Follicular Turnover and Hormonal Association in Postpartum Goats During Early and Late Lactation
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概要
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To clarify the effect of lactation period on ovarian follicular activity and associated hormonal levels in goats, six goats were monitored daily by ultrasonographic examination with blood sampling during early (Days 5 to 25; Day 0 was the day of kidding) and late (Days 40 to 60) lactation. While the presence of a corpus luteum of pregnancy retarded follicular growth in the ipsilateral ovary until Days 11-13 postpartum, the total follicular number (TFN) and area (TFA) increased during late lactation due to the significant increase in the number of medium- and large-sized follicles and decrease in the number of small follicles. Four goats showed a similar pattern of follicular development during the period studied characterized by the emergence of five and six waves during the early and late lactation, respectively. The largest follicle diameter of the first three waves monitored during early lactation was significantly smaller as compared with the diameter of those existing during late lactation. TFN showed a positive correlation with FSH but showed a negative correlation with immunoreactive (ir-) inhibin and estradiol during the postpartum period. TFA was positively correlated with ir-inhibin, estradiol and PRL and negatively correlated with FSH during the monitored periods. The plasma levels of ir-inhibin and progesterone were significantly higher during late lactation compared with the levels recorded during early lactation. Ir-inhibin levels showed a significant positive correlation with LH and estradiol during early and late lactation but showed a negative correlation with FSH during the whole lactation period. LH was positively correlated with estradiol and PRL during early and late lactation, respectively. These results suggest that the lactation period has a detrimental effect on ovarian activity during the early postpartum period in goats.
著者
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Watanabe G
Laboratory Of Veterinary Physiology Department Of Veterinary Medicine Faculty Of Agriculture Tokyo U
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Taya Kazuyoshi
Laboratory Of Veterinary Physiology Department Of Veterinary Medicine Faculty Of Agriculture Tokyo U
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Abou El-roos
Department Of Theriogenology Faculty Of Veterinary Medicine Benha University
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Sosa Gamal
Department Of Theriogenology Faculty Of Veterinary Medicine Benha University
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El Azab
Department Of Theriogenology Faculty Of Veterinary Medicine Benha University
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Manabe Noboru
Animal Resource Center The University Of Tokyo:research Center. For Food Safety The University Of To
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Kandiel Mohamed
Laboratory Of Veterinary Physiology Department Of Veterinary Medicine Faculty Of Agriculture Tokyo U
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Kandiel Mohamed
東京農工大学 農学部獣医学科獣医生理学
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Abdel-ghaffar Alaa
Department Of Theriogenology Faculty Of Veterinary Medicine Benha University
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El-azab Abd
Department Of Theriogenology Faculty Of Veterinary Medicine Benha University
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Nagaoka Kentaro
Laboratory Of Animal Breeding Faculty Of Agriculture The University Of Tokyo
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Watanabe Gen
Laboratories Of Veterinary Physiology Dep. Of Veterinary Medicine Fac. Of Agriculture Tokyo Univ. Of
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Li Jun
Animal Resource Science Center Graduate School Of Agriculture And Life Science University Of Tokyo
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Abou-el-roos Mahmoud
Department Of Theriogenology Faculty Of Veterinary Medicine Benha University
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WATANABE Gen
Laboratory of Veterinary Physiology, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology, Tokyo 183-8509, Japan
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MANABE Noboru
Animal Resource Science Center, Graduate School of Agriculture and Life Science, University of Tokyo, Ibaraki 319-0206, Japan
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EL-AZAB Abd
Department of Theriogenology, Faculty of Veterinary Medicine, Benha University, Kaliobia, Egypt
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KANDIEL Mohamed
Laboratory of Veterinary Physiology, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology, Tokyo 183-8509, Japan
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LI Jun
Animal Resource Science Center, Graduate School of Agriculture and Life Science, University of Tokyo, Ibaraki 319-0206, Japan
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ABDEL-GHAFFAR Alaa
Department of Theriogenology, Faculty of Veterinary Medicine, Benha University, Kaliobia, Egypt
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TAYA Kazuyoshi
Laboratory of Veterinary Physiology, Department of Veterinary Medicine, Faculty of Agriculture, Tokyo University of Agriculture and Technology, Tokyo 183-8509, Japan
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NAGAOKA Kentaro
Laboratory of Animal Breeding and Reproduction, University of Tokyo, Tokyo 113-8657, Japan
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Nagaoka Kentaro
Laboratory of Animal Breeding and Reproduction, University of Tokyo
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