SOME EFFECTS OF PROCESSING AND SEED SOURCE ON THE NUTRITIONAL QUALITY OF RAPESEED MEAL

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Abstract
Rapeseed meals (RSM), B. campestris L. (cv. Span), derived from a pooled seed source processed in three different Canadian pre-press solvent-extraction processing plants were compared with RSM derived from B. campestris Canadian seed and a B. napus RSM derived from European seed, the latter two meals being processed in The Netherlands. Amino acid, glucosinolate and proximate analyses were conducted. Feeding experiments with mice revealed no differences in weight gains, feed intakes, digestibility of energy or protein, efficiency of feed utilization or protein quality among the three samples of Canadian-processed Span RSM, and the responses equalled those obtained with soybean meal. RSM processed in The Netherlands and derived from Canadian seed equalled the Canadian-processed Span RSM except for a significantly (P = 0.05) lower digestibility of protein. The Netherlands-processed B. napus RSM proved to be inferior and resulted in slower growth and lower protein digestibility. Swine fed the same five RSM samples in typical swine rations but at lower levels of RSM (7.5 and 15.0%) than those (9.1 and 10.1; 19.9 and 22.5; and 30.9 and 34.9%) in the mouse tests showed a reduction in daily gain (P = 0.05) for 15% RSM compared to 7.5% and a tendency for the B. napus RSM from The Netherlands to be inferior (P > 0.05). It is suggested that differences in myrosinase inactivation during processing, the higher oxazolidinethione content characteristic of B. napus RSM, and possible overheating during the toasting phase of RSM production were responsible for the differences observed.

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