EFFECTS OF RELATIVE CONTRIBUTIONS OF CEREAL AND CANOLA RAPESEED MEAL TO THE DIETARY PROTEIN ON THE PERFORMANCE OF GROWING-FINISHING PIGS

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Abstract
Bonanza barley, containing 11.0% protein, and Glenlea wheat (13.4% protein) were separately supplemented with two levels (10.7 and 18.8%) of low-erucic acid, low-glucosinolate rapeseed (canola) meal (36.3% protein) to provide barley diets and wheat diets containing 13.7 or 16.3% and 15.8 or 17.5 total protein, respectively. One of four pigs, in each of six pens, were allotted to each of the four diets, provided as pellets in individual self-feeders. Access to the assigned diet was restricted to two 45-min periods daily over the period from 26 to 96 kg average liveweight. Pigs fed the 18.8% canola diets had better performance up to 56 kg liveweight but subsequent performance was similar in all groups. Although dietary treatment did not significantly affect carcass data, there was a trend for pigs fed the barley-18.8% canola diet to be superior in measurements of carcass quality. Apparent digestibility of energy and nitrogen was higher for the wheat diets. Assessment of relative palatabilities favored the diets containing 10.7% canola meal.