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Registro completo
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Biblioteca (s) : |
INIA Tacuarembó. |
Fecha : |
09/09/2014 |
Actualizado : |
04/02/2020 |
Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
Autor : |
CHANVALLON, A.; BLACHE, D.; CHADWICK, A.; ESMAILI, T.; HAWKEN, P.A.R.; MARTIN, G.B.; VIÑOLES, C.; FABRE-NYS, C. |
Afiliación : |
A. CHANVALLON, Centre Interrégional d’Information et de Recherche en Production Ovine, Site Expérimental du Mourier, 87800 St Priest Ligoure, FranceUMR 6175 INRA Physiologie de la Reproduction et des Comportements - CNRS - Université de Tours - Haras Nationaux, 37380; D. BLACHE, UWA Institute of Agriculture, The University of Western Australia, Crawley 6009, Perth, Australia; A. CHADWICK, UWA Institute of Agriculture, The University of Western Australia, Crawley 6009, Perth, Australia; T. ESMAILI, UWA Institute of Agriculture, The University of Western Australia, Crawley 6009, Perth, Australia; P.A.R. HAWKEN, UWA Institute of Agriculture, The University of Western Australia, Crawley 6009, Perth, Australia; G.B. MARTIN, UWA Institute of Agriculture, The University of Western Australia, Crawley 6009, Perth, Australia; CAROLINA VIÑOLES GIL, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; UWA Institute of Agriculture, The University of Western Australia, Crawley 6009, Perth, Australia; C. FABRE-NYS, UMR 6175 INRA Physiologie de la Reproduction et des Comportements - CNRS - Université de Tours - Haras Nationaux, 37380 Nouzilly, France. |
Título : |
Sexual experience and temperament affect the response of Merino ewes to the ram effect during the anoestrous season. |
Fecha de publicación : |
2010 |
Fuente / Imprenta : |
Animal Reproduction Science, 2010, v. 119, p. 205-211. |
DOI : |
10.1016/j.anireprosci.2010.02.003 |
Idioma : |
Inglés |
Notas : |
Article history: Received 26 October 2009 // Received in revised form 11 January 2010 // Accepted 4 February 2010 // Available online 11 February 2010. Corresponding author at: : Audrey.Chanvallon@tours.inra.fr // Acknowledgments: This research was supported by the Australian Research Council (Project DP0558952) and by Meat & Livestock Australia (Project MS027 ?LambMax?). We thank Steve Gray for his assistance in the care and management of the animals, and Margaret Blackberry for her assistance with the hormone assays. This work was a part of Audrey Chanvallon?s PhD project and was supported by CIFRE Convention and the ANRT. We thank also the Région Centre. |
Contenido : |
Abstract: In seasonally anoestrous ewes of many breeds, the introduction of rams triggers an increase in gonadotrophin secretion that induces ovulation, a phenomenon known as the ram effect. The ram effect is a practical method for mating ewes outside the natural breeding season, and also can provide synchronised lambing, but the variability of the response, especially in young animals, reduces its potential for widespread application. The aim of our study was to assess two factors that are thought to contribute to the variability in young ewes: temperament and sexual experience. We used anovulatory ewes from a flock that had been genetically selected for calm or nervous temperament and compared the endocrine and ovarian responses to the ram effect in four groups (each n = 15): calm and parous (3-6 years old); calm and nulliparous (2 years old); nervous and parous; and nervous and nulliparous. Parous ewes, independently of their temperament, exhibited a faster endocrine response and a higher proportion of females cycling after ram introduction than nulliparous ewes. Nervous ewes exhibited a higher proportion of females cycling after ram introduction than calm ewes, but only in the nulliparous group. We conclude that temperament exerts little influence on the response to the ram effect in sexually experienced ewes, and that females of nervous temperament appear to respond better when sexually naive. Both sexual experience and temperament need to be taken into consideration when flock management involves the ram effect. Finally, some ewes were cyclic at ram introduction, yet exhibited an increase in LH secretion even in the presence of high concentrations of progesterone. The mechanism by which the inhibitory effect of progesterone on LH secretion was bypassed needs to be clarified. MenosAbstract: In seasonally anoestrous ewes of many breeds, the introduction of rams triggers an increase in gonadotrophin secretion that induces ovulation, a phenomenon known as the ram effect. The ram