Authors : F.J. Picon-Rubio , J.R.G. Kawas , H.D. Fimbres , R. Ledezma Torres , F.A. Santoyo and R. Espinoza Leija
Abstract: The phytase manufactured by microorganism fermentations, have an effects liberating phosphorus of phytic acid of feedstuffs. This study was designed to determine the effect of microbial phytase on feeding laying hens and determine availability and performance. Test diets on a corn-soy base were fed for 30 days with six treatments with three levels of phytase (0, 300 and 600 UF) with and without additional phosphorus, in the first experiment. Same diets were used in the second trial and last 7 days, to determine phosphorus apparent absorption. The result showed a feed intake was increased by phytase contents (p<0.0004) and levels of phosphorus (p<0.05) and both interaction (p<0.015). Daily body weight changes with similar effect where with phytase level (p<0.03), phosphorus level (p<0.0007) and their interaction. On egg production was showed similar effect of phytase, phosphorus and an interaction (p<0.005; 0.0001; 0.0001, respectively). On egg weight produced, no effect was observed by phytase or phosphorus (p>0.05). In the trial of apparent phosphorus absorption, P intake (g day-1) was influenced by phytase level (p<0.0001), phosphorus level (p<0.0001) and their interactions (p<0.0001). The same effects were showed on P excretion, by P level (p<0.0001) and phytase (p<0.0001). The P digestibility quantified as percent, was high on treatments with highest P level (p<0.002) and influenced by phytase (p<0.01). In conclusion, phytase and phosphorus level on laying hens diets, feed intake and body weight changes, increase. Phosphorus retention and apparent phosphorus digestibility were increased by phytase and phosphorus.
F.J. Picon-Rubio , J.R.G. Kawas , H.D. Fimbres , R. Ledezma Torres , F.A. Santoyo and R. Espinoza Leija , 2009. Effect of Phytase Microbial in Laying Hens Diets on Their Performance on Absorption and Use of Phosphorus. Journal of Animal and Veterinary Advances, 8: 1461-1465.