Non-starch polysaccharides and broiler performance on diets containing soyabean meal as the sole protein concentrate [chickens]
1993
Irish, G.G. | Balnave, D. (Sydney Univ., Camden (Australia). Dept. of Animal Science)
The total water-soluble and water-insoluble non-starch polysaccharides (NSP) were determined in 7 soyabean meals processed in Australia, 3 soyabean meals processed in the U.S.A. and 1 sunflower meal processed in Australia. Broiler chickens fed diets containing soyabean meal as the sole dietary protein concentrate grew significantly more poorly than broilers fed isoenergetic and isonitrogenous diets in which approximately 25 percent of the soyabean meal was replaced with sunflower meal. There was a significant negative correlation between the water-soluble xylose content of the soyabean meals and the improvement in growth observed with sunflower meal supplementation. Multi-enzyme preparations designed to act on soyabean meal NSP substrates failed to induce any improvement in the growth of broilers fed soyabean meal diets. The poor performance of broilers fed the soyabean meal diets did not appear to be related to inadequate processing or the NSP content or composition of the soyabean meals. Measurement of free sugars in the supernatant of the digesta in the ileum indicated that the stachyose derived from the oligosaccharides of soyabean meals appeared to exert an antinutritive effect when soyabean meal was present at high concentrations as the sole protein concentrate in broiler diets.
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