effect is a practical method for mating ewes outside the natural breeding season, and also can provide synchronised lambing, but the variability of the response, especially in young animals, reduces its potential for widespread application. The aim of our study was to assess two factors that are thought to contribute to the variability in young ewes: temperament and sexual experience. We used anovulatory ewes from a flock that had been genetically selected for calm or nervous temperament and compared the endocrine and ovarian responses to the ram effect in four groups (each n = 15): calm and parous (3-6 years old); calm and nulliparous (2 years old); nervous and parous; and nervous and nulliparous. Parous ewes, independently of their temperament, exhibited a faster endocrine response and a higher proportion of females cycling after ram introduction than nulliparous ewes. Nervous ewes exhibited a higher proportion of females cycling after ram introduction than calm ewes, but only in the nulliparous group. We conclude that temperament exerts little influence on the response to the ram effect in sexually experienced ewes, and that females of nervous temperament appear to respond better when sexually naive. Both sexual experience and temperament need to be taken into consideration wh... Presentar Todo |
Palabras claves : |
CYCLICITY; EXPERIENCE; MALE EFFECT; REPRODUCCIÓN; SHEEP; TEMPERAMENT. |
Thesagro : |
OVINOS. |
Asunto categoría : |
L01 Ganadería |
Marc : |
LEADER 03332naa a2200313 a 4500 001 1050084 005 2020-02-04 008 2010 bl uuuu u00u1 u #d 024 7 $a10.1016/j.anireprosci.2010.02.003$2DOI 100 1 $aCHANVALLON, A. 245 $aSexual experience and temperament affect the response of Merino ewes to the ram effect during the anoestrous season. 260 $c2010 500 $aArticle history: Received 26 October 2009 // Received in revised form 11 January 2010 // Accepted 4 February 2010 // Available online 11 February 2010. Corresponding author at: : Audrey.Chanvallon@tours.inra.fr // Acknowledgments: This research was supported by the Australian Research Council (Project DP0558952) and by Meat & Livestock Australia (Project MS027 ?LambMax?). We thank Steve Gray for his assistance in the care and management of the animals, and Margaret Blackberry for her assistance with the hormone assays. This work was a part of Audrey Chanvallon?s PhD project and was supported by CIFRE Convention and the ANRT. We thank also the Région Centre. 520 $aAbstract: In seasonally anoestrous ewes of many breeds, the introduction of rams triggers an increase in gonadotrophin secretion that induces ovulation, a phenomenon known as the ram effect. The ram effect is a practical method for mating ewes outside the natural breeding season, and also can provide synchronised lambing, but the variability of the response, especially in young animals, reduces its potential for widespread application. The aim of our study was to assess two factors that are thought to contribute to the variability in young ewes: temperament and sexual experience. We used anovulatory ewes from a flock that had been genetically selected for calm or nervous temperament and compared the endocrine and ovarian responses to the ram effect in four groups (each n = 15): calm and parous (3-6 years old); calm and nulliparous (2 years old); nervous and parous; and nervous and nulliparous. Parous ewes, independently of their temperament, exhibited a faster endocrine response and a higher proportion of females cycling after ram introduction than nulliparous ewes. Nervous ewes exhibited a higher proportion of females cycling after ram introduction than calm ewes, but only in the nulliparous group. We conclude that temperament exerts little influence on the response to the ram effect in sexually experienced ewes, and that females of nervous temperament appear to respond better when sexually naive. Both sexual experience and temperament need to be taken into consideration when flock management involves the ram effect. Finally, some ewes were cyclic at ram introduction, yet exhibited an increase in LH secretion even in the presence of high concentrations of progesterone. The mechanism by which the inhibitory effect of progesterone on LH secretion was bypassed needs to be clarified. 650 $aOVINOS 653 $aCYCLICITY 653 $aEXPERIENCE 653 $aMALE EFFECT 653 $aREPRODUCCIÓN 653 $aSHEEP 653 $aTEMPERAMENT 700 1 $aBLACHE, D. 700 1 $aCHADWICK, A. 700 1 $aESMAILI, T. 700 1 $aHAWKEN, P.A.R. 700 1 $aMARTIN, G.B. 700 1 $aVIÑOLES, C. 700 1 $aFABRE-NYS, C. 773 $tAnimal Reproduction Science, 2010$gv. 119, p. 205-211.
