Fibrolytic enzymes and phytase in diets for pigs different substrates

The objective of the study was to evaluate the addition of phytase (P) and pectinase, glucanase and hemicellulose (PGH) activities on sorghum-soybean-canola based diets, and a xylanase (X) on diets with dry distillers grain with solubles (DDGS) on the ileal and fecal digestibility of nutrients (Exp 1) and the growth performance (Exp 2) of growing-finishing pigs. In Exp 1, two Basal diets were formulated (81: sorghum-soybean-canola and B2: sorghum-soybean-canola + DDGS) and the treatments were: 1) B1+P, 2) B1+P+PGH, 3) B2+P, 4) B2+P+PGH, 5) B2+P+X, and 6) B2+P+PGH+X. Exp 2 included four treatments: 1) Positive control (sorghum-soybean-canola) with normal energy; 2) Same as 1, but low in energy; 3) Same as 2 +F+PGH, 4) Same as 3+GSDS +X. In Exp. 1, the ileal energy digestibility was improved (P<0.05) with +P+PGH, +P+X and +P+PGH+X and the fecal energy digestibility was improved (P<0.05) with +P+X. The PGH released 122 kcal at the Heal level and the X released 147 and 132 kcal of DE/kg of feed at the ileal and fecal level. In Exp 2, the feed efficiency between the Positive control and the Low-energy +P+PGH Treatment was similar (P<0.01), but the Low-energy +P+PGH Treatment had higher (P<0.01) energetic efficiency. The energetic value of DDGS was improved with the addition of P, PGH and X, but the growth response observed in this trial was not consistent.