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KMID : 1005220000150010077
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Journal of Embryo Transfer
2000 Volume.15 No. 1 p.77 ~ p.83
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Studies on Development of Breeding Technique to Increase Hanwoo(Bos taurus coreanae) I. Survey of Reproductive Status and Effect of Intraovarian PGF₂α Administration on Luteolysis and Subsequent Estrus Induction
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Lee Byeong-Chun
Lee Kang-Nam
Lee Eun-Song
Son Chang-Ho
Ryu Il-Sun
Choi Sang-Yong
Rho Gyu-Jin
Oh Sung-Jong
Jung Keun-Ki
Kim Sang-Cheol
Kim Kye-Seong
Joo Suk-Chun
Lim Jeong-Mook
Jang Goo
Hwang Woo-Suk
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Abstract
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The purpose of this study was to develop a breeding technique to increase Hanwoo of superior characteristics. In the present study, reproductive status of Hanwoo such as size of farm, breeding system and gestationi length was investigated. In addition, effect of low dose administration of prostaglandin F₂ αα (PGF₂ α ) on luteolysis was examined. The size of farm was classified by the total number of cows and the number of breeding stocks, respectively. The distribution of herd size of heads was 31%, 15%, 39%, 4% and 11%, respectively. Furthermore, the distribution of breeding stock size of 50 heads was 36%, 28%, 31%, 3% and 3%, respectively. Average parity was 2.1 in breeding stock. In breeding pattern, artificial in semination(A.I), estrus synchronization-A.I and natural mating was 92.7%, 2.4% and 4.9% respectively. Gestational length of Hanwoo was ranged 253~316 days (average length : 285 days) after estrus( estrus=0). To induce luteolysis, PGF₂α was injected into ovarian parenchyma by a modified ovarian injector. The effect of administration of 6mg PGF₂ α on luteolysis and estrus induction was betweer (P αα was administered into ovarian parechyma than when administered intramuscluarly (71 vs. 91%). When PGF₂α was injected into ovarian parenchyma, a decreased concentration to 3 mg did not significantly decreaed its luteolytic effect(92%). When AI was performed following PGF₂ α treatment, the intraovarian injection group yielded a higher pregnancy rate(69 vs. 88%) than the IM injection groups, regardless of the dosage. In conclusion these results suggest that increasing herd size and regular reproductive management are needed to improve reproductive efficiency in Hanwoo industry. Furthermore, intraovarian administration of PGF₂ α is effective way to induce luteolysis compared with intramuscular injection.
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KEYWORD
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Hanwoo, herd size, breeding control, PGF2α, intraovarian injection
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