Fecha/hora: 09/06/2024 13:27:44

Biblioteca(s): 	INIA Treinta y Tres.	
Fecha corriente: 	12/09/2014	
Fecha de la última actualización: 	11/10/2019	
Autoria: 	QUINTANS, G.; VÁZQUEZ, A.I.; WEIGEL, K.A.	
Afiliación: 	GRACIELA QUINTANS ILARIA, Instituto Nacional de Investigación Agropecuaria (INIA), Uruguay.	
Título: 	Effect of suckling restriction with nose plates and premature weaning on postpartum anoestrous interval in primiparous cows under range conditions.	
Año de publicación: 	2009	
Fuente/Imprenta: 	Animal Reproduction Science, 2009, v. 116, no. 1-2 p. 10-18.	
ISSN: 	0378-4320	
DOI: 	10.1016/j.anireprosci.2008.12.007	
Idioma: 	Inglés	
Notas: 	Article history: Received 4 September 2008 // Received in revised form 4 December 2008 // Accepted 9 December 2008 // Available online 14 December 2008.	
Contenido: 	Abstract
Suckling and nutrition are generally recognized as two major factors controlling the duration of the postpartum anovulatory period. In the present study, the effect of premature weaning and suckling restriction with nose plates (NPs) on cow and calf performance was evaluated. The study was conducted over 2 years; primiparous Hereford cows, weighing (mean+/-S.E.M.) 344+/-3.5kg and with 4.1+/-0.05 units of body condition score (BCS) (scale 1-8 [Vizcarra, J.A., Ibañez, W., Orcasberro, R., 1986. Repetibilidad y reproductibilidad de dos escalas para estimar la condición corporal de vacas Hereford. Investigaciones Agronómicas 7 (1), 45-47]) at calving, remained with their calves until 72.5+/-1.2 days postpartum (day 0). They were then assigned to one of three treatments: (i) calves with free access to their dams and ad libitum suckling (S, n=29); (ii) calves fitted with NPs for 14 days, but remained with their dams (NP, n=29), and (iii) calves that were weaned from their dams (W, n=28). All cows were anestrus at the time treatments commenced (day 0). All cows were blood sampled twice weekly from 1 week before the beginning of the experiment until the end of the mating period (day 74) for progesterone analysis. The mating period began on day 14. Cows in W treatment had ovulations earlier (P<0.05) than those in NP and S groups. Cows in the NP group had longer (P<0.05) intervals between the first progesterone increase and normal luteal phase than cows in the other two treatments groups (23.3+/-3.2 vs. 6.5+/-3.2 and 5.2+/-3.3 days for NP, S and W cows, respectively). Fifty per cent of the cows with NP had a short cycle (7 days) but there was a group of cows that had longer (P<0.05) intervals (66 days) between first progesterone increase and normal estrous activity. In the NP group, 8 of 29 cows had a short luteal phase and then a normal one; for 9 of these 29 cows progesterone concentrations remained low for 6 weeks from the beginning of the treatment; and for 12 of these 29 cows progesterone concentrations initially increased after treatment initiation, but these animals became anestrus thereafter. Short-term suckling restriction with NPs led to a variable response in primiparous cows of moderate body condition under range conditions.	
Thesagro: 	DESTETE; GANADO DE CARNE; GANADO VACUNO; INTERVALO INTERPARTO; TABLILLA NASAL.	
Categoría del tema: 	L53 Fisiología Animal - Reproducción	
Registro original: 	INIA Treinta y Tres (TT)	
Ejemplares: 	TT - (100038-1) - PXI - AP - DD - PP/Quintans/Arb/2009/1 -  -  - DIS