Got this info compliments of JK Ottoman at Retriever Results, but found it VERY interesting since we are so fixated on Sires all the time
Recently a subscriber asked us about "blue hens" and suggested we use the Retriever Results database to identify these special dogs.
From our preliminary research, we learned that a "blue hen" is a bitch that features prominently in the pedigrees of successful dogs. To us, it sounds like the female equivalent of "dominant sire."
Using the dogs qualified for this year's National Amateur, we took a look at three generation pedigrees for 142 labradors.
394 (40% of the total) are unique Labrador bitches
Nineteen of them (5%) represent 42% of all bitches in the pedigrees
Most of the dogs on the list (69%) appear in just one pedigree.