FIBER DIGESTION AND WEIGHT-GAIN IN GUINEA-PIGS FED DIETS CONTAINING DIFFERENT FIBER SOURCES

The effects of different fiber sources on feed intake, weight gain and digestibility of fiber were examined in guinea-pigs fed pelleted diet s containing alfalfa meal, oaten hay, beef pulp and commercial hay cub es mixed with a basal diet at ratios of 3:1 (75% in the diet), 1:1 (50 %) and 1:3 (25%). The basal diet contained 50.0% corn, 4.1% wheat, 22. 1% wheat flour and 17.7% corn gluten meal. Food intake increased as th e amount of fiber source was increased, but not in the case of beef pu lp. The most digestible fiber (ADF and NDF) was that of beet pulp. App arent digestibility of dry matter decreased with increasing ratios of fiber source to the basal diet for all fiber sources, but fiber and cr ude protein digestibilities varied and depended not only on the ratio of fiber to the basal diet but also on the source of the fiber.