| Study of nutritional status and management of lactating dairy COWS using analysed milk composition |
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Sung-mo Lee1, Dong-won Kim2, Byung-ryul Choi2, Kang-moon Seo3, Chong-hae Hong3 |
1Incheon Metropolitan City Institute of Health & Environment
2CJ Feed Center
3Dept. of Veterinary Medicine, Kangwon National University |
| 유 성분 분석을 통한 젖소 영양상태 및 개체관리에 관한 연구 |
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이성모1, 김동원2, 최병렬2, 서강문3, 홍종해3 |
1인천광역시보건환경연구원
2제일제당사료기술연구소
3강원대학교수의학과 |
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| Abstract |
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Milk constituents and somatic cell count (SCC) were analysed for 4,059 milk samples from 178 dairy farms from April to December in 1999. Correlations among each milk constituents, milk urea (MU) concentration and SCC in association with lactation stage, milk yield and parity, and balancing status of nutrients' supplies were analysed, and the results are summarized as follows; Averages of milk fat percent, total solids percent and milk yield were $3.72{pm}0.91%$, $12.50{pm}1.31%$ and $23.80{pm}8.54kg$, respectively, whereas those were significantly lower during the summer season. In contrast, average of MU concentration was $0.0361{pm}0.0006%$ which was significantly higher during the summer season. With milk yield, concentrations of fat, protein and SCC in milk decreased but concentrations of lactose and urea in milk and body condition score (BCS) were not altered. Concentrations of fat, protein, lactose, total solids, SNF, and urea in milk were significantly affected by stage of lactation ($P{leq}0.0001$) but SCC was not changed. Parity of dairy cows had a significant effect on concentrations of fat ($P{leq}0.02$), lactose ($P{leq}0.0001$), total solids ($P{leq}0.002$), and SNF ($P{leq}0.0001$) in milk and milk yield ($P{leq}0.0005$) but did not change concentrations of urea and protein in milk. Somatic cell count had significant positive correlationship with percentages of fat, protein and total solids ($P{leq}0.0001$), respectively, but had negative correlationship with percentages of urea and lactose in milk and milk yield ($P{leq}0.0001$). Milk urea concentration was negatively correlated with concentrations of protein, fat, total solids, and SNF in milk and milk yield ($P{leq}0.0001$) and, according to regression analysis using milk urea concentration and SCC, following equation was obtained; $Y(MU)=3.688{ imes}10^{-2}-4.04{ imes}10^{-7}{ imes}X(SCC{ imes}1,000)(r^2=0.0038$, $P{leq}0.0001$). We studied balance between protein and energy supplies to dairy cows in each farm based upon milk urea and protein concentrations, and results showed that 137 of total 178 farms fed cows unbalanced amounts of dietary protein and energy. |
| Key Words:
milk urea, SCC, milk composition, reproduction, dairy cow |
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