I bet they're older than. Ascites I believe can be caused by poor ventilation and with the feather plucking too, I bet these poor girls were locked in a cramped space some of the time. Or perhaps the feather plucking is due to low protein. I wonder if you gave them flock raiser food or something with about 20% protein or higher like game bird food (along with supplemental oyster shell) that they would start laying a bit better due to less stress