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石头是指自然界到处可见的各种各样岩石,一般人认为石头的价值是微不足道的,除了建房筑路外,别无多大用场。其实不然,随着现代科学技术进步及工农业发展,石头与人类的关系日趋密切,并已成为发展社会生产的重要物质基础。现介绍几种石头的用途。饲料石饲料石即矿物饲料。将有关的石头磨成一定的粒度添加到饲料中,就叫饲料添加剂。据国外报导,目前已用作饲料添加剂的石头有沸石岩、膨润土、皂石、凹凸棒石、海泡石、海绿石、碳酸盐岩等。由于此类岩石含有禽畜所需的各种有益元素和养分,故在饲料中添加适量的上述某种石头后可促使禽畜的健康生长,达到增产的目的。例如,
Stone refers to a variety of rocks that can be found everywhere in nature. Most people think that the value of stone is negligible. There is no use for any stone besides building a road. In actual fact, with the progress of modern science and technology and the development of industry and agriculture, the relationship between stone and human beings has become increasingly close and has become an important material basis for the development of social production. Now describes the use of several stones. Feed stone feed stone that is, mineral feed. The relevant stone grinding into a certain particle size added to the feed, called feed additives. According to foreign reports, currently used as a feed additive stone zeolite rock, bentonite, soapstone, attapulgite, sepiolite, glauconite, carbonate rock. Since such rocks contain various beneficial elements and nutrients required by livestock, adding a suitable amount of one of the above-mentioned stones to the feed can promote the healthy growth of livestock and achieve the purpose of increasing production. E.g,