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| Registros recuperados: 299 | |
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| Val-Laillet, D.; Simon, M.; Nowak, R.. |
| The establishment of filial bonding in sheep relies on the success of the first suckling bouts. Previous work has shown that colostrum ingestion facilitates the development of a preference for the mother. We conducted a series of experiments to investigate the influence of quantitative and qualitative factors linked to fluid ingestion. The first experiment demonstrated that the procedure was not detrimental to the mother-young interaction and did not cause any harm to the lamb. In a second experiment, lambs could interact with their dam but were deprived of suckling during the first 12h after birth (the udder was covered) and fed via a nasogastric tube in the presence of their mother on seven occasions. When tested in a two-choice test at 12h of age, lambs... |
| Tipo: Journal (Paginated) |
Palavras-chave: QP Physiology. |
| Ano: 2004 |
URL: http://phy043.tours.inra.fr:8080/archive/00000050/ |
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| Jalabert, B.; Breton, B.; Brzuska, E.; Fostier, A.; Wieniawski, J.. |
| The efficiency of different hormonal treatments to induce ovulation of carp at low temperatures (13-15°C) was tested. "Priming" with a low dose (0.6 mg/kg) of carp pituitary extract was found necessary for a subsequent successful treatment with 17alpha-hydroxy-20beta-dihydroprogesterone (17alpha-20beta P) (2 mg/kg) 1 day later. The eggs produced by this method showed satisfactory fertilization (75-96%) and hatching success (70%). On the other hand, normal hypophysation (5.4 mg/kg) following priming resulted only in partial ovulation and oocyte resorption at this temperature. Priming was shown to increase the gonadotropin level in plasma from about 2 to 35 ng/ml and to induce germinal vesicle migration toward the periphery of oocytes. Neither... |
| Tipo: Journal (Paginated) |
Palavras-chave: QP Physiology. |
| Ano: 1977 |
URL: http://phy043.tours.inra.fr:8080/archive/00000195/ |
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| Dumont, E.; Rallière, C.; Tabet, K.C.; Rescan, P.Y.. |
| NLRR-l (neuronal leucine-rich repeat-l) is a transmembrane protein that functions as a cell adhesion molecule regulating morphogenesis. Previous study in the mouse reported that somitic expression of NLRR-1 is restricted to the dorsal lip of the dermomyotome that gives rise to the epaxial muscle. Here we report the expression of a NLRR-1 gene in the trout developing somite. Whole mount in situ hybridisation showed that NLRR-l transcript accumulated in a rostro-caudal wave in the adaxial slow muscle cells that are initially found deep in the somite, immediately adjacent to the notochord. No labelling was observed in the segmental plate from which somites form. As somites mature along an anteroposterior axis the NLRR-l-positive adaxial cells exhibited an... |
| Tipo: Journal (Paginated) |
Palavras-chave: QP Physiology. |
| Ano: 2007 |
URL: http://phy043.tours.inra.fr:8080/archive/00000400/ |
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| Breton, B.. |
| Urea (8 M) treatment of salmon gonadotropin results in the dissociation of the hormone into two subunits. These subunits were separated using DEAE-cellulose chromatography and gel filtration on Ultrogel ACA 54, and studied for their molecular weights, electrophoretic, biological, and immunological properties. Molecular weights of the alpha and beta subunits were, respectively, 12,500 and 17,000 as determined by gel filtration and sodium dodecyl sulfate-gel electrophoresis. In anionic polyacrylamide gel electrophoresis, 7.5%, the alpha subunit, migrated more rapidly (Rf = 0.67) than the native hormone s-GtH (Rf = 0.38), and the beta subunit did not migrate. The biological activities of the alpha and beta subunits were less than 10% of the GtH. Reassociation... |
| Tipo: Journal (Paginated) |
Palavras-chave: QP Physiology. |
| Ano: 1981 |
URL: http://phy043.tours.inra.fr:8080/archive/00000371/ |
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| Skipor, J.; Wasowska, B.; Picard, S.; Thiery, J.C.. |
| In female sheep, estradiol-dependent dopaminergic inhibition exerted by the A15 nucleus during long days (LD) results in a blockade of reproductive activity. This effect could involve the GnRH cell bodies or their terminals in the median eminence(ME). However, a vast majority of terminals of the A15 nucleus are located in neurohypophysis and only a few in the ME. Previously we demonstrated that tritiated dopamine (DA) was transfered from the venous blood of the cavernous sinus to the arterial blood supplying the brain. In the present paper, we tested the hypothesis that the transferred dopamine could reach further the brain and ME. Using isolated sheep heads harvested on short days vs. long days, we examined radioactivity in brain tissues following... |
