It's known that carcass composition depends on many factors including breed , age of animal, Feeding and type of food, fattening period and the degree of fatness so it is difficult to give an exact estimate for your question
These are very interesting responses. Actually, considering those factors what would be the appropriate estimate for carcass yield and meat: bone ration? Sometime the carcass yield is as low as 43-50% in Zebu in Uganda but because of progression in genetics, improvements in feeding and production systems which is a trending thing, gradual increase in carcass yields have been realized. As such figures can be cast in stone or generalized rather its important that people engaged in food production ought to have working estimate to understand carcass yield later meat yield after de-boning. Variables on biological systems are never fixed and such definitely expected to vary in that context.