Fecha/hora: 11/06/2024 07:48:18

Biblioteca(s): 	INIA La Estanzuela.	
Fecha corriente: 	24/04/2018	
Fecha de la última actualización: 	04/11/2019	
Autoria: 	ERRANDONEA, N.; FIERRO, S.; VIÑOLES, C.; GIL, J.; BANCHERO, G.; OLIVERA-MUZANTE, J.	
Afiliación: 	N. ERRANDONEA, a Laboratorio de Reproduccion Animal ?Dr. Alfredo Ferraris?, Facultad de Veterinaria, Universidad de la República, Paysandú, Uruguay.; S. FIERRO, b Secretariado Uruguayo de la Lana (S.U.L.), Area de Transferencia de Tecnología, Montevideo, Uruguay.; CAROLINA VIÑOLES, Polo Agroforestal, EEBR, Universidad de la República, Cerro Largo, Uruguay.; J. GIL, d Laboratorio de Reproduccion Animal  “Dr. Alfredo Ferraris”, Polo Produccion Reproducci  on de Rumiantes, Facultad de Veterinaria, EEMAC, Universidad de la República, Paysandú, Uruguay.; GEORGGET ELIZABETH BANCHERO HUNZIKER, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; J. OLIVERA-MUZANTE, Laboratorio de Reproduccion Animal  “Dr. Alfredo Ferraris”, Departamento de Ovinos, Lanas y Caprinos, Facultad de Veterinaria, EEMAC, Universidad de la República, Paysandú, Uruguay.	
Título: 	Short term protein supplementation during a long interval prostaglandin-based protocol for timed AI in sheep.	
Año de publicación: 	2018	
Fuente/Imprenta: 	Theriogenology, v. 117, p. 34?39, 2018.	
DOI: 	10.1016/j.theriogenology.2018.03.021	
Idioma: 	Inglés	
Notas: 	Article history: Article history:Received 14 November 2017//Received in revised form 23 February 2018//Accepted 14 March 2018//
Available online 21 March 2018.	
Contenido: 	Abstract:
The aim of this study was to evaluate the reproductive impact of a short-term protein supplementation on a long interval prostaglandin-based protocol (two PG injections 15 d apart; PG15) for timed artificial insemination in sheep. During the breeding season, 437 multiparous Merino ewes grazing native pastures (forage allowance of 6 kg of dry matter/100 kg of live weight; crude protein: 10.8%, metabolic energy: 2.1 Mcal/kg of dry matter) were selected. Ewes were allocated, according to body condition score (3.2 ± 0.2) and body weight (40.6 ± 4.9 kg, mean ± SD), to a 2 × 2 factorial design: type of estrus ?spontaneous estrus (SE) or induced with PG15 (PG15)?, and supplementation (yes or no) before insemination (+FF; soybean meal at Days ?10 to ?3; crude protein: 51.9%, metabolic energy: 2.8 Mcal/kg of dry matter; average consumption 0.9% live weight/ewe/day of dry matter). All ewes were cervically artificial inseminated (Day ?2 to ?3 in SE ewes at estrus detection; Day 0 = timed artificial insemination in PG15 ewes). Ovulation rate on Day 7, non-return to service on Day 23, conception, fertility, prolificacy and fecundity on Day 60 were evaluated. Ovulation rate (1.17 ± 0.40 vs. 1.06 ± 0.25), non-return to service at Day 23 (81.7 vs. 64.2%), conception (78.8 vs. 61.5%), fertility (75.2 vs. 61.5%) and fecundity (0.77 vs. 0.62) were higher in ewes from SE than PG15 group (P < 0.05). However, no differences were observed in prolificacy (1.02 ± 0.16 vs. 1.01 ± 0,12) between groups (P > 0.05). Protein supplementation increased ovulation rate (1.30 ± 0.45 vs. 1.17 ± 0.40), prolificacy (1.18 ± 0.39 vs. 1.02 ± 0.16) and fecundity (0.94 vs. 0.77%; P < 0.05), but not non-return to service on Day 23 (83.8 vs. 81.7%), conception (82.9 vs. 78.8%) or fertility (79.1 vs. 75.2%; P > 0.05) in SE group. The supplement feed to PG15 ewes increased ovulation rate (1.35 ± 0.45 vs. 1.06 ± 0.25), prolificacy (1.25 ± 0.43 vs. 1.01 ± 0.12) and fecundity (0.79 vs. 0.62%; P < 0.05) to levels comparable to SE + FF ewes (P > 0.05). The magnitude of the increase in ovulation rate in PG15 was greater than in the SE group (27 vs. 11%; P < 0.05). However, non-return to service on Day 23 (65.1 vs. 64.2%), conception (63.3 vs 61.5%), and fertility rate (63.3 vs. 61.5%; P < 0.05) remained similar in PG15 supplemented or not supplemented ewes. In conclusion, a short-term protein supplementation before cervical time artificial insemination improved the reproductive performance of ewes synchronized with the PG15 protocol to levels comparable to the SE group	
Palabras-Clave: 	EWE; FERTILITY; FOCUS FEEDING; PROSTAGLANDIN; TIMED ARTIFICIAL INSEMINATION.	
Thesagro: 	FERTILIDAD; INSEMINACIÓN ARTIFICIAL; OVEJAS; PROSTAGLANDINAS.	
Categoría del tema: 	--	
Registro original: 	INIA La Estanzuela (LE)	
Ejemplares: 	LE - (102382-1) - PXI - AP - DD -  -  -  - DIS