EVALUATION OF COW REPRODUCTIVE PERFORMANCE IN THE REGION OF MATO GROSSO DO SUL SWAMP SUBMITTED TO TAI WITH GnRH APPLICATION

• Autor(a) principal: Perucchi, Gabriel Rodrigo Hass
• Data de Publicação: 2023
• Outros Autores: Sartori, Gabriela de Souza, Silva, Richarlla Aparecida Buscariol, Garcia, Murilo da Silva, Jardim, Rodrigo José Delgado, Frias, Danila Fernanda Rodrigues
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Nativa (Sinop)
• Texto Completo: https://periodicoscientificos.ufmt.br/ojs/index.php/nativa/article/view/11184
• topic: bovino de corte; inseminação artificial em tempo fixo; produtividade; GnRH; Nelore

The technique of timed artificial insemination (TAI) is spreading in Brazil, as it contributes to the increase of productivity. The objective of this work was to evaluate the use of GnRH in TAI protocols of cows raised in the swamp of Mato Grosso do Sul. 531 Nelore breed calved cows participate in the survey, which were evaluated according to the body condition score (BCS), and then performed three types of TAI protocols (batch 1, 2 and 3). After 40 days of the insemination, a pregnancy diagnosis was made. The matrices that did not receive GnRH in batch 1 (apparent oestrus), batch 2 (partial oestrus) and batch 3 (no oestrus presentation) presented respectively 55.4%, 19.2% and 25.9% of pregnancy, while those receiving the drug showed 48.6%, 37.2% and 38.8%. Related to BCS, it can be observed that the highest pregnancy rate occurred in animals with BCS 3. Primiparous had a better pregnancy rate when receiving GnRH regardless of BCS. It was concluded that the use of GnRH was efficient to improve the pregnancy rate mainly in primiparous as well as animals that showed no oestrus or partial oestrus, and matrices with BCS 3 had better pregnancy rates than cows with lower scores.