Thursday, 22 May 2025 09:55

NZAEL to update genetic base for Breeding Worth calculations

Written by  Staff Reporters
NZAEL manager, Andrew Fear NZAEL manager, Andrew Fear

DairyNZ subsidiary New Zealand Animal Evaluation (NZAEL) will update the genetic base used to calculate Breeding Worth (BW) next month.

This routine update will cause a drop of approximately $185 in BW across all cows, bulls, and herds but does not reflect any loss in genetic value or animal performance.

To assist with ranking within a population, it's helpful to have a benchmark. In animal evaluation, this reference point is called 'Base Cow'. A Base Cow change causes very minimal re-ranking among bulls, cows, herds, or breeds. It simply shifts animals up or down depending on the genetic base that is chosen. Base Cow creates the yard stick to measure how much genetic progress is being made with each passing generation.

"New Zealand's dairy herd continues to make meaningful genetic improvement. Each generation of heifers enters the herd with higher BW on average, than the previous generation, leading to higher protein, fat and greater efficiency. Updating the Base Cow ensures BW remains an important and accurate ranking tool, reflecting the performance of today's dairy animals," says Andrew Fear, NZAEL manager.

From 20 June, the BW of the average dairy animal will move from $241 to $56. This shift follows the introduction of an updated reference point, known as a Base Cow, which will now be based on 2015-born animals instead of the current 2005 cohort.

More like this

Featured

Open Country opens butter plant

When American retail giant Cosco came to audit Open Country Dairy’s new butter plant at the Waharoa site and give the green light to supply their American stores, they allowed themselves a week for the exercise.

National lamb crop edges higher

New Zealand’s national lamb crop for the 2025–26 season is estimated at 19.66 million head, a lift of one percent (or 188,000 more lambs) on last season, according to Beef + Lamb New Zealand’s (B+LNZ) latest Lamb Crop report.

National

Machinery & Products

» Latest Print Issues Online

The Hound

Political colours

OPINION: Your old mate welcomes the proposed changes to local government but notes it drew responses that ranged from the reasonable…

True agenda

OPINION: A press release from the oxygen thieves running the hot air symposium on climate change, known as COP30, grabbed your…

» Connect with Rural News

» eNewsletter

Subscribe to our weekly newsletter