Parâmetros sanguíneos de ovinos desafiados dieteticamente e suplementados com tamponantes

Abstract

The study aimed to compare the effects of the supply of two distinct commercial products, with buffering action: Equalizer® (Cargill®) and LithoNutri (Oceana Minerals®), on feeding behavior, metabolism of confined sheep and under high concentrate dietary challenge. . The study was approved by the Animal Ethics and Experimentation Committee of the Federal University of Pelotas, under code 009653/2021-45. Thus, 18 ewe (twelve non-cannulated animals and six cannulated animals) were randomly assigned to three groups, in a Latin square statistical block containing two treatments and a control group: Control (BICARB; n=6), Lithothamnium Calcareum® (LITHO; n=6) and Equalizer® (EQUA; n=6), which received a dose of 7.56g/ewe/day, provided over the TMR. The experiment was divided into three cycles of twenty-seven days each. Blood, feces and rumen fluid samples were collected at intervals of seven days and during the five days of nutritional challenge, as well as the zootechnical evaluation, being evaluated six collections per cycle, three during the pre-challenge period and three during the challenge. Hemogasometric analyzes of venous blood, collected from the jugular vein, were performed immediately after the morning meal. Blood metabolic indicators such as glucose, albumin, total plasma proteins (PPT), urea, calcium (Ca), magnesium (Mg), paraoxonase (PON), non-esterified fatty acids (NEFA) and β-hydroxybutyrate (BHB) were analyzed using collection of blood from the jugular vein using the Vacutainer system. The results obtained for all parameters evaluated showed that there were no differences between the groups in the different cycles, including the challenge period. We concluded that the different buffers used in this study were effective in the ruminal buffering of the animals, maintaining the levels of blood gas and plasma parameters at acceptable physiological levels, with no changes that could indicate acidosis or metabolic changes under the conditions evaluated.