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I see. Do you think that if they were given a high-protein diet (say crushed cat food, and access to free-range) that their size might be improved upon if I worked with 'em for a couple generations?
The feed makes less difference than does the genetics you start with. Overall size could be increased SLOWLY over many years, I'm talking about a decade minimum to make real strong progress. Even then, if they are not meaty to begin with, you will just increase overall size without adding muscle mass. Much faster( and ultimately cheaper!) results can be obtained by buying the best breeder birds you can get, and/or by crossing in something like a shamo or asil to bulk them up. I'm working on increasing size and muscle mass myself, been on it now for 4 years, and figure if I see good progress in 10 years I'll be fortunate. Realize that most of the hatchery ones have a body more like a leghorn under all those feathers than a game or an asil. When I'm done, I'd love to see them hit standard weights, with a meatier frame. Patience is key .