China has more than 300 million ha of exploitable grasslands, distributed mainly throughout Inner Mongolia, the basin between the Tianshan and Altai mountains in Xinjiang and on the Qinghai-Tibet Plateau. China has great numbers of over 400 species of domestic animals, including pigs, cattle, sheep, horses, donkeys, mules, camels, chickens, ducks, geese and rabbits. Since 1978, animal husbandry has developed rapidly; the outputs of meat, eggs, milk and leather products have doubled and redoubled, and they have been exported in large quantities.