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NEW DATA SHOWS GOOD ENERGY LEVELS IN WINTER GRASS

Winter grass emerging from a blanket of snow and frost does so with a surprisingly
high ME content and the phenomenon can help sheep farmers delay compound
feeding and conserve meager, yet highly valuable forage stocks for later in the
season.

Rumenco has just released new forage analysis data based on samples of grass
collected around the country in January (see table). Grass was collected from eight
sites, all of which had suffered from prolonged snow cover during December and
early January.

“We expected the grass to be of extremely low quality, but whilst dry matters and
protein levels were notably reduced, energy levels, paradoxically, were consistently
high,” reports Rumenco technical manager David Thornton.

Average protein level was 16.8%, yet the mean energy level was 12.4MJ/Kg DM with
sugars a reasonably healthy 14.4% – plenty enough to sustain a mid term, twinbearing
ewe provided she has access to Rumevite feed blocks to encourage foraging
behaviour. The dry matters are low, but this is not a major issue in mid-pregnancy
before foetuses begin their rapid growth, he points out.

“The results surprised us, but it has been suggested that the snow may have
protected the grass from wind chill. It has also been shown that light passes through
snow and, indeed, may even be magnified when it moves through the ice crystals.
Consequently, the grass will continue photosynthesising well, even though it is
covered by a white blanket.”

This latest data suggest many sheep producers will have better than expected
nutrition in their late winter pastures and may even be able to delay the introduction
of expensive compounds. With conserved forage values also at an all-time high and
stocks dwindling fast, the news is a welcome boost for producers struggling with the
consequences of such a harsh winter.

“Many ewes are in quite a fit condition, having benefited from having access to
conserved forages and feed blocks while snow lay on the ground. This means it
should be possible to delay cake feeding on many units, even if forage stocks are
short. Rumevite feed blocks provide all the supplemental nutrition the ewes need,
and encourage the sheep to make the most of the winter grass that is available to
them,” David Thornton says.

However, Mr Thornton cautions against grazing winter pastures too hard for too long
at the end of the season, as this can delay spring grass growth needed for lactating
ewes and lambs.

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