Degradability and intestinal digestibility of crude protein and amino acids of extracted rapeseed meal

Samples of extracted rapeseed meal (RN were incubated using the "nylon bag" method in two steers fitted with rumen cannulas in intervals of 0, 2, 4, 8, 16, 24, and 48 hours. The effective degradability of crude protein (CP) and amino acids (AA) in the feed was calculated at the outflow rate of 0.05 per hour. Correction of microbial contamination was not performed. Effective degradability (DEG) of CP in RM was determined to amount to 68.1% and that of AA in the following sequence: Cys, Met, Asp, Thr, Ser, Glu, Pro, Gly, A la, Val, Ile, Leu, Tyr, Phe, His, Lys a Arg was 73.89/o, 67.2%, 69.5%, 65.9%, 65.4%, 77.0%, 70.1%, 72.4%, 69.8%, 71.1%, 69.8%, 70.8%, 68.8%, 66.4%, 69.8%, 71.1% and 72.6%, respectively. Intestinal digestibility (DSI) of CP in the diet was determined by the "mobile bag" method. The calculated value of DSI was 65.9%. The results were compared with accessible literature sources. We can state that during the comparison of DEG values in RM with literature data good coincidences were attained. Determined DSI values were lower than those detected by most authors. Henceforth, it is necessary to standardise the above-mentioned DEG and DSI assessment methods.