In all types of cereals corn has the highest energy content; the chemical composition of corn is distinguished by high starch content up to 70 %. Cows are able to give high productivity when the rational use of this feed as part of the ration. The purpose of the work was to compare the nutritional content of wet flattened corn grain and the influence of feeding it as an additive to the main ration on the dairy productivity of cows. Two groups of dry cows-analogues have been formed for the experiment. Wet flattened corn grain has been fed to mature cows for 110 days, starting from the dry period (30 days before the expected calving) and during the beginning of lactation (starting from 15 days and for 60 days). High starch content has been found in the wet flattened corn grain – 58,5 %. The results of control milking after calving at the period of increasing the milk have been shown a sharp increase in daily milk yield in both groups: in the control group up to 21,97 and in the experimental group up to 29,37 kg of milk. The difference was 7,4 kg and was significant at P ≤ 0,001. After a month of productivity control, there was the increase in the average daily milk yield compared to the previous month by 2,33 kg in the control group and by 1,75 kg in the experimental group, amounting to 24,3 and 31,12 kg, respectively. The difference between the groups was 6,82 kg of milk and was significant at P ≤ 0,05. According to the results of feeding wet flattened corn grain as part of the ration to cows during the dry period and at the period of increasing the milk yield (for 60 days), then average of 1897,9 kg of milk per head has been obtained from cows of the experimental group, which was by 268,0 kg more than from analogues of the control group.

Primary changes in the physiological status of animals can be traced in the deviation from the norm of indicators of a number of substances in biological fl uids, since biochemical indicators are a kind of indicator of processes occurring in the body. Having knowledge of hematological changes in the body of cattle, managers and specialists of livestock farms can manage the productivity and health of highly productive animals. The purpose of the research was to determine and analyze the biochemical parameters of the blood of cows in the dry period and at the increasing the milk yield when wet crushed corn grain was introduced into their ration. The research has been carried out on cows of Black-and-White breed in LLC “Agrofi rma “Urozhai” in the Zonal district in the Altai Territory. During the research the prevalence of productivity indicators of cows of the experimental group over analogues from the control group was proved. Thus average daily milk yield for the accounting period (60 days) it was 30,9 kg, which was 5,2 kg more than the control herdmates (P > 0,95). The total productivity of one head was 1541,57 kg of milk in the control group and 1854,69 kg in the experimental group, which was 313,12 kg more (P > 0,95). It has been found that most of the studied biochemical parameters corresponded to the physiological norm. The exception was the increased content of total protein in the blood of lactating cows of the experimental group 5 g/l above the upper limit of the norm (P > 0,999). A low albumin content in the blood of animals of the experimental group has been noted, and this indicator was signifi cantly lower than that in the control group by 3,45 g/l (P > 0,99). An excess of the physiological norm of globulin in the blood of animals of both groups has been found, the indicators of the experimental group signifi cantly exceeded the control group by 9,5 g/l (P > 0,99). There was a low level of chlorides after the increasing the milk yield 88,1 mmol/l in the control group and 89,2 mmol/l in the experimental group, then excess of manganese after the increasing the milk yield was 4,50 mmol/l in the control group and 8,14 mmol/l in the experimental group, which could be associated with the increased content of this element in feed and soil.

The reproductive traits of sows are of paramount importance in the production of high-quality pork. The world experience of pig farming shows the need to solve first of all the feed problem. Diets unbalanced in the content of vitamins restrain the manifestation of genetically inherent high prolificacy of sows. The purpose of the research was to study the influence of feeding the vitamin feed additive “LipoCar” on the reproductive traits of sows and the biochemical parameters of blood serum. The results of research on the introduction of vitamin feed additive “LipoCar” into the diet of pregnant sows have been presented in the article. The experiment has been carried out in the production conditions in JSC “Linevsky pedigree farm” on sows of Large White breed. Pregnant sows have received a basic diet, balanced for all the normalized elements of nutrition. Sows of the experimental group in the composition of the basic diet fed the feed additive “LipoCar”. The dosage of the drug “Lipocar” was 2,1 g/head/day. “Lipocar” has been fed for 20 days. The total duration of the experiment was 3 months. When introducing the vitamin feed additive “LipoCar” into the main diet of sows in the second half of pregnancy the increase in the number of piglets in the litter by 1,6-6,8 % and the weight of the litter – by 5,6-56,2 % (P ≤ 0,001) have been revealed in comparison with the control group of animals. There was a higher content of carotene in the blood serum of sows of the experimental group by 50,0 % (P ≤ 0,01), vitamin A - by 48,7 % (P ≤ 0,05), and total protein – by 4,9 % (P ≤ 0,05).

It is known that one of the most important reasons for the birth of weak calves is the impact of adverse factors on the physiological status of the cow, which in turn affects the intrauterine and postnatal development of the fetus and newborn. The results of studying the introduction of different doses of tissue biostimulator to cows during the dry period and its effect on the development of the conformation of calves received from them have been presented in the article. The experiment was carried out in 2019 on cows of Priobsky type of Black-and-White breed and calves obtained from them. In order to conduct the experiment four groups of dry cows-analogs have been formed with 10 heads in each for 55–60 days before the expected calving at the age of III lactation and older. When selecting animals the live weight and milk productivity of cows for the previous lactation have been taken into account. The highest growth rate has been observed in calves from cows the 2nd experimental group, which exceeded the control by 24,4 % (P ≤ 0,001). The best indicators of conformation development have been also observed in calves obtained from cows of the 2nd experimental group, which were injected subcutaneously with 22,5 ml of tissue preparation. So, oblique body length have been greater by 12,6 % (P ≤ 0,001), chest girth by 17,3 % (P ≤ 0,001), width of hook bones by 21,0 % (P ≤ 0,01), the width of the pin bones by 15,0 % (P ≤ 0,05). The lengthiness index was by 11,5 % higher (P ≤ 0,001), the blockiness index was by 4,1 % higher (P ≤ 0,05), and the boniness index was by 10,6 % lower (P ≤ 0,05) than in the control group herdmates.

In order to effectively provide the body of cows with energy during the increasing the milk yield without the risk of acidosis, progressive animal breeders of the Altai Territory include wet flattened corn grain in the composition of concentrated feed. The question of the expediency and economic effectiveness of using wet flattened corn grain for cows of various physiological groups – first-calf heifers and mature animals continues to be debatable. Therefore, a comparative assessment of two options for feeding wet flattened corn grain to cows under the conditions of the Altai Territory is considered promising in modern animal husbandry and is of great practical interest. The purpose of the work was to identify the optimal and economically feasible option for using wet flattened corn grain in the rations of lactating cows. When using wet flattened corn grains in an amount of 7,1 % of the nutritional value of the ration the first-calf heifers during the period of increasing the milk yield, productivity has increased by 20,9 %. The average daily milk yield was 17,3 kg, which significantly exceeded the indicator of the control group (P > 0,95). The inclusion of wet flattened corn grains in the ration of mature cows in the amount of 1 kg for 30–35 days before calving, then 4,5 kg from 15 to 75 days after calving allows us to get the average daily milk yield of 30 kg or 20,3 % higher than that of the control group of herdmates (P > 0,95). The effectiveness of the use of wet flattened corn grain had significant indicators: the total profit from the sale of dairy products of the first-calf heifers of the experimental group amounted to 16 251,3 rubles/head, and from the sale of milk of mature cows of the experimental group it was 30 346,43 rubles/head.