Journal of Embryo Transfer (한국수정란이식학회지)

The Korean Society of Embryo Transfer (한국수정란이식학회)
권호 표지

Synchronization of Estrus in Thoroughbred Mares

더러브렛종 암말의 발정 동기화

  • Son, D.S. (National Livestock Research Institute, RDA) ;
  • Lee, C.S. (Surabol Vet. Clinc) ;
  • Seo, J.H. (J Equine Clinc) ;
  • Ko, J.H. (Woori Pet Hospital) ;
  • Cho, C.Y. (National Livestock Research Institute, RDA) ;
  • Choe, C.Y. (National Livestock Research Institute, RDA) ;
  • Choi, S.H. (National Livestock Research Institute, RDA) ;
  • Kim, H.J. (National Livestock Research Institute, RDA) ;
  • Hur, T.Y. (National Livestock Research Institute, RDA) ;
  • Suh, G.H. (National Livestock Research Institute, RDA) ;
  • Ryu, I.S. (National Livestock Research Institute, RDA) ;
  • Kim, M.C. (College of Veterinary Medicine, Chungnam National University) ;
  • Choe, S.Y. (College of Veterinary Medicine, Gyeongsang National University)
  • Published : 2007.03.31
Download PDF
⟨ Previous Next ⟩

Abstract

The objective of this study was to improve the reproductive ability of Thoroughbred mares with artificial estrous regulation by hormone treatments and artificial illumination. The results were as follows; Estrous detection in cycling mares which were treated $PGF_2{\alpha}$ or altrenogest administration was all 100%, and pregnancy rates were 95.2% and 71.4%, respectively. Estrous detection was 100% within March when altrenogest was administered alone or together with estradiol for non-pregnant mares in the previous year. Interval to estrous detection after altrenogest administration was 4.3 days in single administration of altrenogest and 3.7 days in combined administrations of altrenogest and estradiol, respectively Interval to ovulation after estrous detection were 2.7 and 2.5days, respectively. Pregnancy rate following single altrenogest administration was 80.0%. Estrous detection and pregnancy rates by artificial illumination in non-pregnant mares were 92.9% and 46.9%, respectively. These results show that estrous synchronization of mares during breeding season will be able to improve the pregnancy rate, and altrenogest administration in non-pregnant mares in the previous year will be able to induce early reproduction and improve pregnancy rate In racing horses.

더러브렛종 암말의 번식 능력을 향상시키기 위해 호르몬 투여 및 인공 조명에 의한 인위적으로 발정 조절을 실시한 결과는 다음과 같다. 발정 주기에 있는 암말의 $PGF_2{\alpha}$ 또는 altrenogst투여에 의한 발정 발현율은 100%이었으며, 수태율은 각각 95.2% 및 71.4%였다. 전년도 공태마에 대하여 altrenogest단독 또는 altrenogest과 estradiol 병행 투여시 3월 이내 100% 발정이 발현되었으며, 발정 발현일은 altrenogest 투여 종료 후 단독 투여군이 4.3일, estradiol 병행 투여군이 3.7일이었고, 배란일은 발정 발견 후 각각 2.7일과 2.5일이었고, 처리군간의 유의적인 차이는 없었다. 그리고 수태율은 altrenogest 단독 투여군이 80.0%를 나타내었다. 인공 조명에 의한 발정 발현율은 92.9%였고 수태율은 76.9%였다. 이상의 결과로 보아 번식 계절에 있는 암말에 대한 발정 동기화는 수태율을 높일 수 있는 수단으로 활용될 수 있고, 전년도 비임신으로 공태중인 암말에 altrenogest 투여는 경주마의 조기 번식 및 수태율 향상에 기여할 수 있을 것으로 사료 된다.

Keywords

References

  1. Bain AM. 1957. Estrus and infertility of the Throughbred mare in Austrailia. J. M. Vet. Med. Asso., 131:179-185
  2. Blanchard TL, Varner DD, Bums PJ, Everett KA, Brinsko SP and Boehnke L. 1992. Regulation of estrus and ovulation in mares with progesterone or progesterone and estradiol biodegradable micro spheres with or without $PGF_2{\alpha}$. Theriogenology, 38:1091-1106 https://doi.org/10.1016/0093-691X(92)90123-9
  3. Bristol F. 1986. Estrous synchronization in mares. In: Morrow DA, Current therapy in Theriogenology 2. W.B. Saunders Company, Pennsylvania. pp. 661-664
  4. Hutten CA and Meacham TN. 1968. Reproductive efficiency on fourteen horse farms. J. Anim. Sci., 27:434-438 https://doi.org/10.2527/jas1968.272434x
  5. Hyland JH and Bristol F. 1979. Synchronization of oestrous and timed Insemination of mares. J. Reprod. Fert., 27:251-255
  6. Keiper R and Houpt K. 1984. Reproduction in feral horses: an eight-year study. Am. J. Vet. Res., 45:991-995
  7. Lofstedt RM and Patel JH. 1989. Evaluation of the ability of altrenogest to control the equine estrous cycle. J. Am. Vet. Med. Assoc., 194:361-364
  8. Loy RG, Buell JR, Stevenson W and Hamm D. 1979. Sources of variation in response intervals after prostaglandin treatment in mares with functional corpora lutea. J. Reprod. Fert., Suppl. 27:229-235
  9. Nelson EM, Kiefer BL, Roser JF and Evans JW. 1985. Serum estradiol-17 $\beta$ concentrations during spontaneous silent estrus and after prostaglandin treatment in the mare. Theriogenology, 23:241-262 https://doi.org/10.1016/0093-691X(85)90028-7
  10. Osborne VE. 1975. Factors influencing foaling percentages in Australian mares. J. Reprod. Fert., Suppl. 23:477-483
  11. Palmer E. 1979. Reproductive management of mares without detection of oestrus. J. Reprod. Fertil., Suppl. 27:263-270
  12. Sharp DC, Kooistra L and Ginther OJ. 1975. Effects of artificial light on the oestrous cycle of the mare. J. Reprod. Fertil., Suppl. 23:241-246
  13. Sigler DH, Ericson DE, Gibbs PG, Kiracofe GH and Stevenson JS. 1989. Reproductive traits, lactation and foal growth in mares fed altrenogest. J. Anim. Sci., 67:1154-1159 https://doi.org/10.2527/jas1989.6751154x
  14. Squires EL. 1993. Use of progestins in open and pregnant mares. Anim. Reprod. Sci., 33:183-193 https://doi.org/10.1016/0378-4320(93)90114-7
  15. Webel SK and Squires EL. 1982. Control of the estrus cycle in mares with altrenogest. J. Reprod. Fert., Suppl. 32:193-198
  16. Wiepz GJ, Squires EL and Chapman PL. 1988. Effects of norgestomet, altrenogest, and/or estradiol on follicular and hormonal characteristics of late transitional mares. Theriogenology, 30:181-193 https://doi.org/10.1016/0093-691X(88)90275-0
  17. 양영진, 조길재, 남치주 2004a. 제주지역 더러브렛 말의 번식 특성 조사. 대한수의학회지. 44:105-111
  18. 양영진, 조길재, 남치주. 2004b. 더러브렛 암말의 번식기 발정 상태가 번식효율에 미치는 영향. J. Vet. Clin., 21:115-121
  19. 한국마사회 말혈통 정보 http://studbook.kra.co.kr/html/data/stati/s_count_reg.jsp