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Bovine plasma alkaline phosphatase activity in relation to age, J substance and β‐lactoglobulin phenotypes
Author(s) -
Agergaard N.,
Larsen B.
Publication year - 1974
Publication title -
animal blood groups and biochemical genetics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.756
H-Index - 81
eISSN - 1365-2052
pISSN - 0003-3480
DOI - 10.1111/j.1365-2052.1974.tb01308.x
Subject(s) - phenotype , alkaline phosphatase , endocrinology , medicine , biology , chemistry , microbiology and biotechnology , enzyme , biochemistry , gene
Summary In Jersey cattle the plasma alkaline phosphatase (AP) activity was found to be markedly age‐dependent. Among animals grouped with regard to age a marked decrease in the average plasma AP activity was shown to take place until an age of 2 1 / 2 to 3 years. For the J substance and β‐lactoglobulin phenotypes a dependency of age was not observed in the material studied. Excluding animals less than 3 years old and thus eliminating variation in AP activity due to age, a significant association (P<0.01) between AP activity and J phenotypes was observed among 91 animals. The J cs phenotype was associated with low AP activity and the j a phenotype with high AP activity. On the average the J substance phenotypes, J cs , J s and j a , exhibit an increasing plasma AP activity of 3.6, 4.2 and 6.8 King Armstrong Units, respectively, and a corresponding decrease in J substance. In a similar comparison of the β‐lactoglobulin phenotypes and plasma AP activity involving 82 lactating cows, an excess of the β‐lactoglobulin BB phenotypes with high AP activity just at P = 0.05 was observed.