It is well established that there are huge losses in dry matter during silage making. The data suggests that the average clamp silage losses are 25% between cutting and feeding, whereas the average baled silage loss is much lower at 10%. Therefore on an average farm making clamp silage, for every 100 tonnes ensiled only 75 tonnes are fed. Whereas on the average farm using baled silage - for every 100 tonnes ensiled 90 tonnes are fed. So if we now do the costs per tonne of silage fed -the clamp silage is £31.04 and baled silage is £31.59 - looking much more comparable.
If we are to maximise the use of grazed grass, then the last thing we should be doing is taking 50% of our grassland fields out of the rotation in order to ensure all the grass is cut at the same time to fill the silage clamp. Rather, we should be removing fields through the season as grass growth gets ahead of demand.
This will result in different fields being at different stages of growth and requiring harvesting at different times. This doesn't fit with clamp silage production but fits very well with baled silage production with smaller areas being harvested as and when they reach the best stage of maturity for the stock they are intended to feed the following winter. This approach enables best-grazed grass and silage to be fed. How do we put a value on this?
Finally, we have two more advantages by using baled silage in our farming system. Firstly, not all our silage is at the mercy of one week of bad weather when it reaches the ideal stage of growth for high-quality silage. Missing that window can cost thousands in bought in supplemental feed after a week or two's delay in cutting due to poor weather. By using bales and different harvest times the weather risk is spread over the whole growing season. Secondly, not all the stock need high ME and Crude Protein silages. For example, our dry cows, be they Suckler or Dairy require a much poorer nutritive value than growing beef, milkers or pregnant ewes. So once again the bale offers the opportunity to mix and match both quality and quantity to each group of stock we have on the farm - a potentially huge cost saving.
Therefore, when we are thinking of feed costs we need to take a holistic approach. We should not take feed costs at face value but delve deeper into the real costs and consider where do they fit into the whole farm plan.
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