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.
Highlights
MJ ME kg 1 DM, 7.84 and 8.02 MJ NE kg' 1DM and digestible crude protein 1 13 and 1 10 g kg' 1 DM respectively
M. et al Effects of expanding on the nutritive value of wheat bran cerning the responses of expanding to nutritive value of various feed ingredients, especially fibrous by-products, is scarce
The arabinoxylan content of wheat bran ranges from 206 to 262 g kg' 1 which makes the digestibility of the nutrients in bran low (Graham et al 1986, BachKnudsen and Hansen 1991)
Summary
MJ ME kg 1 DM, 7.84 and 8.02 MJ NE kg' 1DM and digestible crude protein 1 13 and 1 10 g kg' 1 DM respectively. Processing of wheat bran with an expander had only a slight improving effect on the nutritive value of bran in pig diets. The improving effect of expanding on nutritive value of barley or wheat middlings in diets for growing pigs has, been limited (Näsi 1992, Laurinen et al 1995, Siljander-Rasi et al 1995). Wheat bran has a rather high content of dietary fibre which decreases digestibily of nutrients and protein utilization. The processing treatments of fibrous feedstuffs are carried out in order to rupture the cell wall matrix and to modify the chemical structure of the constituents to render them more susceptible to enzyme degradation in the small intestine, improving the digestibility and utilization of nutrients. The objective of the current study was to investigate the effects of the expanding process of wheat bran on nutrient digestibility and protein utilization in pigs fed barley based diets
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