In reality, the puppies they kill have the same genetic makeup as the Blacks, Yellows, and Chocolates they allow to survive. Midnight Black Silver Factored Front:

A Labrador puppy when it is time for a "special" present could make someone very happy. The existence of Charcoal Labradors is a genetic aspect of Silver Labradors which proves the Silver genetics have been in Labrador lines for many decades, if not centuries. Lastly, if you do not already have your pets on Nuvet Lab Vitamins join us in properly caring for our pets.

Also won the bronze award for Amedei Milk in the "Best milk chocolate bar". This comes into play way before the coat color.