Australian scientists are trying to give kangaroo-style stomachs to cattle and sheep in a bid to cut the emission of gre......

羊有四个胃,功能各不同。这四个胃,分别有什么作用呢?只有了解其特性及功能才能养好羊,提高农牧民养羊经济效益。1瘤胃瘤胃是羊4个......