Age-related changes in the electrophoresis pattern of serum proteins in Korean indigenous calves

This study aimed to investigate changes in the serum protein profiles of healthy newborn Korean calves and provide a reference index for these changes during growth. The serum protein composition of 15 healthy bovine calves aged 1 week to 4 months was analyzed using electrophoresis. The albumin to globulin (A/G) ratio increased until calves reached 2 months (1.3 ±6 0.2) and then decreased until they reached 4 months (1.1 ±6 0.1). Albumin concentrations increased up to month 2 (3.4± 6 0.1) and decreased until month 4 (3.2± 6 0.2). a-1 globulin concentrations decreased up to week 4 (0.4 6 0.1) and then increased until month 2 (0.6± 6 0.1). g globulin decreased until month 2 (0.7 6 0.2) and then increased until month 4 (1.1± 6 0.3). These age-related changes in protein concentrations indicate the importance of considering age in calf blood tests. The g globulin concentration was at its highest in the first week, due to colostrum intake, and decreased to reach its lowest at 2 months, when passive maternal immunity is also at its lowest. Therefore, provision of sufficient passive immunity through the colostrum in neonatal calves might enable healthy growth.