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 β-lactoglobulin, αS1-casein, β-casein, and κ-casein. Linkage was evident between the A and hemoglobin loci, the J and β-lactoglobulin loci, the αS1-casein and β-casein loci, the αS1-casein and κ-casein loci, and the β-casein and κ-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 β-lactoglobulin locus and the casein complex. Linkage could be excluded for most other combinations at .25 recombination.