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Comparison of low glucosinolate low erucic acid rapeseed meal cultivar tower commercial rapeseed meal and soybean meal as sources of protein for starting growing and finishing pigs and young rats



Comparison of low glucosinolate low erucic acid rapeseed meal cultivar tower commercial rapeseed meal and soybean meal as sources of protein for starting growing and finishing pigs and young rats



Canadian Journal of Animal Science 57(4): 663-678



Eighty 3-4 wk old crossbred pigs averaging 5.3 kg in weight at allotment were fed experimental diets during starting, growing and finishing phases to compare 'Tower' rapeseed meal (00-RSM) and commercial rapeseed meal (C-RSM) as the sole or partial replacements for soybean meal (SBM). Barley and wheat were the main energy sources with varying amounts of animal tallow to provide isocaloric diets on a digestible energy basis. A 50/50 isonitrogenous combination of 00-RSM + SBM resulted in feed intake, daily gain and feed/gain ratio similar to results with pigs fed SBM as the sole protein supplement during the 3 phases. Complete substitution of SBM or 00-RSM resulted in reduction (P < .05) of feed intake during the starting phase as well as lower (P < .05) daily gain and inferior (P < .05) feed/gain ratio during the growing phase. Partial substitution of C-RSM for SBM resulted in reduction (P < .05) of feed intake during the starting and finishing phases. Complete replacement of SBM with C-RSM resulted in a depression (P < .05) of daily gain during all 3 phases of the experiment, inferior feed/gain ratio during the starting and growing phases compared with pigs fed the other 4 diets and lower (P < .05) feed intake during the starting and finishing phase compared with pigs fed the SBM diet. These findings were confirmed in a rat experiment. Carcass characteristics of pigs were not greatly affected by experimental treatments. A trend of lower digestibility of energy, N and amino acids was noted by complete replacement of SBM with either source of RSM in the pig and the rat experiments.

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