The experiment was carried out to study effects of supplementary dietary protein of differing solubilities, and of brewers' grains on feed intake, digestibility and N balance in local “Yellow” cattle fed ensiled cassava root, urea and rice straw as basal diet. Four local (“Yellow”) male cattle were assigned to 4 treatments in a 4*4 Latin square arrangement: BG-CSF: brewers’ grains with cassava foliage, BG-WS: brewers’ grains with water spinach, NBG-CSF: no brewers’ grains with cassava foliage, NBG-WS: no brewers’ grains with water spinach. Experimental periods were of 15 days: 9 days for adaptation, 5 days for collection of feces and urine and the last day to take rumen fluid by stomach tube. Adding 5% of brewers’ grains to the diet increased the DM intake, the apparent DM digestibility and N retention. Similar but smaller benefits were found when water spinach replaced cassava foliage as the main source of (true) protein
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