Avaliação da transferência de imunidade passiva em bezerros da raça girolando

Abstract

This study aimed to analyze the transfer of passive immunity (TPI) in bovine neonates. For this we used 22 calves from primiparous cows, raised in semi extensive system belonging to the herd of Centro de Ciências Agrárias, Ambientais e Biológicas of Universidade Federal do Reconcâvo da Bahia. To determine the transfer of passive immunity in experimental group, blood samples were collected to obtain serum , by jugular venipuncture at the following time 48 hours after birth, 7, 15 , 30, 60 , 90, 120 , 150, 180 days . The samples were processed and total serum protein concentrations (mg / dl) Albumin (mg / dl) were determined by the colorimetric method and the globulin estimated by the difference between the two; serum activity of gamma glutamyl transferase (GGT - IU / L) was determined by a kinetic method, using commercial kit. In the experimental group the highest concentration of total serum protein was observed soon after birth, and noting from there a significant decrease in their values (p≤0.05) , to achieve the lowest concentration at 60 days of age , returning to rise up to 150 days , and similar behavior related to absorption of colostral immunoglobulins was observed for globulins, with the highest level at birth and minimum value at 60 days of age; there was a significant increase in albumin levels ( p = 0.05 ) , until 120 days of age ; as the GGT , the highest serum levels were observed as early as after birth and 60 days notice a significant decrease in this value ( p = 0.05 ), which reached 16.0 IU / L, considered normal for adult cattle. It constitutes , however fundamentally important more research to standardize a trackconsidered ideal evaluated parameters as there are many controversies regarding the minimum and maximum limits for each measured variable.