R. Bras. Zootec.01/Feb/2003;32(1):85-92.

Follicular dynamic and luteal regression in Gir and Nelore cows after treatment with cloprostenol sodic

Álan Maia Borges, Ciro Alexandre Alves Torres, José Reinaldo Mendes Ruas, Vicente Ribeiro Rocha Júnior, Giovanni Ribeiro de Carvalho, Jeferson Ferreira da Fonseca, Alberto Marcatti Neto, Anderson Jorge de Assis

DOI: 10.1590/S1516-35982003000100011

The follicular dynamics and luteal regression were studied in 12 Gir and seven Nelore cows, treated with analog prostaglandin F2a, between day 10 and 12 of the estrous cycle. The synchronization rate was higher than 92% for the two breeds, and the ovulation of second dominant follicle occurred in 72.7% of Gir and all Nelore cows. Ovulatory follicle diameter for Nelore was lower (11.0 ± 0.9 mm) than Gir cows (13.0 ± 1.7 mm). The average intervals from treatment to estrus, treatment to ovulation time and from the beginning of the estrus to ovulation were 88.7 and 91.6h, 119 and 113h, 26.5 and 24.3h for Nelore and Gir cows, respectively.

Follicular dynamic and luteal regression in Gir and Nelore cows after treatment with cloprostenol sodic

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