Estradiol e prostaglandina na concepção de vacas nelore sincronizadas para ia em tempo fixo

Abstract

The objective was to evaluate the pregnancy rate of Nellore cows submitted to estrous synchronization for fixed-time artificial insemination The efficiency of the estradiol cypionate (CE) and benzoate (BE) to induce atresia and new follicular emergence wave in the beginning (day 0; D0) of progesterone device (CIDR®) treatment was tested. The administration of prostaglandin at CIDR device withdrawal (day 9; D9, three handlings protocol) or 48 h before it (day 7; D7, four handlings protocol) was also verified. A 2x2 factorial designwas established (CE vs. EBE and PGFD7 vs. PGFD9). No differences were showed between treatments (p<0.05), being possible to employ the three handlings protocol.