Suplementação com cromo para equinos Mangalarga Marchador em treinamento para provas de marcha

Abstract

This experiment had the aim of identifying possible benefits of Chromium (Cr) supplementation on Mangalarga Marchador equine´s diet submitted to training for marcha tests and evaluates the animals dry matter intake when kept in pasture. The benefits focused in this research were the action of Cr on better uptake of glucose and consequent less utilization of anaerobic glucolitic pathway to avail the fuel store and stimulus of the immune system. 12 mares were divided in three treatments, characterized by the supply of 0, 5 and 10 mg de Cr. The experiment had two phases, of 24 and six days, respectively. The first one for adaptation of the animal and the second one to execute three marcha tests of 50 minutes, every other day. Blood samples were collected before and after the test to analyze lactate, glucose triglycerides, cortisol and insulin, total number of leucocytes, total protein and hematocrit. A completely (randomized design was used, in split-plot arrangement, with four repetitions and with the competition of a variable (temperature in the hour at the test moment). For food consumption, the analysis was performed using a completely random design with five replications and three treatments.The mean results were submitted to variance analysis and compared by t test Student (P<0.05). For evaluation times were made adjustment of regression model. There were not significant differences between Cr dose, day and schedule of tests for all analyzed parameters, but the values of total protein, blood volume and total white blood cells were higher after the marcha tests. Chromium has not influenced total serum protein, hematocrit and total white blood cells of MM mares in training.The results observed that dry matter intake of pasture animals was in agreement with NRC requirements.