There is a new forum that has just been started on the topic of prolific sheep--- prolific breed sheep such as Booroola, Finnsheep and Romanov as well as ordinary sheep being bred to be more prolific. The forum is at: http://pets.groups.yahoo.com/group/prolificsheep/
I don't have prolific sheep myself, in fact I only had 2 sets of twin lambs out of the whole herd this spring. But I certainly would like to have more prolific sheep and am interested in the breeds and methods of doing so.
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