论文部分内容阅读
据文献报道,当母牛从舍饲转为放牧饲养时,一些学者(E·Ueyama、1964,阿.克.什瓦别,1949,等)认为此时牛乳中的脂肪、蛋白质、乳糖和脱脂干物质含量增加;另一些学者(克.符.马尔科娃,1953;尔.勃.达维多夫,1958)却发现这些成分的水平下降。显然两种见解与母牛在舍饲期和过度期的饲养水平有关。牧草中碳水化合物与氮的比例及氮的来源亦具有同样意义。本文根据季米里亚捷夫农学院有关教研
According to the literature, some scholars (E · Ueyama, 1964, 阿克克什瓦be, 1949, etc.) considered that the fat, protein, lactose and degreasing in milk at this time when the cow was switched from feeding to grazing. The dry matter content increased; others (g. Markovova, 1953; Werbildavidov, 1958) found a decrease in the levels of these components. Clearly, both opinions are related to the level of feeding of cows in the feeding and overdue periods. The proportion of forage carbohydrate to nitrogen and the source of nitrogen also have the same meaning. This article is based on the research and research conducted by the Jiryajijf College of Agriculture