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Feed formulation using phytase in laying hen diets¹

F. G. Silversides^*,2 and M. Hruby

^* Agriculture and Agric-Food Canada, Agassiz Research Centre, Agassiz, British Columbia, Canada V0M 1A0; and Danisco Animal Nutrition, 8362 Tamarack Village, Woodbury, MN 55125

² Corresponding author: Fred.Silversides{at}agr.gc.ca

Lohmann LSL-Lite and Classic Brown laying pullets were reared and caged at the Agassiz Research Centre following recommendations of the management guides. At 30 wk of age, these hens were fed 1 of 5 diets per strain following the Lohmann nutrient recommendations. In addition to a control treatment, diets were formulated to contain 300 or 600 U/kg of phytase, with or without enzyme inclusion, where the phytase was assumed to cause the release of P, Ca, energy, and protein. Diets were changed at 45 wk to follow a phase-feeding program, but treatments remained the same. These dietary changes did not result in major changes in measures associated with P deficiency, likely because the management guides suggest P levels that largely exceed the requirements of the birds. Rather than adding high levels of inorganic P to layer feeds, the safety margin currently included in recommended dietary specifications could be provided by the addition of phytase. This would reduce the negative environmental effects of intensive poultry production that are associated with P excretion.

Key Words: layer • phosphorus • phytase • feed formulation

¹ Mention of a trade name, proprietary product, or specific equipment does not constitute a guarantee or warranty by Agriculture and Agri-Food Canada and does not imply its approval to the exclusion of other products that may be suitable. Agassiz Research Centre Contribution Number 765.