EFFECT OF FEEDING WITH <i>RHAPONTICUM CARTHMOIDES</i> ON MINERAL METABOLISM IN LACTATING COWS
The article describes the results of research on calcium and phosphorus metabolism in cows of the Black-and-White Holsteinized breed in the period of 11 days before the expected calving and 30 days after it. Scientific and economic experiment was carried out in “Rus” agro-holding of Perm Krai. The diets of animals from experimental groups included grass vitamin meal made from Rhaponticum Carthamoides (Rhaponticum). Animals of experimental groups I and II consumed calcium by 5.8 - 12.8 g or 4.68 - 10.32% and phosphorus by 1.7 - 3.5 g or 3.37 - 6.94% more than the control group. The use of ingested and digested calcium in cows of experimental group II was by 2.49 - 4.82% higher than in the control group, and by 4.44% - 7.97% higher than in experimental group I, respectively. The largest amount of calcium and phosphorus deposits was observed in animals of experimental group II. This is shown in digestibility coefficients of calcium and phosphorus, which were higher in experimental group II by 2.37% - 3.62% compared with experimental group I and by 1.12 % - 5.82% compared with the control group.