Conception rate in Holstein dairy cows having both normal sized follicles and cystic follicles at estrus
- K. Kaneko
DOIAbstract
Objective: To investigate the conception rate when cows showing clear signs of estrus and having both normal sized follicles and cystic follicles were artificially inseminated. Methods: Thirty parous Holstein cows showing clear signs of estrus and having both normal sized follicles (diameter <25 mm) and cystic follicles (diameter ≥25 mm) simultaneously in their ovaries were artificially inseminated. Changes in the ovaries were observed using real-time ultrasonography for 25 d after artificial insemination. The concentration of plasma progesterone (P4) was measured simultaneously to monitor the function of the corpus luteum. Results: The normal sized follicles ovulated in 21 out of 30 cows (ovulation rate: 70.0%), and 11 of these cows succes...
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