Abstract 419

Parra,-A; Combellas,-J; Dixon,-R

Inst. Produccion Animal, Facultad de Agronomia, Univ. Central de Venezuela, Maracay, Venezuela.

Tropical-Animal-Production. 1984, 9: 3, 196-199; 9 ref.

Concentrates of animal or vegetable origin and fresh or stove-dried grasses, silage or brewer's grains, were incubated for 8 or 24 h in nylon bags in the rumen of cattle fed on Pennisetum purpureum. Among energy sources the wheat, maize and rice, but not the sorghum, products had high degradability of nitrogen. Among vegetable protein sources the sesame byproducts, soya flour and Psophocarpus grain had the highest N degradability; the others studied were cottonseed cake and Canavalia grain. Degradability of N was lower for fish meal than for meat or poultry meals. That of the roughages decreased with stove drying and, for the 2 grasses, decreased with age of the plant.