| Summary: | The "In Sacco" technique and the Mobile Nylon Bag Technique were used to compare canola meal (CM) and soybean meal (SBM) with respect to rumen escape and lower digestive tract digestibility of dry matter, protein, energy, and essential amino acids (EAA). A sample of CM was obtained from five different processors and designated A, B, C, D, and E. A SBM sample was obtained from a processor in Altona, Manitoba, and designated F. Two rumen cannulated Holstein steers and three duodenally cannulated Holstein steers were used. Small nylon bags, 3 cm x 5 cm, containing .5 g of sample, were incubated in the rumen for various time intervals, then removed. Half of the bags removed were analyzed for rumen effects, the other half were then incubated in pepsin-HC1 solution for 3 hrs at 39o C, to simulate abomasal digestion. The bags were then passed through the lower digestive tract of the duodenally cannulated steers, subsequently collected in the feces, and analyzed. Six trials were carried out with the rumen incubation periods as follows: 0 h; 4 h; 8 h; 12 h; 16 h; 30 h. The data obtained showed that the N escape values of SBM in the rumen fall within the range of values obtained for CM. The data obtained showed that the DM escape of SBM is less than CM at 30 h, but at the other time intervals it falls within the range of values obtained for CM. The data obtained showed that energy escape from the rumen for SBM is higher than that of CM at 4 and 16 h, but at 8, 12, and 30 h, it is similar to the values obtained from some of the CM samples. The data obtained showed that EAA escape of SBM falls in the range of values obtained for CM at all time intervals, except for: His at 4 h; Met at 12 h; Met at 16 h. The digestibility data obtained showed that N, DM, and energy digestibility from SBM is greater than from CM. These data suggest that all EAA had digestibilities that were greater from SBM than from CM in the lower digestive tract, except: Met at 0 h; Met at 4 h; Lys His Val Thr Ile Leu and Met at 8 h; Lys His Phe and Met at 12 h; all EAA at 16 h. In general these data suggest that CM and SBM samples were not different with respect to rumen escape of dry matter, protein, energy and essential amino acids. However, these data suggest that lower digestive tract nutrient digestibility from SBM is greater than CM.
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