Experience of individual correction of elemental status of cows with reproductive disorder

Abstract

The purpose of the study was to apply the method of individual correction of elementosis to increase the reproductive qualities of white-faced cows. The deficit of iodine and selenium in wool (I <0.28 mg/kg, Se <0.58 mg/kg) and low reproductive abilities (more than 2 months without estrous period) served the selection criterion of animals. The animals were divided by analogs into 2 groups – control (n=15) and experimental (n=15). On the 1st and 10th day the experimental animals were subjected to intramuscular injection of commercial formulations (10 ml) containing in 1 ml: iodine – 5.5-7.5 mg, selenium in organic form - 0.07-0.09 mg (corresponds to 0.16-0.20 mg of sodium selenite. It is found that the cows of the experimental group were characterized by the increase of I and Se content on the 28th day, which fell within permissible values (25-75 percentile), while the concentration of Ca, K, Mg, Na, Zn, Al, Sr, Pb, Hg decreased in relation to the beginning of the experiment. The assessment of reproductive qualities of cows showed that in the first month of the experiment 46.7% of cows came in season in the control group and 60.0% – in the experimental group. Within the next month the control group saw additional 20.0%, while the experimental group – 33.3%. During the first service of breeding 66.7% of cows were bred in the control group, 80.0% – in the experimental group. In the control group two cows were aborted, which reduced the number of living calves in the control group to 7 or 47%. The experimental group gave 14 calves or 93%.