A toxic substance like chlorinated pesticides, micotoxin, heavy metals and veterinary medicines are almost omnipresent in environment. Thus, they are also in the resources for animals. Correct management depends on acquaintance of course of process adsorption, risk biotransformation and expelling of this substance and in provender materials practical methods of drops of values of these substances. Toxic substances are metabolized before or after adsorption by mucous membrane intestines. According from physico-chemical some of them are metabolized into nontoxic products. Generality most of the veterinary medicine and provender additions belongs to this group. Other substances are put inside in animal tissues as e.g. dioxins. The point of research was purpose of work about consequence of different presence of kind of chemical compounds (residues) contaminating plant material.

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