The energy and protein value of double-low rape seeds for growing pigs

Abstract

Groups of 12 growing Landrace pigs with an average body weight of 55 ± 1.5 kg were fed a diet containing from 5 to 30% (Expt. 1) or 0 to 25% (Expt. 2) raw rape seeds. The digestibility of the diet was determined by either the indicator method (Expt. 1) or total collection method (Expt. 2). Metabolizability of energy was also determined in experiment 2. The apparent digestibility of crude protein was not dependent on the proportion of rape seeds in the diet, whereas the digestibility and metabolizability of energy decreased after the rape seed content exceeded 15% (Expt. 2) or 20% (Expt. 1). The mean coefficient of digestibility and metabolizability of energy and apparent digestibility of protein determined by multiple equations when the rape seed content equalled to 15 and 20%, were: 76.1 ± 1.8%, 66.4 ± 2.4% and 75.8 ± 3.5%, respectively. The digestible and metabolizable energy contents and digestible protein content in 1 kg DM of seeds were, respectively: 22.4, 20.2 MJ and 156 g.

Heat production in growing pigs fed rapeseed meal with various glucosinolate contents

“…It may be that the seeds used for the production of the RSM-24 contained more glucosinolates than allowed by Polish standards (30 /mioles/g fat-free DM) for double low rapeseed varieties. This supports the results of Raj et al (1993) who found four times more glucosinolates in seeds than in the extracted oil meal (22.5 and 5.5 ^moles/g fat-free dry matter, respectively). Experiment 1.…”