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Registros recuperados: 19
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Amplitude of the plasma melatonin nycthemeral rhythms is not associated with the dates of onset and offset of the seasonal ovulatory activity in the Ile-de-France ewe Animal Physiology
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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Changes in the 5-­HT2 A receptor system in the pre-mammillary hypothalamus of the ewe are related to regulation of LH pulsatile secretion by an endogenous circannual rhythm Animal Physiology
Chemineau, P.; Daveau, A.; Pelletier, J.; Malpaux, B.; Karsch, F.; Viguie, C..
Background: We wanted to determine if changes in the expression of serotonin 2A receptor(5HT2 A receptor) gene in the premammillary hypothalamus are associated with changes in reproductive neuroendocrine status. Thus, we compared 2 groups of ovariectomized­estradiol­ treated ewes that expressed high vs low LH pulsatility in two different paradigms (2 groups per paradigm): (a) refractoriness (low LH secretion) or not (high LH secretion) to short days in pineal­ intact Ile­de­France ewes (RSD) and (b) endogenous circannual rhythm (ECR) in free­running pinealectomized Suffolk ewes in the active or inactive stage of their reproductive rhythm. Results: In RSD ewes, density of 5HT2 A receptor mRNA (by in situ hybridization) was significantly higher in the...
Tipo: Journal (On-line/Unpaginated) Palavras-chave: RC0321 Neuroscience. Biological psychiatry. Neuropsychiatry; QP Physiology.
Ano: 2003 URL: http://phy043.tours.inra.fr:8080/archive/00000008/
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Estacionalidad reproductiva en pequenos rumiantes: mecanismos fisiologicos y tecnicas para la induccion de una actividad sexual a cintra-estacion Animal Physiology
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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Expression of seasonality in Merinos d'Arles ewes of different genotypes at he MT1 melatonin receptor gene Inra
Teyssier, J.; Migaud, M.; Debus, N.; Maton, C.; Tillard, E.; Malpaux, B.; Chemineau, P.; Bodin, L..
Tipo: Journal Article Palavras-chave: SHEEP; SEASONALITY; OVULATORY ACTIVITY; MELATONIN RECEPTOR GENE; FEEDING LEVEL.
Ano: 2011 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD2011260aa052&uri=/notices/prodinra1/2011/02/
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Foreword - Editorial Inra
Chemineau, P.; Delouis, C.; Germain, G..
Tipo: Conference Paper Palavras-chave: CHARLES THIBAULT.
Ano: 2005 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20072d771380&uri=/notices/prodinra1/2008/03/
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Genetic parameters of spontaneous spring ovulatory activity in Merinos d'Arles sheep Inra
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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Induction of sexual activity in lactating anovulatory female goats using male goats treated only with artificially long days Animal Physiology
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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Induction of sexual activity of male creole goats in subtropical northern Mexico using long days and melatonin Animal Physiology
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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Innovations et performances environnementales en production caprine et ovine : Expertise Elevage-Environnement à l’INRA Inra
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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L'effet bouc : mode d'action et efficacité pour stimuler la reproduction des chèvres en anoestrus Inra
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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Male-induced short oestrous and ovarian cycles in sheep and goats: a working hypothesis Inra
Chemineau, P.; Pellicer-Rubio, M.T.; Lassoued, N.; Khaldi, G.; Monniaux, D..
Tipo: Conference Paper Palavras-chave: OVULATION; EFFET MALE; CORPS JAUNE; OESTRUS; CYCLE OVARIEN.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD20073b944b7e&uri=/notices/prodinra1/2008/03/
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Neuroendocrine interactions and seasonality Animal Physiology
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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Neuroendocrinologie de la reproduction chez les caprins Inra
Chemineau, P.; Delgadillo, J.A..
L’hypothalamus, par l’intermédiaire de la sécrétion du LH-RH, commande la libération épisodique des hormones gonadotropes LH et FSH dans la circulation générale. La LH n’est pas sécrétée de façon continue par l’hypohyse mais sous forme de "pulses", définis par leur fréquence et leur amplitude, qui stimulent la libération de la testostérone par le testicule chez le mâle et de l’oestradiol et de la progestérone par l’ovaire chez la femelle. La FSH est sécrétée de façon moins épisodique. Chez la chèvre, la modulation des rétroactions négatives et positives de la progestérone et de l’oestradiol sur l’axe hypothalamo-hypohysaire joue un rôle clé dans la régulation des différents événements du cycle oestrien. Une imprégnation par la progestérone n’est pas...
Tipo: Journal Article Palavras-chave: REPRODUCTION; VARIATION SAISONNIERE; LH; FSH; SYSTEME NERVEUX CENTRAL; PHOTOPERIODISME.
Ano: 1994 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB9500034106048994&uri=/notices/prodinra1/2008/02/
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Nocturnal melatonin and prolactin plasma concentrations in sheep selected for fertility in autumn lambing Animal Physiology
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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Phosphorylation of native porcine olfactory binding proteins Inra
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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Seasonal ovulatory activity exists in tropical Creole female goats and Black Belly ewes subjected to a temperature photoperiod Inra
Chemineau, P.; Daveau, A.; Cognié, Y.; Aumont, G.; Chesneau, D..
Tipo: Journal Article Palavras-chave: ACTIVITE; OVULATION.
Ano: 2004 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PUB0500018013107385&uri=/notices/prodinra1/2009/11/
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Seasonality of reproduction and production in farm fishes, birds and mammals Animal Physiology
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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Variability of plasma melatonin level in pony mares (Equus caballus), comparison with the hybrid: mules and with jennies (Equus asinus) Inra
Guillaume, D.; Zarazaga, L.A.; Malpaux, B.; Chemineau, P..
Tipo: Journal Article Palavras-chave: MULE; MELATONINE; PHOTOPERIODE; VARIABILITE GENETIQUE.
Ano: 2006 URL: http://www.prodinra.inra.fr/prodinra/pinra/doc.xsp?id=PROD200794622b76&uri=/notices/prodinra1/2008/01/
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Vingt ans de recherche et d’innovation en productions animales à l’INRA Inra
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/
Registros recuperados: 19
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