지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2013.1
- 수록면
- 7 - 11 (5page)
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초록· 키워드
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The purpose of this study was to estimate (co)variance components of three milk production traits for genetic evaluation using a multiple lactation model. Each of the first five lactations was treated as different traits. For the parameter estimation study, a data set was set up including lactations from cows calved from 2001 to 2009. The total number of raw lactation records in first to fifth parities reached 1,416,589. At least 10 cows were required for each contemporary group, herd-year-season effect. Sires with fewer than 10 daughters were discarded. Lactations with 305d milk yield exceeding 15,000 kg were removed. In total, 1,456 sires of cows were remained after all the selection steps. A complete pedigree consisting of 292,382 records was used for the study. A sire model containing herd-year-season, caving age, and sire additive genetic effects was applied to the selected lactation data and pedigree for estimating (co)variance components via VCE. Heritabilities and genetic or residual correlations were then derived from the (co)variance estimates using R package. Genetic correlations between lactations ranged from 0.76 to 0.98 for milk yield, 0.79~1.00 for fat yield, 0.75~1.00 for protein yield. On individual lactation basis, relatively low heritability values were obtained 0.14~0.23, 0.13~0.20 and 0.14~0.19 for milk, fat, and protein yields, respectively. For the combined lactation heritability values were 0.29, 0.28, and 0.26 for milk, fat, and protein yields. The estimated parameters will be used in national genetic evaluations for production traits.
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참고문헌 (12)
참고문헌 신청
/ 1999 / SAS User's Guide : Statistics, Ver 9.1 Edition / SAS Inst., Inc.
Amasaib, E. O / 2008 / Effect of Season of Calving and Parity on Some Productive Traits in Pure and Crossbred Cattle in Sudan / Research Journal of Dairy Sciences 2 (1) : 5 ~
Asgari, G. H / 2011 / Genetic parameters of milk and fat yield in normal and high yielding dairy cows / 2nd International Conference on Biotechnology and Food Science IPCBEE 7
Bulmer, M. G. / 1971 / The effect of selection on genetic variability / Am. Nat 105 : 201 ~ 211
Carabano, M. J. / 1989 / Estimation of Genetic Parameters for Milk and Fat Yields of Dairy Cattle in Spain and the United States : 131 ~
Amasaib, E. O / 2008 / Effect of Season of Calving and Parity on Some Productive Traits in Pure and Crossbred Cattle in Sudan / Research Journal of Dairy Sciences 2 (1) : 5 ~
Asgari, G. H / 2011 / Genetic parameters of milk and fat yield in normal and high yielding dairy cows / 2nd International Conference on Biotechnology and Food Science IPCBEE 7
Bulmer, M. G. / 1971 / The effect of selection on genetic variability / Am. Nat 105 : 201 ~ 211
Carabano, M. J. / 1989 / Estimation of Genetic Parameters for Milk and Fat Yields of Dairy Cattle in Spain and the United States : 131 ~
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