Escore de condição corporal e desempenho reprodutivo de vacas leiteiras mestiças lactantes

Abstract

The objective was to evaluate the effect of lactation order, racial composition and milk production in the body condition score (BCS) at prepartum and its variation at postpartum. Furthermore, evaluate the effect of BCS at prepartum and its variation at postpartum on reproductive performance in dairy cows. Data was collected, relating to 470 parturitions for two years at 3 properties in Gurinhatã-MG. Milk production was measured monthly and the evaluation of the BCS was made by a single individual in the prepartum and postpartum (from 1.0 to 5.0). Was used the conventional artificial insemination, timed artificial insemination and controlled ride. The pregnancy diagnosis was through rectal palpation from 40 days after the service. The variables were analyzed using the SAS GLIMMIX procedure. The racial composition affected the BCS at prepartum (P=0.0003). Milk production tended to affect the BCS at prepartum (P=0.0957) and its variation in postpartum (P=0.1179). The overall conception rate was 57.3% and was affected (P<0.0001) by type of service. There was no effect of the BCS in prepartum (P=0.1544) and the variation of BCS (P=0.3127) on conception rate. Had no effect of BCS interaction at prepartum (P=0.9516) and the variation of BCS (P=0.9506) with the type of service on conception rate. The BCS at prepartum affect the service period (P<0.0001). Cows with BCS less than 3.25 became pregnant earlier. The variation of the BCS affected the service period (P<0.0001). Cows with loss of ECC became pregnant earlier than cows without loss. The average loss of ECC at postpartum was -0.692 points, not enough to damage the reproductive performance of dairy cows.