Effect of super dosing of phytase enzyme on the productive performance of laying hens under varying levels of phosphorous

Umesh, B.U., Chinnipreetam, V., Thirumalesh, T., Raju, M.V.L.N. and Nagalakshmi, D. 2024. Effect of super dosing ofphytase enzyme on the productive performance of laying hens under varying levels ofphosphorous. Indian Journal of Poultry Science, 59(1): 35–39.

A study was carried out to find out the effect of super dosing of enzyme phytase (One g contained 3410 U of phytase activity) supplemented at 300, 600, 900 and 1200 U/kg in layer chicken diets containing available phosphorus (AP) at 0.20, 0.3, and 0.40 per cent from 25 to 40 weeks of age. The inclusion of phytase in layer chicken diets containing different levels of available phosphorus 0.2, 0.3 and 0.4 per cent has significantly (P≤0.0l) improved the body weight of layer chicken when compared to unsupplemented groups. During the laying period the data on hen day egg production showed significant increase in egg production by supplementation of phytase. The significant (P<0.05) difference in overall (25-40 weeks) mean feed consumption was observed. The higher feed consumption (g/bird/day) was recorded in 0.2 AP (available phosphorus) without phytase. When phytase was added, the feed efficiency (kg of feed per dozen eggs) was higher than in the corresponding unsupplemented groups. The performance of layers fed diet with 0.20 per cent AP with 1200 IU per kg phytase supplementation was comparable to the BIS recommendation.