Resumo

GUERRERO, H.L.J. et al. Rate of PGF_2α -synchronized ovulation and follicular dynamics in criollo lechero tropical cows. Arch. zootec. [online]. 2011, vol.60, n.232, pp.1335-1338. ISSN 1885-4494.  https://dx.doi.org/10.4321/S0004-05922011000400051.

Estrus was synchronized in 36 cyclic and lactating Criollo Lechero Tropical (CLT) cows using PGF_2α, and the time of start and end of estrus, time of ovulation (TO) and ovulation rate (TAO) were recorded. Also, the follicular dynamics (DF) and the duration of estrus (DC) were determined during the natural estrous cycle that followed the synchronized one. The TO following the end of the synchronized estrus was 16.5±3.6 h and TAO was 100%. In the natural estrous cycle, 93% of the cows showed three follicular waves and 7% showed two waves, and DC was 22 and 19 days, respectively. The CLT cows showed good response to synchronization with PGF_2α, and the DF and DC were similar to other dairy and beef Bos taurus breeds.

Palavras-chave : Estrous cycle; Ovulation.

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