The Investigation Of Subclinical Mastitis In Epidemiology And The Study Of Different Treatment Methods In Yu-Lin

In order to reduce the mastitis to cow's industry harm and enhance the cow's milk yield and the quality, LMT (the Lanzhou mastitis method) was used to investigate 270 Lactating cows in Yu-yang District. We divided 120 cows in subclinical mastitis into three different groups (A, B, C) randomly. A group used the Chinese medicine to carry on the 50 cows, B group used the antibiotic to carry on the 50 cows, C group was a control group and no measure was carried on20 cows. The results as follows:Test 1①Subclinical mastitis was 54.81% and positive rate of breast areas was 25.22% in Yu-yang District;②In the first three births cows had lower incidence and the average incidence rate was 37.89%, after the fourth births cows had higher incidence and the average incidence rate was 64.22%, the difference was greatly significant(P<0.01);③In the first and fourth quarter, the cows had lower incidence rate (50.75%), while in the second and third quarters, the cows had higher incidence rate (68.39%), the difference was greatly significant(P<0.01);④In the 2 ~ 4 years old, the average incidence rate was 41.25%, while in the 5 to 8 years old, the average incidence rate was 73.64%, the difference was greatly significant (P<0.01);⑤In the first two nipple, the cows had lower incidence rate (48.15%), while behind the first two nipple, the cows had higher incidence rate, but the difference was not significant (P<0.05);⑥The cows had higher rate of incidence in January, May, June, which was 70%, 71.43 % and 62.5% respectively, but the difference was not significant (P<0.05), the cows had the lowest rate of incidence in March, the incidence rate decreased gradually from August;⑦When the milk yield was in the below 10kg, 10kg ~ 15kg, 15kg ~ 20kg respectively, the positive rate was 70.15%, 54.41%, 38.24% respectively. When the milk yield was more than 20kg, the positive rate incidence was 22.39%, which was significantly different (P<0.05). Subclinical mastitis was 45%～65% in Yu-lin District and positive rate of breast areas was 18%～30%. Test 2①A group used the Chinese medicine cured 40 cows and the cure rate was up to 80%, the first effective number is 47, the efficiency was up to 94%, the difference was greatly significant (P<0.01); B group used antibiotic drugs cured 17 cows after 15d and the cure rate was 34%, the first effective number is 22, the efficiency was 44%, the difference was significant (P<0.05); C group used no drugs was two self-healing and a turn for the better;②T he average milk yield in A group was 18.5kg before treatment, but after 15d treatment, the milk yield increased to 27.5kg, a net increase of 9kg, the difference was greatly significant (P<0.01); the average milk yield in B group before treatment was 19.5 kg, but after 15d treatment, the milk yield was 22.5kg, a net increase of 3kg, the difference was significant (P<0.05); Because C group did not use any treatment, the disease increased and the milk yield decreased, from 18.5kg to14.5kg, a net decrease of 4kg. So using the Chinese medicine to cure subclinical mastitis was the better treatment at present.