PSXII-7 Influence of energy in the diet of buffalo heifers (Bubalus bubalis) on the metabolic energy and mineral profile.

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Care in the growth phase is very important to ensure the longevity of the animal in the productive system, especially in highly intensified management. Therefore, the objective was to evaluate the energetic and mineral metabolic profile in buffalo heifers receiving diets with different concentrations of energy. Twenty buffalo heifers of the Murrah breed, aged six to eight months, were distributed in four treatments with levels of 20, 40, 60 and 80 % of energy in the diet. The experiment lasted 129 days (45 adaptation and 84 experiment). To evaluate the metabolic profiles, four blood samples were collected at 21 days intervals. Posteriorly, biomarkers for the energy profile (glucose, lactate, fructosamine, total cholesterol, HDL cholesterol and triglycerides) and mineral profile (total calcium, ionic calcium, phosphorus, magnesium, sodium, potassium and chlorine) were analyzed. The data were submitted to analysis of variance and regression by GLM procedure of SAS (2000), considering 5 % of significance. In the energetic profile, a positive linear effect was observed for total cholesterol and HDL cholesterol and quadratic effect for plasma glucose, with the increase of energy in the diet. The mean values presented were 1.43 mmol/L for total cholesterol, 0.79 mmol/L for HDL cholesterol and 1.82 mmol/L for plasma glucose. In the mineral profile, a quadratic effect was observed for total and ionic calcium (Ca) levels, positive linear effect for phosphorus (P) levels and negative linear effect for chlorine (Cl) levels. However, the mean values presented were 2.16; 1.48; 2.43 and 85.96 mmol/L for total Ca, ionic Ca, P and Cl, respectively. We conclude that diets with high energy levels for buffalo heifers do not cause alterations in energy and mineral metabolism, that could impair sanity and productivity. This proves that buffaloes have a good ability to metabolize dietary nutrients, allowing them to maintain productive functions. Key Words:

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.