The aim of the study was to examine the effects of two different "step two" lying areas on daily gain and piglet losse......

利用西峰市何堵牛场地和育肥早胜牛，随机选择分牛２９头，阉牛２２头进行对比试验６０天。结果表明，公，阉牛平均均重分别为６０．５ｋｇ和４６．０ｋｇ，日增重分别为１．００８ｋｇ和０．７６７ｋｇ，差异极显......

选用1200羽喇出壳的樱桃谷肉鸭，依性别随机分为2组，每组设4个重复(每个重复150羽鸭，公母各半)，一组为对照组，饲哏基础日粮，另一组为试验......