Resumen

LOZANO, A.P. et al. Phytase levels in rations for finishing pigs. Arch. zootec. [online]. 2011, vol.60, n.232, pp.839-850. ISSN 1885-4494.  https://dx.doi.org/10.4321/S0004-05922011000400001.

This experiment was conducted with the aim of evaluate the inclusion of different levels of phytase in the rations with high phytic acid concentration to finishing pigs on performance, carcass characteristics, and meat quality. The experimental treatments were: ration without phytase, and rations with phytase (500, 1000 and 1500 PPU). The rations were isonutritive, based on corn grain, soybean meal, and defatted corn germen meal ingredients and were offered ad libitum during 28 days before the slaughter. Were evaluated the pig performance, carcass characteristic, meat quality, lipidic oxidation and serum profile of iron, calcium an phosphorus and fecal profile of calcium and phosphorus. Thirty two pigs (Landrace X Large Withe), 16 male and 16 female, with 60.3±5.32 kg of initial weight, were allocated on individual pens. The experimental design was randomized blocks, using a 4 x 2 factorial model (4 levels of phytase and 2 sexes), been each animal considered a replicate. There was a better (p<0.05) feed conversion rate in groups receiving 1000 and 1500 PPU of phytase and a lower consumption of ration (p<0.05) in the group treated with 1500 PPU of phytase than the control group. It was observed a quadratic effect (p<0.05) for phosphorus levels in feces, where the best point was 998.24 PPU, and there were lower concentrations (p<0.05) of phosphorus in the feces of treated groups (500, 1000 and 1500 PPU) compared to the control group. The addition of phytase at the level of 1000 PPU is positive to reduce the phosphorus elimination and improve the feed conversion rate, without deleterious effects on meat quality.

Palabras clave : Minerals; Phytic acid; Performance; Environmental impact.

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