part ii is about the present status and problems of the milch cow industry.
第二部分是中国奶牛业发展现状及存在的问题。
in part iii, the author analyzes why the extensive development exists in the chinese milch cow industry.
第三部分是中国奶牛业粗放式发展的原因分析。
milch cow industry is one of important part of dairy industry, including breeding milch cow , raising milch cow , preventing and cure of the epidemic disease and milk production.