| Tipo: Journal (Paginated) |
Palavras-chave: QP Physiology. |
| Ano: 2004 |
URL: http://phy043.tours.inra.fr:8080/archive/00000046/ |
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| Skipor, J.; Wasowska, B.; Picard, S.; Thiery, J.C.. |
| In female sheep, estradiol-dependent dopaminergic inhibition exerted by the A15 nucleus during long days (LD) results in a blockade of reproductive activity. This effect could involve the GnRH cell bodies or their terminals in the median eminence(ME). However, a vast majority of terminals of the A15 nucleus are located in neurohypophysis and only a few in the ME. Previously we demonstrated that tritiated dopamine (DA) was transfered from the venous blood of the cavernous sinus to the arterial blood supplying the brain. In the present paper, we tested the hypothesis that the transferred dopamine could reach further the brain and ME. Using isolated sheep heads harvested on short days vs. long days, we examined radioactivity in brain tissues following... |
| Tipo: Journal (Paginated) |
Palavras-chave: QP Physiology. |
| Ano: 2004 |
URL: http://phy043.tours.inra.fr:8080/archive/00000169/ |
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| Jalabert, B.; Bry, C.; Breton, B.; Campbell, C.. |
| La 17 alpha hydroxy-20 beta dihydroprogestérone injectée (2 mg/kg) à des femelles dont les ovocytes sont au stade de la « vésicule germinative semi-périphérique » permet d'obtenir un groupement des ovulations entre 5 et 9 jours après le traitement. Au cours des premiers stades de la maturation ainsi déclenchée, l'augmentation de la t-GtH est inférieure à celle des témoins, accréditant l'hypothèse d'une action directe sur les ovocytes. L'action de la progestérone est moins efficace. |
| Tipo: Journal (Paginated) |
Palavras-chave: QP Physiology. |
| Ano: 1976 |
URL: http://phy043.tours.inra.fr:8080/archive/00000213/ |
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| Guillaume, D.. |
| Photoperiod action on equine reproduction. Mares and stallions have their reproductive period during the season where the days are long. This annual reproductive rhythm is controlled by the length of the daylight. Treatment of mares during winter when their ovaries are normally inactive, with an artificial light during 14.5 h per day, beginning around the winter solstice, causes the first ovulation of the year to occur at an earlier date. Studies have verified certain stages in the process by which equine species perceive light. The light message is transformed into nerve impulse by specialized retinal cells. These impulses are transmitted through the suprachiasmatic nucleus and the cervical superior nucleus to the pineal gland. The pinealocytes respond to... |
| Tipo: Journal (Paginated) |
Palavras-chave: QP Physiology. |
| Ano: 1996 |
URL: http://phy043.tours.inra.fr:8080/archive/00000013/ |
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| Zarazaga, L. A.; Malpaux, B.; Chemineau, P.. |
| We investigated if absolute (nocturnal) or relative (ratio nocturnal/diurnal) plasma melatonin concentrations were associated with the seasonal ovulatory activity in Ile-de-France ewes. Ninety-six and 121 ewes in two different groups of the same flock were used to determine the potential existence of a relationship between melatonin concentrations at the summer and winter solstices, and the dates of onset and offset of the ovulatory activity, respectively. Dates of the first and last ovulations were estimated by assaying progesterone in plasma samples taken once weekly. Mean ± SEM (1) plasma melatonin concentrations at the summer solstice and at the winter solstice were 302.4 ± 19.4 and 412.0 ± 18.7 pg/ml, respectively, (2) date of onset of the breeding... |
| Tipo: Journal (Paginated) |
Palavras-chave: QH426 Genetics; QP Physiology. |
| Ano: 2003 |
URL: http://phy043.tours.inra.fr:8080/archive/00000031/ |
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| Chourrout, D.; Chevassus, B.; Herioux, F.. |
| In this work, we tried to optimize gamma-treatment of sperm to obtain large numbers of haploid gynogenetic embryos after fertilization. The analysis of increasing doses showed a typical Hertwig effect in all cases, but we found wide between-male variations in the most efficient dose. This variability was reduced by mixing several irradiated samples collected from different males or given different efficient doses. [Au cours de ce travail, nous avons cherché à optimiser le traitement du sperme aux rayons gamma dans le but d'obtenir après insémination des taux élevés de développements gynogénétiques haploïdes. L'analyse de doses croissantes a montré un effet Hertwig typique dans tous les cas, mais nous avons enregistré pour la dose optimale d'importantes... |
| Tipo: Journal (Paginated) |
Palavras-chave: QP Physiology. |
| Ano: 1980 |
URL: http://phy043.tours.inra.fr:8080/archive/00000335/ |
