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RE: Back Breeding
It's possible to produce provably pure using either line- or back-breeding. And, of course, it's always possible for luck to kick in and get a pure trait value from any cross-breeding which actually can be proven.
On average, though, when considered across all breeding programs, back-breeding will yield results about twice as fast.
I don't know where that comment about starters came from. Starters are not required. Perhaps it alludes to the fact that, for most traits, starters are guaranteed hybrids, so can be used in either the back- or line- programs without needing the extra parents a line-breeding program may require.
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