摘要
The objectives of the study were to investigate the effects of different levels of urea treatments on chemical composition, nutritional value and rumen degradability of sorghum stover. Two groups of animals were used in this experiment. The first group, which served as control, was offered untreated sorghum stover. The other, the experiment group recived sorghum stover to which was added 2%, or 4% urea. Crude protein （CP） content of the treated sorghum was enhanced （P 〈 0.05） over the untreated one, and ranked as 7.30% and 6.05% CP for 4% and 2% respectively. Nutrient detergent fiber （NDF） content was decreased （P 〈 0.05） from 92.5% （control） to 89.8% and 87.8% for 2% and 4% urea respectively.Ether extract （EE） content was decreased （P 〈 0.05） from 1.77% （control） to 1.63% and 0.82% for 2% and 4% respectively. The rumen degradability was increased （P 〈 0.05） from 59.2% （control） to 64.2%, and 67.2% for 2%, and 4% sorghum and in hours 0, 4, 8, 16, 24, 48, 72 and 96.
