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KMID : 1023620130370010029
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Reproductive and Developmental Biology
2013 Volume.37 No. 1 p.29 ~ p.33
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Changes in Concentrations of Reproductive Hormones during Estrus Synchronization in Dairy Heifers
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Choe Chang-Yong
Hur Tai-Young
Jung Young-Hun
Cho Yong-Il
Baek Kwang-Soo
Jung Yeon-Sub
Han Tai-Seok
Lee Gyoung-Suk
Kwon Eung-Gi
Kang Da-Won
Son Jun-Kyu
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Abstract
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The objective of this work was to analyze the concentrations of progesterone (P4) and estrogen (E2) hormones changed during estrus synchronization in dairy heifers. Estrus synchronization was carried out with CIDR^(R) (Controlled Intravaginal Drug Release) devices. Corpus luteum (CL) was classified into three grades based on its size and palpable characteristics. The concentrations of P4 and E2 were measured by enzyme-amplified chemiluminescence. Serum P4 concentration was markedly low at the estrus stage (36 hrs after removal of CIDR) compared to other stages, while E2 concentration was kept high during estrus stage. The serum P4 concentration was highest in the CL classified into grade I. These results indicate that P4 concentration could be used as a criteria for determining recipients for artificial insemination or embryo transfer in dairy cattle.
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KEYWORD
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Estrus synchronization, Dairy cattle, P4, E2, Corpus luteum
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