Evolution of fixed-time AI in dairy cattle in Brazil

Vasconcelos, Jose Luiz Moraes; Pereira, Marcos Henrique Colombo; Wiltbank, Milo Charles; Guida, Thiago Guzela; Lopes Jr, Francisco Rebolo; Sanches Jr, Carlos Patricio; Barbosa, Lucas Furtado dos Santos Pereira; Costa Jr, Wedson Maria; Munhoz, Anderson Kloster

p. 940-951

Evolution of fixed-time AI in dairy cattle in Brazil

Vasconcelos, Jose Luiz MoraesPereira, Marcos Henrique ColomboWiltbank, Milo CharlesGuida, Thiago GuzelaLopes Jr, Francisco ReboloSanches Jr, Carlos PatricioBarbosa, Lucas Furtado dos Santos PereiraCosta Jr, Wedson MariaMunhoz, Anderson Kloster

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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FTAI

Pregnancy rates