지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2013.1
- 수록면
- 81 - 85 (5page)
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초록· 키워드
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This experiment was conducted to investigate the effects of lactation records in Holstein dairy cattle on the selection rates using a total of 341,436 test records from 113, 812 heads of cattle from first to third lactation. Heritabilities for milk, fat, and protein yields were highest at first lactation(0.28, 0.24, and 0.27, respectively), and decreased to 0.14, 0.15, and 0.13 at third lactation. For the milk yields, phenotypic correlations between first and second lactation, first and third lactation, and second and third lactation were low(0.49, 0.39, and 0.47, respectively), while genetic correlations among consecutive lactations and between second and third were above 0.8 and 0.9. In Model I, of the 1,138 heads the top 1% were selected based on first lactation records, only 32.4%(396 heads) were re-selected when the second lactation records were included and the 67.6%(769 heads) were newly selected animals. While in Model II, 85.1%(1,138 heads) of the animals which were selected as the top 1% on the basis of first and second lactation records were included. A multiple trait evaluation method using multiple lactation records is more desirable than a single trait evaluation method using first lactation records only.
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참고문헌 (12)
참고문헌 신청
Cassell, B. G / 1983 / Use of later records in dairy sire evaluation: a review / J. Dairy Sci 66 : 1 ~ 10
Genetic Evaluation Reports of Dairy Cattle in Korea. / 2011 / National Institute of Animal Science(NIAS)
Groeneveld, E. / 1990 / PEST User’s Manual. Institute of Animal Husbandry and Animal Behaviour
Groeneveld, E. / 2008 / VCE User’s Guide and Reference Manual Version 6.0. Institute of Farm Animal Genetics
Hammami, H. / 2008 / Genetic Parameters for Tunisian Holsteins Using a Test-Day Random Regression Model / J. Dairy Sci 91 : 2118 ~ 2126
Genetic Evaluation Reports of Dairy Cattle in Korea. / 2011 / National Institute of Animal Science(NIAS)
Groeneveld, E. / 1990 / PEST User’s Manual. Institute of Animal Husbandry and Animal Behaviour
Groeneveld, E. / 2008 / VCE User’s Guide and Reference Manual Version 6.0. Institute of Farm Animal Genetics
Hammami, H. / 2008 / Genetic Parameters for Tunisian Holsteins Using a Test-Day Random Regression Model / J. Dairy Sci 91 : 2118 ~ 2126
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