Sussex19
Free Ranging
I think this is a good point you make here.but with them only being a year old last month and already having lost 4 to seemingly unrelated issues
The point is they are unrelated, so I don't think anything you are doing is causing it.
I think, being high production breeds, even though they are still quite young, you will just get more problems.
Hopefully, they will settle down, and the losses will get a lot less.
And there is the old saying, if you have livestock, you will have deadstock. The point being, sometimes things just happen, and you can't do anything about it.