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Biblioteca (s) : |
INIA Tacuarembó. |
Fecha : |
21/02/2014 |
Actualizado : |
21/09/2017 |
Autor : |
PARAGUAY. MINISTERIO DE AGRICULTURA Y GANADERÍA. |
Título : |
Informe Anual 1978. |
Fecha de publicación : |
1979 |
Fuente / Imprenta : |
Asunción (Paraguay): PRONIEGA, 1979. |
Páginas : |
76 p. |
Idioma : |
Español |
Contenido : |
Destete sobre pradera natural y pradera de Setaria suplementados con expeller y ensilado. Barrerito. Evaluación de sistemas de utilización de pasturas: pastoreo combinado de pradera natural con diferentes cargas suplementado con pradera cultivada. Efecto de pastoreo sobre pradera artificial en periodo de preparto, parto y postparto en la reproducción de vacas sobre pradera natural. Inccidencia estacional e identificación de garrapatas del ganado vacuno en la Estación Experimental del Chaco y Barrerito. Estudio comparativo de suplementos nitrogenados proteicos y no proteicos (UREA) sobre bovinos en crecimiento - San Lorenzo. Estudio sobre verrugas en ganado bovino - San Lorenzo. Efecto de diferentes frecuencias de cortes en el rendimiento de la pradera natural y tres pastos cultivados. |
Thesagro : |
APLICACION DE ABONOS; ENFERMEDADES DE LOS ANIMALES; ESCARDA; GANADERIA; GANADO BOVINO; PARAGUAY; PASTIZAL NATURAL; PASTURAS NATURALES; PLANTAS FORRAJERAS; PROYECTOS DE DESARROLLO; SORGHUM BICOLOR; VARIEDADES. |
Asunto categoría : |
L01 Ganadería |
Marc : |
LEADER 01505nam a2200265 a 4500 001 1015919 005 2017-09-21 008 1979 bl uuuu u00u1 u #d 100 1 $aPARAGUAY. MINISTERIO DE AGRICULTURA Y GANADERÍA. 245 $aInforme Anual 1978. 260 $aAsunción (Paraguay): PRONIEGA$c1979 300 $a76 p. 520 $aDestete sobre pradera natural y pradera de Setaria suplementados con expeller y ensilado. Barrerito. Evaluación de sistemas de utilización de pasturas: pastoreo combinado de pradera natural con diferentes cargas suplementado con pradera cultivada. Efecto de pastoreo sobre pradera artificial en periodo de preparto, parto y postparto en la reproducción de vacas sobre pradera natural. Inccidencia estacional e identificación de garrapatas del ganado vacuno en la Estación Experimental del Chaco y Barrerito. Estudio comparativo de suplementos nitrogenados proteicos y no proteicos (UREA) sobre bovinos en crecimiento - San Lorenzo. Estudio sobre verrugas en ganado bovino - San Lorenzo. Efecto de diferentes frecuencias de cortes en el rendimiento de la pradera natural y tres pastos cultivados. 650 $aAPLICACION DE ABONOS 650 $aENFERMEDADES DE LOS ANIMALES 650 $aESCARDA 650 $aGANADERIA 650 $aGANADO BOVINO 650 $aPARAGUAY 650 $aPASTIZAL NATURAL 650 $aPASTURAS NATURALES 650 $aPLANTAS FORRAJERAS 650 $aPROYECTOS DE DESARROLLO 650 $aSORGHUM BICOLOR 650 $aVARIEDADES
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Registro completo
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Biblioteca (s) : |
INIA Tacuarembó. |
Fecha actual : |
09/09/2014 |
Actualizado : |
04/02/2020 |
Tipo de producción científica : |
Artículos en Revistas Indexadas Internacionales |
Circulación / Nivel : |
Internacional - -- |
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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