Modeling of the intake of cadmium, lead, mercury and arsenic into the body of ruminants with a ration and the transition to animal products

The task of establishing the regularities of accumulation and transition to animal products of heavy metals for the development of scientifically based standards for the content of heavy metals in feeding diets is urgent. Based on modeling the effects of cadmium on the body of ruminants, in order to normalize the intake of heavy metals: Cd, Pb, Hg and As with the diet, accumulation in the body, and transition to livestock products, a simulation model for cattle and sheep has been developed. A conceptual scheme is presented that reflects the structure and functioning of the model. Its description is given. To calculate the maximum permissible levels of cadmium, lead, mercury and arsenic in the diet of cattle and sheep, a list of input parameters has been established. The studied indicator is the maximum permissible level of Cd, Pb, Hg and As content in feeding diets, the excess of which, it is expected, will lead to a violation of heavy metals standards in animal products (milk and meat). The model has been verified. The degree of similarity of empirical data and modeling results indicates the legitimacy of using the model and the conclusions drawn with its help are applicable to the real system under study and can be considered correct and reliable at an acceptable level. The implementation of the model, the establishment of the values of the maximum permissible levels of cadmium, lead, mercury and arsenic in the diets of animals, depending on the species, age group, physiological state, productivity level and other factors will allow to make changes and improve the technology of keeping and feeding in the conditions of the current technogenic situation and guarantee the receipt of environmentally safe livestock products.