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Добірка наукової літератури з теми "Qualité spermatique"
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Статті в журналах з теми "Qualité spermatique"
Aboulmakarim, Siham, Amal Benbella, Houyam Hardizi, Asmaa Zaidouni, and Rachid Bezad. "La détermination de la concentration spermatique : mise en place et validation d’un contrôle interne de qualité." Revue Francophone des Laboratoires 2018, no. 499 (February 2018): 19–26. http://dx.doi.org/10.1016/s1773-035x(18)30050-9.
Повний текст джерелаBosquet, Dorian, Gwendoline Buissart, Marlène Gallet, Florence Scheffler, Elodie Lefranc, Henri Copin, Moncef Benkhalifa, and Rosalie Cabry. "étude des explorations de l’ADN spermatique (fragmentation et index de dénaturation) : vers une meilleure étude de la qualité du sperme ?" Morphologie 105, no. 350 (September 2021): S9. http://dx.doi.org/10.1016/j.morpho.2021.05.019.
Повний текст джерелаCHEMINEAU, P., B. MALPAUX, J. PELLETIER, B. LEBOEUF, J. A. DELGADILLO, F. DELETANG, T. POBEL, and G. BRICE. "Emploi des implants de mélatonine et des traitements photopériodiques pour maîtriser la reproduction saisonnière chez les ovins et les caprins." INRAE Productions Animales 9, no. 1 (February 17, 1996): 45–60. http://dx.doi.org/10.20870/productions-animales.1996.9.1.4034.
Повний текст джерелаCHEMINEAU, P., B. MALPAUX, J. P. BRILLARD, and A. FOSTIER. "Saisonnalité de la reproduction et de la production chez les poissons, oiseaux et mammifères d’élevage." INRAE Productions Animales 22, no. 2 (February 15, 2009): 77–90. http://dx.doi.org/10.20870/productions-animales.2009.22.2.3336.
Повний текст джерелаAuger, J., and P. Jouannet. "Baisse de la production et de la qualite spermatique chez l’homme: Facteurs de variation et problemes méthodologiques." Andrologie 8, no. 1 (March 1998): 9–24. http://dx.doi.org/10.1007/bf03034758.
Повний текст джерелаHammed, O. O. "Evaluation of reproductive hormones and sperm characteristics of five strains of male broiler chicken raised in the derived savanna zone of Nigeria." Nigerian Journal of Animal Production 49, no. 1 (February 25, 2022): 107–14. http://dx.doi.org/10.51791/njap.v49i1.3408.
Повний текст джерелаDaoud, Salima, Nozha Chakroun-Feki, Afifa Sellami, Leila Ammar-Keskes, and Tarek Rebai. "Variabilité inter et intra-opérateur de l’analyse des paramètres spermatiques: résultat d’un programme de contrôle de qualité." Pan African Medical Journal 25 (2016). http://dx.doi.org/10.11604/pamj.2016.25.115.9158.
Повний текст джерелаДисертації з теми "Qualité spermatique"
Meunier, Léna. "Reproductive biology and senescence impact on postcopulatory sexual selection in a wild polyandrous bird, the North African Houbara Bustard (Chlamydotis undulata undulata)." Electronic Thesis or Diss., Bourgogne Franche-Comté, 2024. http://www.theses.fr/2024UBFCK028.