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| Gerard, N.; Loiseau, S.; Duchamp, G.; Seguin, F.. |
| Follicular development and ovulatory process in mammals involve local biochemical changes as a result of substantial modifications in cellular metabolism,the most well known of which is steroid variation. In the present study, we studied the intrafollicular variation of several other components, by using proton nuclear magnetic resonance ( 1 H NMR). This approach made it possible to demonstrate that the intrafollicular biochemical content changes during follicular growth and maturation. We aspirated follicular fluid by ovarian puncture of the dominant follicle at various physiological stages of its development : early dominant, late dominant and preovulatory. Serum samples were collected during each puncture session. Protonnuclear magnetic resonance... |
| Tipo: Journal (Paginated) |
Palavras-chave: RG Gynecology and obstetrics; QP Physiology. |
| Ano: 2002 |
URL: http://phy043.tours.inra.fr:8080/archive/00000006/ |
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| Baron, D.; Fostier, A.; Breton, B.; Guiguen, Y.. |
| Recent investigations have shown that estrogens have profound inhibitory effects on steroidogenic enzyme gene expressions before and after testicular differentiation in the rainbow trout, Oncorhynchus mykiss. This present study bring new data on juvenile rainbow trout treated with estrogens and androgens. Following a 8 days oral treatment of juvenile male with 17-ethynyl-estradiol (EE2, 20 mg/kg diet) or 11-hydroxyandrostenedione (11OH4, 10 mg/kg diet), we observed a fast and marked decrease of steady-state mRNA levels for 3HSD, P450scc, P450c17, and P450c11 enzymes in the testis. After completion of these treatments, mRNA levels of these enzymes remained low in EE2 treated males whereas in 11OH4 treated males they recovered their initial levels in 8 days.... |
| Tipo: Journal (Paginated) |
Palavras-chave: QP Physiology. |
| Ano: 2005 |
URL: http://phy043.tours.inra.fr:8080/archive/00000087/ |
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| Billard, R.; Ploye, H.. |
| La galvanonarcose de poissons d'aquarium tels que Xiphophores, Gambusies et Lebistes dans un champ électrique constitue un moyen d'immobilization. [A magnetic field can be used as a means of immobilization (galvanonarcosis) of aquarium fishes like Xiphophorus, Gambusia and Lebistes. The alternating current is rectified by means of a silicon diod and the outfit diagrammatized in the text functions as a potential regulator. The value of the gradient of the electric field inducing galvanonarcosis alters in respect with the length of fishes.] |
| Tipo: Journal (Paginated) |
Palavras-chave: QP Physiology. |
| Ano: 1966 |
URL: http://phy043.tours.inra.fr:8080/archive/00000104/ |
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| Billard, R.. |
| Dans les pays industrialisés, l'écosystème aquatique n'a été pris en charge par aucun corps professionnel structuré, et souvent par aucune Administration spécifique. Les milieux aquatiques se sont progressivement dégradés du point de vue biologique ; l'eau n'est en fait considérée que comme un élément physique destiné à la boisson, l'irrigation, la navigation, la production d'énergie et l'élimination des déchets les plus divers. Dans les pays asiatiques, l'écosystème aquatique a été intégré à l'écosystème agricole ; il assure une production importante de protéines, à partir de la production naturelle du milieu, permet le recyclage des déchets, assure une protection de l'écosystème agricole, dont il garantit la pérennité et permet la mise en valeur de... |
| Tipo: Journal (Paginated) |
Palavras-chave: QP Physiology. |
| Ano: 1980 |
URL: http://phy043.tours.inra.fr:8080/archive/00000316/ |
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| Briant, C.; Otogalli, M.; Guillaume, D.. |
| With the objective of controlling the day of ovulation, 40 mares were assigned to a control or 3 treated groups: A3d, A4d and A5d. The treated groups received antarelix (TeverelixTM 0.01 mg/kg IV twice a day) for 3, 4 or 5 days from the day the dominant follicle (F1) reached 28 mm (=D0), and one injection of hCG (1600 UI IV) on D1, D2 or D3 respectively. Control mares received one injection of hCG when F1 reached 35 mm. Plasma LH, FSH, progesterone and total estrogens were assayed. In the A3d, A4d and A5d groups, 9 (90%), 6 (60%) and 5 (50%) out of 10 mares respectively ovulated on the expected day (i.e. between 24 and 48 hours after hCG injection). In the control group, 7/10 (70%) presented the typical response to hCG. For 3 mares in both the A4d and A5d... |
| Tipo: Journal (Paginated) |
Palavras-chave: QP Physiology. |
| Ano: 2004 |
URL: http://phy043.tours.inra.fr:8080/archive/00000064/ |
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| Registros recuperados: 299 | |
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