Three Holstein-Zebu crossbred males ruminally cannulated were used for studying the in situ degradability of silage of three sorghum varieties. Incubation times were 6, 12, 24, 48, 72 and 96h. Dry matter disappearance at 96h incubation were 70.8, 66.1 and 67.9% for BR303, BR601 and BR700 varieties, respectively. Disappearances at 96h incubation were 73.4, 63.9 and 59.0% for CP, 57.6, 53.8 and 52.7% for NDF; 57.7, 53.0 and 53.0% for ADF; 64.0, 58.8 and 58.2% for cellulose; and 57.4, 54.7, 52.3% for hemicellulose, respectivelly for BR303, BR601 and BR700 varieties. These results have shown a positive influence of higher grain proportion in the silage on fiber and protein degradability.
Silage; sorghum; rumen; in situ digestibility
