BSE and FMD, nor shall we fall back from modern husbandry to a primitive and extensive mode of farming. It is a certain path for us to develop modern agricultural technologies so that we may meet our demand in grain and meat. Nevertheless, there are lessons to learn. When apply ing our creativity to the cultivation and mod ification of species, or to the growth of plants and animals, we must abide by the natural law and ensure the sustainable development of agriculture and livestock industrBSE and FMD, nor shall we fall back from modern husbandry to a primitive and extensive mode of farming. It is a certain path for us to develop modern agricultural technologies so that we may meet our demand in grain and meat. Nevertheless, there are lessons to learn. When applying our creativity to the cultivation and modification of species, or to the growth of plants and animals, we must abide by the natural law and ensure the sustainable development of agriculture and livestock industry