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Lactase activity and volatile fatty acid production in the cecum and colon of pigs fed a corn soy or 40 percent whey diet


, : Lactase activity and volatile fatty acid production in the cecum and colon of pigs fed a corn soy or 40 percent whey diet. Journal of Animal Science 46(6): 1648-1657

Market weight barrows of the Hampshire and Chester White breeds were used in 2 separate studies using a 2 .times. 2 factorial arrangement to determine the effect of the control (corn-soy) or 40% whey diet, and breed on the lactase activity and volatile fatty acid (VFA) production in cecal and colonic contents. The lactase activity in the cecal and colonic contents of the pigs fed the 40% whey diet was almost twice that of the controls (P < .01). The rate of VFA production in the cecal plus colonic contents of the Chester White and Hampshire Pigs fed the 40% whey diet was approximately 1 1/2 and 2 times that of controls, respectively. When 40 mM lactose was added to the incubation system, the VFA production increased approximately 30-40% over the production when no substrate was added. Total VFA produced during the 1 h incubation could supply approximately 9% (controls) or 15% (40% whey) of heat production at 2 times the basal metabolism rate of these pigs over that 1 h period. No difference with breed was observed in lactase activity, and lactic acid and VFA production. Cecum and colon of pigs fed a diet high in lactose are more capable of hydrolyzing lactose and producing VFA. This may contribute significantly to meeting their energy requirement.

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