Poultry
Within poultry, there are two types of meats—white and dark. The different colors are based on the different locations and uses of the muscles. Dark meats occur in the legs, which are used to support the weight of the animals while they move. These muscles are designed to develop endurance for long-term use and contain a large amount of myoglobin, allowing the muscle to use oxygen more efficiently for aerobic respiration. In contrast the white meat, generally found within the breasts of the birds, are used for quick bursts of power which requires little of the meat-darkening myoglobin. Note that this holds for ground-based birds like chicken and turkeys – birds which use their chest muscles for sustained flight (such as geese and ducks) have dark meat throughout their bodies. Dark meat contains 2.64 times more saturated fat than white meat, per gram of protein. One commentator has pointed out that dark meat contains more vitamins.
Read more about this topic: White Meat