Relationship between the First Ovulation within Three Weeks Postpartum and Subsequent Ovarian Cycles and Fertility in High Producing Dairy Cows
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- KAWASHIMA Chiho
- Graduate School of Animal and Food Hygiene, Obihiro University of Agriculture and Veterinary Medicine
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- KANEKO Etsushi
- Graduate School of Animal and Food Hygiene, Obihiro University of Agriculture and Veterinary Medicine
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- AMAYA MONTOYA Carlos
- Department of Clinical Veterinary Science, Obihiro University of Agriculture and Veterinary Medicine
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- MATSUI Motozumi
- Department of Clinical Veterinary Science, Obihiro University of Agriculture and Veterinary Medicine
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- YAMAGISHI Norio
- Research Center for Animal Hygiene and Food Safety, Obihiro University of Agriculture and Veterinary Medicine Research Unit for Diagnosis and Treatment of Food Animal Diseases, Department of Veterinary Clinical Medicine, Faculty of Agriculture, Iwate University
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- MATSUNAGA Nobuyoshi
- Department of Agricultural and Life Science, Obihiro University of Agriculture and Veterinary Medicine
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- ISHII Mitsuo
- Research Center for Animal Hygiene and Food Safety, Obihiro University of Agriculture and Veterinary Medicine
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- KIDA Katsuya
- Field Center of Animal Science and Agriculture, Obihiro University of Agriculture and Veterinary Medicine
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- MIYAKE Yoh-Ichi
- Department of Clinical Veterinary Science, Obihiro University of Agriculture and Veterinary Medicine
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- MIYAMOTO Akio
- Graduate School of Animal and Food Hygiene, Obihiro University of Agriculture and Veterinary Medicine
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説明
The aim of this study was to investigate the relationship between the first ovulation within 3 weeks postpartum and subsequent ovarian cycles and fertility in high producing dairy cattle in Hokkaido, Japan. In Experiment 1, 110 cows (44 primiparous and 66 multiparous) were used to determine the effects of the first ovulation within 3 weeks postpartum on subsequent ovarian cycles. Milk samples were collected twice weekly from 7 to 100 days postpartum. The first ovulation was identified by an increase in milk progesterone (P4) to more than 1 ng/ml within 3 weeks postpartum. The numbers of cows showing ovulation and anovulation within 3 weeks postpartum were 31 (70.5%) and 13 (29.5%) in the primiparous cows and 35 (53.0%) and 31 (47.0%) in the multiparous cows, respectively. The patterns of ovarian resumption after calving were classified into two types (normal ovarian cycles and abnormal ovarian cycles) on the basis of milk P4 concentrations. Initiation of normal ovarian function in cows ovulated within 3 weeks postpartum occurred earlier than in anovulated cows regardless of the number of calvings (primiparous, 27.8 days vs. 44.4 days; multiparous, 30.6 days vs. 55.7 days; P<0.01). Out of the multiparous cows that ovulated within 3 weeks postpartum, initiation of normal ovarian function followed by a normal luteal phase was earlier than when it was followed by an abnormal luteal phase (25.5 days vs. 40.4 days; P<0.05). Milk P4 concentrations after the first ovulation were lower than those after the second ovulation in both the primiparous and multiparous cows (P<0.05). In Experiment 2, 22 multiparous cows were used to determine the effects of the first ovulation within 3 weeks postpartum on subsequent fertility. Blood samples were collected once a week from 0 to 3 weeks postpartum. The interval from parturition to first service in ovulated cows was shorter than in anovulated cows (68.4 days vs. 94.8 days; P<0.05). The conception rate by 100 days after calving tended to be higher in ovulated cows than in anovulated cows (50.0% vs. 16.7%, P=0.09). In conclusion, our data strongly suggests that ovulation within 3 weeks postpartum is a crucial phenomenon for subsequent resumption of ovarian function and conception, and thus it can be used as an index of subsequent reproductive performance.<br>
収録刊行物
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- Journal of Reproduction and Development
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Journal of Reproduction and Development 52 (4), 479-486, 2006
公益社団法人 日本繁殖生物学会
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詳細情報 詳細情報について
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- CRID
- 1390282681313148288
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- NII論文ID
- 10020351492
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- NII書誌ID
- AA10936678
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- COI
- 1:STN:280:DC%2BD28rht1WhsQ%3D%3D
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- ISSN
- 13484400
- 09168818
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- NDL書誌ID
- 8019724
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- PubMed
- 16627955
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- IRDB
- NDL
- Crossref
- PubMed
- CiNii Articles
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- 使用不可