Evaluation of the transfer of passive immunity by the analysis of immunoglobulin and serum proteins of Holstein calves Avaliação da transferência de imunidade passiva através da análise de imunoglobulinas e proteínas séricas em bezerras da raça holandês

This present study evaluated the serum concentrations of the fractional and total proteins, the immunoglobulin concentrations, and the dynamics of passive immune transfer in 25 female Holstein calves. All calves were maintained with their respective dams for 24 hours during which the ingestion of colostrum was done ad libitum. The determinations were done within 24 hours after suckling and at 30 days of age. The gamma fraction of proteins was the predominant immunoglobulin observed 24 hrs after the suckling of colostrum, followed by beta, alpha 2, and alpha1. 30 days later, the beta fraction was more elevated, followed by gamma, and the alpha fractions. The concentrations of serum albumin increased proportionally with age, but the concentrations of total proteins remained unaltered. Most calves (56%; 14/25) demonstrated effective passive immune transfer of immunoglobulins; transfer was within acceptable limits for 36% (9/25) but was inadequate in 8% (2/25) of the calves evaluated.