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The article raises questions about development of organic food market in Russia. One of the options for obtaining organic livestock products by using  silicon-containing natural minerals as feed additives is proposed. The main carrier in the supplement is a highly activated natural zeolite, the filler is an amino  acid complex of animal origin, the supplement is a 100 % natural product. The work was carried out in Ulyanovsk region at OOO “Agrofirma Tetyushskoye”  on dairy cows of the black-and-white breed. There were two groups, 10 cows in each were selected: according to live weight, age, productivity, physiological  state. The first group (control) received only the ration accepted on the farm. As for the second group (experimental), a silicon-containing additive based on  modified zeolite enriched with amino acids was included in the ration once a day at a dose of 250 g per cow. All the animals were kept in the same conditions,  there was stable housing. In the course of the experiment, improvement of morphological composition of cows’ blood and nitrogen metabolism parametres  was revealed when an additive based on highly activated zeolite enriched with amino acids was introduced into the ration. The additive promoted an increase  of: erythrocytes by 14.38 %, hemoglobin - by 12.17 % (p &lt;0.05), leukocytes - by 20.44 % (p &lt;0.01); total protein - by 11.84 %, albumin - by 11.11%, globulins - by  12.24 %; decrease of urea by 22.22 and ALT activity by 8.0%. In general, the parametres show protein metabolism intensification and effective usage of feed  nitrogen for synthesis processes in the body, including milk synthesis.

PHYSIOLOGICAL AND BIOCHEMICAL STATUS OF COWS IN CASE OF INTRODUCTION OF A SILICON-CONTAINING SUPPLEMENT INTO THEIR RATION