Udder health by design: building a herd that resists mastitis

Udder health is the clearest example in dairy of a problem that is solved by management systems rather than by intervention. The Neave et al. (1969) control programme — post-milking teat disinfection, dry-cow management, prompt attention to clinical cases, culling of chronic cows and regular machine maintenance — reduced contagious mastitis across the UK national herd within a decade, and every modern udder-health programme is a refinement of it.

Start with the milking routine, not the parlour

Across the herds Bouvera works with, the biggest single explanation of bulk-tank somatic cell count is not equipment but routine consistency: how teats are prepared, how long stimulation lasts before attachment, and whether the same sequence happens on every shift. Dufour et al. (2011) quantified this across large herd datasets — herds with documented, audited milking routines carry materially lower SCC than herds with equivalent facilities and no routine discipline.

• Fore-strip and pre-dip every cow, with 20–30 seconds of contact time before wiping.
• One clean cloth or towel per cow — this single change is repeatedly the cheapest SCC gain available.
• Attach 60–120 seconds after first tactile stimulation to align with oxytocin release.
• Post-dip full teat coverage on every quarter, every milking, checked by observation and not assumption.

The environment sets the ceiling

Once contagious transmission is controlled, environmental exposure decides how far a herd can go. Bedding dry-matter, stall cleaning frequency, alley scraping intervals and pre-milking cow cleanliness scores are the working variables. Ruegg's (2017) century review makes the point plainly: in modern herds the dominant pathogens are environmental, and environmental pathogens are managed through hygiene and housing, not through the milking cluster.

The dry period is a prevention window

Most new intramammary infections in a lactation are seeded around dry-off and around calving. Selective dry-cow approaches — deciding at the cow level, on records, which animals need which management at dry-off — have been shown by Rowe et al. (2020) to maintain udder health outcomes while reducing blanket antimicrobial use, provided that hygiene at dry-off and a clean, dry dry-cow environment are in place first. The selection framework and any product decision are made with the herd veterinarian; the farm's job is the data quality and the hygiene that make selection safe.

What to monitor

• Bulk-tank SCC trend on a rolling three-month basis, not month to month.
• Proportion of the herd above 200,000 cells/mL at each test day.
• New infection rate over the dry period, calculated from last-test and first-test pairs.
• Clinical case rate per 100 cow-months, recorded consistently by whoever finds the case.

A herd that measures these four figures every month, and reviews them with its veterinarian quarterly, will out-perform a herd with better facilities and no measurement. That is the practical conclusion of fifty years of udder-health science.