Improvement of the ecological safety of milk and milk products in the technological zone of the Republic the North Ossetia - Alania

For many decades the mining enterprises situated in the Alagir region of the Republic North Ossetia - Alania have been extracting rock rich in zinc, lead and other metals. Heavy metals from rock were carried out with waters of melting snow and rainwaters and fell in the Ardon river. When ploughlands of the Alagir and Ardon regions of the Republic were irrigated with this water the soil became polluted with heavy metals as well as with nitrates because of the intensive usage of the nitrogen fertilizers for the agricultural purposes. As a result, surplus accumulation of the toxicants mentioned was found in the feeds and milk products manufactured in the regions. In order to improve ecological safety of milk and milk products produced in the technological zone of the Republic North Ossetia - Alania the experiment was carried out with lactating cows. The preparation adsorbent toxi-nil and vitamin C were added to the ration with surplus levels of zinc, lead, cadmium and nitrates. It was found that the most effective impacts on milk productivity, physical-chemical characteristics of milk and cream were obtained when these additives were applied together. Concentrations of the fat soluble vitamin A in the milk and cream of the experiment animals increased by 652°% and that of the ascorbic acid - by 48.5% at the simultaneous reduction of the heavy metals levels, nitrates and nitrites. The mass share of fat in milk increased by 027% and of protein - by 023% as compared with the results of the control group. In the course of the study when simultaneous addition of the preparations toxi-nil and vitamin C was used increase of the nitrate reductase activity of xanthine-oxidase in the milk and cream of the lactating cows of the second experimental group after homogenization was observed that promoted additional self-clarification of milk and milk products from nitrates and nitrites. As a result, ecological safety have also increased.

lactating cows, heavy metals, nitrates, vitamin C, toxinil, milk, milk products, dairy butter, denitrification