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

Innovation, probiotic deliver results

In 2018, faced with a Salmonella outbreak among his calves and the effects of the subsequent vaccination, Waikato dairy farmer Cole Townsend turned to social media for a solution.

The quest for quality

Pat and Shelley Schnuriger’s resolve to reduce their Holstein Friesian herd to 100 cows has proven its worth, with an exceptional percow production backing up their decision.

Science helping prevent mastitis, reduce emissions

Building on their groundbreaking work in mastitis prevention, FIL, a subsidiary of GEA Farm Technologies New Zealand, is collaborating with Farm Medix to introduce innovative solutions to enhance milk quality, improve profitability, and combat anti-microbial resistance (AMR).


Another solar farm on the cards

Solar generation company, Lodestone Energy is partnering with Haldon Station, located in the heart of the Mackenzie District, to build and operate a 220 MW utility-scale solar farm.


Machinery & Products

Blender backs agri-tech startups

Product design and development consultant Blender says as part of its commitment to fostering innovation in agriculture and technology, it’s…

» Latest Print Issues Online

Milking It

Rural travel

OPINION: It seems ‘rural travel’ is getting very expensive these days.

Oat dear!

OPINION: A global plant-based milk company has confirmed it is not going ahead with its first UK factory.

» Connect with Dairy News

» eNewsletter

Subscribe to our weekly newsletter