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KMID : 1005220070220010047
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Journal of Embryo Transfer
2007 Volume.22 No. 1 p.47 ~ p.51
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Synchronization of Estrus in Thoroughbred Mares
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Son D. S.
Lee Choung-Seop
Cho C. Y.
Choi C. Y.
Choi Sun-Ho
Kim H- J.
Hur Tai-Young
Suh Guk-Hyun
Ryu Il-Sun
Kim Myung-Cheol
Choi Sang-Yong
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Abstract
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The objective of this study was to improve the reproductive ability of Thoroughbred mares with artificial estrous regulation by hormone treatments and artificial illumination. The results were as follows; Estrous detection in cycling mares which were treated $PGF_2{\alpha}$ or altrenogest administration was all 100%, and pregnancy rates were 95.2% and 71.4%, respectively. Estrous detection was 100% within March when altrenogest was administered alone or together with estradiol for non-pregnant mares in the previous year. Interval to estrous detection after altrenogest administration was 4.3 days in single administration of altrenogest and 3.7 days in combined administrations of altrenogest and estradiol, respectively Interval to ovulation after estrous detection were 2.7 and 2.5days, respectively. Pregnancy rate following single altrenogest administration was 80.0%. Estrous detection and pregnancy rates by artificial illumination in non-pregnant mares were 92.9% and 46.9%, respectively. These results show that estrous synchronization of mares during breeding season will be able to improve the pregnancy rate, and altrenogest administration in non-pregnant mares in the previous year will be able to induce early reproduction and improve pregnancy rate In racing horses.
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KEYWORD
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Thoroughbred mares, synchronization, $PGF_2{\alpha}$, altrenogest, estradiol, artificial illumination
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