I am reading "The Mating and Breeding of Poultry" Harry M. Lamon and Rob R. Slocum, 1920. Great book, but there are a few times in the book when the author says something like ....."it is still just a theory" or "there are two schools of thought on the matter." In the section on breeding for increased egg production the author states that according to one prominent researcher, the genes for egg laying ability are inherited by the rooster from both the dam and the sire, but pullets can only inherit this trait from their fathers. He then goes on to say that there are many other breeders, however, who do not agree with this conclusion. So, 90 years later, do we understand any better how the genetics for egg laying ability behave in the breeding pen? Thanks for any info you can bring to the table.