The variation in milk composition from individual þ-lactoglobulin
AA and BB phenotype cows
J.P. Hill, G.R. Paterson
Food Science Section, New Zealand Dairy Research Institute, Private
Bag 11029, Palmerston North, New Zealand.
Proceedings of the New Zealand Society of Animal Production 1994,
54: 293-296
Studies in New Zealand have shown that bulk milk collected from groups
of ·-lactoglobulin AA phenotype cows has a different composition to bulk
milk collected from groups of þ-lactoglobulin BB phenotype cows (Hill, 1993).
Although all cows used in this study were different to those used by Hill
(1993), differences in composition were similar with the ·-lactoglobulin AA
phenotype cow group producing milk which contained less casein, fat and total
solids than ·-lactoglobulin BB phenotype cow group. No significant
differences was observed in the total protein, lactose or ash content in the milk
of the two phenotype groups. In comparison with the þ-lactoglobulin AA and
BB phenotype bulk milks, large variations in composition were observed in the
milk from individual cows. As all cows were fed on identical pasture and
subjected to identical farm management practices these results indicate that in
addition to þ-lactoglobulin phenotype other genetic factors can have a
significant influence on the composition of milk.
Keywords: NZSAPAB;
Milk composition; þ-lactoglobulin phenotypes.
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Last Updated 25-01-1997
