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Serving activity of a beef bull to heifers in which estrus was synchronized


, : Serving activity of a beef bull to heifers in which estrus was synchronized. Japanese Journal of Zootechnical Science 50(4): 235-239

Sexual behavior and reproductive efficiency of a Nihon Tankaku (Japanese Shorthorn) bull to 11 heifers were examined in a 10 m .times. 15 m free barn where they were housed for 48 h during the winter of 1977. Ten of the heifers were injected with PG[prostaglandin]F2.alpha. analog 43 h before observation. Estrous behavior appeared definitely in treated heifers during a period 43-91 h after PGF2.alpha. injection. Onsets of estrus were not observed at any particular time during the period. The bull mounted 4-20 times (89 in total) and ejaculated 3-8 times (29 in total) for 7 estrous heifers which comprised 6 PGF2.alpha.-treated and 1 non-treated ones. The bull showed serving activity to 6 of the estrous heifers in order; 7 of 8 estrous heifers conceived by housing with a bull for 48 h.

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