Eficiência reprodutiva de vacas Nelore submetidas à IATF com protocolos DIB® e Crestar® e suas variações / Reproductive efficiency of Nelore cows submitted to FTAI with DIB® and Crestar® protocols and their variations

ABSTRACT

The economic efficacy of beef cattle is linked to the production of calves, which are destined to the meatproduction or replacement of the herd. Therefore the reproductive efficiency of the bovine females is shown to beof great importance, mainly in relation to occurrence of the gestations at certain moments during thereproductive season. Fixed Time Artificial Insemination (FTAI) is a biotechnology that optimizes thereproductive management and guarantees satisfactory results. In this context, this research aimed to evaluateovulation synchronization protocols (Crestar®, DIB® and variations) used in breeding season, verifying thereproductive efficiency of Nelore cows submitted to FTAI. The results obtained from the FTAI program arewithin the predicted average, in which cows submitted to the DIB + BE protocol, used in the latter group,showed the best result, with a mean of 55.8% conception rate, being considered the most satisfactory within the four protocols used.