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I have 14 hens and 1 rooster, 3 male guineas outside in the coop. Inside, I have 1 hen sick with Marek's, but seeming to recover, 2 small roosters (about 6 weeks old). I have 11 chicks in the brooder inside right now.
I have had 9 die between the ages of 6-12 months, and another 7 die that were more than 6 weeks, but less than 3 months.
Breeds that have died were: EEs, NH, Barred Rock, Ameraucana, mutts, Partridge Rock, Light Brahma, Red Star.
They have an enclosed run that is about 240 sq ft, but mostly they free range in the backyard, which is about 1/2 acre, fenced.
Yes, if there are any toxic plants in the backyard, then they have access to them. I don't know which plants are potentially toxic. We have dogs, but they are used to the chickens and generally do okay supervised together. I recently had a problem with one of the hens going into the garage to lay, but have since fixed the hole so they can't get in there anymore (as far as I know), but there would definitely be toxic substances in there such as gasoline, oil, etc.
I usually feed scratch, once a day in winter (about 1 qt worth on the ground), and less often when it is warm. I recently disposed of the remaining scratch after thinking something might be contaminated and have since not gotten anymore yet.
Thank you for trying to help me on this.