Effect of Active Immunization of Pony Mares against Recombinant Porcine Inhibin α Subunit on Ovarian Follicular Development and Plasma Steroids and Gonadotropins

Refaat Ibrahim DERAR, Yoshihisa MAEDA, M Shafiqul HOQUE, Takeshi OSAWA, Gen WATANABE, Kazuyoshi TAYA, Yoh-Ichi MIYAKE
2004 Journal of Veterinary Medical Science  
Two pony mares were immunized against recombinant porcine inhibin α subunit three times with 39 day intervals. Clinical findings and endocrinological changes before immunization were taken as the control. The first significant rise in the anti-inhibin titre (P<0.05) in the circulation was found 27 days after the first injection. Maximum binding activity was reached by the 12th day after the second booster dose. The number of small, medium and large sized follicles had increased significantly
more » ... ed significantly compared to before immunization (11.75 ± 4.30, 2.75 ± 0.69 and 2.51 ± 0.63 vs 6.50 ± 1.43, 1.83 ± 0.44 and 1.33 ± 0.38, respectively), but the ovulation rate remained unchanged after immunization. The average plasma concentration of FSH and estradiol-17β during the estrous cycle increased significantly (P<0.05) after immunization. These results suggest that immunization against inhibin is a useful tool to increase the number of ovarian follicles during the estrous cycle of pony mares. Moreover, the present study supported the concept that inhibin plays a major role in the control of follicular growth through its inhibitory effect on FSH secretion synergistically with steroid hormones. KEY WORDS: follicular development, FSH, immunization, inhibin, mare.
doi:10.1292/jvms.66.31 pmid:14960807 fatcat:urod7fpkqfdsnmaocck4cd5m3e