Resumen

DIOSDADO ESPINOZA, María Liliana; CORTES CUEVAS, Arturo  y  AVILA GONZALEZ, Ernesto. Efficacy of two bacterial phytase in the release of phosphorus in diets for growing chicken broilers. Rev. mex. de cienc. pecuarias [online]. 2017, vol.8, n.2, pp.121-128. ISSN 2448-6698.  https://doi.org/10.22319/rmcp.v8i2.4414.

The efficacy of two phytases (Citrobacter brakii and Escherichia coli) used in different doses (500 and 1,000 FTU) were evaluated in a diet deficient in phosphorus (0.15% available P) formulated with sorghum-soybean meal. To estimate the efficacy of the release of P evaluated phytases, inorganic phosphorus supplemented by mono-phosphate (MDP) to reach a final concentration of available P of 0.23, 0.31 and 0.39 % was used as reference. The basal diet deficient in P was supplemented as follows: 1) Without phytases, without MDP; 2) 0.08% MDP; 3) 0.16% MDP; 4) 0.24% MDP; 5) Citrobacter-500 FTU; 6) coli FTU-500; 7) citrobacter-1,000 FTU and 8) FTU coli-1,000. The treatments were applied to Ross 216 chickens (27 birds/treatment) 7 to 21 d old. Weight gain, feed efficiency and concentration of tibia ash and P was better in chickens receiving 0.39% PMD and 1,000 FTU of both phytase, with no differences in these levels between MDP and phytase treatments. The amount of phosphorus released was not affected (P>0.05) by type of phytase (average 0.142 %), with effect to level of phytase used (0.102 vs 0.182 % for 500 and 1,000 FTU respectively). The results indicate that supplementation 1,000 FTU / kg in both phytase in diets deficient in P results in weight gain and feed efficiency similar when the diets are supplemented with 0.24% MDP. Both phytases improved to 78.4 % utilization of phytate phosphorus in sorghum-soybean meal diets on growing chicks.

Palabras llave : Phytases; Citrobacter braakii; Escherichia coli; Phosphorus tibia; Tibia ashes; Broilers.

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