Thursday, 22 April 2021 10:55

Care needed flushing ewes on lucerne

Written by  Staff Reporters
Lincoln University Professor Derrick Moot. Lincoln University Professor Derrick Moot.

Farmers considering using lucerne as a flushing feed going into ewe mating should be cautious, especially if the weather has been wet and warm.

Lincoln University's Professor Derrick Moot says warm, wet weather is conducive to the development of fungal infections in lucerne crops. The plant responds to these infections by producing coumestrol, an oestrogenic compound which suppresses ovulation - particularly in young sheep.

While ewes can be flushed on lucerne, Moot says ewes should be removed 1 - 14 days before they go to the ram. They can be returned to the crop immediately after they have been mated.

Moot says the weather conditions, which increase the risk of elevated coumestrol levels in lucerne, usually means there is plenty of grass available and this should be the first option as a feed over mating.

From a flock perspective, the mixed-age ewes are less susceptivle to increased coumestrol levels than ewe lambs.

Where there is limited pasture available, he suggests keeping the ewe hoggets on lucerne while the mixed-age ewes are mated and then swapping them around - provided the ewe hoggets are off the lucerne 10 - 14 days before they go to the ram.

Moot says there is no quick test available to analyse coumestrol levels, but ewe lambs can be used as the canary in the mine. If, after grazing lucerne, ewe lambs develop pronounced udders and/or teat elongation then coumestrol levels will be elevated.

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