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The activity of sodium-potassium ATPase was assessed in erythrocytes from calves of both sexes with either low or high pedigree indices for milk yield. Animals were sampled in both fasted and fed states, and enzyme activity was determined in minimal essential medium ± fetal calf serum. Genotype did not influence enzyme activity, but effects of sex, feeding level and incubation medium were observed. Key words: Calves (dairy), genotype, sodium-potassium ATPase, erythrocyte, sex, incubation medium

The influence of sex, feeding and genotype on sodium-potassium ATPase activity in erythrocytes from young dairy calves