Herd lactation yields as a rule of thumb range from 180 times to 200 times their peak daily milk yield. The former multiplier applies to late calving creamery milk herds and the latter to winter milk and early calving creamery milk herds. To maximise the milk output potential of dairy herds it is crucial to ensure that cows milk to their maximum potential 6 to 8 weeks after calving.
A yield increase of 2 litres/cow/day at that stage of lactation increases lactation yield by between 360 litres (79 gallons) and 400 litres (88 gallons) depending on calving date. This is achieved by feeding 1kg of molasses/cow/day.