Lash egg is not contagious, however, the reason for the lash egg could be contagious. I put my lash egger on a broad-spectrum antibiotic. I used oxytetracycline, for 10-days. You can use Tylan/Tylosin as well, however, I have had more success with oxytetracycline.
This is my Penny. Owner didn't want her any longer, and didn't fix spraddle or curly toe paralysis when young. I took her at 14-weeks old. Vet said too late to do anything.
Thank you so much @Ciggynel, for helping this hen. How is she doing? @GlicksChicks, I have a severely disabled barred olive egger that has a very long beak.
Welcome to BYC. Congratulations on your cockerel. Roosters are awesome. I am sorry you lost your last flock. If you would like any recommendations specific to predator security, many here will help.