Hi to everyone out there, I'm new to Backyard Chickens and just getting back into chickens after giving up in despair a couple of years ago, I personally had a very sad experience with ISA Browns. When we first moved out here to the country my one big ambition was to have chickens. So I built my coop and pen and bought 4 ISA Browns.They were a great bird that all laid like there was no tomorrow, docile,each one with its' own personality, made great pets and were a wonderful addition to the yard. Then after about 2 years one after another they all developed a prolapsed uterus and had to be put down. When I questioned the local vet about it he told me that here in Australia they are primarily a commercial breed, bred to do one thing and one thing only, lay large eggs until they drop dead usually at about 2 years or after laying between 600 & 650 eggs . A lot of egg producers keep them under lights so that they lay twice a day, the result being they live a much shorter life. When I asked why do that I was told that most birds slow down egg production after a couple of years and this left producers with 10's of millions of birds that were commercially unviable every year,but they were still healthy animals whose meat could not be used for domestic consumption. And that's where the ISA Brown fits in, the bird itself is useless for the meat trade but is suitable for the pet food industry and the fertilizer industry. The producer sees this as a win win situation 2 eggs a day till they drop dead then the carcass sold to the pet food and fertilizer industries with no worries about what to do with unviable birds. Another down side being the euthanasia of millions of day old ISA Browns cockerels every day, hence the difficult in obtaining the cockerels for domestic breeders . I don't know if it's the same in other parts of the world but that's how it seems to be here. It's very sad.