Effect of body condition score on ovary score and pregnancy rate in timed artificial insemination programs in Nellore females

Giovanna Clara Marques dos Santos; Muller Carrara Martins; Ricarda Maria dos Santos

doi:10.1590/1809-6891v27e-84209E

Autores

Giovanna Clara Marques dos Santos Universidade Federal de Uberlândia (UFU), Uberlândia, Minas Gerais, Brasil https://orcid.org/0009-0008-8058-3213
Muller Carrara Martins Universidade Federal de Uberlândia (UFU), Uberlândia, Minas Gerais, Brasil https://orcid.org/0000-0001-9519-6816
Ricarda Maria dos Santos Universidade Federal de Uberlândia (UFU), Uberlândia, Minas Gerais, Brasil https://orcid.org/0000-0001-6118-7962

DOI:

https://doi.org/10.1590/1809-6891v27e-84209E

Resumo

Objetivou-se com este estudo avaliar o efeito do escore de condição corporal (ECC), no início do protocolo de inseminação artificial em tempo fixo (IATF), no escore de ovário (EO) e na taxa de prenhez por IATF (P/IATF) em fêmeas Nelore. Um total de 1.790 fêmeas, classificadas de acordo com a paridade (n= 586 novilhas, 421 primíparas e 783 multíparas), foram submetidas ao protocolo de IATF. Foram realizadas avaliações de ECC [1- muito magra a 9- muito gorda] e EO [1- ovário com folículos pequenos (<5 mm); 2- ovário com folículos grandes (>7 mm); 3- ovário com corpo lúteo]. O protocolo de IATF foi a base de estrógeno e progesterona e o diagnóstico de prenhez foi realizado 30 dias após a IATF. A categoria animal influenciou o ECC, EO e P/IATF. Não houve efeito do ECC na P/IATF das vacas multíparas, mas nas vacas primíparas houve uma tendência e um efeito nas novilhas foi detectado. As vacas primíparas e novilhas com melhores ECC apresentaram melhor P/IATF. Foi detectado efeito do ECC no EO em todas as categorias avaliadas e as fêmeas com melhores ECC também tiveram melhores EO. Em conclusão, o ECC no início do protocolo de IATF influencia o EO em todas as categorias avaliadas e a P/IATF nas primíparas e novilhas.
Palavras-chave: eficiência reprodutiva; gado de corte; multíparas; novilhas; primíparas.

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