For years, fat has been treated as a simple number in the ration.

Higher percentage meant higher energy. Higher energy meant better performance. That logic has shaped feeding decisions across the industry for a long time.

But in practice, it does not always hold up.

Two feeds can have the same fat percentage on paper and deliver very different results in the cow. Milk yield, butterfat, intake and overall consistency can all vary, even when the headline specification looks identical.

That is because fat percentage only tells part of the story.

The problem with focusing on fat percentage

Fat percentage is a blunt measure. It tells you how much fat is present, but not what that fat actually is.

Different fats are made up of different fatty acids. Those fatty acids behave very differently in the rumen and in the cow’s metabolism.

• Some support milk fat production.
• Some influence energy supply and utilisation.
• Some are more stable and consistent than others.

So while two products might both be labelled at the same fat level, their impact on performance can be completely different.

This is where many ration decisions start to fall down.

What actually drives performance

If fat percentage is not the full picture, what should you be looking at instead?

It comes down to the fatty acid profile and how that translates into real, consistent energy supply.

Performance on the farm is not just about how much energy is in the ration. It is about how reliably that energy is delivered and used by the cow.

When energy supply is consistent:

• Intake is more stable
• Milk yield is maintained
• Butterfat and protein are supported
• Cows cope better with ration changes

When energy supply is inconsistent:

• Intake can fluctuate
• Milk solids can dip
• Performance becomes harder to predict

That difference often comes back to the type of fat being used, not just the amount.

Why this matters at turnout

This becomes particularly important during periods of change, such as turnout.

At this time of year, rations are shifting, grass quality is variable, and cows are adapting to new conditions. Energy supply can easily become inconsistent, even when the ration looks correct on paper.

Relying on fat percentage alone does not protect against that. Understanding how different fatty acids behave, and how they contribute to a more stable energy supply, becomes far more valuable.

Moving beyond the number

The industry has already gone through this shift with other nutrients.

Protein used to be viewed in simple percentage terms. Now it is widely understood that amino acid balance matters far more than crude protein alone.

Fat is moving in the same direction.

Looking beyond fat percentage and focusing on fatty acid composition allows for more precise, more consistent feeding decisions.

This is where UFAC’s approach is different. Rather than focusing purely on fat inclusion, the emphasis is on how specific fatty acids support performance, efficiency and consistency in real systems.

A more practical way to think about fat

Instead of asking:
“How much fat is in this product?”

A better question is:
“What will this actually do in the cow?”

Will it:

• Support consistent intake?
• Maintain milk solids?
• Deliver repeatable performance?
• Work reliably through the ration?

Those are the outcomes that matter on the farm, particularly at key points in the season.

Final thought

Fat percentage is still useful, but it should not be the deciding factor.

Two products can look the same on paper and behave very differently in practice.

Understanding what sits behind that number, and how it affects real performance on the farm, allows for better decisions to be made and more consistent results to be achieved.

If you are reviewing fat sources in your ration, focusing on fatty acid profile rather than just fat percentage can make a significant difference to consistency and performance.

UFAC specialise in fatty acid-based supplements designed to support energy supply, intake and milk solids across a range of systems.