David Irwin and his family have to run a tight ship with 170 cows on 220 acres. With much of the soil a heavy loam sitting on top of red clay, some areas are too wet and steep for cropping so end up grazed by youngstock in the summer, with the rest – bar 50 acres of spring barley – used for grass silage production.
David says approximately 120 acres of silage is taken in three cuts each year in May, July and at the end of August, and this is usually enough to supply the stock with forage all year.
“We milk three times daily and house year-round, feeding all cows and followers a TMR ration,” explains David. “This is based on grass silage with homegrown barley, then bought-in straights including double zero rapemeal, sugar beet pulp, ground maize, distillers’ grains and soya, plus added chopped wheat straw for fibre.
We block calve the cows between October and January, mainly a lifestyle choice to get some time off in the summer, and we sell all the milk to Lakeland for manufacture into powder.
We started low, replacing 0.1kg/head of chopped wheat straw per feed with 0.1kg NIS. Most of the cows were on a low yielder diet by that point with 2kg straw, but once we’d worked up to replacing the first kg, we had the confidence to replace the rest in one go. It was clear the cows were really happy with it and we’d already noticed a difference.
David said the biggest change within a few days was the dung became far more consistent across the herd with almost all looseness disappearing. “The cows stopped sorting the ration and a knock-on effect of this was we suddenly didn’t have cows rushing to feed as soon as the wagon came along; having a consistent ration around the clock meant a far more leisurely, low stress environment in the cubicle shed. We hadn’t realised the extent to which this ‘stampede’ was happening until it stopped.”
David reports that now the cows are calving in again, intakes are up by around 5% and they’re getting about two litres more per cow per day than this time last year. “There’s been no change in butterfat, but levels have been maintained while the litres have risen.”
In terms of raw material cost, David says it’s like for like when comparing NIS against buying good wheat straw then chopping it, if you include the mess and hassle of chopping straw. The main benefit to our business is the extra milk sold per cubicle. We know effective fibre is needed in the diet – through NIS we’ve hit on a good way of getting it into the cow and keeping her more nutritionally stable.”
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