Resumo

ROMERO-NUNEZ, C. et al. Effect of a phtyase from aspergillus niger on nutrient digestibility and activity of trypsin and chymotrypsin in weanling pigs. Arch. zootec. [online]. 2009, vol.58, n.223, pp.363-369. ISSN 1885-4494.

Two experiments were conducted to evaluate the effects of addition of fungal phytase (Aspergillus niger) in activity of trypsin and chymotripsin and nutrient digestibility in crossed pigs (Yorkshire x Landrace, 11.46 kg BW). In both experiments it was used a basal diet elaborated with sorghum and soybean meal, the treatments (T) were the following: T1, basal diet, and T2, basal plus 500 units of phytase activity (FTU) per kg In the exp. 1 six cannulated pigs in the pancreatic duct were used, which were adapted to the diets during 5 days before sample collection. The collection of pancreatic juice was done at 15 min interval from 08:00 to 20:00. The feed was offered twice per day. In the exp. 2, twenty pigs were fed with similar diets than exp. 1. The phytase did not show effects in the weight and the length of the pancreas, or either in the activity of the trypsin and chymotripsin. The addition of phytase increased the digestibility of protein (p<0.10) from 78.81 to 81.60% and NDF (p<0.11) from 81.87 to 85.54%. No differences were observed in digestibility of Ca, P and Fe. The digestibility of Mg and Zn were also not affected by phytase. In conclusion, these results indicate that the addition of fungal phytase to pig diets did not affect trypsin and chymotrypsin activity neither total mineral digestibility in gastrointestinal tract.

Palavras-chave : Piglets; Enzymes; Digestion; Pancreas.

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