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Effect of Number of Lactation Records on the Selection Rates in Holstein Dairy Cattle
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  • Effect of Number of Lactation Records on the Selection Rates in Holstein Dairy Cattle
  • Effect of Number of Lactation Records on the Selection Rates in Holstein Dairy Cattle
저자명
Cho. Kwang-Hyun,Choy. Yun-Ho,Kong. Hong-Sik,Lee. Hak-Kyo,Kim. Sung-Hoon,Park. Kyung-Do
간행물명
한국동물자원과학회지
권/호정보
2013년|55권 2호|pp.81-85 (5 pages)
발행정보
한국동물자원과학회
파일정보
정기간행물|ENG|
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이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
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기타언어초록

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.