The Slate or Blue Slate Turkey variety is named for its color, which is solid to ashy blue over the entire body, with or without a few black flecks. It is also called the Blue or Lavender Turkey. Hens are lighter in hue than the toms. The head, throat, and wattles are red to bluish white. The beak is horn in color; the eyes are brown; and the beard is black. The shanks and toes are pink.
The Slate was accepted by the American Poultry Association in 1874. The Slate is less well documented and more variable in type and color than any other variety. This makes it more challenging to breed consistently than the others. Its production potential today is not known. However, renewed interest in the biological fitness, survivability, and superior flavor of the Slate has captured consumer interest and created a growing market niche.
While most early texts state that the Slate Turkey originated from a cross of the Black Turkey on a White Turkey, there is little genetic evidence to support such a conclusion. The Slate gene is a legitimate mutation that arose just as the gene for blue in the Andalusian Chicken as a result of an unrecorded mutation. One added element of confusion in defining the variety is that there are actually two different genetic mutations (one dominant and one recessive) that produce the blue slate color, and these create slightly different shades. White and rusty brown markings my be present but are considered a defect.
The Standard weight for a young tom is 10 kg and 6 kg for a young hen. Many birds may be smaller than the standard. Careful selection for good health, ability to mate naturally, and production attributes will return this variety to its former stature. It is currently listed as “Watch” on America Livestock Breeds Conservancy’s Conservation Priority List. A variety listed as “Watch” is defined as fewer than 5,000 breeding birds in the United States, with ten or fewer primary breeding flocks, and globally endangered.