奶牛跛行的环境因素及改进措施（Environmental factors for lameness of cows and improvement measures）.doc

奶牛跛行的环境因素及改进措施（Environmental factors for lameness of cows and improvement measures） A lot of studies on the prevalence of claudication in cows show that the incidence of claudication in cows is high, about 0-55%. The range may be affected by many factors of comprehensive, including cow varieties, genetic selection, cattle constitute characteristics, nutrition and feeding management, milk production, waste cleanup process, whether there is a certain infectious diseases and environmental factors related to dairy production. In the survey of 17 dairy cows in North America, the incidence of claudication in cows was 13.7% in summer and 16.7% in spring. The cows, on average, were 50 cows, 14 of which were kept in flail or tethered. 30 (1) in the Wisconsin dairy herd (tied type and column type feeding each half of the survey, using four point movement score cows limping rate (LS) system evaluation, each cow group all the cows in the winter and summer for a score. The scoring system is shown in table 1. In accordance with the LS method, we identified LS3 and LS4 cows as clinical claudication. LS2 dairy cows are not included, but these cows are in a stage of disease progression or recovery, with a slightly abnormal gait. About 22 per cent of cows in the herd were in clinical claudication, and table 2 made a statistical analysis of the exercise scores between the cows. It can be seen that the incidence of claudication in the 100 percent of the cattle is less than 15 percent in both summer and winter, which is also our goal to control the incidence of claudication. Whats interesting is that these cows dont have a single LS4. Therefore, it is a good warning to find that a couple of cows with severe claudication have become a problem for the cattle. The average incidence of claudication in both summer and winter cows was 19.6%, which was slightly higher than previous reports. The incidence of claudication in the HSCS remains high, 22.8% in the summer and 27.8% in winter, provin