Effects of a Prelay 6/85-Strain Mycoplasma gallisepticum Inoculation Alone or in Conjunction with Subsequent F-Strain M. gallisepticum Inoculations During Lay on the Internal Egg Characteristics of Commercial Egg-Laying Hens1,2

ABSTRACT The effects of a prelay 6/85-strain Myco-plasma gallisepticum (6/85MG) inoculation alone or in con-junction with subsequent F-strain M. gallisepticum (FMG) inoculations during lay on the internal egg characteristics of commercial egg-laying hens were investigated. In the first 2 treatment groups, birds were sham inoculated or were inoculated with 6/85MG at 10 wk of age. In a third treatment group, birds were inoculated with 6/85MG at 10 wk in conjunction with a subsequent inoculation of FMG at 22 wk, and in a fourth treatment group, birds were inoculated with 6/85MG at 10 wk in conjunction with a subsequent inoculation of FMG at 45 wk. Percent-age yolk weight, albumen weight, yolk moisture, an