Anticipation of estrus and ovulation in Nelore heifers with low antral follicle count

Jair Sábio de Oliveira Júnior; George Moreira da Silva; Elizângela Mírian Moreira; Jéssica Souza Andrade; Vanessa Rachele Ribeiro Nunes; Fábio Morotti; Evelyn Rabelo Andrade; Marcelo Marcondes Seneda; Luiz Francisco Machado Pfeifer

doi:10.33448/rsd-v11i6.28576

Autores/as

Jair Sábio de Oliveira Júnior Centro Universitário UNIFACIMED https://orcid.org/0000-0003-1042-2859
George Moreira da Silva Universidade Federal de Rondônia https://orcid.org/0000-0002-3705-0170
Elizângela Mírian Moreira Fundação de Amparo à Pesquisa do Estado de Rondônia https://orcid.org/0000-0001-7346-6571
Jéssica Souza Andrade Rede BIONORTE https://orcid.org/0000-0002-9595-6966
Vanessa Rachele Ribeiro Nunes Amazonpec https://orcid.org/0000-0002-2125-2472
Fábio Morotti Universidade Estadual de Londrina https://orcid.org/0000-0003-4476-6449
Evelyn Rabelo Andrade Universidade Federal de Rondônia https://orcid.org/0000-0003-0393-9884
Marcelo Marcondes Seneda Universidade Estadual de Londrina https://orcid.org/0000-0002-5097-5119
Luiz Francisco Machado Pfeifer Empresa Brasileira de Pesquisa Agropecuária https://orcid.org/0000-0003-2069-951X

DOI:

https://doi.org/10.33448/rsd-v11i6.28576

Palabras clave:

Folículos antrales; Operaciones bovinas; Bovinos; Ovulación.

Resumen

El objetivo de este estudio fue establecer la relación entre el conteo de folículos antrales (AFC), el tiempo de pubertad y la respuesta ovárica en novillas Nelore sometidas a protocolos inseminación artificial a tiempo fijo (TAI). Novillas Nelore prepubescentes (Bos indicus; n = 30) fueron examinadas mediante ultrasonido transrectal y se grabaron videos de los ovarios para posterior CFA (≥ 3 mm). Después de AFC, las vaquillas se dividieron en 2 grupos, AFC bajo y entonces se realizaron evaluaciones de ovario para determinar el inicio de la pubertad. Una vez establecida la pubertad, las vaquillas fueron sometidas a un protocolo FTAI. No hubo diferencias (P > 0.1) entre los grupos en el momento de la pubertad, la tasa de ovulación, la proporción de vaquillas que expresaron celo y el diámetro del folículo preovulatorio. Sin embargo, las vaquillas con AFC bajo tuvieron menor área ovárica en el período prepuberal (4,36 ± 0,3 x 5,65 ± 0,2 cm2) y, en el IATF, tuvieron el momento del estro (48 ± 0,0 x 58,5 ± 3,1 h) y ovulación más temprana (60 ± 1,8 x 72,6 ± 4,7 h) en comparación con novillas con AFC alto (P < 0,05). Además, las vaquillas en el grupo de AFC bajo tuvieron una tasa de preñez más alta (P = 0.05) (76.9 %, 10/13) que el grupo de AFC alto (29.4 %, 5/17). Las vaquillas con AFC bajo tuvieron el momento de ovulación anticipado y mayor preñez por IA en comparación con las vaquillas con AFC alto.

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Anticipación del estro y ovulación en novillas Nelore con bajo conteo de foliculos antrales

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