I have a flock that varies in ages and noticed that all of them have protruding breastbones (in various stages). They have constant food & water, have been tested for worms, have been through antibiotics (suggested by a vet to rule out infection), I've tried doing electrolyte treatments - all with no positive results. They seem to have stopped losing weight, but none seem to be gaining weight. the vet had no further suggestions - thus I was wondering if anyone else has run into this problem and how they resolved it. Any suggestions are welcome.