Age-dependent presence of fetuin in bovine nasal secretion.

At least two age-dependent proteins were detected in nasal secretion (NS) of young calves by crossed immunoelectrophoresis. One of them was identified as fetuin. The other one was not identified. The concentration of fetuin in NS was found to increase in cases where a sample of NS had been obtained at birth and a second sample taken within 11 days. Thereafter a decrease was always found towards day 15 or 30.