The Analysis Of Diagnositic Mechanism And The Development Of Diagnostic Methods For Cow Subclinical Mastitis

The diagnositic mechanisms of cow subclinical mastitis were studied by analyzing the relationship between somatic cell count (SCC) and four factors (milk component, season, lactation, 305-day production) and between the pH value and the concentrations of Cl~- in milk and blood. On the basis of these mechanisms, two new diagnostic methods for cow subclinical mastitis including the pH diagnostic method and the cholridion diagnostic method were developed compared with the electronical somatic cell count method and CMT method. The effect of these two diagnostic methods for the subclinical mastitis on various conditions (temperatures, seasons, lactations, regions and forages) was tested.1. The relationship between the SCC and milk components, season, 305-day productionThe relationship between the SCC and milk components, season, lactation, 305-day production was analyzed among 17076 milk samples. The results: With the increase of SCC, the percents of fat, protein , lactose and the freezing point in milk were reduced. The maximum contents of the total solids and solid-not-fat occurred in 0.5-1 million SCC, then the contents of total solids decreased as the increase of the number of SCC. Interestingly, the SCC in the summer and autumn was significantly higher than that in winter and spring.2. Relationship between chloridion concentration, pH in blood and milk and cows subclinical mastitisThe cholridion concentration and the pH in the milk and blood were tested. The results were as follows: the chloridion concentration and pH in blood and milk of subclinical mastits cows were significantly higher than those in healthy cows (p<0.05). The higher chloridion concentration was, the more serious mastitis the cows had. The chloridion concentration in milk of healthy cows was significantly higher than that in milk of subclinical cows and there was significantly difference among the milks of healthy cows,...