Donald Shaver search widely for diversified breeding stock. Local breeders, knowing his reputation were reluctant to sell to him for fear of competition. In 1946, there were 256 registered chicken breeders in Canada. Shaver Poultry became the 257th. By 1958, only Shaver remained, along with seven other major poultry breeders worldwide. The principle of hybrid vigour had been well established for corn, but the costs and time required to test chicken crosses were higher. Small breeders (as Shaver was at the time) could not afford permanent scientific staff, so Shaver obtained assistance from geneticists conducting research at universities and government institutions. Shaver
Callus shaver used during the after-treatment of working with a callus shaver. The callus shaver and other instruments date back to the instruments mentioned by the Frenchman Nicolas-Laurent LaForest in his 1782 book "L’art de soigner les pieds". Callus shaver A callus shaver (also called a credo knife) is a tool for the medical and cosmetic removal of a callus, mainly on the feet (see also pedicure), or hands. Technically speaking, its function is the abrasive treatment of hyperkeratotic skin lesions. The callus shaver consists of a handle, which is usually arched, and a blade made of ceramic or metal. Because the