Dairy Cow Welfare: Teat Health
Teat health is central to both udder health and dairy cow welfare. The teat canal is the primary physical barrier against mastitis-causing pathogens, and teat condition reflects milking management quality, machine function, and cow health status.
Teat-End Hyperkeratosis
Repeated cycles of milking cause callous ring formation at the teat orifice — teat-end hyperkeratosis. Mild roughening is normal, but severe hyperkeratosis (rough, proliferative rings) compromises the teat canal's protective function, increasing mastitis risk and potentially causing discomfort during milking.
Scoring systems (N, S, R, VR — normal to very rough) allow monitoring across the herd. High prevalence of rough teat ends indicates milking machine problems, over-milking, or high-yielding cows with inadequate recovery between milkings. Automatic cluster removal (ACR) settings, pulsation ratios, and vacuum levels all affect teat-end condition.
Milking Machine Effects on Welfare
Poorly functioning milking equipment causes pain, teat damage, and increased mastitis. Overmilking — continuing vacuum exposure after milk flow has ceased — causes congestion, oedema, and tissue damage. ACR systems with appropriately set thresholds prevent overmilking and improve teat health.
Pulsation failures, vacuum fluctuations, and liner slippage cause impacts that stress the teat and create routes for pathogen entry. Regular milking machine testing (minimum annually; ideally twice yearly) detects these problems before welfare impact accumulates.
Post-Milking Teat Disinfection
Post-milking teat dipping or spraying with appropriate disinfectant (iodophor, chlorhexidine, lactic acid preparations) is one of the most evidence-based mastitis prevention practices. Disinfectants must include emollient components to prevent teat skin cracking and soreness, particularly in cold and wet conditions.
Pre-milking teat preparation (cleaning, stimulation, and fore-stripping) not only improves milk letdown but allows early identification of clinical mastitis — hard quarters, clots, or pain — enabling prompt treatment and welfare intervention.
Teat Injury and Trauma
Teat injuries from machinery, gating, other cows, or self-trauma (inter-digital dermatitis involving the foot can alter gait and increase teat exposure risk) cause significant pain and predispose to mastitis. Prompt veterinary attention to teat injuries — suturing lacerations, managing orifice damage — reduces welfare impact and production loss.
Internal teat cisternal lesions (spider, Furstenberg rosette abnormalities) and teat canal obstructions cause discomfort and require careful management or culling decisions.
Robotic Milking Teat Health
Automatic milking systems present specific teat health challenges. Teat-end condition varies differently compared to conventional milking — more frequent milking with shorter intervals but different vacuum and pulsation profiles. Farms transitioning to AMS should monitor teat-end scores closely and adjust system settings accordingly. Dirty teats increase liner contamination and mastitis risk in robotically milked herds.