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The Journal of Heredity 1985:76(5):379-381
© 1985 The American Genetic Association 76:379-381

other

Male mule foal qualifies as the offspring of a female mule and jack donkey

O. A. Ryder, L. G. Chemnick, A. T. Bowling, and K. Benirschke

Drs. Ryder and Benirschke, and Ms. Chemnick are affiliated with the San Diego Zoo, P.O. Box 551, San Diego, California 92112; Dr. Benirschke also is affiliated with the Department of Pathology, School of Medicine, University of California-San Diego, La Jolla, CA 92093. Dr. Bowling is affiliated with the Serology Laboratory, School of Veterinary Medicine, University of California, Davis, CA 95616. The authors are grateful to Mr. and Mrs. Bill Sylvester of Champion, Nebraska for allowing their animals to be studied and to David Johnson, D.V.M. of Imperial, Nebraska for obtaining the blood samples necessary for these studies. The authors gratefully acknowledge the American Donkey and Mule Society, particularly Mrs. Betsy Hutchins, for their continued interest in scientific inquiry of mule fertility. Supported by NIH grant GM 23073. Please address reprint requests to Dr. Ryder.

Abstract

Whereas mules are normally considered sterile, reports of fertile female mules persist. However, none subjected to cytogenetical and blood typing analyses could be confirmed as having indeed been mules that transmitted maternal markers to their alleged offspring. Reported here is the case of a cytogenetically verified female mule whose alleged male foal qualifies as offspring by a male donkey. The male foal is karyotypically a mule.


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