The Importance of Milking Liners: Performance, Hygiene, and Cow Comfort

At Pearson Milking Technology, we understand that delivering peak milking performance starts with the smallest yet most critical component of your parlour – the milking liner.

Liners are the only part of the milking machine that comes into direct contact with the cow. As such, they play a central role in mastitis control, milking efficiency, and cow comfort. That’s why proper maintenance and timely replacement of liners is essential for every dairy operation.

When Should Liners Be Changed?

Pearson liners are engineered for performance and longevity, but like all rubber components, they must be replaced after 2,300 milkings or every six months – whichever comes first. Sticking to this schedule ensures consistent milking, reduces the risk of infection, and prevents avoidable teat damage.

Installing Liners Correctly

When installing new liners, it’s crucial they are fitted correctly and securely. Poor installation can cause liner slip, pinched teats, and incomplete milking – all of which stress the cow and reduce yield.

While replacing liners, it’s a good time to check for other signs of wear in your milking system. Pulsation and milk tubes should be inspected for cracks, frays, or blockages – all of which can impact vacuum levels and milk flow.

How to Calculate Liner Change Frequency

To work out how often your liners need changing, you’ll need to know:

• Number of cows milked
• Number of milking units
• Number of milkings per day

Use this simple formula:

Example:
If you’re milking 140 cows in a 16-unit parlour, twice a day:

(140 × 2) ÷ 16 = 17.5 milkings per unit per day
2,300 ÷ 17.5 = ~131 days

In this case, liners should be changed every 130 days, or roughly twice a year in a spring-calving herd.

Why Changing Liners Matters

Worn liners can negatively impact the entire milking routine:

• Reduced elasticity leads to slower milking and teat-end damage.
• Early liner collapse reduces milk-out efficiency and cow comfort.
• Cracks and roughness inside old liners harbour bacteria – increasing the risk of mastitis and thermoduric bacteria, which can compromise milk quality.

Thermoduric bacteria survive pasteurisation and are often found in perished rubber components. Regularly changing liners is a simple but effective step in keeping your milk quality high and cell counts low.

Pearson Milking Liners – Designed for Performance

All Pearson liners are designed and tested to perform seamlessly with our parlour systems, delivering gentle, fast, and complete milking every time. Our specialists are available to help you set a liner replacement schedule tailored to your herd size and milking frequency.

For more information on choosing the right liner for your system or setting up a maintenance plan, get in touch with our team today.