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- 저자 : 신영수(Y . S . Sin) (검색결과 3 건)
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국내 Holstein 종의 유생산에 미치는 환경효과 보정계수 추정
고문석(M . S . Ko),이학교(H . K . Lee),신영수(Y . S . Sin),조윤연(Y . Y . Cho),김내수(N . S . Kim) 한국축산학회 1989 한국축산학회지 Vol.31 No.11
This study was carried out to estimate the coefficients for the adjustment of environmental effects on milk yield. The 2,438 lactation records of Holstein Cows which had raised at National Animal Breeding Institute from (1969 to 1985 were used in this analysis. The parities, the season within parity and the month of age within parity at parturition of cows were included to the environmental factors for the adjustment. 1. The parity, season and year showed highly significant(p (0.01) effects on milk yield. 2. The total milk yield of the season Ⅰ (Nov.-Apr.) appeared about 300㎏ higher than those of the season Ⅱ (May.-Oct.) within each parity. The coefficients for the season`s were estimated on the basis of the season Ⅰ . The factors for season 11 were 1.09, 1.07 and 1.04, in 1st, 2nd and 3rd to 4th parity, respectively. 3. The adjustment factors on different parities were 1.00, 0.932 and 0.817 on the basis of the first parity and 1.147, 1.069 and 1.00 on the basis of the third and fourth parity. 4. The linear regression of milk yield for ages at calving were estimated Y₁= 2,272.6 + 72.7 X₁,Y₂= 3,701.0 + 23.5 X₂, Y₃= 3,827.3 + 19.3 X₃, in 1st, 2nd and 3rd and 4th parity respectively. The adjustment factors were made on the basis of 26 month for the first parity and it ranges from 1,024 at 24 month to 0.85 at 36 month. The factors for 2nd parity which ranged from 1.03 at 34 month to 0.93 at 54 month were based on 40 month and those of third and fourth parity which ranged from 1.05 at 46 month to 0.93 at 77 month were based on 59month. 5. The milk yield adjusted by proposed factors were estimated 5,011㎏ for the first parity, 5,087㎏ for the second and 5,018㎏ for the third and fourth. On the other hand when same data were adjusted by DHIA factors the milk yield were estimated 5,384㎏, 5,167㎏ and 5,072㎏ respectively. This showed that the proposed factors adjusted raw data more uniformly among parities than those of DHIA factors.
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유우의 산유량과 번식능력에 대한 유전적 모수추정에 관한 연구
이학교(H . K . Lee),신영수(Y . S . Sin),조윤연(Y . Y . Cho),오봉국(B . K . Ohh) 한국축산학회 1988 한국축산학회지 Vol.30 No.11
This study was carried out to estimate heritabilities, phenotypic and genetic correlations among various economic traits. Data used in this study included a total of 783 lactation records of Holstein cows (First 419, Second parity 364) which were raised in the National Animal Breeding Institute from 1970 to 1985. 1. In the average performance of each trait; total milk yield was 4486 ± 1182 ㎏, 305 D milk yield 5178 ± 1145 ㎏, Annualized milk yield 3860 ± 1000 ㎏, services per conception 1.95 ± 1.27, day open 119.9 ± 58.5 day in first parity, and total milk yield was 4866 ± 1183 ㎏, 305 D milk yield 5427 ± 1085, annualized milk yield 4237 ± 1089 ㎏, services per conception 2.04 ± 1.50, day open 119.1 ± 71.2 day in second parity. There was significance of 5% level between first parity milk yield and second parity milk yield. 2. The heritabilities estimated from sire component were 0.11, 0.28, for the total milk yield, 0.29 and 0.19 for the 305 day corrected milk yield, 0.12 and 0.10, for the annualized milk yield for each lactation set. Estimates of heritability were 0.05 and 0.08 for the services per conception, 0.07 and 0.03 for the day open, respectively. 3. In the each lactation set, genetic and phenotypic correlations of services per conception with 305 D milk yield were 0.31, 0.08 and 0.03, -0.01, with total mild yield 0.06, 0.52 and 0.49, 0.47, with annualized milk yield 0.15, -0.41 and 0.09, -0.41. The genetic correlations of day open with total milk yield were 0.06 and 0.47, day open with 305 D milk yield 0.16 and 0.08, day open with annualized milk yield 0.20 and 0.01 for each lactation set`, respectively. Phenotypic correlations of day open were measured to be 0.52 and 0.47 with total yield, 0.50 and 0.47 with 305 D milk yield, -0.71 and -0.52 with annualized milk yield for each lactation set.
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혼합모형식에서 Pseudo - REML 방법을 이용한 유우의 비유형질에 대한 분산성분 및 유전모수 추정
이득환(D . H . Lee),오봉국(B . K . Ohh),신영수(Y . S . Sin),이학교(H . K . Lee) 한국축산학회 1991 한국축산학회지 Vol.33 No.3
Variance components and genetic parameters for first lactation were estimated using Schaeffer`s Pseudo-REML method in mixed model equation(MME). Variance components were estimated with the data of 596 First lactation records which had been gathered at the National Animal Breeding Institute from 1970 to 1988. Analyzed traits were 305-day milk yield, fat yield and fat percentage. Iteration numbers for estimation were 42, 29, and 31 at milk yield, fat yield and fat percentage in convergence criteria of 1 × 10^-5, respectively. Heritabilities estimated from sire variance components in mixed model equation were 0.333, 0.245, and 0.178 for milk yield, fat yield and fat percentage, respectively. Estimates of genetic correlation were 0.782 between milk yield and fat yield. -0.596 between milk yield and fat percentage. and 0.086 between fat yield and fat percentage.
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