Eye Colors of the Nigerian Dwarf
Blue eyes are a simple, dominant trait. Brown eyes are recessive. At least one parent must be blue eyed to get blue eyed offspring. They cannot "skip" a generation. Brown eyed mated to brown eyed will always result in brown eyed offspring. Since blue eyes are dominant, homozygous blue eyed is possible. Goats carrying two copies of the blue eyed gene are homozygous blue eyed. These goats will produce 100% blue eyed offspring. Goats carrying one copy of the blue eyed gene and one copy of the brown eyed gene are heterozygous blue eyed. These goats will produce 50% blue eyed offspring when mated to brown eyed. Goats carrying no copies of the blue eyed gene are homozygous brown eyed. These goats will produce no blue eyed offspring when mated to brown eyed.
In very rare cases there have been Nigerian Dwarf Goats with one blue eye and one brown eye. This is more likely to occur from lack of pigment due to white spotting and not by an inheritable gene.
Bl Bl - Homozygous blue eyed. Is blue eyed and will always produce blue eyed kids, regardless of mate.
Bl bl - Heterozygous blue eyed. Is blue eyed, but carries the brown eyed gene.
bl bl - Brown eyed. Does not carry the blue eyed gene and will never produce a blue eyed offspring unless bred to a blue eyed mate.
The chart below shows possible matings between blue eyed and brown eyed goats.