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Estrus behavior and ovulation of beef heifers were investigated after injections of prostaglandin F<SUB>2α</SUB> (PGF<SUB>2a</SUB>). Eight Japanese Shorthorn and one Japanese Black heifers received intramuscular injec-tions with 5 mg of PGF<SUB>2α</SUB> per day in the morning of two successive days (Treatment I). Ten days later the same treatment was repeated and designated as treatment II. From the evening of the last injection of each treatment, behavioral estrus was assessed every two hours using a well trained bull until the end of estrus. The ovulation was judged by the rectal palpation at intervals of two hours after the disappearance of estrus behavior. The time of ovulation was estimated as one hour before the ovulation confirmed by the palpation. The time of the onset and end of estrus was defined at one hour before the first and one hour after the last estrus behavior. A heifer was considered to be in estrus when she showed the following behavior: (1) no refusal for being mounted, (2) she permitted chin-resting of the bull, (3) she permitted copulatory motion of the bull.<BR>The results showed that, the time interval from the last injection of PGF<SUB>2α</SUB> to estrus and ovula-tion became more uniform in treatment II than in treatment I, though the difference was not signifi-cant, and that estrus behavior and ovulation of beef heifers are much the same either induced by PGF<SUB>2α</SUB> or occurred naturally.
- 日本繁殖生物学会の論文
日本繁殖生物学会 | 論文
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