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| Registros recuperados: 19 | |
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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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| Chemineau, P.; Morello, H.; Delgadillo, J.A.; Malpaux, B.. |
| Resumen Los pequeños rumiantes presentan, como sus ancestros salvajes, un período de reposo sexual estacional de duración e intensidad variable entre razas. Ambos sexos tienen una actividad sexual (espermatogénesis en el macho y actividades ovulatoria y estral en la hembra) mínima en primavera y verano y máxima en otoño e invierno. Esta estacionalidad resulta de una combinación, aún mal conocida, entre un ritmo endógeno circanual y la interpretación por el sistema nervioso central de la duración de la noche, vía la secreción de melatonina de origen pineal. Los tratamientos « fotoperiódicos »están apoyados sobre principios simples : alternancia entre fotoperíodos, iluminación de la fase fotosensible, utilización de melatonina para días cortos... |
| Tipo: Conference Paper |
Palavras-chave: QP Physiology. |
| Ano: 2003 |
URL: http://phy043.tours.inra.fr:8080/archive/00000029/ |
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| Hanocq, E.; Bodin, L.; Thimonier, J.; Teyssier, J.; Malpaux, B.; Chemineau, P.. |
| Les paramètres génétiques de l’activité ovulatoire spontanée au printemps ont été estimés en race Mérinos d’Arles dans le système d’élevage pastoral traditionnel (transhumance estivale) du sud-est de la France. Le dosage de la progestérone plasmatique dans deux prélèvements sanguins effectués à 8-10 j d’intervalle a permis de déterminer l’activité ovulatoire des brebis. 1887 performances d’activité ovulatoire ont été enregistrées en 1995, 1996 et 1997, sur 933 brebis issues de 176 béliers. Le «statut physiologique » (antenaises, brebis adultes avec ou sans mise bas à l’automne précédent), l’âge et le poids au moment de la lutte des brebis ont des effets très significatifs sur l’activité ovulatoire. Ils ont été pris en compte dans le modèle animal... |
| Tipo: Journal Article |
Palavras-chave: SAISONNEMENT; RACE OVINE MERINOS D'ARLES; REPRODUCTION; PARAMETRE GENETIQUE; OVULATION; SELECTION. |
| Ano: 1999 |
URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB9900007841075963&uri=/notices/prodinra1/2007/07/ |
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| Delgadillo, J.A.; Flores, J.A.; Veliz, F. G.; Hernandez, H. F.; Duarte, G.; Vielma, J.; Poindron, P.; Chemineau, P.; Malpaux, B.. |
| Two experiments were conducted to determine the response of Creole male goats treated with long days and melatonin implants, and the response of the anovulatory does to male effect using males treated only with artificially long days. All animals were allocated to open sheds. In Exp. 1, one group of males was under natural photoperiod (CG; n = 7); the second group was submitted to 2.5 mo of long days followed by the insertion of two s.c. melatonin implants (LD+MEL; n =7); the third group was subjected only to 2.5 mo of long days (LD; n = 7). Testicular weight was measured every 2 wk. Plasma testosterone concentrations were determined weekly. A treatment × time interaction was detected (P < 0.001) for testicular weight and plasma testosterone... |
| Tipo: Journal (Paginated) |
Palavras-chave: QP Physiology. |
| Ano: 2002 |
URL: http://phy043.tours.inra.fr:8080/archive/00000009/ |
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| Delgadillo, J.A.; Carillo, E.; Moran, J.; Duarte, G.; Chemineau, P.; Malpaux, B.. |
| The aim of this study was to determine whether the sexual activity of local male Creole goats in subtropical Mexico can be induced during the non breeding season by a longday treatment followed by insertion of two melatonin implants. The experiment was carried out in the Laguna region in the State of Coahuila, Mexico (26°N). Fourteen male goats were allocated to two balanced groups (n = 7 each) according to body and testicular weights. Males were kept together in two separate groups and fed lucerne hay for ad libitum intake and 300 g of commercial concentrate and had free access to water and mineral blocks. The control group remained in open sheds under natural photoperiod and ambient temperature conditions. The experimental group was placed in a... |
| Tipo: Journal (Paginated) |
Palavras-chave: QP Physiology. |
| Ano: 2001 |
URL: http://phy043.tours.inra.fr:8080/archive/00000011/ |
