Well I don't believe I've said that every Isa Brown chicken will get every disease. My friend told me today over the phone that he will need to kill 45 Isa Brown chickens. I could always make a video, though I do live a reasonable distance away from him. I saw his chooks when he bought them from a egg farmer who said they were '2 years old'. He bought 100, and some were pretty good.
He sold to me 5 ISA Brown chooks which looked pretty good. He'd picked out the best and taken some to the markets, I bought the 5 then. Best of the best you might say. Two of those have died so far in the few months I've had them. One at a time they'd stopped eating, didn't get back onto the perches with the other chooks (flock size about 24 assorted breeds), didn't return to the coop at night and I'd find them and gently carry them inside.
I haven't lost any other breed to disease, just the ISA Browns, I think one or possibly two of the ISAs left still lay occasionally, very very weak shelled eggs that usually break with handling, or are broken a little in the nest.
One of the ISA Browns has a chronic problem breathing and often has a foamy eye. She can get around and up onto the perches, but doesn't lay, but I feel she has a reasonable life even though she is ill. She usually doesn't forage. The other breeds all do, often in neighbors yards, and they cross the roads too (!)
So out of the 100 my friend got, 45 are to be put down, I have seen those 45 and such a very very heartbreaking sight they are. My friend loves animals, and cares well for all the animals I've seen him and his family keep. The ISA Browns no longer have anything looking like a feather coat, most have stalks of feathers coming out of their wings. A lot are pretty much bald, they all look very very unhealthy. I guess I can take some pictures if you'd like to see, though it's not pretty in any way.
ISA Browns that are over 2 years old, about 2 1/2 years, look to me more what you'd see in the newspaper with "RSPCA raid" written over the top of it. I got the best of the best and 40% are dead, 20 % are sick and about 20% lay on occasion. I don't think that what I've said above was controversial at all.
I have read somewhere that they cannot make new feathers because they lack something genetically and get to pecking. Luckily my 5 don't do that so much that it is any kind of problem.
I think mine have an excellent diet, apart from the wheat, pellets and grit, my yard is a haven for living things with every bug and critter a chook could want and lovely friendly neighbors who drop off scraps. Another neighbor has a little dog that recently visits about the same time the neighbor who drops off scraps does, and apparently that explains the little dog getting fat recently according to the owner. My chooks and I do not mind at all, it's just doing what a puppy does and the chooks get plenty of the scraps. A feral cat was an actual problem but that has been fixed since.
So 60% of the best of the best are sick or dead, and 45 are going to be put down because they are in a condition that nobody would argue with the course of action. Photos, video, proof? I don't know what you'd like or if you'd like anything at all, but I honestly believe it is quite fair or even generous. They do lay everyday from the time they start laying until they reach 2 years and are economical to keep.
I'm not sure that pretending there is no problem when there is a ISA Brown breed related problem does justice to the poultry keeping community, INCLUDING commercial breeders and egg producers. Do we really want to push an open and honest industry into something more dark and dishonest and shady ? Or permanently put off backyard keepers from keeping poultry ? How would this site function if every family got ISA Browns and watched them die horribly and fast in front of the kids. Would that put them off keeping chicks, and therefor this site, or would it be better to openly and honestly discuss that ISA Browns like all breeds have problems and openly honestly talk about those problems, and recommend breeds that suit the owner. ISA Browns are great for egg producers, but one size doesn't fit all, and pretence doesn't help anyone. Am I wrong on all of this ?