I don't know if this is what they mean, but this is why I PERSONALLY believe you 'have to have a female' for recessives.
Let's say you want to make a pastel clown.
You can raise a pastel female up to 1500g and simultaneously raise up a male clown... his weight doesn't really matter here. You breed them together and get a pastel het clown female. You raise her up to 1500g again and then breed her back to the dad for a chance at the pastel clown.
Option 2: You raise a clown female to 1500g and simultaneously raise a male pastel to whatever weight. You breed them and get a male pastel het clown. Now instead of having to raise it to 1500g and wait to get it producing follicles etc, you can usually breed a male within the same year it was born and at only 5 - 700 grams.
You just saved yourself 2 years essentially. In this way, you kind of 'have to' have female visual recessives if you want to work with recessive combos. There are plenty of exceptions to this, of course.
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