Effects of Different Non-genetic Factors on Ketosis in Dairy Cows
[Objective]Ketosis is a common metabolic disease in high yielding dairy cows,at present,it is usually diagnosed initially by measuring the blood ketone level,but the collection of blood samples will cause stress to the cows and increase the workload of veterinarians.In this study,the measurement records of dairy herd improvement(DHI)were used to reduce the stress of sample collection on the cows,reduce the workload of veterinarians,and to analyze the effects of different factors on ketosis in cows,so as to provide reference for the prevention and treatment of ketosis in farms.[Methods]The daily production performance records of DHI measurement were collected from 2021 to 2022 in four dairy farms,and the milk production performance records of cows with ketosis were analyzed by SPSS 19.0 software,followed by analysis on the effects of different non-genetic factors on ketosis in dairy cows using SAS 9.2 software.[Results]For the milk production indicators,the average milk fat rate and urea nitrogen of cows with ketosis were higher than those of healthy cows.Among the non-genetic factors,the farm,year,season and litter size had extremely significant effects on ketosis in cows,with the highest incidence of ketosis in spring,followed by fall,lower incidence in summer and winter,and the number of infected cows with two births was the largest.[Conclusion]Ketosis in dairy cows was affected by many factors,so farms should formulate feeding management plans according to the season,litter size and other factors,at the same time,predict whether cows were suffering from ketosis on the basis of sorting out the changes in milk fat rate,urea nitrogen and other indicators in the DHI records.Once the ketosis was found,timely treatment should be given to minimize the damage to the cow,so as to reduce the economic losses of the farms.
ketosisDHIinfluencing factormilk production performance
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