Relationship between GnRH-induced LH increase profiles
Yoshimura, Naoaki Tokushima University
Morita, Yasuhiro Obihiro University of Agriculture and Veterinary Medicine
Yamamoto, Mitsuo Tokushima University
Higashine, Chika Tokushima University
Takebayashi, Koki Tokushima University
Kumegawa, Taichi Tokushima University
Higashiyama, Yoshimichi JTEKT Corporation
Niimi, Masatoshi JTEKT Corporation
This study aimed to investigate the relationship between increases in the luteinizing hormone (LH) profiles in the serum and vaginal mucus of cows induced by gonadotropin-releasing hormone (GnRH). Samples for LH determination were collected from Japanese Black beef cows during estrus, which was induced with a controlled internal progesterone-releasing device and the administration of cloprostenol immediately before GnRH administration and every 30 min from the start of GnRH administration until 6.5 h. The peak serum LH concentration was clearly identified at 2.5 h post-GnRH administration, with serum concentrations returning to near-pre-GnRH-administration values after 6.5 h, whereas the peak vaginal mucus LH concentration was identified 4.5 h after GnRH administration. These results indicate that the LH secretion peak in vaginal mucus appeared about 2 h after peak LH secretion in the serum.
Archives Animal Breeding
This work is distributed under the Creative Commons Attribution 4.0 License (https://creativecommons.org/licenses/by/4.0/).
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Bioscience and Bioindustry