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KMID : 1005220070220030185
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Journal of Embryo Transfer
2007 Volume.22 No. 3 p.185 ~ p.190
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Comparison of Estrous Behavior and Ovulation Time in Dairy Cows and Heifers
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Son Jun-Kyu
Baek Kwang-Soo
Lee Myeung-Sik
Ahn Byeong-Seog
Kim H. S.
Park Choon-Keun
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Abstract
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The objective of this study was to investigate the characteristics of various estrous behavior and ovulation time in dairy cows and heifers. In total, 73 ovulations and 61 estrous detection were observed in 89 Holstein cows. Various estrous behavior were observed during 72 hours from two days after PGF_2{alpha} injection and their relation with the time of ovulation(ultrasound examinations at 4-h intervals) was investigated. In estrous periods, the rate of sniffing, chin resting, mounting and standing heat was 81%, 78%, 78% and 56%, respectively in cows. In heifers, the rate of sniffing, chin resting, mounting and standing heat was 61%, 68%, 82% and 76%, respectively. Ovulation in cows and heifers occurred 25.58{pm}7.94;and;25.55{pm}5.72h after onset of estrus, and 13.42{pm}7.14;and;7.48{pm}7.41h after end of estrus, respectively. Interval between onset of estrus and ovulation time was significantly (p<0.05) shorter for standing heat (17.33{pm}5.83;h) than for mounting, sniffing and chin resting (23.58{pm}5.12;h,;24.25{pm}6.09;h,;23.42{pm}6.04;h) in cows but not significantly different in heifers. Interval between end of standing heat and ovulation time was significantly (p<0.05) shorter for heifer(6.38{pm}4.80) than for cows(13.05{pm}4.53). Our results show that characteristics of estrous behavior and ovulation in dairy heifers are different to that of cows.
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KEYWORD
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Holstein cows, heifer, ovulation time, estrous behavior
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