Evolution of fixed-time AI in dairy cattle in Brazil
Jose Luiz Moraes Vasconcelos, Marcos Henrique Colombo Pereira, Milo Charles Wiltbank, Thiago Guzela Guida, Francisco Rebolo Lopes Jr., Carlos Patricio Sanches Jr., Lucas Furtado dos Santos Pereira Barbosa, Wedson Maria Costa Jr., Anderson Kloster Munhoz
Various programs have been used to synchronize ovulation of a fertile oocyte, accompanied by fixed-time artificial insemination (FTAI). These programs involve a series of hormonal treatments to achieve four physiologic outcomes: 1) synchronize an ovarian follicular wave; 2) optimize conditions for ovulatory follicle development; 3) synchronize corpus luteum (CL) regression; and 4) synchronize ovulation. This manuscript summarizes studies conducted in Brazil with lactating dairy cows that aimed to increase pregnancy rates to E2/P4-based programs.
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