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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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