Повний текст джерелаPolyandry, when females mate with multiple males, increases the opportunity for sexual selection to operate, because in addition to competition between males for access to the female (pre-copulatory sexual selection), sperm from different males also compete for fertilization (post-copulatory sexual selection). This often results in most offspring being sired by the last male, a phenomenon called last male precedence (LMP). In addition to mating order, sperm quantity and quality can also influence the outcome of sperm competition. As males age, sperm quality and quantity decrease, resulting in reduced reproductive success. In the North African Houbara Bustard (Chlamydotis undulata undulata), females are polyandrous, and males suffer from reproductive senescence. The thesis aims at improving our understanding of the reproductive biology of houbara bustards, reproductive senescence and its impact on male reproductive success and post-copulatory selection.In the first part, to improve the knowledge of the species’ physiology of reproduction and to construct a solid base for houbara reproductive anatomy and sperm morphology and later storage mechanism in the female tract, we explored anatomy and histology of the female and male reproductive systems during and out of the breeding season and sperm morphology was described. In the second part, we investigated the underlying mechanisms of LMP and the storage dynamics within the oviduct during competitive inseminations. In the third part, we investigated male reproductive senescence and its relationship with post-copulatory selection. This work was divided into four sections to investigate different aspects of reproductive ageing. Firstly, we examined seasonal testosterone levels and a possible age-related pattern. Second, we investigated a possible trade-off between sperm number and quality across ages. Thirdly, to test male age, sperm age, and their possible interaction on sperm quality and reproductive success, sperm ageing in the male tract was investigated by controlling the timing of collection intervals for young and old males. Finally, LMP was studied under controlled experimental conditions to disentangle the effects of male age, mating order, and sperm quality on siring success.This thesis presents the first description of houbara reproductive anatomy and histology and sperm morphology classification. Active sperm displacement is likely to be the main mechanism of LMP. There was no evidence of an age-related pattern of testosterone levels throughout the breeding season. Peak testosterone levels preceded peaks in sexual behaviour and sperm characteristics. We found a positive covariation between sperm quantity and several sperm quality traits, and male age did not influence the strength of this covariation. No evidence of sperm ageing during prolonged storage in the male tract was observed. On the contrary, sperm collected at longer intervals had higher quality, which was reflected in higher hatching success. Consistent with previous work, older males had lower sperm number, volume, motility and velocity and sired offspring with impaired growth rate. Finally, we found no evidence of an age effect on LMP. Regardless of age, sperm from the last male in the insemination sequence sired approximately 60% of the offspring. Overall, this work has provided a better understanding and new insights into the reproductive biology of houbara bustards and the mechanisms of post copulatory selection
Gatimel, Nicolas. "Morphométrie des vacuoles du spermatozoïde humain : intérêt physiopathologique." Thesis, Toulouse 3, 2016. http://www.theses.fr/2016TOU30164.
Повний текст джерелаFor over 30 years, many publications have sought to explain the pathophysiology of human sperm morphological abnormalities and showed correlations between the percentage of normal forms and functional defect and some relationships with some exposure factors. The physiological nature of most of the "features" of human sperm morphology makes the interpretation of human sperm morphology very difficult except for monomorphic defects. To these difficulties of interpretation, come to add the lack of analytical reliability of current techniques for assessing human sperm morphology making very difficult the use of threshold of normal forms for the choice of medical treatment of infertile couple in Assisted Reproductive Treatment. Recently a new aspect of sperm morphology, the head vacuoles, has shown to be of interest. The vacuoles can be easily observed using Nomarski interference contrast microscopy at high magnification: ×6000 to 10000 (optical magnification ×1000 associated with digital enhancements that achieves a final magnification up to 6000) even on motile spermatozoa (MSOME: Motile Sperm Organellar Morphology Examination). The origin of these vacuoles raises many questions. Several studies have found a link between chromatin condensation defects and the presence of sperm head vacuoles and clinical interest of MSOME is still somewhat debated. To add new arguments concerning the origin of the sperm-head vacuoles observed under high magnification with interference contrast