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Utilization of Rapeseed Meal in Dog Rations

University of Guelph, Guelph, Ontario

Abstract

Span A rapeseed meal was included in extruded dog foods at various levels to provide up to 25% to 30% of the protein in the product. Both Beagles and Alaskan Malamutes ate all such rations readily and grew normally. There were no abnormal changes in hematological or thyroid parameters of animals which were exposed to the experimental diets in either short or long-term experiments. The nitrogen digestibility of the rapeseed meal diets was from 75% to 85% in young dogs which was typical of that reported for canines fed commercial-type diets. Diets which contained 20% rapeseed meal were also fed in a kennel trial which lasted 1 year. This ration, in which rapeseed meal contributed 25% to 30% of the protein, was readily consumed and no problems with reproduction or long-term acceptance were encountered. The extrusion process used to produce the dog foods used in this study probably inactivated those toxic factors that may have been present thus allowing the addition of higher levels of rapeseed meal than those which are typical for most livestock feeds without deleterious effects.

¹ Present Address: Moose Jaw Union Hospital, Moose Jaw, Saskatchewan.

² The authors wish to acknowledge support of the Rapeseed Association of Canada for this research and thank Maple Leaf Mills Limited of Toronto, Ontario for extruding the diets used in the short-term trial. The authors are grateful to Mr. Keith Shaver of Martin's Mills Limited of Elmira, Ontario for his practical advise in preparing commercial quantities of dog foods and we wish to thank Martin's Mills Limited for donating the feeds used in the long-term experiments and our kennel trials. We thank Mr. Fred Black of Shaydel Research Facility for the use of his kennelsand dogs and Dr. Marion Smart of the Ontario Veterinary College for her veterinary services.