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Journal of Dairy Science Vol. 39 No. 4 435-439
© 1956 by American Dairy Science Association ®
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Inheritance of Black Hair Patterns in Cattle Lacking the Extension Factor for Black (E). II. Blackish Pattern1

G. S. Baldwin2, L. O. Gilmore, N. S. Fechheimer and D. C. Rife

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

ABSTRACT

The effect of internal environment on the expression of genes is ideally demonstrated by the reversal of dominance exhibited in traits influenced or modified by relative levels of the sex hormones. The concept of sex-influenced inheritance is but vaguely understood, although generally accepted. Fundamentally, the sex of the heterozygote determines which of two phenotypes is expressed. Conditions of sexual dimorphism exhibited in animals heterozygous for certain autosomal alleles have been reported for pattern baldness in man (8), certain types of horn formation in sheep and cattle (6, 14), and "mahogany" hair color in cattle (5, 12). The object of the study herein reported was to test further this fundamental concept, as well as to add to the knowledge of this specific trait.

Historically, the mechanism of inheritance which "mahogany" presumably demonstrates has been designated as sex limited (5, 13, 15), sex controlled (11), sex modified (11), and sex influenced (10).

FOOTNOTES

1 Journal Article No. 53–55, the Ohio Agricultural Experiment Station. Part of the data herein reported was 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.






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Copyright © 1956 by the American Dairy Science Association ®.