Abstract
The effects of feeding resistant versus highly digestible protein (potato protein, PPC and casein, CAS, respectively) supplemented with fibre of high or low fermentability (potato fibre, PF and cellulose, CEL, respectively) on the SCFA concentration in different segments of pig large intestine, were studied. Four groups of six pigs of 15 kg body weight were fed during 21 days on cereal diets containing CAS or PPC and supplemented with PF or CEL. Total SCFA concentration was not affected by protein source and was significantly greater on PF than on CEL in middle colon. Butyrate concentration tended to be and was greater on PPC than on CAS in caecum (P = 0.07) and proximal colon (P = 0.02) while in the middle colon it was greater only after feeding PPC with PF (P interaction = 0.02). Feeding PPC increased also valerate concentration in caecum and proximal colon while it decreased or tended to decrease acetate in the middle and distal colon. Feeding PF increased acetate in the middle colon, and butyrate in distal colon. It tended also to increase or increased isobutyrate in the middle and distal colon.
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