dum question, you do that to get the first cross....
Dumb reply :-)
Why do you need a half cross? Why not just cross 2 working dogs with a good chunk of collie in them?
Everyone try's to complicate breeding dogs and have half of this and quarter of that.
give your head a wobble, first cross isnt half cross...
yes it is ..
a first cross will always be a half cross but a half cross wont always be a first cross