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Inheritance of Black Hair Patterns in Cattle Lacking the Extension Factor for Black (E). I. Blackish¹

Department of Dairy Science and the Institute of Genetics, The Ohio State University, Columbus AND The Ohio Agricultural Experiment Station, Wooster

ABSTRACT

Blackish is the term used by Ibsen (3) to designate hairs found in Ayrshire and Jersey cattle that microscopically were found by Bogart and Ibsen (1) to contain partially extended black clumps. Therefore, both red and black show in such hairs.

Ibsen suggested the symbol Bs to designate the gene for these hairs and concluded that it was inherited as a single dominant and is one of two modifiers of B, the gene responsible for black pigment in the hair and skin.

The presence of E, the other modifier of B, has been postulated to be the gene responsible for complete extension of black pigment in all individual hairs that are pigmented (4). The gene E acts on B to form closely packed clumps of black pigment throughout all pigmented hairs and skin areas.

According to Ibsen (4), neither Bs nor C (red) can be expressed except in the presence of ee, the absence of the extension factor.

¹ Journal Article No. 33-54, the Ohio Agricultural Experiment Station. Part of the data herein reported were taken from a thesis submitted by C. S. Baldwin in partial fulfillment of the requirement for the Master of Science degree, The Ohio State University.

² Present address: Central Ohio Breeding Association, Columbus, Ohio.