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A Study of Some Possible Genetic Causes of Mummified Fetuses in Dairy Cattle

Kentucky Agricultural Experiment Station, Lexington

ABSTRACT

A total of 23 mummified fetuses was recorded among 1,509 pregnancies of 504 cows. Thus, mummified fetuses were produced by 3.7% of the cows and in 1.5% of the observed pregnancies. It was found that 29.9% of the pregnancies resulted in mummified fetuses in those cows which produced mummies. On the other hand, of the 20 bulls which were known to have sired mummies, only 4.2% of their offspring were mummies. Chi-square values, used to test the cloiseness of fit of various observed ratios to expected Mendelian ratios regarding the occurrence of normal males and females and mummified fetuses, indicated that the mummification process is not due to a homozygous autosomal recessive gene but may be due to a sex-linked recessive lethal gene.