Bob veal, from calves that are slaughtered when only a few days old (at most 1 month old) up to 60 lb.[2]
Formula-fed ("white" or "milk-fed") veal, from calves that are raised on a milk formula supplement. The meat colour is ivory or creamy pink, with a firm, fine, and velvety appearance. They are usually slaughtered when they reach 18–20 weeks of age, 450 to 500 pounds (200 to 230 kg).[3]
Non-formula-fed ("red" or "grain-fed") veal,[4] from calves that are raised on grain, hay, or other solid food, in addition to milk. The meat is darker in colour, and some additional marbling and fat may be apparent. It is usually marketed as calf, rather than veal, at 22–26 weeks of age, 650 to 700 pounds (290 to 320 kg).
Rose veal in the UK (generally called young beef in Europe), is from calves raised on farms in association with the UK Royal Society for the Prevention of Cruelty to Animals' Freedom Food programme. Its name comes from its pink colour, which is a result of the calves being slaughtered at or after 35 weeks (8 months up to 12 months).[5]
Pasture-raised veal
Free-raised veal[citation needed] is from calves raised in the pasture with unlimited access to their mother's milk and pasture grasses. They are not administered hormones or antibiotics. These conditions replicate those of pasture-raised veal. The meat is a rich pink color. Free-raised veal is typically lower in fat than other veal.[citation needed] Calves are slaughtered at about 24 weeks of age.
Special-fed veal is from calves fed a balanced milk- or soy-based diet one fortified with 40 essential nutrients, including essential amino acids, carbohydrates, fats, dietary iron and other dietary minerals and vitamins. As of 2013, the majority of veal calves in the USA are special-fed.[