If you know anything about broilers this will not rock your world. There’s a lot of incomplete information and thoughts in here. It’s a good review, but further research is needed.
Protein and intake levels by age for broilers and layers, includes ingredients for home ration mixes.
Medical Issues with Broilers Chickens:
Print this out and put it with your birds. Cornish cross especially are really susceptible to illness and this will get you started in tracking down the problem to find a solution. Jeff Mattocks knows his stuff.
A very technical explanation of the illness ascites which presents as purple and bloated chickens with fluid in the cavity.