Effects of Litter Size on Gestation Length and Plasma Progesterone Concentration in Mongolian Gerbils (Meriones unguiculatus)
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- KAI Osamu
- College of Bioresource Sciences, Nihon University
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- SONODA Yutaka
- College of Bioresource Sciences, Nihon University
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- SENSUI Naoto
- College of Bioresource Sciences, Nihon University
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- IMAI Kiyoshi
- College of Bioresource Sciences, Nihon University
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A total of 31 female Mongolian gerbils (19-54 weeks of age at mating) were used for this study. The mean litter size at birth in all females was 4.4±0.3, ranging 1 to 8 pups. Although maternal age did not affect to litter size and gestation length, litter size did significantly to gestation length. Plasma progesterone (P4) was measured in serial blood samples collected every 3 days throughout gestation period. The P4 concentration increased rapidly after mating, reaching a peak level on day 6 of gestation, maintained the high level to day 12 of gestation, then decreased to a moderate level and sustained at the level until day 21. The P4 concentration decreased to a lowest level on day 24 of gestation (mean gestation length: 25.2 days). Females having a large number of litter size tended to reveal higher level of P4 during gestation, comparing with that females having a fewer litter size, and significant differences between them were found on days 6 and 9 of gestation. There were significant differences in P4 levels among 3 groups according to gestation length, resulting in lower P4 level from females with longer gestation length. Therefore, difference of plasam P4 level during the gestation is due to litter size.
収録刊行物
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- 日本畜産学会報
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日本畜産学会報 70 (1), 18-23, 1999
公益社団法人 日本畜産学会
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詳細情報 詳細情報について
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- CRID
- 1390001205196643328
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- NII論文ID
- 10021724338
- 10020393563
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- NII書誌ID
- AN00195188
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- ISSN
- 18808255
- 00215309
- 1346907X
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- NDL書誌ID
- 4672506
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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
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可