I am sorry about your losses. I raised mine with no special treatment. I raised them with turkeys and pheasants , all together and they are now outdoors , with a mixed flock and no heat. I had no losses. I’d consider the source. The only thing I did special was have them vaccinated at the hatchery.Can't seem to find out much information on the deathlayer chicks. They are very sensitive to cold as chicks and it is pretty expensive to find out this info. No one has any advice on what is best to hatch and raise them.. I recently purchased some chicks. they need it warmer than my other chicks do constantly. they have sugar in water and vitamins. were eating and drinking, no diarrhea, and then droopy wings for a couple days, quit drinking and lay down and die. outside temp went down from 98-100 degrees to 61, but they still had heat to set on a light which burned out one night. Lost 3rd one this morning. 3 left. doubt they will make it at this rate. I won't buy anymore. I have never had chicks that need as much as they seem too. Heat wise. and no one has info to go by on what to do. It seems that folks have trouble with them hatching and or growing up. I guess I can see why there are so few of those birds left.. They are beautiful though. I like Beauty, but also need production.