In the production of veal "The calf is confined to a crate to restrict its movement and atrophy the muscles. This, combined with a liquid diet low in iron and roughage, makes the meat tender and anaemically pale. In the UK, where welfare standards are higher, crating has been illegal since 1990." according to BBC food.
Source: http://web.archive.org/web/20070529064739/http://www.bbc.co.uk/food/food...