Abstract: This trial was conducted to study the effects of feed enzyme preparation on the production and breed performance and digestibility in laying breeder hens with enzyme Allzyme. Nine hundred and seventytwo 24weekold Roman brown parentbreeding layers were randomly allocated to 3 treatments with 6 replicates and 54 birds each replicate. Three treatments were positive control groups, negative control groups and enzyme addition groups. The feed was based on maize and diverse meals, and the positive control diets contained 0.40% nonphytate phosphorus and no enzyme preparation, the negative control diets contained 0.21% nonphytate phosphorus and no enzyme preparation, and the enzyme addition diets were formulated by the addition of 200 g/t Allzyme to the negative control diets. The trial was continued for 18 weeks. The results showed that the production performance of laying breeder hens had no significant difference (P>0.05). Dietary treatments had no effects (P>0.05) on the production performance. The addition of 200 g Allzyme SSF per ton to replace 75% dicalcium phosphate in breeding layers diets can reduce feed costs and improve economic efficiency of laying breeder hens with no adverse effects on production and breeding performance.

Key words: feed enzyme preparation; laying breeder hens; production and breed performance; digestibility