FATTENING RESULTS OF FINISHING PIGS FED SECOND-STAGE DIETS WITH A HIGH CONTENT OF OAT BRAN AND SOYBEAN OIL

Abstract

The experiment was performed on 48 crossbred ( Polish Landrace x Duroc) finishing pigs divided into three feeding groups: group I (control) – fed a cereal-soybean diet (diet 1), group II – fed a diet containing 15% oat bran and 3% soybean oil (diet 2), group III – fed a diet containing 30% oat bran and 5% soybean oil (diet 3). The pigs were kept in straw-litter pens (two animals, one gilt and one barrow, in each), and they were fed ad libitum from 70 to 110 kg live weight. A second-stage diet containing 30% oat bran and 5% soybean oil (group III) significantly decreased average daily weight gains and feed conversion efficiency, compared with control group I and group II. Different feeding had no significant effect on the lean meat and fat content of carcasses and the proximate chemical composition of meat. Diet supplementation with oat bran and soybean oil contributed to a significant increase in alpha-linolenic acid concentrations in the lipids extracted from m. longissimus dorsi (m.l.d.). The higher content of crude fiber and crude fat in diets resulted in a highly significant increase in HDL concentrations and a significant increase in triacylglycerol levels in the blood serum of pigs, yet it had no influence on total cholesterol levels in meat (m.l.d.) and liver samples.