Induction of heifers for artificial insemination protocol at fixed time: Review

Abstract

The present work aimed to describe some important concepts regarding the reproductive physiology of pharmacological control of the estrous cycle, presenting different protocols for IATF. IATF has become one of the leading reproductive biotechnologies of economic importance in cattle production globally. The different drugs currently available on the market allow synchronization of the estrous cycle in heifers with the aim of maximizing reproductive rates. In the current literature, numerous protocols are cited capable of inducing ovulation for IATF, making it necessary to know these protocols in a broad and deep way, in order to select the best for a given situation and objective.

Mesenchymal stem cells in animal reproduction: sources, uses and scenario

“…Additionally, the application of E2 prevents smaller follicles from developing, interrupting the rise in follicle-stimulating hormone (FSH) concentration. Thus, the two waves of gonadotropins signaling the start of follicular growth are interrupted; this synchronization is referred to as D0, and after 4 days, the emergence of a new follicular wave can be observed (Oliveira et al, 2018).…”

Associação de diferentes hormônios esteroides e gonadotrofinas em protocolos de sincronização do estro e indução da ovulação para IATF em fêmeas bovinas da raça Nelore

“…Effect of estrogens, category, and CL on D0 was found for DDF on D8.5, category and CL on D0 for DDF on D10 and none influence in the results of pregnancy was found in dominant follicle growth rate from D8.5 to D10. Oliveira, et al, (2018) reported that females that have CL at the beginning of the breeding season have higher pregnancy rates compared to acyclic females.…”