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The increased use of corn co-products in swine diets has prompted interest in the ability of carbohydrase enzymes, such as xylanase, to assist the pig in fiber degradation. It has been proposed that, by breaking down arabinoxylans, xylanase enzymes can mitigate the negative effects of fiber on digestive efficiency. However, previous studies with xylanase in corn-based diets in swine have produced inconsistent results. A digestibility study was conducted in order to better understand how the enzyme impacts diet utilization in the pig by measuring the impact of xylanase on energy and nutrient digestibility in the small and large intestines and across the total tract. Thirty-two gilts (32.6 ± 0.47) were surgically fit with T-cannulae at the terminal ileum, housed individually, and assigned to 1 of 4 dietary treatments in a complete randomized design. Diets were arranged in a 2 × 2 factorial by adding 0% or 0.017% xylanase (Econase XT, Ab Vista) to corn-soybean meal diets with 0% (lower fiber: LF) or 30% (higher fiber: HF) corn DDGS. Three collection periods consisting of a 2 d fecal collection followed by a 3 d ileal collection occurred at average BW of 46.0 ± 0.4, 54.1 ± 0.4, and 70.3 ± 0.5 kg, respectively, for a total of 24 observations per dietary treatment. Pigs remained on the same diet through the trial to test the impact of BW on enzyme response. Ileal and fecal samples were analyzed to determine the apparent ileal digestibility (AID) and apparent total tract digestibility (ATTD) of GE, DM, NDF, ADF, and nitrogen, and the AID of starch and AA. Apparent digestibility values for fat were corrected for endogenous losses and true ileal digestibility (TID) and true total tract digestibility (TTTD) of fat was reported.

The impact of xylanase and body weight, and their interaction, on the utilization of dietary components in swine