Resumen

SAUER, Willem C; CERVANTES, Miguel; HE, Jinming M  y  SCHULZE, Hagen. Effect of phytase supplementation to barley-canola meal and barley-soybean meal diets on phosphorus and calcium balance in growing pigs. INCI [online]. 2003, vol.28, n.8, pp.476-481. ISSN 0378-1844.

Two metabolism experiments were carried out to determine the effect of microbial phytase addition to barley-canola meal and barley-soybean meal diets on P and Ca balance in growing pigs. In experiment 1, six barrows (29.6kg initial LW) were fed a barley-canola meal diet without or with phytase (500 units·kg-1) during 24 days, according to a crossover design. The diet provided suboptimal levels of P. In experiment 2, twelve barrows (53.4kg initial LW) were fed four barley-soybean meal diets, according to a two-period changeover design. Diet 1 was supplemented with inorganic P and Ca to meet requirements; diets 2, 3 and 4 contained suboptimal levels of P, diet 3 being supplemented with phytase; diet 4 was supplemented with both phytase and a mixture of xylanase and ß-glucanase. The supplementation of phytase to the barley-canola meal and the barley-soybean meal diets increased (P<0.05) digestibility and retention of P, as well as digestibility of Ca. Supplementation of both phytase and a mixture of xylanase and ß-glucanase to diet 2 gave similar (P>0.05) values for P retention and P and Ca digestibilities as for diets 1 and 3. In conclusion, phytase supplementation to the barley-canola meal and barley-soybean meal diets improved the utilization of P and digestibility of Ca; but no further effect was observed with the supplementation with the mixture of xylanase and ß-glucanase..

Palabras clave : Calcium ; Digestibility ; Phosphorus ; Phytase ; Pigs ; Retention .