Fecha/hora: 12/06/2024 15:05:04

Biblioteca(s): 	INIA Tacuarembó; INIA Treinta y Tres.	
Fecha corriente: 	18/10/2018	
Fecha de la última actualización: 	11/10/2019	
Autoria: 	LOPEZ VALIENTE, S.; MARESCA, S.; RODRÍGUEZ, A.M.; PALLADINO, R.A.; LACAU-MENGIDO, I.M.; LONG, N.M.; QUINTANS, G.	
Afiliación: 	S. LÓPEZ VALIENTE, National Institute of Agricultural Technology (INTA). Experimental Station of Cuenca del Salado.; S. MARESCA, National Institute of Agricultural Technology (INTA). Experimental Station of Cuenca del Salado.; A.M. RODRÍGUEZ, National Institute of Agricultural Technology (INTA). Experimental Station of Cuenca del Salado.; R.A. PALLADINO, Facultad de Agronomía, Universidad de Buenos Aires. Facultad de Ciencias Agrarias, Universidad Nacional de Lomas de Zamora, Buenos Aires.; I.M. LACAU-MENGIDO, Laboratorio de Regulación Hipofisaria, Instituto de Biología y Medicina Experimental (CONICET).; N.M. LONG, Department of Animal and Veterinary Sciences. Clemson University.; GRACIELA QUINTANS ILARIA, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay.	
Título: 	Effect of protein restriction of Angus cows during late gestation: subsequent reproductive performance and milk yield.	
Año de publicación: 	2018	
Fuente/Imprenta: 	The Professional Animal Scientist, 2018, 34(3): 261-268.	
DOI: 	10.15232/pas.2017-01701	
Idioma: 	Inglés	
Contenido: 	Abstract:
The effect of level of CP fed during late gestation on reproductive performance and milk production was studied in multiparous cows. Sixty-eight pregnant Angus cows were used. At 121 d prepartum, cows were blocked by BW (409 ± 57 kg) and expected calving date, randomly assigned to a low-protein (LP = 6% CP) or high-protein diet (HP = 12% CP), and allocated to 12 pens per treatment.
After parturition, all cows were managed in a single group until weaning. Body weight and BCS were determined at the start of the experiment, at calving, and at weaning.
Nonesterified fatty acids, insulin, IGF-1, and glucose were determined every 24 d prepartum and nonesterified fatty acids and glucose every 38 d postpartum. Progesterone was quantified weekly to indicate luteal activity and estimate interval to first estrus. Milk production was measured until weaning. The HP cows had greater BW gain during the prepartum period (P < 0.01) and tended to gain more BCS (P = 0.06) than LP cows. The prepartum diet did not affect gestation length (P = 0.44) or interval from calving to the onset of luteal activity (P = 0.35).
Pregnancy rates, milk quality, and production were not influenced by dietary treatments. Cows in the HP treatment had greater prepartum serum urea concentrations than LP treatment (P < 0.05). In conclusion, protein level prepartum in multiparous beef cows affected the BW change at calving, without consequences on reproductive performance and milk quality and yield.	
Palabras-Clave: 	LATE GESTATION; MILK YIELD; MULTIPAROUS COW; POSTPARTUM REPRODUCTIVE PERFORMANCE; PROTEIN RESTRICTION; VACAS MULTÍPARAS.	
Thesagro: 	BOVINOS; VACAS.	
Categoría del tema: 	L10 Genética y mejoramiento animal	
Registro original: 	INIA Tacuarembó (TBO)	
Ejemplares: 	TBO - (102890-1) - PXI - AP - DD -  -  -  - DIS
TT - (102610-1) - PXI - AP - DD - PP/Prof.Anim.Scientist/2018/34 -  -  - DIS