Abstract

The control of new intra-mammary infections in dairy herds requires a herd diagnosis using available data, particularly clinical mastitis cases and individual cow somatic cell counts, backed up with bacteriology. For herds with predominantly environmental infection patterns of mainly lactating period origin, key items for prevention and control include ventilation, provision of additional space, bedding management for lactating cows, management of pasture for risk periods when grazing and pre-milking teat disinfection. The impact of several changes to management can be tracked using the lactation new infection rate and lactation origin rate, based on cell count and clinical cases respectively.

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