Abstract
Abstract The aim of this study was to evaluate the effect of weaning preconditioning and parenteral supplementation of minerals and vitamin on growth and plasma total antioxidant status (TAS), glucose, NEFA, and insulin concentrations, in calves at feedlot arrival. Sixty male Angus-cross calves were randomly assigned to 4 treatments (n=15/treatment). Treatments were arranged in a 2x2 factorial design; the main factors were mineral and vitamins supplementation (supplementation (S) vs no supplementation (NS)), and preconditioning (preconditioning (P) vs. not (NP)). Supplementation was applied subcutaneously on d -45, -26 and 0 and provided Cu, Mn, Se, Zn, and vitamins A and E (Adaptador Min-Vit ®, Biogénesis Bagó). Preconditioning consisted in a 26-day period between weaning and transportation at feedlot (d0) with the animals remaining in the same location. Blood samples were collected on d -26, 0 and 15. Animals were weighted on d-45, -26, 0, 8, 15 and 29. On d0 calves were load into a truck and drove for 5-hours to the feedlot. Data were analyzed using a mixed model as a 2x2 factorial, using repeated measurements. Body weight was greater on d 0, 8 15 and 29 group on groups NP, followed by S-P, and the lowest for NS-P (Triple interaction P < 0.01). Treatment did not affect (P ˃ 0.1) plasma insulin and glucose concentrations. There was a triple interaction (P < 0.08) for plasma TAS and NEFA concentration. Plasma TAS concentration was grater due to a decrease in its concentration for the S-P and NS-NP from d0 to d8, but not in the other treatments. Plasma NEFA concentration had the greater increase in the NP groups followed by S-NP on d0. In conclusion, 26-days precondition weaning decrease body weight compare with a traditional weaning. Mineral and vitamin supplementation in precondition weaning partially reduced that effect
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