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Effects on Reproduction Efficiency of Estrous Status in Thoroughbred Mares During the Breeding Season  

양영진 (한국마사회)
조길재 (한국마사)
남치주 (서울대학교 수의과대학)
Publication Information
Journal of Veterinary Clinics / v.21, no.2, 2004 , pp. 115-121 More about this Journal
Abstract
The purpose of this study was to ascertain the breeding efficiency in Thoroughbred mare. A total of 106 mares were investigated for the status of follicle (462 cases), ovulation (179 cases) and pregnancy (346 cases). Of total examination, 46.8% was follicle measure to determine breeding time, and mating rate per cases examined was 39.9%. There was no correlation between reproductive results and size of follicles or endometrial edema or degrees of teasing alone. 143 cases were ovulated among 179 cases which were performed ovulation examination, and ovulation rate and fertilization rate per mating times were 79.9% and 39.0%, respectively. The use of hCG(human chorionic gonadotropin), to facilitate ovulation, presented to increase occurrence of double ovulations and twin fertilizations In conclusion, though more examination to estimate the optimal breeding time and higher mating rate was performed, fertilization rate per mating times was lower and then reproductive efficiency also became decreased. Therefore, it seemed that accurate examination of reproductive tracks, appropriate teasing programme and hCG administration before ovulation were of help to improve ovulation rate and fertilization rate.
Keywords
Estrous; teasing; breeding efficiency; Thoroughbred mare;
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  • Reference
1 Asbury AC. The essential elements of equine reproduction. The horse 1999; Feb: 81-86
2 Bowen JM. Management of the breeding stallion. In: Current therapy in theriogeno1ogy 2. Philadelphia: WB Saunders Company. 1986: 635-645
3 Honey PG. Management factors affecting equine fertility. In: Current therapy in theriogenology 2. Philadelphia: WB Saunders Company. 1986: 737-740
4 Jones WE. Genetic and horse breeding. Philadelphia: Lea & Febiger. 1982: 409-433
5 Roberts SJ. Gestation and pregnancy diagnosis in the mare. In: Morrow DA, Current therapy in theriogenology 2. Philadelphia: WB Saunders Company. 1986: 670-674
6 Rose RJ, Hodgson DR. Manual of equine practice. Philadelphia: W. B. Saunders Company. 1993: 250-274
7 Riegel RJ, Hakola SE. Illustrated atlas of clinical equine anatomy and common disorders of the horse. Marysville, Ohio: Equista publications, Ltd. 1999: 54-56
8 Woods GL, Hallowell AL. Management of twin embryos and twin fetuses in the mare. In: Equine reproduction. Philadelphia: Lea & Febiger. 1993: 532-535
9 Morel MD. Equine reproductive physiology, breeding and stud management. Wallingford, Oxon: CABI Publishing. 1999: 208-227
10 McDonald LE. Reproductive patterns of horses. In: Veterinary endocrinology and reproduction. Philadelphia: Lea & Febiger. 1989: 416-427
11 Bott R.M, Shambley MO, Bailey MT. Induction of ovulation in the mare with the synthetic GnRH analogue leuprolide. Equine practice 1996; 18: 30-33
12 Mills ML, Kraus-Hansen AE, Brown DW. Ovarian Hematoma as a cause of small colon obstruction in a six-month-old foal. Equine practice 1996; 5: 25-27
13 Morris LHA, Allen WR. Reproductive efficiency of intensively managed Thoroughbred mares in Newmarket. Equine vet J 2002; 34: 51-60   DOI   ScienceOn
14 Sellnow L. Teasing. The horse 1999: 49-56
15 Rossdale PD. Hprse breeding, 4th ed. Newton Abbot, London: David & Charlse. 1986: 258-260
16 Reimer JM, Riddle WT. The reproductive system. In: Atlas of equine ultrasonography. St. Louis: Mosby. 1998: 243-297
17 Bristol F. Estrous synchronization in mare. In: Current therapy in thenogenology 2. Philadelphia: WB Saunders Company. 1986: 661-664
18 Daels PF, Hughes JP. The nonnal estrus cycle. In: Equine Reproduction. Philadelphia: Lea & Febiger. 1993: 121-132
19 Mckinnon AO, Voss JL, Squires EL, Carnevale EM. Diagnostic Ultrasonography. In: Equine Reproduction. Philadelphia: Lea & Febiger. 1993: 266-302
20 Pineda MH. Female reproductive system. In: Veterinary endocrinology and reproduction. Philadelphia: Lea & Febiger. 1989: 303-354
21 England GCW. Allen's fertility and obsterics in the horse, 2nd ed. Osney Mead, Oxford: Blackwell Science. 1996: 1-52