Superovulatory Response during the Period of Decrease in the Number of Ultrasonographically Identified Follicles in Postpartum Beef Cows

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概要

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• The number of follicles more than 4 mm in size in the ovaries of 2 Japanese Black cows was determined by ultrasonography from 14 to 147 days after parturition. We found that the number of ultrasonographically identified follicles (uiFOL) with a diameter of 4 mm or more mark-edly decreased at about 92 days postpartum. We measured the number of uiFOL in 7 cows from 14 to 98 days postpartum and conducted superovulatory treatment with follicle stimulating hor-mone (FSH-P) at 95-98 days postpartum. The number of uiFOL decreased similarly at about 92 days after parturition, and that of recovered and transferable embryos was 17.7 ± 5.3 and 11.9 ± 4.4, respectively. The results suggest that it is preferable to start superovulatory treatment in the period when the number of uiFOL decreases. It is also important to examine whether these results can be applied to other periods excepting the period (92-98 days postpartum) in which the uiFOL de-creases in number. We measured both the number of uiFOL at the beginning of superovulatory treatment and that of recovered transferable embryos in 10 cows at more than 120 days postpartum. As a result, the coefficiency of correlation (r) obtained was 0.319, indicating that there was no correlation between the number of uiFOL and that of transferable embryos. This suggested that the number of uiFOL at the time of superovulatory treatment did not influence the yield of transferable embryos, except for the period (92-98 days postpartum) in which the uiFOL decreases in number.

• 日本繁殖生物学会の論文

著者

• SATO Noriyuki

  Department of Pathology (Section 1), Sapporo Medical University School of Medicine

• KIKUCHI Kokichi

  Department of Pathology, Sapporo Medical University

• SAHARA Hiroeki

  Marine Biomedical Institute, Sapporo Medical University School of Medicine

• TAKAHASHI Nobuaki

  Marine Biomedical Institute

• Sato Noriyuki

  Department Of Orthopedic Surgery Sapporo Medical University School Of Medicine

• Kikuchi Kokichi

  Department Of Pathology (section 1) Sapporo Medical University School Of Medicine

• Sahara Hiroeki

  Marine Biomedical Institute Sapporo Medical University School Of Medicine

• EZOE Kanta

  Chubu Shiryo Co.

• FUKUOKA Hideo

  Department of Biology, Azabu University

• Fukuoka Hideo

  Department Of Biology Azabu University

• SHIMURA Osamu

  Chubu Shiryo Co., Shiraoi Farm

• SUZUKI Terashi

  Chubu Shiryo Co., Shiraoi Farm

• Sato Noriyuki

  Department Of Biological Chemistry Faculty Of Agriculture Yamaguchi University

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