St. Petersburg State University of Veterinary Medicine, 2022. http://dx.doi.org/10.52419/3006-2022-3-4-6.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

4

"Angiosuppressive and Teratogenic Influence of an Edible Medicinal herb, Insulin plant (Costus igneus) in Mallard Duck (Anas platyrhynchos) Embryos". In Multi-Disciplinary Manila (Philippines) Conferences Jan. 26-27, 2017 Cebu (Philippines). Universal Researchers (UAE), 2017. http://dx.doi.org/10.17758/uruae.ae0117303.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

5

Bojar, H., e I. Bojar. "Assessment of the lead and cadmium contamination levels in the Lublin Region wetlands using mallards (Anas platyrhynchos) as a contamination vector". In ENVIRONMENTAL TOXICOLOGY 2008. Southampton, UK: WIT Press, 2008. http://dx.doi.org/10.2495/etox080151.

Testo completo

Gli stili APA, Harvard, Vancouver, ISO e altri

6

Hüseynəli oğlu Rzayev, Fuad, e Eldar Köçəri oğlu Qasımov. "A systematic review of the parasites (Acanthocephala) of the domestic waterfowl". In I İNTERNATİONAL SCIENTIFIC CONFERENCE ON "FUNDAMENTALS OF MEDICAL SCIENCE". http://aem.az/, 2021. http://dx.doi.org/10.36719/2707-1146/2021/1/1.

Testo completo

Abstract (sommario):

The article presents the information about a systematic review of parasitic worms – acanthocephalans of the domestic waterfowl. Based on our own and literature data, 12 acanthocephala species belonging to the 1 order, 1 family and 5 genera were identified in domestic ducks (Anas platyrhynchos dom.) and geese (Anser anser dom.). Three species of worms are found in domestic waterfowl in Azerbaijan. The acanthocephala Polymorphus magnus have been reported for the first time in Azerbaijan – Khachmaz region in both birds. Six species of acanthocephals parasitize only in anseriformes, and the remaining six species parasitize including other orders of birds (Ciconiiformes, Gruiformes, Galliformes, Podicipediformes, Gaviiformes, Falconiformes, Charadriiformes et al.) and even mammals (Rodentia, Carnivora). Of the registered acanthocephals, 3 species have a small area of distribution, and the remaining 9 species have a wide area. Each species is provided with the following data: scientific name, authority and year, synonyms, final, intermediate and auxiliary hosts, habitat in the bird body, collecting localities and geographic distribution, prevalence (PI) and intensity (II) of infection, literature sources. Keywords: geese, duck, acanthocephala, systematic review, area, hosts

Gli stili APA, Harvard, Vancouver, ISO e altri

7

Hüseynəli oğlu Rzayev, Fuad. "EV SU QUŞLARINDA PARAZİTLİK EDƏN TİKANBAŞLILARIN (ACANTHOCEPHALA) SİSTEMATİK İCMALI". In I İNTERNATİONAL SCIENTIFIC CONFERENCE ON "FUNDAMENTALS OF MEDICAL SCIENCE". https://aem.az/, 2021. http://dx.doi.org/10.36719/2707-1146/2021/01/01/4-13.

Testo completo

Abstract (sommario):

Açar sözlər: qaz, ördək, tikanbaşlılar, sistematik icmal, areal, sahiblər A systematic review of the parasites (Acanthocephala) of the domestic waterfowl Summary The article presents the information about a systematic review of parasitic worms – acanthocephalans of the domestic waterfowl. Based on our own and literature data, 12 acanthocephala species belonging to the 1 order, 1 family and 5 genera were identified in domestic ducks (Anas platyrhynchos dom.) and geese (Anser anser dom.). Three species of worms are found in domestic waterfowl in Azerbaijan. The acanthocephala Polymorphus magnus have been reported for the first time in Azerbaijan – Khachmaz region in both birds. Six species of acanthocephals parasitize only in anseriformes, and the remaining six species parasitize including other orders of birds (Ciconiiformes, Gruiformes, Galliformes, Podicipediformes, Gaviiformes, Falconiformes, Charadriiformes et al.) and even mammals (Rodentia, Carnivora). Of the registered acanthocephals, 3 species have a small area of distribution, and the remaining 9 species have a wide area. Each species is provided with the following data: scientific name, authority and year, synonyms, final, intermediate and auxiliary hosts, habitat in the bird body, collecting localities and geographic distribution, prevalence (PI) and intensity (II) of infection, literature sources. Keywords: geese, duck, acanthocephala, systematic review, area, hosts

Gli stili APA, Harvard, Vancouver, ISO e altri

Offriamo sconti su tutti i piani premium per gli autori le cui opere sono incluse in raccolte letterarie tematiche. Contattaci per ottenere un codice promozionale unico!