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| Bocquier, F.; Benoit, M.; Laignel, G.; Dedieu, B.; Cournut, S.; Fiorelli, C.; Jouven, M.; Moulin, C.H.; Aubron, C.; Lurette, A.; Lapeyronie, P.; Hassoun, P.; Meuret, M.; Agreil, C.; Napoleone, M.; Hoste, H.; Friggens, N.; Tichit, M.; Gonzalez Garcia, E.; Hazard, D.; François, D.; Pellicer Rubio, M.; Guillouet, P.; Boissard, K.; Fabre-Nys, C.; Debus, N.; Teyssier, J.; Tournadre, H.; Migaud, M.; Malpaux, B.; Chemineau, P.; Bodin, L.; Prache, S.; Bouix, J.; Barillet, F.; Boutonnet, J.P.; Chia, E.; Lasseur, J.; Etienne, M.; Gibon, A.; Choisis, J.P.; Labatut, J.; Paoli, J.C.; Santucci, P.. |
| Les systèmes d’élevage ovins et les caprins, comme les autres productions animales, sont confrontés aux multiples défis environnementaux : limiter les nuisances et contribuer positivement à l’entretien ou à l’amélioration du milieu. Les travaux de l’INRA, et de ses partenaires, se sont largement impliqués dans ces questions en considérant ces élevages de petits ruminants comme faisant partie d‘agroécosystèmes complexes. Cette synthèse collective rassemble, en privilégiant les niveaux d’approche, les actions dans lesquels l’INRA intervient. Considérant tout d’abord les grandes tendances sur les effectifs d’animaux et leur répartition géographique, les adaptations ou les disparitions de ces élevages se repèrent par les approches technico-économiques. Dans ce... |
| Tipo: Journal Article |
Palavras-chave: SHEEP; GOAT; SMALL-RUMINANT; MEAT PRODUCTION; DAIRY PRODUCTS; FARMING SYSTEM; ORGANIC FARMING; CONCENTRATE; FERTILIZERS; HORMONES; SEASONAL BREEDING; GRAZING; NATURAL PASTURES; RANGELANDS; PASTORAL RESOURCE; SYLVO-PASTORAL; TRANSHUMANCE; SOIL FERTILITY; BIODIVERSITY; ECOSYSTEMIC SERVICE; GLOBAL EFFICIENCY; GREENHOUSE GAS; TERRITORIES; LANDSCAPE; LABOUR; INNOVATION; INVENTION TRANSFER; ANIMAL SELECTION; PRECISION FARMING; ECOLOGICAL INTENSIFICATION; MULTIDISCIPLINARY RESEARCH.. |
| Ano: 2011 |
URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD201176bcaa27&uri=/notices/prodinra1/2011/04/ |
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| Chemineau, P.. |
| L’introduction du bouc, après une séparation complète (odeur, vue, son, toucher), dans un groupe de chèvres en anoestrus provoque l’apparition d’ovulations synchrones dans les jours qui suivent (en moyenne 2,5 jours). Le contact avec le mâle provoque, chez la femelle, une augmentation immédiate du nombre et de l’amplitude des pulses de LH induisant l’apparition d’un pic préovulatoire qui va déclencher l’ovulation. Cette ovulation induite est accompagnée d’un comportement d’oestrus dans 60 % des cas et est suivie d’un corps jaune de courte durée (5 jours) dans 75 % des cas. A la suite de ce cycle court, la cyclicité ovarienne et le comportement d’oestrus sont rétablis. La qualité de la stimulation par le mâle inducteur est importante pour la réussite de l’«... |
| Tipo: Journal Article |
Palavras-chave: MISE BAS; STIMULATION SEXUELLE; CYCLE OVARIEN; REPRODUCTION; MALE; LH; OESTRUS; ANOESTRUS. |
| Ano: 1989 |
URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB9100009677019320&uri=/notices/prodinra1/2008/06/ |
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| Thiery, J.C.; Chemineau, P.; Hernandez, X.; Migaud, M.; Malpaux, B.. |
| Abstract Sheep in temperate latitudes are seasonal breeders. Of the different seasonal cues, photoperiod is the most reliable parameter and is used by animals as an indication of the time of the year to synchronize endogenous annual rhythms of reproduction and physiology. The photoperiodic information is transduced into neuroendocrine changes through variations in melatonin secretion from the pineal gland. Melatonin triggers variations in the secretion of luteinizing hormone-releasing hormone, luteinizing hormone and follicle stimulating hormone (LHRH/LH/FSH) responsible for seasonal changes in reproductive activity. In female sheep, the seasonal changes in the hormonal LH pattern mainly reflect an increase in the negative feedback exerted by estradiol... |
| Tipo: Journal (Paginated) |
Palavras-chave: QP Physiology. |
| Ano: 2002 |
URL: http://phy043.tours.inra.fr:8080/archive/00000045/ |
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| Notter, D. R.; Chemineau, P.. |
