August 1, 2017

Gestation length added as new trait

In April 2025, the US dairy genetic base was updated to reflect the amount of genetic progress made since the last base change five years ago.

Gestation length added as new trait

The Council on Dairy Cattle Breeding (CDCB) is adding gestation length as a new trait to be released with August 2017 proofs.

Gestation length can be most useful as a genetic tool for herds that implement seasonal calving. These herds will have the option of choosing service sires with shorter gestations for cows that didn’t settle to the first breeding.

Gestation length can also be a useful predictor of a cow’s calving date, which allows for more efficient management of close-up and maternity pen moves.

As of now, gestation length will not be included in TPI or the Net Merit index.

As new traits like gestation length are released, it’s important to keep your farm’s current situation and future goals front of mind. Work with your trusted Alta advisor to review your customized genetic plan. Only incorporate new traits like gestation length into your plan when they aid your farm’s goals and bottom line.

 

How does this genetic base change compare to previous base changes?

We’ve made more genetic progress in the past five years than during any other five-year span in recent history.

The charts below show the base change numbers for 2025, 2020, 2015, and 2010. As you can see from the charts, the base change in 2025 is significantly more for most traits than it was for previous base changes.

That means we’ve made more progress over the last five years than during any other five-year span in recent history.

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