Wednesday, 14 October 2020 13:31

Cool milk quickly

Written by  Staff Reporters
The quicker the milk is cooled after milking, the better the quality when it is collected from the farm. The quicker the milk is cooled after milking, the better the quality when it is collected from the farm.

Milk cooling affects milk quality. The quicker the milk is cooled after milking, the better the quality when it is collected from the farm.

Choosing the right cooling system for your farm means:

Lower energy costs

Milk cooling accounts for about 30% of the total energy costs of operating a dairy: energy demand and farm diary operating costs can be reduced using different options that involve heat recovery from your cooling system.

Less risk of penalties due to milk temperature

Raw milk grows bacteria rapidly above 7°C. Meeting the new milk cooling standards, which came into effect for all farms two years ago has meant changes on many farms.

The Ministry for Primary Industries New Zealand Code of Practice for the design and operation of Farm Dairies has new milk cooling standards.

The rules apply to:

Converted farms immediately

All farms from 1 June 2018

The rules state that raw milk must:

a) be cooled to 10°C or below within four hours of the commencement of milking; and

b) be cooled to 6°C or below within the sooner of:

i) six hours from the commencement of milking, or

ii) two hours from the completion of milking; and

c) be held at or below 6°C without freezing until collection or the next milking; and

d) must not exceed 10°C during subsequent milkings.

In situations where there is continuous or extended milking, such as automated milking systems, the milk must enter the bulk milk tank at 6°C or below. 

“Continuous or extended milking” is defined as milking for six hours or longer from the time that milk first enters any bulk milk tank.

Farmers are still being urged to check the performance of their current milk cooling systems, including plate heat exchanger. 

Other options

If your current plate heat exchanger and refrigeration unit combination are not capable of meeting the new milk cooling regulations you may need to consider a secondary cooling option. 

These can involve a large capital outlay and long payback period but may come with the benefit of heat recovery, enabling you to save on hot water costs. Other options include:

• Cooling towers

• Ice banks

• Snap chillers

• Thermal stores

• Vat wraps

More like this

Clean shed, clean milk

Machine cleaning systems maintain milk quality by aiming to remove all milk residues from the plant and destroying any resident bacteria.

Featured

Back the sector that backs NZ

OPINION: The biggest issue currently facing our industry is environmental policy, writes Beef+Lamb NZ chief executive Sam McIvor.

 

Meat quota rates remain vital

A jump in the value and volume of New Zealand’s sheepmeat exports to Europe and the UK shows why preserving WTO tariff-rate quotas is so important, claims the Meat Industry Association (MIA).

Lamb price down, but not weak

While lamb prices are starting the new season at around 16% below last year’s levels, they are not outright weak, according to the BNZ.

National

Machinery & Products

Let aura feed the mob

In a move that appears to have been repeated by many equipment manufacturers, Kuhn confirms it currently working on several…

Battery charger range recharged

Projecta's popular ‘Charge N’ Maintain’ automatic battery charger range has now been recharged – with the introduction of new features…

» The RNG Weather Report

» Latest Print Issues Online

Milking It

Eyes have it

OPINION: Painting eyes on the backsides of cows could save their lives, according to new research by Australian scientists.

Walkers versus cows

OPINION: A North Yorkshire teacher has become at least the second member of the public to be trampled to death…

» Connect with Dairy News

» eNewsletter

Subscribe to our weekly newsletter