Fecha/hora: 11/06/2024 17:09:34

Biblioteca(s): 	INIA Las Brujas; INIA Tacuarembó.	
Tipo de la producción científica: 	Artículos en Revistas Indexadas Internacionales	
Circulación/Nivel: 	A - 2	
Fecha corriente: 	08/09/2014	
Fecha de la última actualización: 	16/11/2015	
Autoria: 	FIERRO, S.; GIL, J.; VIÑOLES, C.; OLIVERA-MUZANTE, J.	
Afiliación: 	CAROLINA VIÑOLES GIL, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay.	
Título: 	The use of prostaglandins in controlling estrous cycle of the ewe: A review.	
Año de publicación: 	2013	
Fuente/Imprenta: 	Theriogenology, 2013, v. 79, no.3, p. 399?408.	
ISSN: 	0093-691X	
DOI: 	10.1016/j.theriogenology.2012.10.022	
Idioma: 	Inglés	
Contenido: 	ABSTRACT.

This review considers the use of prostaglandin F2a and its synthetic analogues (PG) for controlling the estrous cycle of the ewe. Aspects such as phase of the estrus cycle, PG
analogues, PG doses, ovarian follicle development pattern, CL formation, progesterone synthesis, ovulation rate, sperm transport, embryo quality, and fertility rates after PG
administration are reviewed. Furthermore, protocols for estrus synchronization and their success in timed AI programs are discussed. Based on available information, the ovine CL is refractory to PG treatment for up to 2 days after ovulation. All PG analogues are effective when an appropriate dose is given; in that regard, there is a positive association between the dose administered and the proportion of ewes detected in estrus. Follicular response after PG is dependent on the phase of the estrous cycle at treatment. Altered sperm transport and low pregnancy rates are generally reported. However, reports on alteration of the steroidogenic capacity of preovulatory follicles, ovulation rate, embryo quality, recovery rates, and prolificacy, are controversial. Although various PG-based protocols can be used for estrus synchronization, a second PG injection improves estrus response when the stage of the estrous cycle at the first injection is unknown. The estrus cycle after PG administration has a normal length. Prostaglandin-based protocols for timed AI achieved poor reproductive outcomes, but increasing the interval between PG injections might increase pregnancy rates. Attempts to improve reproductive outcomes have been directed to provide a synchronized LH surge: use of different routes of AI (cervical or intrauterine), different PG doses, and increased intervals between PG injections. Finally we present our point of view regarding future perspectives on the use of PG in programs of controlled sheep reproduction.

@ 2013 Elsevier Inc. All rights reserved	
Thesagro: 	FERTILIDAD; OVEJAS; OVINOS; PROSTAGLANDINAS.	
Categoría del tema: 	--	
Registro original: 	INIA Las Brujas (LB)	
Ejemplares: 	LB - (100830-1) - PXI - AP - DD -  -  -  - DIS
TBO - (100014-1) - PXI - AP - PP - PP/THERIOGENOLOGY/2013 -  -  - DIS