Greetings
HarryF1,
You should take some poop samples to a vet. Have them run a 'fecal float test', this will tell you if the chickens are infected with worms or coccidiosis. The cost is nominal, I pay $10 at U.C.Davis, and $20 at the vet's office.
The hen that is being attacked, may be sick with an infection. This is why it's important to get the fecal float test done. If she doesn't have internal parasites, she most likely has an infection of some kind, and will need to be treated for that. It's not good to worm a sick chicken, as this can cause the sick chicken to go down hill quickly.
I agree with
Lady of McCamley. It is common for a flock to attack a sickly member, to push out the weak or prevent disease in the flock. I am currently caring for a hen, that had that exact thing happen. She was being mounted by the oldest hen, and pecked by another when I found her, stuck half way under a ramp.
I separated her in a hospital pen on my patio, so I could observe her. I cleaned her up, and attended to her pecking wounds. She was eating, and drinking, but no egg after 2 days. Her poops looked OK. But, I know my hens and their personalities. Something was not right with her. Her eyes also looked almond shaped. So off to the vet we went.
An x-ray revealed no egg in the oviduct. So, it was determined that infection was brewing. After three days on antibiotic, she is doing great. She spends half of the day, in the hospital pen, for treatment and observation. Afternoons, out with the flock for supervised foraging. She is sleeping in the coop, in a small crate till I know she is strong enough to defend herself.
Also, anytime you get new chickens, it's good to quarantine them for a few weeks, before integrating them to an existing flock.
New Chicken Checkup:
- Examine them for internal (fecal float test) and external parasites (mites/lice).
- Check the vents for irritation, feces accumulation, or swelling.
- Check the keel bone, to see if it is sharply protruding, this indicates malnourishment.
- Look under the wings for lumps, or injury.
- Check inside the mouth for growths or discolorations.
- Feathering should be smooth.
- Leg scales should be smooth.
- Eyes should be round and glossy, bright.
- Wattles and comb are red.
These are my thoughts on your chicken's issue. I hope I have been helpful.
God Bless
