I need some advice for my father in law's flock.
He has a mixed flock of about 15 including a rooster. He got these chickens from various neighbors and strangers. He did not practice biosecurity with each addition; each new hen was just added to the flock when he got it. (I warned him but he's very old school) From looking at them the best I could it seemed like all were healthy, no discharges, no sneezing, etc. (I didn't handle them because I wasn't about to bring anything home to my flock.)
A handful were finishing up molting so no eggs from them. The other hens were all laying fine until about a month ago. One of the RIR's starting eating her eggs so my FIL separated her within a day of it happening. Now he has a a couple more doing it.
My strong strong suspicion is that it's from lack of certain nutrients. As mentioned, he's very old school and would feed them A LOT of stale bread from the bread store every day along with various kitchen scraps. He gives them laying mash as well. However only recently has he been using the mash correctly with adding water to it. The mill he got it from neglected to tell him how to properly use it and I discovered the issue about 2 wks ago.
Please don't think my father in law doesn't love his flock because he adores them. He knows now that he can't feed them like they did when he was a child haha.
How can we help stop his egg eaters WITHOUT culling?