Using Enzyme Supplemented, Reduced Protein Diets to Decrease Nitrogen and Phosphorus Excretion of White Leghorn Hens

  • Jacob, Jacqueline P. (Department of Dairy and Poultry Science, University of Florida) ;
  • Ibrahim, Sami (Department of Animal Science, The University of British Columbia Vancouver) ;
  • Blair, Robert (Department of Animal Science, The University of British Columbia Vancouver) ;
  • Namkung, Hwan (Department of Animal Science, Chung-Ang University) ;
  • Paik, In Kee (Department of Animal Science, Chung-Ang University)
  • Received : 2000.03.10
  • Accepted : 2000.08.12
  • Published : 2000.12.01


An experiment was conducted to investigate the effect of supplementation of commercial phytase and ${\beta}-glucanase$ to wheat-soybean meal based layer diets. Control (17% CP) and reduced protein (13.5% CP) diets were compared with and without phytase and/or ${\beta}-glucanase$. Reducing dietary crude protein levels reduced the amount of N excreted by laying hens with no adverse affect on egg production or overall feed conversion ratio. There was, however, a slight reduction in average egg weight. When phytase was added to the control protein diets it was possible to reduce the level of dicalcium phosphate in the diet without a loss in performance and daily P output was reduced significantly. When phytase was added to the reduced protein diets, however, there was a dramatic loss in performance in the last four weeks of the study. Supplementation of ${\beta}-glucanase$ to wheat based layer diet did not appear to have beneficial affects in terms of laying performance and reducing nitrogen or phosphorus excretion. Combination of phytase and ${\beta}-glucanase$ had no positive effects on laying performance or reduction of DM, N and P.


Layer;Enzymes;Phytase;${\beta}-glucanase$;Dietary Protein;Egg;Nitrogen;Phosphorus

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