他们的结果证明，在现生哺乳类中，鲸豚与偶蹄类最亲近；骆驼、河马、猪及牛羊等反刍动物都属于偶蹄类。
Experts agree that hippos belong to the mammalian order artiodactyla, a group of even - toed, hoofed creatures whose extant representatives include camels, pigs and ruminants such as cows.
皂苷是一类对反刍动物瘤胃发酵有调控作用的植物次级代谢产物。
Saponin is a type of plant secondary metabolite, which contributes to the modulation of rumen fermentation.
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