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The Relationship Between -Lactoglobulin Phenotypes and Milk Composition in New Zealand Dairy Cattle

New Zealand Dairy Research Institute, Dairy Farm Road, Private Bag 11 029, Palmerston North, New Zealand

Bulk milk collected from -lactoglobulin AA phenotype cows had a composition that was markedly different from that of -lactoglobulin BB phenotype cows. The -lactoglobulin AA phenotype bulk milk had 28% higher whey protein concentrations, 7% lower casein protein concentrations, 11% lower fat concentrations, and 6% lower total solids concentrations than -lactoglobulin BB phenotype bulk milk. The higher whey protein concentrations in -lactoglobulin AA phenotype bulk milk result from large increases in -lactoglobulin concentrations in this type of milk. However, concentrations of -lactalbumin were lower in -lactoglobulin AA phenotype bulk milk. Apparently high concentrations of -lactoglobulin or the presence of the -lactoglobulin A variant gene suppresses the synthesis of the other major milk proteins.

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