The liner is the only part of the milking machine that comes in direct contact with the cow. A cow spends on average 60 hours of every lactation in contact with this liner.
As liners operate over time they lose tension, absorb fat and hold bacteria. This deterioration is sufficient to reduce the speed and completeness of milking, resulting in a loss in milk yield. This also increases teat end damage and increase the spread of mastitis bacteria. To reduce the impact of aged liners on milk yield and udder health, the industry recommendation is to change liners after 2,000 milkings or 6 months, whichever comes first.
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