Currently, chickens in the U.S. are not stuned before their throats are slit, so they suffer miserably as they either bleed to death or are boiled alive in the feather-removal scalding tanks. Make sure that every slaughterhouse is subject to unannounced audits by a qualified animal-handling expert such as McDonald's inspector Dr. Temple Grandin. Unannounced audits of all of Burger King's slaughterhouses should be mandatory, and those that don't measure up should be cut off. Require suppliers to humanely kill any animals who arrive at the slaughterhouse unable to walk, with broken limbs, or in severe pain. Most egg-laying hens are crammed seven or eight to a tiny cage and can not even stretch their wings.
Battery cages are already illegal in much of Europe.
Stop buying eggs from suppliers that withhold food and water in order to increase egg production. Buy chickens who are raised truly free-roaming only. Intensively reared chickens are crammed into crowded warehouses with tens of thousands of other birds, where they have less space per bird than a standard sheet of paper. Chickens require a nesting area, sunning area, shelter, and plenty of food and fresh water that is spread out far enough to prevent the birds from fighting over it. Buy chicken flesh and eggs only from suppliers that don't debeak chickens.