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Publisher SummaryThe value of urea for the physiological processes resulting in the formation of milk is an open question. There are some contradictions in the views of many authors on the value of urea for milk production. The most recent investigation shows that non-protein nitrogen (NPN), derived from synthetic compounds, is utilized to form milk protein; however, its effectiveness in this field of production seems to be lower than in the case of the beef cattle. This chapter describes nitrogen metabolism in the rumen of dairy cattle and urea utilization. The necessity of supplying large amounts of protein and carbohydrates with the food is especially essential in dairy cattle feeding. The amounts required of these components are considerably higher than those for growing calves or beef cattle. It is an essential factor influencing the extent to which the foodstuffs are transformed in the rumen. The amount of food protein that can be digested and assimilated by the rumen microorganisms is limited. When the diet contains a low concentration of protein, the rumen microorganisms are able to convert a high percentage of foodstuff protein.

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95/12/18 - با استفاده از افزونه دانلود فایرفاکس و کروم٬ چکیده مقالات به صورت خودکار تشخیص داده شده و دکمه دانلود فری‌پیپر در صفحه چکیده نمایش داده می شود.