Almost all hay and silage is consumed on the same farm as it is produced. Most supplementary feed crops are grown in the South Island, where the colder climate forces additional feeding of stock during winter. Wheat is mostly grown in the Canterbury region and is used for domestic consumption in bread and biscuits. By-products are bran and pollard, which are used for stock feed. Barley is used for stock feed and for malt. Some barley is exported, depending on international price fluctuations. Maize is grown in the Waikato and Manawatu-Wanganui regions as feed for chickens, pigs and cattle. Oats are grown in Canterbury and Southland for animal feed, and for rolled oats and oatmeal.