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

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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
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Evaluation of Microbial Phytase in Broiler Diets

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