Originally posted by knighttemplar1960:

According to the wiki the game gives a 50/50 chance of the offspring having the same star level as either parent. I haven't done any experimenting with disparate star level livestock to confirm or deny that as yet.

Now I'm interested to see what happens when you breed a 2 star with a no star.

This is true only if the parents aren't the same lvl. If you breed a 2 star with another 2 star there is a 100% chance of getting another 2 star.