In 1996 Metzer Farms developed the Golden 300 Hybrid as they lay more and larger eggs than the Khaki Campbell duck and have a calmer temperament with a higher fertility. The Khaki Campbell may be a good egg producer in small flocks but they were never satisfied with their production in their larger commercial flocks. Because of this inconsistency, Metzer's developed the Golden 300 Hybrid by crossing and utilizing the attributes of different duck breeds. The Golden 300 Hybrid can be sexed at any age by its color as the males are shades of black and the females are shades of brown. Unfortunately, they do not retain this characteristic in future generations. Their progeny will hatch in blacks, yellows and browns with no relationship between sex and color.