Milk composition as affected by time grazing combined with restricted indoor feeding
Milk composition as affected by time grazing combined with restricted indoor feeding
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牛奶成分受放牧时间和限制室内饲养的影响
DOI：
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发表时间：
2008
影响因子：
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通讯作者：
T. Kristensen
中科院分区：
文献类型：
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作者：
F. Oudshoorn;T. Larsen;J. Nielsen;T. Kristensen
研究了放牧时间（4 h和9 h）结合室内限饲对肉鸭脂肪含量、脂肪酸组成、？生育酚、s-胡萝卜素、尿酸和s-羟基丁酸。在实验的第2、4和6周结束时，收集上午和下午的牛奶样品三次。放牧4 h的奶牛上午和下午的牛奶中中长链脂肪酸（C6-C14）、C18：1 n-9、C18：2 n-6、C18：3 n-6和顺式9、反式11共轭亚油酸浓度在所有3周内变化显著。脂肪百分比，？-生育酚、S-胡萝卜素、牛奶尿酸和S-羟基丁酸在来自4小时牧场的上午和下午牛奶之间表现出显著差异。相反，在9小时牧场组中研究的大多数参数在上午和下午的牛奶之间没有观察到显著差异。同样，对于大多数参数，4小时和9小时的晨奶之间的差异也不显著。因此，在一般情况下，上午4小时，上午9小时和下午9小时牛奶是非常相似的，在其组成的参数研究。
The aim was to study the effect of pasturing time (4 versus 9 hours) combined with restricted indoor feeding on fat content, fatty acid composition, concentration of ?-tocopherol, s-carotene, uric acid and s-hydroxybutyrate in milk from Holstein Friesian dairy cows. Morning and afternoon milk samples were collected three times at the end of week 2, 4 and 6 of the experiment. Morning and afternoon milk from cows at pasture for 4 h varied significantly in medium and long chain fatty acids (C6-C14), C18:1 n-9, C18:2 n-6, C18:3 n-6 and cis 9, trans 11 CLA concentration for all the 3 weeks. Fat percentage, ?-tocopherol, s-carotene, milk uric acid and s-hydroxybutyrate showed significant differences between morning and afternoon milk from 4-h pasture. In the contrary, there was no significant difference observed between morning and afternoon milk for most parameters studied in the 9-h pasture group. Similarly the difference between morning milk from 4- and 9-h was also non-significant for most parameters. Therefore, in general 4-h morning, 9-h morning and 9-h afternoon milk were very similar in their compositions for the parameters studied.