Redução da suplementação de microminerais em dietas para cães em crescimento

Abstract

Due to its great relevance in the metabolism and body biochemical processes of dogs, minerals are necessary in adequate quantities, without lack or excess, and the source must also be considered, since this factor influences the availability of these nutrients. Thus, twenty-four puppy dogs, at 70 days of age, were studied for 150 days in order to evaluate the effects of inorganic versus organic sources and a supplementary decrease in copper (Cu), iron (Fe), manganese (Mn), selenium (Se) and organic zinc (Zn). The performance, metabolic parameters and the amount of mineral retained in the animals' body (mineral status) were analyzed through the quantification of minerals in the skin, gonads, hair and excretion in feces and urine. The control diet (100% ING) was supplemented with 11 mg Cu / kg (sulfate), 88 mg Fe / kg (sulfate), 5.6 mg Mn / kg (sulfate), 0.35 mg Se / kg (selenite) and 100 mg of Zn / kg, based on the recommendations of the National Research Council (NRC, 2006). Organic minerals were used as substitutes in the same mineral concentration (100% ORG) or in smaller quantities (70% ORG and 40% ORG). The dogs were distributed in a completely randomized design in four treatments with six repetitions each. No difference (p> 0.05) was found between the sources ING and ORG, at their different levels, for body weight; withers height; body length; fecal excretion of Fe, Mn, Se and Zn; absorption and concentration of Fe, Cu, Mn, Se and Zn in the gonads and hair; urinary excretion of Fe, Cu, Mn and Zn; Fe, Mn and Zn retention; concentration of Cu, Mn, Se and Zn in the skin; Fe, Cu and Se in plasma; activity of SOD enzymes, GSH-Px, plasma levels of malonic dialdehyde (MDA). A difference (p <0.05) was observed between the sources and in their different levels for the bone mineral density of the humerus, radius and ulna; Cu concentration in faeces; If in urine; Cu and Se retention; plasma Mn and Zn concentration. It is concluded that the reduction in the supplementation levels of the organic source did not affect the performance and the antioxidant activity. Supplementing up to 70% of the recommendation of Cu, Fe, Mn, Se and Zn, in organic form, is effective in maintaining mineral status, antioxidant defense and bone development, resulting in the maintenance of growth and metabolism of puppy dogs within normal.