Mayishan cow farm was selected as the experimental unit,and 220 Holstein cows were randomly sampled in order to make assessment and analysis on udder linear traits of Holstein cows,which including fore udder attachment,rear udder height,rear udder width,udder cleft,udder depth,and teat length.

Isolation and Identification of Pathogenic Bacterium Causing Subclinical Mastitis of Dairy Cattle;

Epidemiologic Survey and Isolation and Identification of Pathogenic Bacteria of Bovine Subclinical Mastitis;

Relationship between changes of milk pH-value and numbers of embryonic cells in the cows suffered from subclinical mastitis;

Inhibition to pathogens of cow recessive mastitis by Chinese herb compound prescription in vitro;

Isolation and identification of the pathogenic bacteria of cow recessive mastitis and it s drug sensitivity test;

The results showed as follows:in Huainan area,the positive rate of udder region and the positive rate of cow on recessive mastitis were 25.

Genetic differences of mastitis resistance between breeds and within breed in dairy cows are significant, so genetic selection to improve mastitis resistance may be the best long-term stratege bacause it offers the possibility for permanent resolution of this complex disease problem.