Animal Science Abstract
Ileal digestibility of raw and autoclaved kidney-bean (Phaseolus vulgaris) seed meals in cannulated pigs
L. A. Rubio1,A
AEmail: lrubio@eez.csic.es
1Estación Experimental del Zaidín, Unidad de Nutrición, Profesor Albareda 1, 18008 Granada, SpainAbstract
Five castrated male pigs (100±2 kg mean live weight) fitted with T-shaped ileal cannulae were used to determine ileal digestibility of raw or autoclaved (136ºC, 3 min, 2·3 bar) kidney-bean seed meals, which were included (536 g/kg) in the diet as the only protein source. A protein-free and a diet based on hydrolysed casein were used to estimate endogenous protein secretion. Apparent ileal digestibility of dry matter was lower ( P<0·05) for raw compared to autoclaved kidney-bean meal. Apparent and true ileal digestibilities of raw kidney-bean meal were not only lower ( P<0·05) than those of autoclaved kidney beans, but negative or close to zero for N and some amino acids. Ileal N (36·9 g/kg food ingested) and sialic acid (3·5 g/kg food ingested) flows in pigs given the raw kidney-bean-based diet were higher ( P<0·05) than those of pigs given the autoclaved kidney-bean diet (respectively 8·9 and 1·4 g/kg food ingested). Autoclaved kidney beans contained 364 and 143 g/kg of starch and non-starch polysaccharides respectively, the ileal digestibilities of which were 0·79 and 0·26. Among individual non-starch polysaccharide sugars, apparent ileal digestibility values were between 0 (rhamnose) and 0·38 (arabinose). Ileal apparent digestibility of total oligosaccharides in the autoclaved kidney bean diet was 0·52, and total amounts of oligosaccharides digested was 18·6 g/kg food. Among individual short-chain fatty acids in ileal contents, only propionate values were significantly ( P<0·05) different between pigs given raw or autoclaved kidney-bean diets. Lactate concentration in ileal contents was higher ( P<0·05) in pigs given autoclaved compared with raw kidney beans. Ileal digestibility of autoclaved kidney-bean meal in the 10-kg pigs was poorer than that of other raw legume-seed meals such as lupins and chickpeas in other studies. The potential health implications of these results are also discussed.
Keywords: autoclaving, digestibility, ileum, Phaseolus vulgaris, pigs.
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