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Protein Quality Evaluation of Low Glucosinolate-Low Erucic Acid Rapeseed Meal and Unprocessed Faba Beans in Young Pigs¹

Department of Animal Science, The University of Alberta, Edmonton, Alberta, T6G 2E3

Protein quality of rapeseed meal (RSM) from low gluco-sinolate-low erucic acid, Brassica napus, unlicensed cultivar #1788 and ground faba beans (FB) from Vicia faba L. Var. Minor was evaluated for growing pigs. Eight diets differing in lysine content were fed for 6 weeks. The basal diet consisted mainly of wheat flour adequately fortified in all known nutrients except lysine (0.22%). The basal diet was supplemented with crystalline lysine (0.18%, 0.36% and 0.50%), RSM (7% and 14%) and FB (10% and 20%). The lower and higher levels of RSM or FB provided approximately 0.15% and 0.30% supplemental lysine. Weight gain data ranked the supplements in the following order: 0.50% lysine, 0.36% lysine, 14% RSM, 20% FB, 0.18% lysine, 10% FB, 7% RSM. Feed conversion efficiency for the 20% FB supplement was significantly less than for the first three supplements. Differences in plasma lysine, serum thyroxine and protein bound iodine levels paralleled dietary lysine. The results suggest that protein quality of low glucosinolate-low erucic acid RSM is equal to or better than that of FB and that these protein supplements may be fed to young pigs at 14% and 20% levels, respectively, without adverse effects.

KEY WORDS: • low glucosinolate-low erucic acid • rapeseed meal (RSM) • faba bean (FB) • lysine digestibility • plasma amino acids

¹ Supported in part by a grant from the National Research Council of Canada.

² Postdoctorate Research Fellow.

Manuscript received 23 July 1975.