Abstract
Two rapeseed meal samples (Sample A, hybrid 5900 and sample B, double low rapeseed No.4) obtained from China and one Canola meal sample obtained from a local crushing plant in Canada were used to investigate the amino acid degradability of rapeseed/Canola meal in rumen and amino acid digestibility of ruminal incubation residues by precision-fed rooster bioassay. Results show that in ruminal incubation the degradation rate of non amino acid nitrogen in crude protein is higher than that for amino acid nitrogen in crude protein, the results also suggest that the degradation rate of amino acid nitrogen in Chinese rapeseed meal sample B was lower than that for Canadian Canola, but that in Chinese rapeseed meal sample A is much close to that for Canadian canola meal. For all amino acids the digestibility of the bypass or residual protein as measured by the precision-fed rooster bioassay tended to be lower for Chinese rapeseed meal sample A than for sample B or Canadian canola meal which had similar digestibility values. However following a calculation of total amino acid availability, involving the digestibility of amino acids in the rumen and rooster bioassay the results are less contradictory. Results indicated that in traditional roasting-expelling process, heat treatment, especially dry heat treatmeat could decrease amino acids degradability in rumen of rapeseed/canola meal, but also may decrease total availability of amino acids of rapeseed/canola meal.
Highlights
Heat treatment has been used as a procedure to increase the bypass protein of feedstuffs for ruminants
China and one canola meal sample obtained from a local crushing plant in Canada were used in the study
Corresponding values for amino acid percent for the Canadian canola meal the amino acids were enriched degraded in the crude protein were 79.9, 72.2 and 86.7%, in the residual samples
Summary
Heat treatment has been used as a procedure to increase the bypass protein of feedstuffs for ruminants. (1997) and Moshtaghi and Ingalls (1995) showed that the heat treatment of soybean meal and canola meal could decrease the degradability of the feed protein in the rumen and could increase the availability of amino acids in the bypass protein. Reports have demonstrated that the heat-damaged whole soybeans resulted in a decrease in the intestinal digestibility of essential and nonessential amino acids (Stern et al, 1985; Faldet and Satter, 1991). In this regard the degree of heat treatment may affect overall digestibility of feed amino acids. The objective of the current study was to evaluate the digestibility of amino acids in the rumen and post ruminally for two types of Chinese rapeseed meal and to compare the results with that for Canadian canola meal
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