Dairy farmers hitting the predicted variations in the feed value of their mid-winter silage stocks need to keep a close eye on the make-up of their complete diets to avoid a sudden shortfall in protein levels.

“Grass silage analyses have flagged up some very low protein levels this winter so it’s important for farmers to be aware of the feed value of each of last summer’s grass cuts as they work through winter silage stocks,” said Dr Phil Holder of molasses-based liquid feed supplier E D and F Man.

Silage protein levels have already triggered concern among consultants working with dairy farmers. Some analyses have shown diets are having to cope with protein levels as low as 10 per cent.

Farmers who are now well into their silage stocks shouldn’t base complete diets on one silage analysis.

“Variability of silage is the big issue farmers are facing this winter with some significant differences between cuts on the same farm,” said Dr Holder, so double-checking to find out exactly what feed value the silage is providing as the various cuts go into the mix will make sure any protein shortfalls are addressed.

“Incorporating a high protein molasses based liquid feed helps the rumen bacteria to thrive and improves rumen fermentation leading to better fibre digestion and improved animal performance.

“The aim is to provide a combination of high sugar content to stimulate the rumen bacteria as well as providing rumen degradable protein when silages are low in protein,” said Dr Holder.

“Grass silage is still the cheapest feed on the farm so feeding a molasses-based supplement at 1.5-2kg per head to ensure intakes are maintained is the most economical way of increasing the protein level of the diet.”