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PubMed1988

Estimation of the costs of mastitis, using National Animal Health Monitoring System and milk somatic cell count data.

Data collected by the National Animal Health Monitoring System in Ohio for a 12-month period during 1986 and 1987 were used to determine the relative magnitude of costs associated with mastitis in the following categories: milk production loss, veterinary services, drugs, producer labor, and "other" factors. The cost of milk loss associated with mastitis that was reported by producers cooperating in the National Animal Health Monitoring System program was compared with estimates based on bulk tank somatic cell counts and individual cow milk somatic cell counts. Using producer-reported estimates, milk loss accounted for about one third of the total cost associated with mastitis. When estimates of milk loss were replaced by estimates based on bulk tank somatic cell counts, milk loss accounted for over 80% of the total cost of mastitis. Estimates of the cost of milk loss based on studies relating milk yield to somatic cell counts differed considerably. Consequently, it was unclear how to best estimate the relative magnitude of the milk loss component of mastitis costs.

Animals↗
PubMed1985

Influence of liver fat on experimental Escherichia coli mastitis in periparturient cows.

Eleven cows with a wide range of liver fat (5.7 to 51.4 per cent) at seven days post partum were experimentally infected in a single quarter with a capsular Escherichia coli at 10 days post partum. The results suggested that a fatty liver in itself does not influence the severity of mastitis. All animals had clinical mastitis 10 hours after infection but no animals became severely ill and no treatment was given. Four out of five animals in the group with less than 20.2 per cent liver fat had bacteria in their milk at 10 hours after infection but these bacteria were eliminated by 12 hours. The six animals in the group with more than 28.3 per cent fat in their liver retained viable bacteria in the udder for much longer; with two animals bacteria were shed and abnormal milk was secreted for up to four months despite antibiotic therapy.

Animals↗