The ion-exchange properties of the enterosorbent prepared on the basis of a modified concentrate (50%) of glauconite from the Bondar deposit were studied under conditions of passage of calves through the gastrointestinal tract.Chemical modification of the mineral was carried out by transfer to the Na-form.Experienced calves daily for 6 and 9 days fed enterosorbent in the amount of 0.2 g/kg body weight. The character of excretion with excrement of metal ions accumulated on the active surface of glauconite was studied. The results of the assessment of its sorption capacity in relation to Ni (toxicant), Cu (micronutrient) and Ca (macronutrient) are presented.The sorbent showed high efficiency against nickel - up to 60% of the total amount is excreted from animals. With respect to copper, average efficiency (13%). The sorbent accumulates in the digestive tract of animals for 3-4 days.Under the conditions of copper deficiency in the ration feed, this contributes to its better assimilation from inorganic forms. Feeding animals with an enterosorbent at the indicated dose does not affect the excretion of calcium from their bodies.

No abstract

Natural mineral glauconite, which is extracted in the Bondarsky district in the Tambov region, has a high adsorption capacity. The study of its properties as an enterosorbent in the conditions of passage through the gastrointestinal tract of calves was executed. Chemical modification of the mineral was carried out by converting to Na-form. As a result of treatment, the number of bacteria in it decreased 10 times, and the number of molds decreased 3 times. The prepared enterosorbent was fed to 2 and 6-month-old calves once and for 6 and 9 days daily in the amount of 0.2 g/kg of live weight. The content of metals in the mineral, feed and excrement was determined by x-ray fluorescence analysis. According to the results of one-time feeding of enterosorbent to the calf during the milk growing period, a significant sorption effect was observed with respect to copper (13.6%), nickel (52.7%) and lead (93.8%). The use of enterosorbent in the diets of 6-month-old calves contributed to an increase in the excretion of lead from the body of animals up to 36% of the total amount, which on average is excreted with feces.