RESTRICTED SUCKLING AND SUPPLEMENTATION ON THE REPRODUCTION EFFICIENCY IN COWS UNDER DOUBLE PURPOSE SYSTEM

Objetive. To evaluate the effect of supplementation and suckling system on the reproductive efficiency postpartum in F1 (Holstein x Zebú) first calving cows under double purpose system. Materials and methods. 13 cows were used and four treatments were applied using a random design, with a factorial arrangement 2 x 2 with two feeding systems (supplemented and no supplemented) and 2 suckling systems (restricted and traditional) with three repetitions per experimental group: T1 - supplemented x restricted - T2 - supplemented x traditional - T3 - no supplemented x restricted - T4 - no supplemented x traditional. Results. The rate of luteal ovarian activity and the presentation of postpartum estrous found for treatments T1; T2; T3 and T4 was 0%; 0%; 0% and 33.3% (P>0,05). The percentage of postpartum anestrous in he same order was 100%; 100%; 100% and 66.6% (P>0,05) respectively. Conclusions. The supplementation and suckling systems did not have positive effect on the postpartum reproduction efficiency in F1 (Holstein x Zebú) first calving cows under double purpose system.