Evaluation of Microbial Phytase in Broiler Diets

    Two trials were conducted to evaluate the efficacy of a new microbial phytase (Phyzyme XP) for broiler chicks. Trial 1 used 192 8-d-old male broilers in a 14-d trial to assess growth and nutrient utilization. Dietary treatments (221.9 g/kg CP) included a positive control [5.0 g/kg nonphytate P (NPP)], negative control (1.2 g/kg NPP), and negative control plus 500 or 1,000 phytase units/kg of diet. Phytase addition increased weight gain, feed intake, feed efficiency, and tibia and toe ash (linear, P ??0.01) with tibia ash also responding quadratically (P ??0.05). Apparent ileal digestibility of P (linear and quadratic, P ??0.05), tryptophan, and valine (linear, P ??0.05) also increased. Linear and quadratic responses were observed for retention of DM, nitrogen, P, and several amino acids (P ??0.05) with added phytase. Trial 2 utilized 576 1-d-old male broilers over a 42-d period to evaluate growth performance. Diets were formulated for starter (222.7 g/kg CP) and grower (201.5 g/kg CP) phases and included a positive control (starter and grower, 5.0 and 3.8 g/kg NPP, respectively), negative control (starter and grower, 2.4 and 1.8 g/kg NPP, respectively), negative control plus 500, 750, or 1,000 phytase units/kg, and negative control plus 500 phytase units/kg of Natuphos phytase. Phytase increased weight gain and feed intake (starter, grower, overall) as well as feed efficiency during the starter period (linear, P ??0.05). Feed intake was also improved during the grower period and overall (quadratic, P ??0.05). Tibia and toe ash of birds fed for the first 21 d increased (linear, P ??0.05) with tibia ash also increasing quadratically (P ??0.05). Overall, tibia and toe ash were improved due to phytase addition (linear and quadratic, P ??0.05). In conclusion, this microbial phytase, derived from Escherichia coli and expressed in Schizosaccaromyces pombe, elicited improved growth performance, bone mineralization, and P utilization in broiler chicks
    Document information
    Product / service: Phytases
    Publication date: 01/01/2004
    Species: Poultry, Broiler
    Authors: Dilger RN, Onyango EM, Sands JS, Adeola O
    Doctype: Publications & Citations
    Publication / conference: Poultry Science, volume 83
    Regions and countries: Global
    Keywords: amino, acid, acids, apparent, ileal, digestibility, ash, birds, bone, mineralization, broiler, chick, chicks, diets, broilers, coli, control, cp, dan, diet, dietary, digestibilities, dm, efficacy, efficiency, escherichia, evaluation, feed, intake, gain, grower, growth, performance, male, microbial, phytase, natuphos, nitrogen, nutrient, utilization, p, phyzyme, xp, response, retention, starter, tibia, toe, treatment, tryptophan, valine, weight
    Production challenge(s): Phosporous, Environmental, Performance growth
    Diets: All diets
    Brands: Axtra® PHY, Phyzyme® XP, Optimize Feed, Phycheck, FASTKit assay
    Resource ref: 7911
    This material is related to a conference
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