[Metabolic evaluation of a polymer intravaginal device for the administration of calcium and magnesium in ruminants]
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ABSTRACT The aim of the study was to evaluate the availability of calcium (Ca2+) from two pharmaceutical forms (oral and intravaginal) and its effect on the metabolism of ruminants. The study was carried out at the experimental farm of the Federal University of Pelotas. Twenty-four lactating ewes were randomly divided into 4 groups: treatment device (TD); control device (DC); oral treatment (OT); and oral control (OC). Treated animals received calcium formate and magnesium chloride, evaluations were performed after administration of the treatments. Total calcium (CaT), magnesium (Mg), total plasma proteins (PPT), aspartate aminotransferase (AST), gamma glutamyl transpeptidase (GGT), urea, albumin and urinary pH, and clinical examination were performed on all animals. Serum CaT, CaI and Mg levels differed between the groups (P≤ 0.05), the animals in the DT and DC groups differed in the three evaluations, the DT group had the highest mean values, being significantly equal to the OT group. There was no difference in the serum concentrations of PPT, AST, GGT, Albumin, Urea and urinary pH. In conclusion, the blood availability of CaT, CaI and Mg is the same when administration of calcium and magnesium formate is intravaginal or orally, without altering other metabolic parameters evaluated.