The article presents the dataset on the influence of paratypic factors on the productivity of Holstein cows. The best indicators of productivity were revealed in the cows with a live weight of 400-449 kg at the first successful conception. The milk yield amounted to 8863.2 with a fat mass fraction of 3.1% and a protein mass fraction of 4.5%. The animals calved for the first time at the age of 24-25 months showed the productivity of 8883.7 kg, which is 101.7 kg more than that showed by 22-23-mo-of-age cows and 628.5 kg less than the herd average. There is a positive correlation of 0.42 between the age at first calving and the mass fraction of fat. The analyzed 10% of livestock have a service period of less than 60 days, 24%-from 61 to 90 days, 26%-from 91 to 120 days.

Numerous studies have shown that sapropel is an effective source of macro-and microelements, as well as biologically active substances. There are about 3 million lakes on the territory of Russia, where sapropel reserves are estimated at 250 billion tons. There are 497 lakes on the territory of the Tyumen region, the estimated reserves of sapropel in them are 1398,7 million tons. The Tyumen region is a biogeochemical province for all normalized trace elements. Biologically active compounds obtained from natural raw materials, including normalized trace elements in organic form are the most promising and safe. Under the inviroments of the Tyumen region, such natural raw materials can be sapropels. The study of the effectiveness of the use of sapropels and their influence on the metabolism and milk productivity of cattle is an urgent topic. The purpose of the research was to study the influence of sapropel lake Nepryak on milk productivity indicators and the biochemical composition of the blood of cows. For the experiment 3 groups of cows have been formed (a control group and two experimental ones) based on the principle of pairs of analogs. Cows of the 1st experimental group have been got in the ration of 300 g of sapropel per head/day, 2nd experimental – 500 g/head/day. Cows of the control group did not receive sapropel in the ration. It has been found as the result of research that the use of sapropel lake Nepryak in feeding of cows in doses of 300 and 500 g/head/day had the positive influence on their milk productivity. At the same time, it is most effective to feed sapropel at the dose of 300 g/ head/day.

Unbalanced mineral and vitamin nutrition of lactating cows can be a critical factor in the realization of their productive potential. The development and introduction into production of inexpensive, but effective feed additives is the main trend of improving the feeding of modern animal husbandry. Under the conditions of the Tyumen region such natural raw materials can be sapropels, which successfully combine a variety of biologically active substances. The purpose of the research was to study the digestibility of nutrients and energy metabolism in lactating cows when sapropel is included in the ration. Scientifi c and economic experiment in the study of the effectiveness of feeding sapropel lake Nepryak has been carried out in the training and experimental farm of the State Northern Trans-Urals Agrarian University. The animals of the control group have been fed the main diet. Cows of the 1st and 2nd experimental groups have been fed 300 and 500 g of sapropel per head/day, respectively, in addition to the main ration. It has been found as a result of research that the introduction of sapropel into the ration of cows has a positive effect on the digestibility of nutrients. The digestibility coefficients were higher in the animals of the 1st and 2nd experimental groups compared with the cows of the control group. Cows from the experimental groups digested all the organic substances of the ration better. During the experiment period cows of the 1st and 2nd experimental groups in contrast to the control group had higher milk yield by 11,31 and 10,38 %, respectively, milk protein yield by 10,56 and 5,95 %, milk fat yield by 17,18 and 12,99 %. It has been established that the introduction of sapropel into the ration of cows has the positive effect on the digestibility of nutrients, contributes to the increase of milk productivity, normalizes the metabolism in the body.

Vitamins take signifi cant place among the factors of complete feeding of pigs, their lack in the diet causes metabolic disorders, reduced productivity. The purpose of this work was to provide a practical justifi cation of diets for rearing and fattening young pigs based on concentrate mixtures enriched with mineral and vitamin premix with an increased content of group B vitamins. The selection of animals in groups has been carried out taking into account live weight, origin and health status, per 10 animals in each group. Animals in the control group have been fed a basic diet and premix P-554-89 in the amount of 1,0 % of the daily weight of the grain mixture, to piglets of the experimental group to the main diet with the mineral and vitamin premix of 1,0 % of the weight of the grain mixture have been added. The eff ect of the mineral-vitamin premix with increased level of group B vitamins on the digestibility of nutrients and energy metabolism has been studied. The eff ectiveness of rearing and fattening young pigs on diets with a high content of group B vitamins (B1 , B2 , B3 , B5 , B6 , B12) has been proven. Inclusion of a premix with increased content of group B vitamins compared to the recipe P-55-4-89 in the amount of 1,0 % of the weight of the grain mixture increases the productivity of young animals on fattening. At 8 months of age piglets reached a live weight of 109,1 kg, which was 8,8 kg or 8,77 % more than in control animals. The use of this premix in the amount of 1,0 % of the weight of the grain mixture reduces the prime-cost by 7,01 %, and the profi tability of rearing fattening young animals increases by 9,20 %.

Modern agriculture needs new highly effi cient feed and feed additives. Sapropel is a type of finegrained and loose sediments rich in organic matter. The properties of sapropel and the sufficiently wide possibilities of its extraction make it an important natural resource that can be used mainly in agriculture. Sapropel and its processed products are environmentally safe, non-toxic, with a certain content of nutrients. Another important reason for studying sapropel is its widespread distribution and availability in freshwater reservoirs, which leads to the discovery of new ways of extraction and bioeconomically efficient use of this most valuable natural resource, available in economically significant amount with high opportunities for its use in animal husbandry. The purpose of the work was to analyze the use of sapropel as a source of nutrients in cattle feeding. In order to study the influence of sapropel on dairy productivity of cows, a scientifi c and economic experiment was carried out under the conditions of an educational and experimental farm of the Federal State Budgetary Educational Institution of Higher Education “Northern Trans-Ural State Agricultural University”. It was found as a result of the experiment that when using sapropel at the doses of 250 and 500 g/head/day, there was an increase in dairy productivity of cows. Thus, milk yield during the experiment period in the 1st experimental group increased by 1,48 % compared to the control group, and in the 2nd experimental group by 7,2 %, milk quality indicators also improved. Sapropel did not have a negative influence on the health of animals, which was confirmed by hematological indicators. Therefore, the use of sapropel in cattle feeding is effective.