Fecha/hora: 12/06/2024 04:22:45

Biblioteca(s): 	INIA La Estanzuela; INIA Las Brujas.	
Tipo de la producción científica: 	Artículos en Revistas Indexadas Internacionales	
Circulación/Nivel: 	Internacional - --	
Fecha corriente: 	14/11/2015	
Fecha de la última actualización: 	05/11/2019	
Autoria: 	DAMIÁN, J.P.; BERACOCHEA, F.; HÖTZEL, M.J.; BANCHERO, G.; UNGERFELD, R.	
Afiliación: 	GEORGGET ELIZABETH BANCHERO HUNZIKER, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay.	
Título: 	Reproductive and sexual behaviour development of dam or artificially reared male lambs.	
Año de publicación: 	2015	
Fuente/Imprenta: 	Physiology and Behavior, 2015, v.147, p. 47-53.	
ISSN: 	0031-9384	
DOI: 	10.1016/j.physbeh.2015.04.004	
Idioma: 	Inglés	
Notas: 	Article history:Received date: 30 December 2014/Revised date: 27 March 2015/Accepted date: 2 April 2015.	
Contenido: 	ABSTRACT.

The objective of this study was to determine if artificially reared male lambs differ from those reared by their mothers in their reproductive development and sexual behaviour during the first breeding season and in their serum testosterone to a GnRH challenge at the end of the first breeding season. Lambs were assigned to two experimental groups: 1) artificially reared lambs, separated from their dams 24-36. h after birth (Week 0) and fed sheep milk until 10. weeks of age (group AR, n = 14); and 2) lambs reared by their dams until 10. weeks of age (group DR, n = 13). Reproductive parameters and sexual behaviour were recorded from Weeks 9 to 39. The GnRH challenge was performed on Week 40. Body weight, scrotal circumference, gonado-somatic index, testosterone concentration and sperm parameters were unaffected by group, but increased with age (P < 0.0001). Lambs reared by their mothers had greater values of gonado-somatic index on Weeks 9, 16 and 19 (P < 0.05), and tended to reach puberty earlier than AR (22.9 ± 0.7 vs. 25.1 ± 1.1. weeks, respectively, P = 0.087). Lambs reared by their mothers presented more lateral approaches and mount attempts than AR (P < 0.05), and DR lambs presented more mounts on Weeks 32 and 39 than AR (P < 0.05). Blood testosterone concentrations 3.5 and 4. h after the GnRH challenge were higher in AR than in DR lambs (P < 0.05). In conclusion mother rearing promoted sexual behaviour and reproductive performance of male lambs. 

© 2015.	
Palabras-Clave: 	COMPORTAMIENTO SEXUAL; CONCENTRACIÓN DE TESTOSTERONA; CORDEROS; CRIANZA ARTIFICIAL DE CORDEROS; CRIANZA NATURAL DE CORDEROS; DESEMPEÑO REPRODUCTIVO EN CORDEROS; GnRH; HABILIDAD MATERNA EN LA OVEJA; HORMONA LIBERADORA DE GONADOTROPINA; ÍNDICE GONADOSOMÁTICO; LACTANCIA MATERNA EN OVINOS; MOTILIDAD DE LOS ESPERMATOZOIDES; PUBERTAD PRECOZ EN CORDEROS; VÍNCULO MADRE-CRÍA.	
Thesagro: 	COMPORTAMIENTO REPRODUCTIVO; CORDEROS; OVINOS; REPRODUCTIVIDAD.	
Categoría del tema: 	L52 Fisiología Animal- Crecimiento y desarrollo
L53 Fisiología Animal - Reproducción	
Registro original: 	INIA Las Brujas (LB)	
Ejemplares: 	LB - (100804-1) - PXI - AP - DD -  -  -  - DIS
LE - (101247-1) - PXI - AP - DD -  -  -  - DIS