INFLUÊNCIA DA CONCENTRAÇÃO SÉRICA DE IgG E DIFERENTES PROTOCOLOS DE ALEITAMENTO NO GANHO DE PESO DE BEZERRAS HOLANDESAS NO PRIMEIRO ANO DE VIDA

Aiming the evaluation of the influence of IgG serum concentration in the weight gain of heifers, during suckling and after their first year of life, 45 Holstein heifers were distributed in three collective stalls, equipped with automatic feeders, where they were submitted to three different suckling protocols (experimental treatments) called 4L, with a daily provision of four liters of milk replacer; 6L, with six liters; and AL, with ad libitum provision. The heifers entered the experiment on their fifth day of life with IgG concentration ranging between 13.4 and 43.7 mg /dL. The heifers’ weight was measured weekly. After weaning, the heifers were managed under the same conditions until they were one year old. At this stage, the measurement of the body weight was taken monthly. It was used a completely randomized design, Pearson’s linear correlation, analysis of ANOVA variance, Tukey’s test and a paired t-test at 5%. There was no influence of IgG in the weight gain at weaning or after one year, between treatments and disregarding the treatments