The role of iodine in calcium and phosphorus metabolism in cows

The purpose of the research was to study the effect of iodine implantation on the calcium and phosphorus balance in experimental animals. The tasks of the research were to determine calcium and phosphorus balance by conducting a physiological experiment. The experiment was carried out on 9 cows of the fourth lactation which were divided into three groups according to the principle of analogues. Animals of the first experimental group were administered iodine in the amount of 21 mg per head in the diet with concentrates in the form of tablets “Kayod”. Cows of the second group were injected with “Kayod” subcutaneously into the upper third part of the neck to a 3-4 cm from the incision, in an amount of 21 mg per head. The experience included preliminary and accounting periods. In the first period, animals were accustomed to the consumption of feeds and conditions of management. In the second period, the consumed feeds and their residues were taken into account, and a daily collection of urine and faeces was carried out. Milk accounting and average sampling were performed at each milking. At the end of the experiment, samples of feeds, their residues, faeces, urine and their milk were examined using generally accepted methods. Based on the research results, the coefficients of using calcium and phosphorus and their balance were calculated. The results of the studies show that the balance of calcium and phosphorus in animals of all experimental groups was positive. The coefficient of the calciumuse in animals of the implanted group significantly exceeded the coefficient of the calcium use in animals of the first experimental and control group by 4.8 and 7.3 % (P>0.95), respectively.The implanted animals had a higher coefficient of phosphorus use by 20.0 and 42.3 % in comparison with the first experimental and control groups, takingit with food. As the results of the studies showed, iodine administered by the method of a single subcutaneous implantation at a dose of 21 mg per head had a positive effect on the calcium and phosphorus metabolism.