Peebles , E.D., M.R. Burnham, S.L. Branton, K.O. Willeford, and P.D. Gerard. 2012. “Effects of F-Strain Mycoplasma Gallisepticum Inoculation at Twelve Weeks of Age on Serum Vitellogenin Concentrations in Commercial Egg Laying Hens”. International Journal of Poultry Science 11 (10): 654–657. https://doi.org/10.3923/ijps.2012.654.657.