Wednesday, 15 May 2024 09:55

OAD milking affects protein content

Written by  Staff Reporters
According to a study from the Riddet Institute, OAD milking can increase or lower the amounts of proteins in milk. According to a study from the Riddet Institute, OAD milking can increase or lower the amounts of proteins in milk.

Once-a-day milking (OAD) can increase or lower the amounts of proteins in milk, according to a new study published in the journal Dairy.

The study was conducted by Riddet Institute PhD student Marit van der Zeijden as part of her PhD looking at the comparison between OAD milking and twice-a-day (TAD) milking.

The study found significant differences in the proportion of some proteins, depending on the milking system used.

"Milk from a OAD milking system contained higher proportions of as2 casein and k-casein and lower proportions of a-lactal-bumin," says van der Zeijden.

She says this could have implications for milk processing and quality, as gelation and heating properties are impacted by these proteins.

Van der Zeijden says this was the first study to look at protein composition across the whole milking season, rather than a single sample. Most similar studies also examined outputs of cows temporarily switched to once-a-day rather than cows best suited to the regime.

Bovine milk from cows at two Massey University research farms in Palmerston North were compared in the study, one on OAD milking and one TAD. Both farms were pasture-based feeding systems, with higher dry matter supplementation on the TAD farm.

The cows were also as homogenous as possible, with nine cows from each system selected comprising the same make up of Holstein-Friesian (3), Holstein-Friesian x Jersey cross (3), and Jersey (3). Van der Zeijden took full-milkings samples at nine pivotal stages of the milking season - three at the beginning of the season, three in the middle, and three towards the end. Samples were also categorised by the day in the lactation stage the cow was in on the day of sampling (early, mid, and late). The TAD cows had milk from the two milkings combined.

She says many factors can affect protein composition, including the time in the season and the lactation stage of the cow, from calving to drying off time when protein and fat increase as milk yields decrease.

More like this

Understanding udder health

Last month we talked about why dry cow management is critical, though often overlooked. This month I wanted to dive further into the dry period’s importance to udder health.

Farmer input needed to combat FE

Beef + Lamb New Zealand (B+LNZ) is calling on livestock farmers to take part in a survey measuring the financial impact of facial eczema (FE).

The future of beef breeding

Progeny testing at Pāmu’s Kepler farm in Southland as part of Beef + Lamb New Zealand’s Informing New Zealand Beef programme is showing that the benefits of hybrid vigour could have a massive impact on the future of beef breeding.

Featured

Court decision a win for Southland farmers

Federated Farmers says it welcomes a recent court decision which granted a stay on rules in the Southland Water and Land Plan until legislative changes can be made by government.

National

Machinery & Products

Gong for NH dealers

New Holland dealers from around Australia and New Zealand came together last month for the Dealer of the Year Awards,…

A true Kiwi ingenuity

The King Cobra raingun continues to have a huge following in the New Zealand market and is also exported to…

Data crucial to managing water

Watermetrics was formed as a water data collector and currently supplies and services modern technology such as flow meters, soil…

» Latest Print Issues Online

Milking It

King Island rescue

OPINION: Two Australian cheesemakers have rescued the iconic Tasmanian cheese company King Island Dairy.

Baileys vegan flavour

OPINION: World famous liqueur maker Baileys is the latest to dabble with plant-based products.

» Connect with Dairy News

» eNewsletter

Subscribe to our weekly newsletter