EFFECTS OF CANOLA MEAL ON TISSUE TRACE MINERAL CONCENTRATIONS IN GROWING PIGS

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Abstract
This experiment was conducted to determine if the availability of supplemental trace minerals would be reduced by canola meal (CM) in a cereal grain-based diet for growing pigs. Thirty-two barrows weighing 21.5–23.5 kg were allotted to four dietary treatments: barley-wheat, 2:1, supplemented with (1) soybean meal (SBM); (2) canola meal (CM)-source 1 (CM1); (3) canola meal-source 2 (CM2), all fed according to a controlled feeding schedule; or (4) the CM1 diet fed ad libitum. All diets were supplemented with minerals at levels recommended for 20- to 35-kg pigs. In pigs slaughtered at 57 kg, liver and pancreas zinc (Zn) concentrations (dry basis) were higher (P < 0.05) when the SBM diet was fed compared to the CM diets. Pigs fed CM1 diet by either feeding regime showed lower Zn concentrations than those fed CM2. Treatment effects on tissue concentrations of other minerals were minor. From 23 to 57 kg liveweight, pigs fed CM diets gained less (P < 0.05) than those fed a SBM diet under controlled feeding (0.78 vs. 0.86 kg d−1). Pigs fed CM1 diet ad libitum gained 0.87 kg d−1. These results could not be directly related to a mineral deficiency. Based on tissue Zn concentrations, it was concluded that the dietary Zn was less available from the CM diets compared to the SBM diet. Key words: Trace minerals, zinc, pigs, canola meal