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Die Bodenkultur - Journal for Land Management, Food and Environment
W. ZOLLITSCH, W. WETSCHEREK and F. LETTNER:
Use of soya-expeller in rations for pig fattening
Non-roasted soya-expeller which had been produced from Austrian soybeans (varieties Simpson, Evans, McCall) was used in rations for pig fattening. Effects on fattening performance, carcass yield, meat quality and composition of fat were investigated in two experiments.
The first experiment was conducted at a practical farm using two groups with 112 pigs total (8 boxes with 14 animals each). Rations consisted of 77 % corn cob mix (CCM) and 23 % supplementary feed (SF) which contained 63 % of soya-expeller (group 2) instead of soybean meal and faba beans (group 1).
The second experiment was conducted at a test-station using two groups with 24 pigs each. Two pigs were kept together in one box. They were fed barleybased pelleted all-mash feed. In the ration of group 2 soybean meal and barley were substituted by soya-expeller.
In the first experiment use of non-roasted soya-expeller resulted in deterioration of fattening performance: daily weight gain of group 2 was about 8 % lower compared to group 1. In the second experiment differences between groups were statistically not significant.
Use of non-roasted soya-expeller should not be recommended for pig fattening because of negative effects on fattening performance.
Due to product quality high amounts of soya oil should not be incorporated especially in corn-based rations.
Key words: pig fattening, soya-expeller, trypsin-inhibitors, fatty acids.