From my understanding, generally speaking rabbits are a leaner meat than rats. Now I’m not sure about comparisons of younger ones. I’d expect a weaned rat to be leaner in fat than a large adult rat. I will say that I had a Ball that would only eat gerbils which was a real pain in the butt so my experience is they can can get stuck on one particular food type. Guinea pigs are really big as a food staple in South America so I’m guessing they have a good nutritional value but rabbits would still be better.
