Abstract
Seventy-two crossbred gilts were used in an experiment to evaluate low glucosinolate rapeseed meal (RSM), derived from the cultivar Tower, as a partial or complete replacement for soybean meal (SBM) in diets for gilts from 20 kg liveweight through two gestation and lactation periods. The supplementary protein sources for the three dietary treatments were: (1) SBM; (2) a 50:50 mixture (on an isonitrogenous basis) of SBM and Tower RSM: and (3) Tower RSM. The gilts were fed diets containing 17% protein from 20 to 60 kg, and diets containing 15% protein from 60 kg until the end of the second lactation. Fifty-one animals completed two reproductive cycles. There were no significant differences in litter size and weight at birth or weaning, sow weight changes in gestation or lactation, or gestation length in either the first or second parity. The results indicate that Tower RSM (containing 0.98 mg/g total glucosinolates) may be used as a partial or complete replacement for SBM in the diets of pregnant and lactating swine for at least two reproductive cycles with no apparent reduction in sow reproductive performance.
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