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首页> 外文期刊>Medycyna Weterynaryjna >Changes in the content of fat and protein in milk from the high yielding cows.
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Changes in the content of fat and protein in milk from the high yielding cows.

机译：高产奶牛牛奶中脂肪和蛋白质含量的变化。

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摘要

Data on milk yield within the last 20 years, from a total of 3357 Black and White cows, with lactations no shorter than 260 days of milking, and from one of the high yielding dairy herds in Southwest Poland were analysed [date not given]. The percentage of milk protein content and protein yield were significantly higher in purebred Black and White cows. The protein content in crossbred cows from the final stages of displaced crossbreeding (87.6-100% HF) was lower by 0.16%. Similarly, milk protein yield was significantly lower (p=0.01) in crossbred cows compared to purebred Black and White cows. The calculated coefficient of the correlation between fat and protein content in milk was r=0.546 (p=0.01). However, this value does not authorize the use of selection for only one feature (fat percentage), since it would not lead fully to the increase in the second feature. For this reason, the authors express the opinion that obtaining the optimal difference in fat to protein content in milk (RTB=1:1) on a level of 3.5% is possible. However, it will require a multi-generational improvement of animals towards this goal..
机译：分析了过去20年中总共3357头黑白奶牛，泌乳不少于260天的泌乳期以及波兰西南部一个高产奶牛场的产奶量数据（未提供日期）。黑白奶牛的乳蛋白含量和蛋白产量百分比显着更高。置换杂交的最后阶段（87.6-100％HF）的杂交母牛的蛋白质含量降低了0.16％。同样，与纯种黑白奶牛相比，杂种奶牛的牛奶蛋白产量也显着降低（p = 0.01）。计算出的牛奶中脂肪和蛋白质含量之间的相关系数为r = 0.546（p = 0.01）。但是，此值不授权仅对一个功能（脂肪百分比）使用选择，因为它不会完全导致第二个功能的增加。因此，作者表达了这样的观点，即可以使牛奶中的脂肪与蛋白质含量之间的最佳差异（RTB = 1：1）达到3.5％。但是，为了实现这一目标，将需要对动物进行多代改良。

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