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The objective of this study was to evaluate the effects of different colostrum supply on the serum immunoglobulin G (IgG) acquisition and the insulin-like growth factor-I (IGF-I), as well as the morphologic and morphometric modifications of the intestinal epithelium in the newborn calves. The prolonged supply of colostrum with different concentrations was used, including colostrum enriched with lyophilized colostrum, and was accompanied the fluctuation of serum IgG and total protein (TP) of calves in the first 72 hours of life, according to initial passive immunity acquisition. It was also studied the relation of IGF-I mass ingested with possible alterations in the intestinal morphology and enterocytes. Eighty two Holstein calves received at birth colostrum with different concentrations of IgG. Based on serum immunoglobulins evaluation at ten hour of life, the animals were distributed in two groups, serum IgG below or above 12 mg mL. Each group received three treatments in agreement with the meal supplied at 12 hours of life, low colostrum (IgG inferior to 30 mg mL), high colostrum (superior to 100 mg mL) or enriched with lyophilized colostrum (superior to 120 mg mL). At 0, 10-12, 24, 36, 48 and 72 hours of life blood was collected from calves for IgG, TP and IGF-I analysis, and samples from duodenum; proximal, middle and distal jejunum, and ileum for histomorphologic analysis. A completely randomized design was used with the serum variables analyzed as repeated measures on time. The morphometric variables of the intestinal segments were considered a factorial arrangement 3X3+1, corresponding to the total mass of IGF-I supplied in colostrum and the slaughter ages (10, 24-36 and 72 hours of life) plus the control group (birth). The prolonged supply of enriched colostrum in calves with high initial acquisition did not present significant effects on the serum IgG fluctuation. The ingestion of total solids above 150 g determined lower values of serum IgG. The animals with low initial acquisition showed better absorption efficiency of antibodies compared to high initial acquisition. The mass of IGF-I consumed did not influence the serum levels of this variable; however it influenced the behavior of the density of the ileum villi and the height of the microvillus from duodenum, proximal and middle jejunum. The values of the partial volume of the absorptive mucous membrane from birth to 10 hours of life presented significant differences. The prolonged supply of colostrum with high immunoglobulins and IGF-I concentrations influenced the morphology of the intestinal mucosa. Keyworks: Immunoglobulins; lyophilized Colostrum; Immunity Passive; Enterocytes; Villi; Morphometry, Morphology; Microscopy; Intestine

Efeito de IgG e IGF-I das primeiras refeições lácteas sobre a flutuação sérica e características do epitélio intestinal em bezerros recém-nascidos