Effects of expanding on the nutritive value of wheat bran in pig diets

Authors

• Matti Näsi Department of Animal Science, P.O. Box 28, FIN-00014 University of Helsinki, Finland
• Kirsi Partanen Department of Animal Science, P.O. Box 28, FIN-00014 University of Helsinki, Finland
• Pasi Laurinen Department of Animal Science, P.O. Box 28, FIN-00014 University of Helsinki, Finland

DOI: https://doi.org/10.23986/afsci.72753

Abstract

Nutrient digestibility and protein utilization responses in pigs to the expanding process of wheat bran were evaluated. The digestibility and nitrogen balance study was conducted with nine finishing barrows (live weight of 75-93 kg) using a two-period reversal design with a 2 x 2 factorial arrangement of treatments. Wheat bran, untreated or expanded with a Kahl expander at a temperature of 105- 110°C, was included at two levels of 150 or 300 g kg-1 in barley-based diet supplemented with minerals and vitamins and fortified with lysine. The level of wheat bran in the diet had a diminishing effect on organic matter (OM), neutral detergent fibre (NDF), and hemicellulose (HC) digestibilities of the diet and tended to decrease those of crude protein (CP) and ash. Expanding of the wheat bran affected a non-significant improvement on ether extract (EE), NDF, acid detergent fibre (ADF) and HC digestibilities of the diet. Nutrient digestibilities of wheat bran and expanded wheat bran computed by regression were 0.64, 0.67 for OM; 0.70, 0,70 for CP; 0.47, 0.63 for EE; 0.35, 0.40 for NDF and 0.01, 0,16 for ADF, respectively. Feed values of untreated and expanded wheat bran were 11.45 and 12,08 MJ ME kg 1 DM, 7.84 and 8.02 MJ NE kg-1 DM and digestible crude protein 1 13 and 1 10g kg-1 DM respectively. The expanding process had no effect on nitrogen retention or protein utilization parameters measured. Processing of wheat bran with an expander had only a slight improving effect on the nutritive value of bran in pig diets.