Analysis On The Occurrence Of Ketosis In Scale Dairy Cattle Farms In Shanxi

Ketosis is a common nutritional and metabolic disease in dairy cows,especially in high-yielding dairy cows.With the rapid development of dairy industry,the incidence of ketosis in dairy cattle is also increasing.Ketosis affects the performance and reproductive performance of dairy cows and causes other diseases.Therefore,it is necessary to understand the occurrence of ketosis in large-scale dairy farms in Shanxi Province,so as to provide a scientific basis for the prevention of ketosis in the future.According to the content of acetone and beta-hydroxybutyric acid detected by DHI,the risk of ketosis in dairy cow population can be effectively reflected.The DHI data from March 2017 to February 2018 were analyzed to study the effects of different regions,seasons,parity and lactation period on the occurrence of ketosis in dairy cows and the effects of ketosis on the performance of dairy cows.T he purpose of this study was to provide a reference for exploring the occurrence regularity of ketosis in dairy cows and reduce the economic losses caused by ketosis as much as possible.The results showed:(1)The incidence of subclinical ketosis and clinical ketosis of dairy cows in Jinbei was the highest,19.1% and 8.1% respectively,followed by Jinzhong,17.0% and 4.0% respectively,and the lowest in Jinnan,7.8% and 1.6% respectively,and the incidence of subclinical ketosis in different areas was higher than that of clinical ketosis.For subclinical ketosis,Jinnan and Jinzhong and Jinbei had significant effects(P < 0.05),but there was no significant effect between Jinzhong and Jinbei(P > 0.05);for clinical ketosis,there was no significant effect between Jinnan and Jinzhong(P > 0.05),but both had significant effects with Jinbei(P < 0.05).(2)The incidence of subclinical ketosis and clinical ketosis was the highest in spring,26.22% and 23.0% respectively,followed by winter and summer,and the lowest in autumn,12.3% and 9.26% respectively.The incidence of subclinical ketosis in different seasons was higher than that of clinical ketosis.No matter subclinical ketosis or clinical ketosis,there was significant difference between spring and other seasons(P < 0.05),but no significant difference between summer,autumn and winter(P > 0.05).(3)The incidence of subclinical ketosis and clinical ketosis in first-born cows was lower,1.45% and 1.1% respectively.The incidence increased with the increase of parity.The incidence of 4-fetal cows was 35.12%,which was significantly different from other parities(P < 0.05).The incidence of subclinical ketosis in different parities was higher than that of clinical ketosis.The incidence of ketosis at 1-3 weeks postpartum and 4-6 weeks postpartum was significantly higher than that at 7-10 weeks postpartum.(4)The incidence of subclinical ketosis and clinical ketosis in dairy cows at 4-6 weeks postpartum was the highest,26.20% and 14.73% respectively,followed by 1-3 weeks postpartum.The incidence of subclinical ketosis and clinical ketosis in dairy cows at 7-10 weeks postpartum was lower,13.84% and 3.21% respectively.There were significant differences between 7-10 weeks postpartum and the first two lactation stages(P < 0.05).(5)The average daily milk yield of healthy dairy cows and clinical ketosis dairy cows was very significantly different(P < 0.01).The average daily milk yield of healthy dairy cows,clinical ketosis dairy cows and subclinical ketosis dairy cows was significantly different(P < 0.05);there was no significant difference in milk fat rate among the three groups(P > 0.05);the milk protein rate among the three groups was significantly different(P < 0.05).Conclusion:The incidence of ketosis in dairy cows was significantly affected by region,season,parity and lactation stage.The ketosis of dairy cows has a significant effect on the performance of cattle,especially on milk yield and milk protein rate.