S. L. Branton, B. D. Lott, J. D. May, W. R. Maslin, C. R. Boyle, G. T. Pharr, The Effects of F Strain Mycoplasma gallisepticum, Mycoplasma synoviae, and the Dual Infection in Commercial Layer Hens over a 44-Week Laying Cycle When Challenged before Beginning of Lay. I. Egg Production and Selected Egg Quality Parameters, Avian Diseases, Vol. 41, No. 4 (Oct. - Dec., 1997), pp. 832-837
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Branton et al. (1997) studied this question.