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Registro original : |
INIA Tacuarembó (TBO) |
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Registro completo
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Biblioteca (s) : |
INIA Las Brujas. |
Fecha actual : |
12/04/2017 |
Actualizado : |
11/12/2023 |
Tipo de producción científica : |
Artículos en Revistas Agropecuarias |
Autor : |
DUPLEX COMUNICACIÓN (DX); INIA (INSTITUTO NACIONAL DE INVESTIGACIÓN AGROPECUARIA); UNIVERSIDAD DE LA EMPRESA (UDE); EDUCATION FIRST (EF); REVISTA DE LA ARU (ASOCIACIÓN RURAL DEL URUGUAY) |
Título : |
El campo: una opción de futuro?. I Jornadas. |
Fecha de publicación : |
2016 |
Fuente / Imprenta : |
Revista Ganadería (ARU), 2016, v.144 (166), p. 8-12. |
Descripción física : |
Edición especial Ecos Prado 2016. |
Idioma : |
Español |
Notas : |
Más de 600 estudiantes se reunieron para escuchar hablar de campo en la Expo Prado |
Contenido : |
Más de 600 estudiantes se reunieron para escuchar hablar de campo en la Expo Rural. -- Coordinación de las Charlas: Ing. Agr. (Mag.) Raúl Gómez Miller - Encargado de la Unidad de Comunicación y Transferencia de Tecnología de INIA.
Disertantes por INIA: Ganadería: Ing. Agr. MSc. Horacio Saravia Díaz. -- Forestal: Ing. Roberto Scoz. -- Agricultura: Ing. Agr. MSc. Ernesto Restaino Galup. |
Palabras claves : |
CHARLAS A ESTUDIANTES; EXPO PRADO 2016. |
Thesagro : |
CAMPO; COMUNICACIÓN; DIFUSION DE INFORMACION. |
Asunto categoría : |
C20 Extensión |
URL : |
http://www.ainfo.inia.uy/digital/bitstream/item/17434/1/Rev.GR-ARU-2016-El-campo-una-opcion-de-futuro.pdf
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Marc : |
LEADER 01289naa a2200253 a 4500 001 1057017 005 2023-12-11 008 2016 bl uuuu u00u1 u #d 100 1 $aDUPLEX COMUNICACIÓN (DX) 245 $aEl campo$buna opción de futuro?. I Jornadas.$h[electronic resource] 260 $c2016 300 $cEdición especial Ecos Prado 2016. 500 $aMás de 600 estudiantes se reunieron para escuchar hablar de campo en la Expo Prado 520 $aMás de 600 estudiantes se reunieron para escuchar hablar de campo en la Expo Rural. -- Coordinación de las Charlas: Ing. Agr. (Mag.) Raúl Gómez Miller - Encargado de la Unidad de Comunicación y Transferencia de Tecnología de INIA. Disertantes por INIA: Ganadería: Ing. Agr. MSc. Horacio Saravia Díaz. -- Forestal: Ing. Roberto Scoz. -- Agricultura: Ing. Agr. MSc. Ernesto Restaino Galup. 650 $aCAMPO 650 $aCOMUNICACIÓN 650 $aDIFUSION DE INFORMACION 653 $aCHARLAS A ESTUDIANTES 653 $aEXPO PRADO 2016 700 1 $aINIA (INSTITUTO NACIONAL DE INVESTIGACIÓN AGROPECUARIA) 700 1 $aUNIVERSIDAD DE LA EMPRESA (UDE) 700 1 $aEDUCATION FIRST (EF) 700 1 $aREVISTA DE LA ARU (ASOCIACIÓN RURAL DEL URUGUAY) 773 $tRevista Ganadería (ARU), 2016$gv.144 (166), p. 8-12.
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