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Genetic Analysis of the Serum Level of IgG₂ and Total Protein in Red Danish Cattle,^{1, 2,}

Royal Veterinary and Agricultural University,³ Bülowsvej 13, DK-1870, Copenhagen V., Denmark

Abstract

Concentrations of the total protein and the immunoglobulinsubclass IgG₂ in serum were determined from unselected half-sib groups of registered herds of Red Danish Cattle. The sampling was made in April 1972, comprising individuals from 4 to 38 months of age.

Correction for age reduced the variance for total protein and IgG₂ by 11 and 12%, respectively. Higher ages, in both cases, corresponded with higher values. The serum-IgG₂ concentration corrected for total protein and age showed an almost normal distribution ranging from about 0 mg/100 ml to more than 700 mg/100 ml.

The simple correlation between total protein and IgG₂ in serum was .49. However, this includes some autocorrelation.

Heritability estimates of the two traits suggested a slight genetic influence on total protein (h² = .09 ± .07) and IgG₂ (h² = .12 ± .08).

¹ The investigation was supported by a grant from Godsejer Viktor A. Goldschmidts Legat, afd. B.

² The nomenclature for the bovine immunoglobulins in this paper is in accordance with that recommended by the symposium: "Bovine Immune System" convened by the American Dairy Science Association in Maryland, U.S.A. 1970. J. Dairy Sci. 54:1309.

³ Department of Animal Genetics.