Miles , D.M., et al. “Effects of Supplemental Dietary Phytase and 25-Hydroxycholecalciferol on Excreta Characteristics and Nutrient Content from Commercial Layers Inoculated Before or at the Onset of Lay With the F-Strain of Mycoplasma Gallisepticum”. International Journal of Poultry Science, vol. 20, no. 5, Apr. 2021, pp. 209–214, https://doi.org/10.3923/ijps.2021.209.214.