Shet x Jacob you will get black lambs (Jacobs are dominant black), sometimes with some white freckles, better (crimpier) fleece than Jacob. Meat size is big like the Jacob, gigot not so long, taste excellent. Males should be horned but I would expect that 50% ewe lambs will be horned, 50% polled.
Shet x Soay is no problem as the Shetland is small boned with a neat head. Lambs will probably be white with some brown or fawn markings, if the tup is white, but coloured if he is coloured, fleece coarser than Shetland, longer than Soay. Lambs will grow to bigger than the Soay, probably closer in size to the Shetland. We have only done this cross once - in the other direction, so Soay x Shet, ewe lamb (white) grew to same size as a Shet ewe - however, I heard that this year she lambed to a commercial tup (don't know what breed) and lost a huge breech tup lamb but is rearing the tiny ewe twin plus a fostered mule lamb. She has previously lambed twice to a Heb tup with no probs.
I feel that it is always better to put first time lambers to their own breed, before trying with a tup of a larger breed.
one of our shetland tup lambs is going to jacob ewes later this year - anyone got any experiences of this mix to share?
and also, could we put a shetland tup to soay ewes without causing too big a lamb for the soays to deliver does anyone know?
thanks