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The objective of this study was to evaluate the effects of microbial phytase on egg production and egg quality in older hens. A total of 216, 63-week-old Hy-line brown laying hens were distributed in a randomized complete design 10-week feeding trial of 3 dietary treatments with 12 replications per treatment and 6 hens per replication. The 3 dietary treatments were corn-soybean meal-based diets supplemented with 0 % (CON), 0.06 % (TRT1), and 0.12 % (TRT2) microbial phytase. Significantly higherdoi:10.2141/jpsa.0200001 fatcat:w7bsp7oapndsdnoajdeknjaxva