Research Article
Evaluation of Phytase Nutrient Equivalency for Old Layer Hens
Department of Animal Science, Faculty of Agriculture,University of Tehran, Karaj, Iran
R. Gaykani
Department of Animal Science, Faculty of Agriculture,University of Tehran, Karaj, Iran
M. Shivazad
Department of Animal Science, Faculty of Agriculture,University of Tehran, Karaj, Iran
R. Taherkhani
Department of Animal Science, Faculty of Agriculture,University of Tehran, Karaj, Iran