1Department of Theriogenology, Faculty of Agriculture, Iwate University, 0208550, Morioka, Japan Department of Animal Science, Faculty of Veterinary Medicine, South Valley University, 83523, Qena, Egypt
2Department of Theriogenology, Faculty of Agriculture, Iwate University, 0208550, Morioka, Japan
Receive Date: 07 February 2012,
Revise Date: 05 October 2012,
Accept Date: 01 November 2012
The present study aimed to evaluate the effect of kisspeptin-10 (Kp10), a shorter variant of kisspeptin retaining full biological activity, on the release of luteinizing hormone (LH) and follicle stimulating hormone (FSH) in cyclic adult cows, and the effect of plasma progesterone (P4)concentration on the response to Kp10 administration. The experiments were performed using five postpartum cows (4-5 years old) treated with a progesterone-releasing intravaginal device (PRID) for 7 days. The animals received a single intravenous (i.v.) injection of Kp10 (5 μg/kg b.w.: 3.85 nmol/kg b.w.) for three consecutive days after the device’s removal. Plasma concentrations of P4 were higher on the day of the PRID’s removal (day 0: 7.3±1.1 ng/mL) than 1 (day 1: 0.8±0.1 ng/mL) and 2 (day 2: 0.6±0.1 ng/mL) days later (P<0.05). Kp10 did not alter plasma LH concentrations significantly at day 0. However, it significantly stimulated the release of LH on day 1 and day 2 (P<0.05). Kp10 tended to stimulate the release of FSH at day 2; however, it did not alter the concentrations of FSH in plasma significantly throughout the experiment. The results showed that Kp10 stimulates the release of LH in postpartum cyclic cows, and suggested that high concentrations of P4 inplasma may reduce the effect of kisspeptin on the secretion of gonadotropins.
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