INFLUENCE OF DIETARY FIBER IN VITRO MICROBIAL CECAL FERMENTATION IN MEXICAN HAIRLESS AND ASIAN PIG

Abstract

The objective of the present study was to evaluate and compare the in vitro cecal fermentation (by the gas production technique), in hairless Mexican pig and Asian pig, adding cellulose or starch as a substrates (0, 100, 200, 30 and 400 mg/ g DM). 12 pigs were slaughtered ( BW= 104±0.5 kg), six of each genotype, and after that take cecal content of each one, and it was made a pool using two pigs per genotype; after that per substrate (cellulose or starch) in each concentration, it were incubated in three flasks per pool with inoculums and it made three incubation series. The experimental design use the effect of genotype, substrate and concentration of the substrate added on the variables of in vitro fermentation. The averages of the data were compared by turkey’s method. In vitro gas production was higher (P<0.05) (mL / g DM) for hairless Mexican pig (206.8) vs Asian pig (180.2). The degradation fractional rate rhythm (b, 0.094 and c, -0.0127) and lag time (1.79) of the hairless Mexican pigs was higher than the Asian pigs (b, 0.074; c -0.102) and lag time (1.26); with the addition of carbohydrates as a substrates, in vitro gas production of potato starch was higher (P<0.05) than cellulose (238.3 vs 148.7 mL/g DM); the fractions b, c and lag time, there were differences (P<0.05) between substrates. The increasing addition of cellulose or starch had a lineal effect (P<0.05) with the gas production, level cero mg (133.46) to 400 mg of substrate (263.16 mL / g DM). Hairless Mexican pig had a higher cecal fermentation than the Asian pig, there was higher gas production (cecal fermentation) when added starch as a substrate.