microscopy, we carried out in two patients with total globozoospermia confirmed using transmission electron microscopy (TEM), a detailed sperm morphometric analysis with MSOME, an acrosomal status analysis (using fluorescent labelling with peanut agglutinin (PNA) lectins and anti-CD46 antibodies) and a nuclear status analysis (using terminal deoxynucleotidyl transferase-mediated dUTP nick-end labelling assay TUNEL, sperm chromatin structure assay SCSA and aniline blue staining). Our two patients with globozoospermia had relative sperm vacuole areas of 6.3% and 5%, similar to those observed in a reference population of 12 fertile men (5.9%). This study provides further information on the non-acrosomal origin of the sperm-head vacuoles. Since the development of MSOME for observing the cephalic vacuoles at high magnification, no study as yet assessed the effect of cryopreservation on these vacuoles, although sperm freezing-thawing procedures are known to affect sperm quality. In 27 sperm samples from fertile men, morphological analysis at high magnification (·6000) using image analysis software was performed before freezing and after thawing, there was no evidence for any difference in any vacuolar criteria (relative vacuole area, total vacuole area, vacuole area in the anterior, median and basal parts of the head, percentage of spermatozoa with a vacuole area < 6.5% and percentage of spermatozoa with a vacuole area >13%). Freezing-thawing procedures have no effect on human sperm vacuoles. In order to establish reference values concerning sperm vacuoles and to know if the assessment of sperm vacuoles at high magnification can contribute to the explanation of idiopathic infertility, I investigated the number, position and area of sperm head vacuoles using an image analysis software in 50 fertile men and 50 infertile men were within couples who had unexplained infertility and were consulting in our centre. After analysis, the characteristics of sperm head vacuoles (number, area, position) are no different between fertile controls and patients with unexplained infertility
Erraud, Alexandre. "Développement d’un biomarqueur de qualité spermatique chez deux espèces de crevettes Palaemonidae : état des lieux le long du continuum estuaire / littoral de la Seine." Thesis, Normandie, 2018. http://www.theses.fr/2018NORMLH12/document.
Повний текст джерелаThe environment shapes the reproduction's strategy and performance of a population, influencing its fitness and a fortiori its survival. Therefore, biomarkers that alter reproductive functions represent a great interest in ecotoxicology. The reduction of male fertility in wildlife can represent a threat to the population's survival. Moreover, fcw methodologies are available for species that are relevant to address this issue on envimnmental biomonitoring programs, especially for crustaceans, despite their representativeness in the wildlife and their essential functions within ecosysterns. The present work aimed to propose methodologies based on the measurement of functionality and integrity spermatic biomarkers on Palaemonidae shrimps. We studied two species, an estuarine, Palaemon longirostris, and a coastal species. Palaemon serratus. due to their complementaiity on the continuum estuary-littoral ecosystem. Howevcr, crustaceans' sperm has many structuraI and functional characteristics, the number of transposable markers is limited. Thereafter, the research effort was refocused on the measurement of the DNA integrity and this inethod was evaluated for its adequacy for a biomonitoring study. We optitrtized and validate the Cornet assay for the Palaemonidae species, and the dynamic of the biological response in ternis of appearances, persistence, and possible effects on fitness was evaluated under controlled conditions in the laboratoiy. Furthermore, ex-vivo and in-vivo exposures were conducted using genotoxic models with different modes of action. On the one hand, results attested to the sensibility, the reproducibility and the integrating character of the response, on the other hand, no correlation between damaged sperm DNA and an altération of the pre-hatch stage of development was established. In paralIel, an in-situ approach was conducted to characterize the baseline level of the measured response, taking into consideration the specific constraints of each species' habitat. We were able to define a common baseline level and a threshold value for both species, highlighting the potential of the tool for inter-species transferability. This method was tested with native populations from the estuary and from the Seine Bay in 2015 and 20] 6. And, the results proved to be consistent with the contamination pressure and the hydro-sedimentary dynamics of the Seine Bay. Ultimately, the DNA integrity of sperm in Palaemonidae seems to be functional for in-situ deploytnents as a biomarker of exposure to genotoxic stress. Nevertheless, future studies should be conducted (1) to botter discern the implications of this spermatic damage on the recruitment of new cohorts and, (2) to test the transferability of the methodology to other shrimp species and on a wider geographical scale