从几个现象说起有两群小雏鸡,分别管理在两个鸡舍内。它们喂给的饲料是一样的,都是由青饲料、根茎类多汁饲料和谷实类精料所组成。一个鸡舍内的地上只铺较薄的一层垫草,每天清早饲养员把积有鸡粪的垫草清除出去,而又重新铺上一层新鲜、清洁的垫草。可是另一个鸡舍却完全相反,这里的垫草铺得厚厚的,饲养员并不天天换垫草,只见他有时抱一些垫草来铺在旧垫草上面。可是怪得很,经过一段时期之后,这两组雏鸡的生长发育却不一致, From two phenomena, there are two groups of young chicks, which are managed in two chicken houses. The feed they feed is the same. They are all composed of green fodder, rhizome-like succulent feed, and cereal-based concentrate. In a chicken house, only a thin layer of grass is laid on the ground. Every morning, the keeper removes the grass that contains the chicken manure, and then reapplies a layer of fresh, clean grass. However, the other shed was completely the opposite. The grass was thick and the keeper didn’t change the grass every day. He only saw him sometimes holding some grass to cover the old grass. However, it was very strange that after a period of time, the growth and development of the two groups of chicks were inconsistent.