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Comparison of Estrous Behavior and Ovulation Time in Dairy Cows and Heifers  

Son, J.K. (Dairy Science Division, National Institute of Animal Science, RDA)
Park, S.B. (Dairy Science Division, National Institute of Animal Science, RDA)
Park, S.J. (Dairy Science Division, National Institute of Animal Science, RDA)
Baek, K.S. (Dairy Science Division, National Institute of Animal Science, RDA)
Lee, M.S. (Hanwoo Experiment Station, National Institute of Animal Science, RDA)
Ahn, B.S. (Dairy Science Division, National Institute of Animal Science, RDA)
Kim, H.S. (Dairy Science Division, National Institute of Animal Science, RDA)
Park, C.K. (Department of Animal Biotechnology, College of Animal Life Sciences, Kangwon National University)
Publication Information
Journal of Embryo Transfer / v.22, no.3, 2007 , pp. 185-190 More about this Journal
Abstract
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.
Keywords
Holstein cows; heifer; ovulation time; estrous behavior;
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