Information about 5 body shape traits and 9 ecologocal factors of habitation for 10 groups of Chinese yaks have been processed and analyzed by the method of principal component analysis and clustering analysis to determine the relation between yak body size and ecological factors.

Genetic resources of China yak,its utilization and existing problems are discussed.

The chatacteristics of karytype,G-band,C-band,Ag-NORs-band and synaptonemalcomplex(SC)of China yaks are systematically studied and analysed.

For the eye muscle of Gayal,Zebu,Zhongdian yak,Diqing yellow cattle and Zhongdian cattle yak,the muscle fiber diameter are 57 48±1 15,109 45±1 84,100 38±6 25,90 38±5 31,and 97 35±9 62 μm respectively;the musc les fiber density are 201 54±2 66,115 45±4 04,106±10 10,90 38±5 31 and 97 35±9 6 number/mm 2;respectively the fiber number in per fasciulus are 73 23±8 90,34 32±8 77,36 22.

The muscle′s mineral contents of Zhongdian yak, Gayal,Zebu,Diqing yellow cattle and Zhongdian cattle yak have been measured.

13),Zhongdian yak(73047.

Isolation of EST for CAPN1 of Bos grunniens with nested and touch-down PCR;

Cloning,Sequencing Research on Partial Fragment of Obese Gene of Bos grunniens;

Cloning and Sequencing of Partial Fragment of TNF-α Gene of Bos grunniens;

Research on Manufacture Technology of Urum with Yak;

Isolation and Identification of Lactobacillus in Yak Yoghourt in Part pasture of Qinghai Provincl;

Analysis of fatty acid composition of homemade yak yogurt;

Studies on Behavior Observation and its Application of Yaks;

Studies on Histological Characteristics of Follicle and Corpus Luteum in Yaks during Pregnancy;

The Studies on Histological Characteristics of Follicular Systems and Corpus Luteum in Yaks During the Estrous Cycle;