求翻译：摘要 实验研究了中草药添加剂对鸡产蛋后期生产性能及蛋品质的影响。 选取450日龄健康、体重基本一致的海兰褐蛋鸡225只。将选取的海兰褐蛋鸡随机分为5组，每组45只，每组设3个重复，每个重复15只，分别为对照组，Ⅰ组、Ⅱ组、Ⅲ组、Ⅳ组，采用相同的饲养管理方法，饲喂相同的基础日粮，自由饮水，自由采食。试验期为30天。是什么意思？

Studied experimentally the impact of Chinese Herbal Medicine on the late production of chicken egg-laying performance and egg quality. Select the health of the 450 days of age, with basically the same body weight Hyland brown laying hens 225. The selected Hy-brown laying hens were randomly divided i

Experimental research Summary The herbal additives in the chicken eggs and post-production performance of egg quality. Select from 450 healthy aging, and weight as the sea, only 225 brown egg chicken. The selection of the brown-egg chicken randomly divided into 5 groups and have each group 45, only

The abstract experimental study Chinese medicine chemical additive has produced the egg to the chicken later period to produce the performance and the egg product archery target influence. Selects on 450th the age health, body weight basic consistent Hiran brown layer 225.Will select the

Summary of experimental study on Chinese herbal medicine additive on egg production performance and egg quality of late. Select 450 age health, basically the same weight of 225 in sea blue Brown layers. Sea Blue Brown laying hens is picked randomly divided into 5 groups, each group of 45, 3 Repeat f