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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
- 2016.1
- 수록면
- 1 - 14 (14page)
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초록· 키워드
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In this research data representing 72,946 primiparous cows from 724 herds with 638,063 total test day records calved between 2001 and 2011. These data were analysed to determine the effect of age at first and season of calving on parameters of the Wood lactation curve. Also, genetic trend of the lactation curve parameters in different calving years were evaluated. The results indicate that the highest rate of atypical lactation curve was related to cows that calved in summer (28.05 %). The maximum phenotypic relationship between initial milk yield and total 305-d milk yield was observed in cows calved in spring (0.40). The role of peak yield is more than peak time on 305-d total milk yield in primiparous Holstein. One month increase in age at first calving from 18 to 26 month raised 305-d milk yield by around 138 kg and from 27 to 32 month decreased by 61 kg. The persistency of lactation between 101 and 200 days is higher than that of 201–305 days. Our results indicate that the shape of lactation curve is largely dependent on the season of calving (higher level of milk production in cows which calved in autumn and winter). The heritabilities of parameters of lactation curve and persistency measures were low. The genetic trends for peak time, peak yield and 305-d milk yields were positive and estimated to be 0.019, 0.021 and 8.13 kg/year respectively.
So the range from 24 to 26.5 month of calving is the optimum calving time in primiparous Holstein for maximizing 305-d milk yield.
목차
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참고문헌 (61)
참고문헌 신청
Ptak E / 1993 / Use of test day yields for genetic evaluation of dairy sires and cows / Lives Prod Sci 34:23~34
Wilmink JBM / 1987 / Adjustment of test-day milk, fat and protein yield for age, season and stage of lactation / Lives Prod Sci 16:335~348
Schutz MM / 1990 / Variation of milk, fat, protein, and somatic cells for dairy cattle / J Dairy Sci 73:484~493
Bachman K / 1988 / Effect of pregnancy, milk yield, and somatic cell count on bovine milk fat hydrolysis / J Dairy Sci 71:925~931
Pirlo G / 2000 / Effect of age at first calving on production traits and on difference between milk yield returns and rearing costs in Italian Holsteins / J Dairy Sci 83:603~608
Wilmink JBM / 1987 / Adjustment of test-day milk, fat and protein yield for age, season and stage of lactation / Lives Prod Sci 16:335~348
Schutz MM / 1990 / Variation of milk, fat, protein, and somatic cells for dairy cattle / J Dairy Sci 73:484~493
Bachman K / 1988 / Effect of pregnancy, milk yield, and somatic cell count on bovine milk fat hydrolysis / J Dairy Sci 71:925~931
Pirlo G / 2000 / Effect of age at first calving on production traits and on difference between milk yield returns and rearing costs in Italian Holsteins / J Dairy Sci 83:603~608
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