Comparativo de diferentes protocolos de indução de ciclidade em novilhas precoce da raça nelore

Abstract

Animal reproduction is an important factor for the productivity of farms that work with calf. With that in mind, several biotechnologies are applied aiming at productivity and economic factors in the activity. The objective of this work was to discuss the cyclicity induction protocols in Nellore heifers, with an average weight of 320 kg and age between 14 and 16 months. Two types of cyclicity induction protocols were performed, one using injectable progesterone and estradiol and the second using intravaginal implantation of progesterone and estradiol, with this we had excellent responses from both types of protocols, intravaginal implantation of progesterone and estradiol having a superior response of 10% injectable progesterone and estradiol, with this we have the conclusion that the two protocols induce cyclicities, and the two protocols bringing good responses in the animals, going from a low cyclicity rate to a very high rate of response of the animals with the protocol, more we would need more studies on injectable progesterone and also review some questions about intravaginal implantation of progesterone.