Fecha/hora: 11/06/2024 16:00:33

Biblioteca(s): 	INIA La Estanzuela.	
Fecha corriente: 	20/01/2022	
Fecha de la última actualización: 	20/01/2022	
Autoria: 	MINTEGUIAGA, M.A.; BANCHERO, G.; FIERRO, S.; ADRIEN, M.L.; OLIVERA-MUZANTE, J.	
Afiliación: 	Laboratorio de Reproducción Animal “Dr. Alfredo Ferraris”, Departamento de Ciencias Veterinarias y Agrarias, Facultad de Veterinaria. EEMAC, Universidad de la República. Ruta 3 km 363, 60000 Paysandú, Uruguay.; GEORGGET ELIZABETH BANCHERO HUNZIKER, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay; Secretariado Uruguayo de la Lana (S.U.L.), Área de Transferencia de Tecnología, Servando Gómez 2408, 12100 Montevideo, Uruguay.; Departamento de Ciencias Veterinarias y Agrarias, Facultad de Veterinaria. EEMAC, Universidad de la República. Ruta 3 km 363, 60000 Paysandú, Uruguay.; Laboratorio de Reproducción Animal “Dr. Alfredo Ferraris”, Dpto. de Producción Animal y Salud en los Sistemas Productivos, Facultad de Veterinaria, EEMAC, Universidad de la República, Ruta 3 km 363, Uruguay.	
Título: 	Impact of focus feeding on reproductive losses, prolificacy, or fecundity of estrous synchronized ewes.	
Año de publicación: 	2022	
Fuente/Imprenta: 	Livestock Science, 2022, Volume 256, Article number 104817. doi: https://doi.org/10.1016/j.livsci.2021.104817	
DOI: 	10.1016/j.livsci.2021.104817	
Idioma: 	Inglés	
Notas: 	Article history:Received 4 June 2021/ Revised 24 December 2021/ Accepted 27 December 2021/ Available online 30 December 2021.	
Contenido: 	ABSTRACT:The aim of this study was to evaluate the impact of a focus feeding (energy-protein supplementation) after a fixed 
timed artificial insemination (TAI) and before the review service, on reproductive and metabolic variables. Multiparous Merino ewes (312) from a commercial flock (-30? 44´ S; -57?39´W) grazing native pastures were synchronized with progestogens devices for 12 days (Days -14 to -2) and eCG at removal and cervical TAI (Day=0). On Day 7 post-TAI the ovulation rate (OR) was estimated, and two groups were formed: Supplemented (S; n = 155) and Control (C; n = 157). The S group was supplemented with soybean meal (1.2% of body weight) 
between Days 8 and 14. The review service was carried out between Days 14 and 21 using 2.5% fertile chest painted rams and the non-service return rate on Day 21 (NR-D21) calculated. Blood samples were obtained from 25 ewes of each group on Days 8, 12, 14, and 17 to evaluate no esterified fatty acid (NEFA) and urea plasma concentrations. On Day 26 OR was evaluated on the ewes with review service. Embryo losses, fertility, prolificacy, and fecundity of both services were estimated on Day 60 by transabdominal ultrasonography. No significant differences were observed in NR-D21 (65.8 vs. 63.7%), fertility (62.4 vs. 64.5%), prolificacy (1.32±0.75 vs. 1.33±0.76), fecundity (85.2 vs. 82.8%), or embryo losses from TAI service, or OR (1.16±0.37 vs. 1.15±0.36), fertility (87.7 vs. 92.4%), prolificacy (1.00±0.0 vs. 1.02±0.14) or fecundity (87.7 vs. 90.6%) of the review service for S and C groups respectively (P > 0.05). The urea concentrations increased significantly between Days 12 and 14 in S group (P < 0.05), and the NEFA concentration decreased faster with supplementation in the S group (P > 0.05). We concluded that a high energy-protein supplementation before the review service does not increases the reproductive losses from TAI, neither prolificacy nor fecundity of the review service.	
Palabras-Clave: 	Embryo losses; Fecundity  Ewe; Focus feeding.	
Thesagro: 	OVEJA.	
Categoría del tema: 	--	
Registro original: 	INIA La Estanzuela (LE)	
Ejemplares: 	LE - (103479-1) - PXI - AP - DD - PP/Livestock Science/2022 -  -  - DIS