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Physiological and Pathological Factors Influencing Bovine Immunoglobulin G₂ Concentration in Milk

Université Pierre et Marie Curie, 96 bd Raspail 75006 Paris, France

B. Poutrel

Institut National de la Recherche Agronomique, 37380 Nouzilly, France

ABSTRACT

Bovine IgG₂ concentration was determined by radial immunodiffusion in 355 milk samples of uninfected quarters, 101 milk samples of infected quarters, and 118 blood serum samples from 42 Holstein-Friesian cows taken at 30, 150, and 270 d. Concentration of IgG₂ in blood serum (11.3 mg/ml) was highest at the beginning of lactation (30 d). Immunoglobulin G₂ concentration in milk (16.81 µg/ml) from cows with uninfected quarters was not affected by quarter location but was correlated with IgG₂ concentration in blood serum (.30; P<.001). The IgG₂ concentration in milk was lower in midlactation (150 d: 14.81 µg/ml) and in the two first lactations. Immunoglobulin G₂ concentration in milk was correlated with SCC.

Quarter infection by Corynebacteriutn bovis or major pathogens increased IgG₂ concentration up to 47.9 µg/ml for Staphylococcus aureus. Only S. aureus influenced IgG₂ concentration in blood serum. Correlation between IgG₂ content and SCC in milk decreased when quarters were infected, regardless of bacterial species.