Lexi Webster
Milk is a staple food in Australia, with Australians drinking almost 9 billion litres of milk every year. Milk is produced using several technologies to make the process more efficient and safer. Cows are milked using vacuum suction cups, and the milk is sent through stainless steel pipes to large refrigerated vats, where it is stored at 4-5°C for no longer than 48 hours. Samples are taken to test for quality, and if approved, the milk is pumped into storage silos where it undergoes pasteurisation and homogenisation. Pasteurisation involves heating milk to 72°C for at least 15 seconds and then immediately cooling it to destroy harmful bacteria and microorganisms, extending shelf life, and making the milk safe for human consumption. Homogenisation involves putting milk under pressure through fine nozzles to evenly disperse fat globules, creating a consistent texture and taste and preventing the cream from separating and rising to the top.
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Milking cows
Dairy is a significant rural industry in Australia, producing about 8.8 billion litres of milk in 2022-23 and employing approximately 33,500 people. However, the dairy industry in Australia is facing challenges, with a decline in herd numbers and an increase in imports.
After milking, cows are provided with a fresh paddock of grass. They may also be fed grain during milking and hay or silage if grass is scarce. Ensuring proper nutrition is essential for milk production and the cow's well-being.
The milk obtained from the cows is stored on the farm in refrigerated vats or silos at 4 degrees Celsius or lower for no more than 48 hours. It is crucial to maintain a consistent temperature and prevent milkfat separation. Milk tanker drivers, who are accredited milk graders, collect the milk within 24 to 48 hours. They evaluate the milk based on temperature, sight, and smell before transporting it to the processing factory in insulated tankers.
At the factory, samples are taken from the bulk milk tanker and tested for antibiotics and temperature. If the milk meets the required standards, it undergoes further processing, including pasteurisation and homogenisation, to ensure safety, consistency, and a longer shelf life.
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Milk transportation
Milk is collected from farms every 24 to 48 hours. The milk is stored on the farm in refrigerated vats or silos at 4 degrees Celsius or less. The vats and silos are agitated to ensure the milk remains cold and that milkfat does not separate from the milk. After collection, milk is transported to factory sites in tankers with a stainless steel body that is heavily insulated to maintain the milk's temperature.
Milk tanker drivers are accredited milk graders, allowing them to evaluate and grade the milk before collection. They can reject milk based on temperature, sight, and smell. A representative sample is collected from each farm pickup before being pumped into the tanker.
At the factory, samples are taken from the bulk milk tanker to test for antibiotics and temperature before the milk enters the factory processing area. The milk is then stored in refrigerated silos before further processing.
Transporters of raw milk products are required to be accredited with Dairysafe and must comply with Standard 4.2.4 of the Food Standards Code. Transport operators should ensure their drivers understand the importance of hygiene and temperature control and ensure that no non-milk products contaminate the tankers. SRH Milk Haulage is an example of a milk transport business in Australia, operating since 1996.
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Pasteurisation
After milk is collected from dairy farms, it is transported to factory sites in insulated tankers to keep it cold during transportation. Samples of milk are taken from farm vats and tested for various factors, including antibiotic content, temperature, milk fat, protein, and bacteria count. If the milk meets the required standards, it is pumped into storage silos for pasteurisation and further processing.
The pasteurisation process is carefully controlled to ensure that every particle of milk reaches the specified temperature for the required duration. This process is essential to kill any harmful bacteria and microorganisms that may be present in the milk, making it safe for consumption. After pasteurisation, the milk is cooled again without allowing recontamination.
In addition to pasteurisation, milk in Australia undergoes homogenisation. This process involves forcing milk through fine nozzles under pressure, which breaks up fat globules and creates a more consistent texture. Homogenisation prevents the cream from separating and rising to the top, ensuring that the milk has a uniform taste and appearance.
The milk production industry in Australia faces various challenges, including declining herd numbers, rising farmland prices, and increasing imports. Despite these challenges, milk and dairy products are an important part of Australia's rural industry, with the country exporting a significant proportion of its milk production.
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Homogenisation
Milk homogenisation is a process that ensures milk has a consistent texture and taste. It involves putting milk under pressure and forcing it through fine nozzles, which disperses fat globules evenly throughout the milk. This stops the cream from separating and rising to the top, and ensures that milkfat is distributed uniformly. The process also extends the shelf life of milk.
The process of homogenisation also helps milk producers conform to the Food Standards Australia New Zealand Food Standards Code, which governs the composition of milk. This code allows manufacturers to add or withdraw milk components to standardise milk composition and produce consistent and safe products. For example, under the code, packaged full-fat milk must contain at least 3.2% fat and 3.0% protein.
In addition to homogenisation, milk also undergoes pasteurisation to destroy harmful bacteria and microorganisms and to further extend its shelf life. This involves heating milk to 72°C for at least 15 seconds and then cooling it immediately. Together, homogenisation and pasteurisation techniques ensure that milk is safe, consistent, and shelf-stable.
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Milk bottling
Firstly, milk is collected from dairy farms and transported to factory sites in insulated tankers to keep it cold during transportation. Samples are taken from farm vats and the bulk milk tanker to test for factors such as antibiotic content, temperature, milkfat, protein, bulk milk cell count, and bacteria count. If the milk meets the required standards, it is pumped into storage silos for further processing.
The next step in the bottling process is pasteurisation, which involves heating the milk to 72°C for at least 15 seconds and then cooling it immediately. This process kills any harmful bacteria and microorganisms, extending the shelf life of the milk and making it safe for consumption. Pasteurisation is a crucial step to ensure the milk is safe for human consumption.
Following pasteurisation, the milk undergoes homogenisation, where it is put under pressure through fine nozzles to evenly disperse fat globules. This process prevents the cream from separating and rising to the top, creating a consistent texture and taste. Some manufacturers may choose to produce unhomogenised milk, where the cream is allowed to rise to the top, for consumers who prefer this option.
Finally, the milk is bottled and packaged, ready for distribution and sale. The bottling process must be carefully controlled to maintain the quality and safety of the milk, ensuring it meets the relevant standards and regulations. The bottles used for packaging can be made of plastic or glass, depending on the manufacturer's preferences and target market.
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Frequently asked questions
Cows are milked using vacuum or suction cups attached to their teats. The milk is then sent through stainless steel pipes to large refrigerated vats or silos, where it is stored at 4-5°C or less for no longer than 48 hours.
Milk is collected from farms every 24 or 48 hours using tankers with a special stainless steel body that is heavily insulated to keep the milk cold during transportation to the processing factory.
At the factory, the milk is pasteurised and homogenised. Pasteurisation involves heating the milk to 72°C for at least 15 seconds and then immediately cooling it to destroy harmful bacteria and microorganisms and extend shelf life. Homogenisation involves putting milk under pressure through fine nozzles to evenly disperse fat globules and prevent the cream from separating and rising to the top.
Cows are typically milked two or three times per day, usually around 6 am and 5 pm. Milking time takes about 5 minutes per cow and depends on the type of machine and the cow's milk production.
