Fecha/hora: 07/06/2024 15:06:57

Biblioteca(s): 	INIA La Estanzuela; INIA Treinta y Tres.	
Fecha corriente: 	11/11/2019	
Fecha de la última actualización: 	03/08/2021	
Autoria: 	LÓPEZ-MAZZ, C.; REGUEIRO, M.; BALDI, F.; QUINTANS, G.; BANCHERO, G.	
Afiliación: 	CARLOS LÓPEZ-MAZZ, Departamento de Producción Animal y Pasturas. Facultad de Agronomía, Montevideo, Uruguay.; M. REGUEIRO, Departamento de Producción Animal y Pasturas. Facultad de Agronomía, Montevideo, Uruguay.; F. BALDI, Facultade de Ciencias Agrárias e Veterinárias, Jaboticabal, Sao Paulo, Brazil.; GRACIELA QUINTANS ILARIA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; GEORGGET ELIZABETH BANCHERO HUNZIKER, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay.	
Título: 	La esquila a los 50 días de gestación de ovejas en pastoreo afectó positivamente el peso corporal pero no parámetros reproductivos y de salud de los corderos machos durante los primeros 18 meses de edad.	
Año de publicación: 	2019	
Fuente/Imprenta: 	In: QUINTANS, G.; IEWDIUKOW, M. (Ed.). Primer Seminario Técnico de Programación Fetal. Montevideo (UY): INIA, 2019. p. 125-134.	
Série: 	(INIA Serie Técnica; 252)	
ISBN: 	978-9974-38-436-1	
ISSN: 	1688-9266	
Idioma: 	Español	
Contenido: 	ABSTRACT
This study evaluated the effects of shearing at 50 days of gestation on the productive, reproductive and response to a gastrointestinal parasite challenge of male offspring from weaning (104 d) to 18 months old. In total, 79 Polwarth male lambs were used, 44 single (S) and 35 twin (T) born to ewes either shorn at 50 days of pregnancy (PS, n =41) or shorn at 62 days post-partum (U, control, n = 38) resulting in four sub-groups: SPS: single male lambs born to ewes shorn at 50 days of pregnancy (n = 23), SU: single male lambs born to postpartumshorn ewes (n = 21), TPS: twin males lambs born to ewes shorn at 50 days of pregnancy (n = 18) or TU: twin female lambs born to postpartum shorn ewes (n = 17). The lambs were kept together on improved pasture throughout the entire experiment. Body weight, body condition score and fecal eggs count were recorded every 14 days from weaning to 18 months old.
Ultrasound measurements in vivo were performed at 12.5 months and 14.6 months old to estimate of ribeye area (REA) and backfat thickness (BFT) in the ongissimus dorsi muscle and the thickness of fat in the hip region (P8).
Furthermore, plasma testosterone concentration was determined once every two weeks to establish the age at onset of puberty. PS male lambs were heavier (P = 0,02) than U male lambs. Shearing treatment had no effect on none of the parameters of body development (P &#707; 0,05). However, REA (P = 0.06) and P8 (P = 0,02) were higher at 14.6 mo than 12.5 mo old. Testosterone concentration, age at puberty and testicular weight were not different (P &#707; 0,05) among treatments. Single male lambs reached puberty earlier (P = 0.06) than twin. Prepartum shearing did not affect the parasite egg count and the Famacha index. The study concludes that ewe shearing at 50 days of gestation positively influences the bodyweight of male offspring from weaning onwards but not the other evaluated traits	
Palabras-Clave: 	CORDEROS; CRECIMIENTO; ESQUILA TEMPRANA; REPRODUCCIÓN.	
Categoría del tema: 	L53 Fisiología Animal - Reproducción	
URL: 	http://www.ainfo.inia.uy/digital/bitstream/item/13793/1/St-252-p-125-134-Lopez-Mazz.pdf	
Registro original: 	INIA La Estanzuela (LE)	
Ejemplares: 	LE - (103148-1) - INI - PL - DD - UY/INIA/ST/252/2019 -  - st252 - DIS
TT - (102923-1) - INI - PL - DD - UY/INIA/ST/252/2019 -  - st-252 - DIS