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1 Department of Clinical Veterinary Science2 Graduate School of Animal and Food Hygiene3 Department of Agricultural and Life Science4 Field Centre of Animal Science and Agriculture, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Japan5 Department of Veterinary Medicine, Faculty of Agricultural Science, Yamaguchi University, Yoshida 1677-1, Yamaguchi 753-8515, Japan
(Correspondence should be addressed to H Kadokawa; Email: hiroya{at}yamaguchi-u.ac.jp)
* (H Kadokawa and M Matsui contributed equally to this work) This study was conducted to estimate the effects of kisspeptin-10 on blood concentrations of LH and GH in prepubertal dairy heifers. Heifers received a single injection of 1 mg kisspeptin-10 (n=5) or saline (n=5) intravenously, and serial blood samples were collected at 15-min intervals to analyze the response curves of both LH and GH after injection. Peak-shaped responses were observed for concentrations of LH and GH, and the peaks were observed at 27±3 and 75±9 min, respectively, after injection, only in heifers injected with kisspeptin-10. These data suggest various possible important links among kisspeptin, the reproductive axis, and also the somatotropic axis in prepubertal Holstein heifers.
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