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Amylase Genetic Variation of Serum in Holstein Cattle^{1 ,2,}

Department of Dairy Science, The Ohio State University and Ohio Agricultural Research and Development, Center, Columbus 43210

ABSTRACT

Three amylase phenotypes, AmIB, AmIC, and AmIBC, were detected by electrophoresis of blood serum from 329 Holstein cattle. These phenotypes appear to be controlled by two alleles AmI^B and AmI^C at the amylase I locus (AmI). Frequencies were .518 and .482 for alleles B and C. The numbers of phenotypes corresponded closely to expectations of Hardy-Weinberg equilibrium. No evidence of linkage between the AmI locus and other genetic marker loci of blood and milk was detected.

¹ A contribution from the North Central Region Cooperative Research Project NC-2, Improvement of Dairy Cattle Through Breeding, and the Northeast Regional Research Project NE-62, Relationship Between Genetic Markers and Performance in Dairy Cattle.

² Approved for publication as Journal Article No. 164-78 of the Ohio Agricultural Research and Development Center, Wooster 43210.

³ Carolyn Trowbridge Walters, 125 East 500 South, Hyrum, UT 94319.