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Reducing silage waste: How silage and grazing can be better used

While grassland farmers are familiar with trying to reduce silage waste in the clamp, it can be argued reducing waste starts with the harvested crop in the field.

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Reducing silage waste: How silage and grazing can be better used

Roy Eastlake, technical support manager at Biotal, believes cutting only what can be picked up the same day will bring big benefits, whether you follow a typical cutting programme or have converted to a system of more frequent cutting.

 

He explains grass starts to dry out once it is cut, which is a good thing as wilting helps concentrate sugars, reduce the risk of pH buffering and improve eventual DM intakes.

 

However, the length of wilt needs to be carefully managed. On a typical sunny and breezy day, grass will lose moisture at a rate of at least 1 per cent per hour, but this can be as high as 2 per cent per hour in favourable drying conditions.

 

While it does not dehydrate as quickly at night, the moisture content does not rise again.

 

“Ideally you want grass to be ensiled at about 32 per cent DM, which is the optimum for fermentation efficiency and subsequent dry matter intakes,” he says.


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Optimum

 

“If grass is cut at 20 per cent DM it will hit the target for ensiling in about 12 hours, making this the optimum wilt length.”

 

He adds moving to ‘silage in a day’ reduces risk and increases consistency of forage produced and by managing the crop in the field, it results in better feed quality. He advises cutting in the morning once the dew has lifted and picking up in the afternoon.

 

“However, with the area of first cut on most farms, cutting in the morning and collecting in the afternoon will be impractical. So some will need to be cut late afternoon and collected first thing in the morning, still giving a 12-16 hour wilt, with a reduced rate of drying overnight but achieving the target dry matter.”

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