With the BIG number of bred lambs it'll be close to 50/50%. You won't go around statistics doesn't matter what unless other factors come in play (which is not according to the rules of the game). Now, if you speak of only 10 lambs (or even 20 or 30) statistically it's just NOTHING. So yes, you can get 20/80%, but it doesn't prove anything because of the statistical error (which is HUGE in such a small sample).
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