Low glucosinolate (Candle) rapeseed meal (RSM) was evaluated at up to 225 g/kg in diets of Small White turkeys from 1 to 98 days of age. Three nutrient density treatments assessed the effect on performance and production efficiency of supplementary dietary energy in diets incorporating RSM. Live weight gains to 63 days were similar when the diet included up to 150 g/kg of RSM but slightly reduced at the highest RSM level. Live weight gains from 63 to 98 days were reduced by each increase in RSM. Dietary nutrient density did not affect final live weights but influenced feed intake and efficiency of feed conversion. Mortality was not increased by RSM. A decrease in carcass finish at the highest RSM level was related to the difference in live weight. True metabolizable energy (TME) values determined on the feedstuffs used accounted more satisfactorily for observed performance than average published metabolizable energy (ME) values. Determination of TME values by bioassay of experimental feedstuffs is advocated to increase the reliability of data on energy relationships.
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SALMON et al. (1979) studied this question.
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