| Ewes selected for fertility in autumn lambing were used to evaluate correlated responses in nocturnal hormone levels. Four jugular blood samples were obtained during nighttime in August from each of 113 selected and 69 control ewes. Melatonin levels were lower for selected ewes (143 ± 14 pg/mL) than for control ewes (184 ± 13 pg/mL), and melatonin levels decreased with increases in estimated breeding values (EBV) for fertility (-2.23 ± 0.79 pg#mL -1 #% -1 ). Prolactin levels were higher for selected ewes (90 ± 7 ng/mL) than for control ewes (52 ± 7 ng/mL), but significant line × ewe age interaction was also observed, with smaller differences in prolactin levels in 2yrold and older ewes (74 ± 7vs56± 9 ng/mL for select and control ewes, respectively; P... |
| Tipo: Journal (Paginated) |
Palavras-chave: QP Physiology. |
| Ano: 2001 |
URL: http://phy043.tours.inra.fr:8080/archive/00000010/ |
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| Nagnan-Le Meillour, P.; Le Danvic, C.; Brimau, F.; Chemineau, P.; Michalski, J.C.. |
| The identification of various isoforms of olfactory binding proteins is of major importance to elucidate their involvement in detection of pheromones and other odors. Here, we report the characterization of the phosphorylation of OBP (odorant binding protein) and Von Ebner’s gland protein (VEG) from the pig, Sus scrofa. After labeling with specific antibodies raised against the three types of phosphorylation (Ser, Thr, Tyr), the phosphate-modified residues were mapped by using the beta-elimination followed by Michael addition of dithiothreitol (BEMAD) method. Eleven phosphorylation sites were localized in the pOBP sequence and nine sites in the VEG sequence. OBPs are secreted by Bowman’s gland cells in the extracellular mucus lining the nasal cavity. After... |
| Tipo: Journal Article |
Palavras-chave: WESTERN BLOT; SPECTROMETRIE DE MASSE MALDI TOF; BEMAD; GEL DE POLYACRYLAMIDE. |
| Ano: 2009 |
URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20093ae177c1&uri=/notices/prodinra1/2010/11/ |
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| Chemineau, P.; Malpaux, B.; Brillard, J.P.; Fostier, A.. |
| A very large majority of farm animals express seasonal variations in their production traits, thus inducing seasonal availability of fresh derived animal products (meat, milk, cheese and eggs). This pattern is in part the consequence of the farmer’s objective to market his products in the most economically favourable period. It may also be imposed by the season-dependent access to feed resources, as in ruminants, or by the specific requirements derived from adaptation to environmental conditions such as water temperature in fish. But seasonal variations in animal products are also the consequence of constraints resulting from the occurrence of a more or less marked seasonal reproductive season in most farm animal species including fish, poultry and... |
| Tipo: Journal (Paginated) |
Palavras-chave: QP Physiology. |
| Ano: 2007 |
URL: http://phy043.tours.inra.fr:8080/archive/00000396/ |
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| Charley, B.; Chemineau, P.; Boichard, D.; Meynard, J.M.; Aumont, G.; Herpin, P.. |
| A l’occasion de son 20ème anniversaire, la revue INRA Productions Animales a décidé de publier un numéro spécial sur « 20 ans de recherches en productions animales à l’INRA ». Son objectif est de retracer, à travers quelques exemples significatifs, des résultats scientifiques majeurs de l’INRA en productions animales, qui ont déjà pour la plupart un impact avéré en élevage. Les avancées spectaculaires de la biologie et des approches systémiques au cours des dernières décennies, tant conceptuelles que méthodologiques, ont eu de très nombreuses répercussions sur les recherches en productions animales, qu’il serait impossible de détailler de façon exhaustive dans le cadre de ce seul numéro. C’est pourquoi nous avons choisi de présenter à grands traits... |
| Tipo: Journal Article |
Palavras-chave: PRODUCTION ANIMALE; VARIABILITE GENETIQUE; ANIMAL D' ELEVAGE; GENETIQUE DE L'ANIMAL D'ELEVAGE; BIOTECHNOLOGIE DE LA REPRODUCTION; CONDUITE DE TROUPEAU; SECURITE SANITAIRE DES ALIMENTS; MAITRISE DE LA REPRODUCTION ANIMALE; QUALITE DES PRODUITS; STATUT DE L'ANIMAL; IMPACT ENVIRONNEMENTAL DE L'ELEVAGE; AMENITE ENVIRONNEMENTALE DE L'ELEVAGE; PHYSIOLOGIE DU COMPORTEMENT; PHYSIOLOGIE DE LA REPRODUCTION; GENETIQUE QUANTITATIVE; GENETIQUE APPLIQUEE. |
| Ano: 2008 |
URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200898f89048&uri=/notices/prodinra1/2010/06/ |
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| Registros recuperados: 19 | |
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