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- W2325011950 abstract "The relationship between estrous behavior and steroid hormones of cows and a heifer was stud-ied. Two cows and a heifer were examined visually on their estrous behavior from the beginning to the end of estrus. Blood was collected via coccygeal vessel from two cows and a heifer every four hours. Serum testosterone (T), estradiol-17β (E2-17β), cortisol (F), dehydroepiandrosterone (DHEA), dehydroepiandrosterone sulfate (DHEA-S) and progesterone (P) levels were measured by radioimmu-noassay.The results obtained were as follows:1. In the two cows, mounting behavior was found more often during the early stage than the late stage of estrus. Standing behavior was found more often during the late stage than the early stage of estrus.2. The highest T level was detected before the beginning of estrous behavior in two cows. This incresse of T level seemed to be a trigger of onset of estrous behavior. 3. The DHEA-S level increased during estrus and remained at a high level till the time of ovula-tion.4. The F level was high from the beginning to the end of estrous behavior, and decreased after the end of estrous behavior.5. There were no significant changes in the E2-17β and P levels in these animals throughout the experimental periods." @default.
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- W2325011950 date "1982-01-01" @default.
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- W2325011950 title "Relationship between estrous behavior and steroid hormones in dairy cattle." @default.
- W2325011950 doi "https://doi.org/10.1262/jrd1977.28.76" @default.
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