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[Moneo]

What you said sounds like mixing weight and volume. Can that be true?

I'm not a dairy person or a person of any sort for that matter. . .

I'm not sure about this, but perhaps it IS measured in litres ("12-45 litres per day for each [cow]"). Then, the butterfat is weighed in KG?

Combination of volume and weight sounds probable, though the reason for doing it evades me.

Using both volume (liters) and weight (butterfat) would make sense. The problem is that herd management systems would need to compute and carry both measures. The systems I've seen carry one or the other.

The volume is easy to understand. The weight in pounds of butterfat is a bit tricky. In the USA they are more concerned with how much butterfat is in a particular cow's milk. The higher the butterfat content the more acceptable and sellable is the milk, i.e., quality over volume. If a cow is not of the best breed, or not in the best of health, then her milk would be lower than average in butterfat.

A regular grade (not registered) cow will have about 3.3 to 3.5% of butterfat. Registered cows will get as high as 3.8%.
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