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Polymorphisms of β-lactoglobulin, β-casein, α s1 -casein, and κ-casein were investigated in milk from the Kerry breed using starch-gel electrophoresis. Incidences of protein phenotypes and their controlling genes were compared with those from other European breeds. Milk from the Kerry breed contained only Variant A of β-casein and only Variant A of hemoglobin, thus resembling Northern European breeds, especially the Ayrshire and Shorthorn breeds.
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Murphy et al. (1969) studied this question.
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