Resumo

GUERRERO, H.L.J. et al. Estrus synchronization with PGF_2α and estrous behavior in Criollo Lechero Tropical cows. Arch. zootec. [online]. 2011, vol.60, n.231, pp.829-832. ISSN 1885-4494.  https://dx.doi.org/10.4321/S0004-05922011000300073.

In 36 cyclic and lactating Criollo Lechero Tropical (CLT) cows estrus was synchronized with PGF_2α and the estrus manifestation (ME) rate, the onset (IE), end and duration (DE) of estrus were determined; in addition, the sexual behavior of the cows and the time spent grazing, ruminating, resting and sleeping in the proestrus, estrus and metestrus were recorded. The ME rate was 67%, the time of IE after PGF_2α was at 80.5±10.3 h and the DE was 16.2±1 h. During estrus cows received 67±13 mounts and gave 62.3±22, 27.9±19.6 buttings, 21.4±4 genitalia sniffing and 1.7±0.4 Flehmen were observed, and cows spent 3.2±2.1 h following other herdmates, 2±1.3 h grazing, 1.7±0.8 h ruminating, 1.5±0.3 h resting and 0.2±0.1 h sleeping. In conclusion, PGF_2α produced acceptable ME rate and intense sexual behavior in CLT cows, while time spent feeding and resting decreased during estrus. It is necessary to study the natural estrous cycle to accurately determine the behavior of CLT cows during estrus.

Palavras-chave : Estrous cycle; Sexual behavior.

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