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Abstract
The influence of ruminal metabolic processes on nutritive value of dietary nitrogen was studied. The effect of replacing protein partially by urea was also analyzed. True digestibility coefficient of duodenal contents protein of sheep fed lucerne is always significatively higher than lucerne protein. Biological value shows similar but larger changes. Ruminal metabolic processes act beneficiously on nutritive quality of food nitrogen compounds; protein modified in this way is more easily absorbed and better utilized. When a fraction of proteic nitrogen is replaced by ureic nitrogen the same is true.
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