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The Impact of Milk Production Level on Profit Traits of Holstein Dairy Cattle in Korea

국내 Holstein종 젖소의 생산수준이 젖소의 수익형질에 미치는 효과

  • 도창희 (충남대학교 농업생명과학대학 동물바이오시스템과학과) ;
  • 박수훈 (충남대학교 농업생명과학대학 동물바이오시스템과학과) ;
  • 조광현 (농촌진흥청 국립축산과학원) ;
  • 최연호 (농촌진흥청 국립축산과학원) ;
  • 최태정 (농촌진흥청 국립축산과학원) ;
  • 박병호 (농촌진흥청 국립축산과학원) ;
  • 윤호백 (농촌진흥청 국립축산과학원) ;
  • 이동희 (서울과학기술대학교)
  • Received : 2013.01.31
  • Accepted : 2013.09.12
  • Published : 2013.10.31

Abstract

Data including 1,372,050 milk records pertaining to 438,019 cows from 1983 to 2011 collected during performance tests conducted by the National Livestock Cooperative Dairy Improvement Center were used to calculate milk income and profit of individuals and investigate the effects of production levels of early lactation (parity 1 and 2, respectively). Individuals with a moderate level of early lactation stayed longer in herds. Among parity 1, the 9,000 kg or higher group had a lower mean number of lactations than the overall mean of 3.13. The 7,000 kg or lower and 10,000 kg or higher groups had lower mean life time milking days than the overall mean of 1,076.8 days. Standard deviations of lifetime traits tended to decrease as production levels increased. For parity 2, the 11,000 kg or higher group had a lower mean number of lactation than the overall mean of 3.43. The lifetime milking days was highest in the 12,000 kg group (1,212.0 days), and generally smaller in the lower groups. Profit increased as the production level of groups increased for both parity 1 and 2. In groups with low production levels, profit of parity 1 was higher than that of parity 2, while the reverse was true in groups with high production levels. These results suggest that individuals in the low production groups had a greater likelihood to be culled due to reproductive or other problems. Furthermore, the accuracy of the prediction of lifetime profit of individuals with a milk yield of 305 days seems to be higher for parity 2 than parity 1; therefore, it is desirable to predict lifetime profit using the 305d milk yield of parity 2. In conclusion, breeding goals are based on many factors in functions for the estimation of profit; however, production levels during early lactation (parity 1 and 2) can be used as indicators of profit to extend profitability.

Keywords

305d milk yield;Lifetime traits;Net profit;Milk income

Acknowledgement

Grant : 생애수익지수 모델별 비교 및 개발

Supported by : 농촌진흥청

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