NUTRITIONAL VALUE OF UNEXTRACTED AND EXTRACTED DEHULLED CANOLA RAPESEED FOR BROILER CHICKENS

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Abstract
Two experiments were conducted with broiler chickens from 1 day old to 4 wk of age to determine the nutritional value of unextracted and extracted dehulled canola rapeseed (DCS). In exp. 1, raw or autoclaved DCS at levels of 10 and 20% of the diet were compared with extracted DCS at levels of 5 and 10%. The inclusion of extracted DCS in the diet had no adverse effects on the performance of chicks. Dietary levels of 10 and 20% raw DCS resulted in a decrease in feed intake (P > 0.05) and weight gain (P < 0.05) and an increase in feed/gain ratio (P < 0.05). The performance of birds fed autocalved DCS was intermediate between that of birds fed raw or extracted DCS. Experiment 2 involved a comparison of extracted DCS at levels of 0, 10, 20 and 30% of the diet with variable or constant levels of dietary lysine and sulphur amino acids. Dietary levels of 20 and 30% extracted DCS resulted in a progressive decrease (P < 0.001) in feed intake and weight gain, and an increase (P < 0.001) in feed/gain ratio. Lysine supplementation improved the nutritional value of extracted DCS. It was concluded that canola rapeseed should be heated before feeding to broiler chickens. Autoclaved or extracted DCS may be included in the diet of broiler chickens at levels of 10% with no reduction in growth rate.