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Archivos de Zootecnia

On-line version ISSN 1885-4494Print version ISSN 0004-0592


GUERRERO, H.L.J. et al. Rate of PGF2α -synchronized ovulation and follicular dynamics in criollo lechero tropical cows. Arch. zootec. [online]. 2011, vol.60, n.232, pp.1335-1338. ISSN 1885-4494.

Estrus was synchronized in 36 cyclic and lactating Criollo Lechero Tropical (CLT) cows using PGF2α, 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 PGF2α, and the DF and DC were similar to other dairy and beef Bos taurus breeds.

Keywords : Estrous cycle; Ovulation.

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