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Linkage Relationships Among Loci of Polymorphisms in Blood and Milk of Cattle^1,2,3,4,

The Ohio State University and Ohio Agricultural Research and Development Center, Columbus 43210 Delaware Agricultural Experiment Station, Newark 19711 US Department of Agriculture, Science and Education Administration, Beltsville, MD 20705

ABSTRACT

Sequential probability tests were employed to examine genetic linkage among cattle A, B, C, F, J, L, M, S, Z, and R' blood group loci, the hemoglobin locus, the serum transferrin, amylase, and alkaline phosphatase loci, and the milk protein loci ß-lactoglobulin, _S1-casein, ß-casein, and -casein. Linkage was evident between the A and hemoglobin loci, the J and ß-lactoglobulin loci, the _S1-casein and ß-casein loci, the _S1-casein and -casein loci, and the ß-casein and -casein loci. Recombination fractions for these respective combinations were 0, .18, .03, .04, and .06. There was a suggestion of possible loose linkage (recombination fraction = .4) between the ß-lactoglobulin locus and the casein complex. Linkage could be excluded for most other combinations at .25 recombination.

¹ Journal Article No. 156-79, Ohio Agricultural Research and Development Center.

² Data from the NE-62 Regional Research Project,Relationship Between Genetic Markers and Performance in Dairy Cattle. Members of the NE-62 Technical Committee: C. W. Arave, UT; H. C. Dickey, ME; S. N. Gaunt, MA; G.F.W. Haenlein, DE; G. L. Hargrove, PA; H. C. Hines, OH; A. C. Hunter, MN; C. A. Kiddy, SEA-USDA; R. E. Mather, NJ; P. R. Shellenberger, PA; G. W. Trimberger, NY; C. W. Young, MN; J. P. Zikakis, DE.

³ Data from research project, The Relationship of Genetic Biochemical Differences in Blood and Milk of Guernsey Cattle to Their Economically Important Traits, Delaware Agricultural Experimental Station, Newark, DE, and Ohio Agricultural Research and Development Center, Wooster, OH, cooperating. Supported in part by funds supplied by Guernsey breeders, the American Guernsey Cattle Club, and the University of Delaware Research Foundation.

⁴ Hines and Trowbridge, OH; Zikakis and Haenlein, DE; Kiddy, MD.