Police have launched an inquiry after five ewes and two lambs were killed on a Denbighshire farm.
BBC: Seven sheep savaged to death in Llandyrnog field attack
These effects were probably the result of some biochemical changes Dr Dunlap saw in the treated ewes.
Wroxham Barns usually take extra lambs from ewes on local farms that are unable to feed their young.
BBC: Wroxham Barns' supply of lambs hit by Schmallenberg virus
The RBST said the breed had experienced a "resurgence in its fortunes" with almost 4, 000 UK ewes now registered.
The Jacksons, who have 50 pregnant ewes on the farm and one ram, have decided to keep Geraldine and Joan.
Earlier this week, a Conwy hill farmer said his sheepdog had helped him find and rescue 70 ewes in two days.
By the 20th day after mating, almost all the treated ewes had lost their embryos, but none of the controls had.
Cumbrian farmers lost hundreds of ewes and lambs during March's cold weather.
Half the ewes were examined 16 days after mating (ie, eight days after the treatment) and the other half 20 days after mating.
She said the mother, nicknamed Geraldine after Peter Kay's character Geraldine McQueen because she is "big and beautiful", was one of her favourite ewes.
Last week, Frank Jackson, who farms on the fells at Marton, near Ulverston, said he had lost at least 60 pregnant ewes in snow drifts of up to 20ft (6 metres).
Having created a morpholino for the env messenger molecule, Dr Dunlap injected it into a series of ewes eight days after they had mated and sat back to see what would happen.
Mr Raw added that his farmhouse had "never looked cleaner" in preparation for the visit and that he would be taking the prince up into the Cambrian Mountains to see his ewes and cattle before the meeting.
Colin Evans, who farms at Pant y Goitre farm in the Usk Valley in Monmouthshire, said between 20 and 25 lambs born to his 800 ewes appeared to have been affected by Schmallenberg - up to 5% of the flock.
At 16 days, the embryos and their associated membranes in the treated sheep were much smaller and more fragile than those of ewes that had been injected with morpholinos that do not interfere with env messengers, and were being used as controls.
The owners of the farm on Llanddaniel, near Gaerwen on the island - which has been badly hit by the outbreak where more than 40, 000 sheep have been culled - had been part of a group who successfully argued against the slaughter of their 60 ewes, lambs and three cattle.
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