No. 5, 2007

• 2  Problems and Solutions in Dairy Cattle Raising Zone of China …………………………….Zhou Junling

  4  Milk Residues Caused by Treatment of Endometritis with Antibacterial Drugs and Effect on Yogurt Production………………………………………………………………..Huang Yijun, Jiang Yewen, et al.

  7  Improvement of Blood conservation condition and DNA Extraction method from Blood in Dairy Cattle…………………………….………………………………………...Su Guanghua, Zhang Yuanyue, et al.

  10 Rumen Fermentation and Digestibility of Nutrient Substance Influenced by Different Sources and Levels of Feed Protein in Vitro ………………………………………………………....Lulin, Xu Zengzeng, et al.

  13 Effects of Dietary Supplementation Sel-plex on Lactation Performance and Milk Quality in Dairy Cows…………………………….   ………………………………………….Liu Qiang, Huang Yingxiang, et al.

  16 Associative Effects of Supplementing Ruminant Straw Diets with Alfalfa Hay……................Zhang Jikun

  19  Factors Influencing Anestrus in Postpartum Dairy Cows……………………..Wu Chenchen, Xia Cheng

  23  Analysis of Practical Effect on Sexed Semen of Dairy Cow………….Kan Yuanzheng, Zhang Zhenshan

  24  Influence of Heat Stress on Breeding Performance of Bull and Its Countermeasures…………………………………………………………. ………………Chen Yanhong, Zhang Shuanlin

  28 Factors Influencing Adosculation of Sexed Semen and the Prospect of Its Application…………………………….…………………………….……………..Ma Xuehai, Wang Anjiang, et al.

  32  Current Situation Analysis of Main Pathogenic Bacterium Causing Mastitis of Dairy Cattle in Nanning Region   ……………………………. ……………………………………..Liu Hesheng, He Baoxiang, et al.

  36  Comparison of Three Kinds of Allergy Assessment Standard of Bovine Tuberculosis Detection…………………………….          ……………………………. ………………...Li Jinling, Gao Minghui, et al.

  41 Study on Factors Influencing the Quality of Stirred Yogurt ………………Xia Shiren, Ou Guobing, et al.

  45  Treatment, Utilization and Countermeasures of the Larger-scale Dairy Farm Waste in Farmland…………………………….    ……………………………. …………………….Wang Ying, Jia Yongquan

  48  Problems and Strategy of Planning Dairy Cattle Raising Zone in Cold Region……Xing Xinchun, Ji Baolin, et al.

  53  Application and Thought of Cows' Embryo Transplantation……………………Guo Yongning, Wu Guohui, et al.