EFEITO DA TRANSFERÊNCIA DE IMUNIDADE PASSIVA NO GANHO DE PESO E DESMAMA DE BEZERRAS LEITEIRAS

Abstract

The dairy calves breeding of quality is a important factor to the sucess of dairy farms, thereunto, become essential the accompaniment of many factors, among them, the passive transfer of immunity and the performance of calves. The study object was evaluate the effect of passive transfer of immunity in weight gain and weaning of dairy calves. The calves consumed colostrum in the quantity of 10% of bith weight on first feed and 5% of birth weight on second feed, and three weight measurements until weaning, being the first from 43 at 50 days of life, the second from 58 at 65 days of life and the third from 66 at 75 days of life. The animals diets until the gradual weaning period were composed of six liters of milk per day, concentrate with 18% of PB and water ad libitum. Was used the experimental period of 136 days. The variance analysis of completely randomized design was used upon the collected data of thirty dairy calves. For the obtainment of descriptives statistics, the procedure PROC UNIVARIATE of statistic software SAS STUDIO (2021) was used. For the variance analylisis of unbalanced data (ANOVA), the procedure PROC GLM of SAS STUDIO (2021) was used. To obtain the difference between the averages of treatments, the Tukey test was used. All the statistics analysis, was used at 5% of probability. To verify the association between the seric brix classifications (excelent, good and poor) with animals weaning, non parametric statistics was used, the test of Independence of Chi-Square was used at 5% of probability, through the procedure PROC FREQ of SAS STUDIO (2021). The passive transfer of immunity contributes to the weight gain and weaning of dairy calves.