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Using Enzyme Supplemented, Reduced Protein Diets to Decrease Nitrogen and Phosphorus Excretion of White Leghorn Hens |
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Jacqueline P. Jacob, Sami Ibrahim, Robert Blair, Hwan Namkung, In Kee Paik |
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| Abstract |
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An experiment was conducted to investigate the effect of supplementation of commercial phytase and 棺-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 棺-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 棺-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 棺-glucanase had no positive effects on laying performance or reduction of DM, N and P. |
| Keywords:
Layer; Enzymes; Phytase; 棺-glucanase; Dietary Protein; Egg, Nitrogen |
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