Dietary Cellulose Content and Urea Utilization
نویسنده
چکیده
Purified diets were offered to sheep ad libitum in two experiments. Urea was the main source of nitrogen, while energy was supplied as cellulose (20 to 72% ), starch (0 to 32% ) , or sucrose (0 to 35%) . The data indicated that (a) cellulose could serve as a suitable sole source of energy for rumen microbial synthesis, and (b) diets composed largely of cellulose, urea, and minerals could maintain animals in positive nitrogen balance. As the proportion of cellulose in the diet increased, both the intake and digestibility of dry matter declined. Despite this fall in food intake, both cellulose intake and digestibility increased. Nitrogen balances also decreased as food intake declined, but were always positive, usually exceeding 1 g N/day. The data are discussed in relation to the value of cellulose as a source of energy for the utilization of non-protein-nitrogen by rumen micro-organisms.
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