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Physiological and Pathological Factors Influencing Bovine -Lactalbumin and ß-Lactoglobulin Concentrations in Milk

Institut National de la Recherche Agronomique (INRA), Station de Pathologie de la Reproduction, 37380 Nouzilly, France

ABSTRACT

Bovine -lactalbumin and ß-lactoglobulin concentrations were determined by radial immunodiffusion in 354 milk samples from uninfected and 98 samples from infected quarters from 42 Holstein-Friesian cows taken at 30, 150, and 270 days of lactation. -Lactalbumin and ß-lactoglobulin concentrations were not affected by quarter location. The -lactalbumin decreased at the end of lactation and in samples collected beyond second lactation. The ß-lactoglobulin concentration increased with stage of lactation. There was a positive correlation between -lactalbumin and ß lactoglobulin (r = .12).

Milk from uninfected quarters had mean -lactalbumin and ß-lactoglobulin concentrations of 1.47 and 4.6 mg/ml, respectively. Milk from quarters infected by major pathogens or Corynebacterium bovis had less -lactalbumin. Milk from quarters infected by minor pathogens had less ß-lactoglobulin.

There was a negative correlation between -lactalbumin concentration and somatic cell count (r = .31), which was amplified by infection status of quarters. No correlation was noted between somatic cell count and ß-lactoglobulin concentration when considered over the whole sampling period, but the correlation became negative in quarters infected by major pathogens.