Mineral feed additives in the rations of lactating cows

2020 ◽  
pp. 49-56
Author(s):  
S. Sukhanova ◽  
G. Uskov ◽  
T. Leshchuk ◽  
N. Pozdnyakova ◽  
V. Yaroslavtsev ◽  
...  
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Raw Materials ◽  
Animal Husbandry ◽  
Fat Content ◽  
Feed Additives ◽  
Control Group ◽  
New Mineral ◽  
Mineral Additives ◽  
Experimental Group

Scientists of the Kurgan State Agricultural Academy named after T. S. Maltsev conduct research on the development of diff erent feed additives and compound feeds, their use in feeding animals and poultry. It has been developed mineral additives, which used mineral components to meet the needs of macro- and microelements of cows during lactation. The purpose of the work was to solve the problem of lack of minerals in animal husbandry by preparing granular feed additives based on raw materials of domestic production, enriched with trace element salts. Feeding of experimental mineral additives positively aff ected the average daily milk yield already in the 1st month of lactation. Thus, in the 1st experimental group more milk has been obtained by 0.6 % and in the 2nd group by 1.9 % compared to the control one. In the 2nd month of lactation milk yield in the 1st experimental group was greater by 2.3 %, and in the 2nd experimental group – 4.0 % compared to the control group. The same trend has been observed in the following months: in the 3rd month of lactation the diff erence in milk yield compared to the control group was in the 1st experimental group 4.0 %, in the 2nd experimental group – 6.5 %, in the 4th month, respectively, 5.7 and 9.3 %. Milk yield for 120 days of lactation in cows of the control group was 2951.4 kg of milk (in terms of 4 % fat content) in the 1st experimental group more by 3.4 %, and in the 2nd experimental group by 6.2 %. The fat content in the milk of cows of the experimental groups was higher by 0.03 and 0.04 abs.%, and protein by 0.02 and 0.03 abs.%, respectively. In this regard, the sale price of 1 kg of milk has changed. In the control group it amounted to 21,48 rubles, in the 1st experimental group more by 0,7 %, and in the 2nd group by 1,0 %. This led to an increase in the profi tability of milk production: in the 1st experimental group by 4,5 %, and in the 2nd experimental group by 6,8 %. Consequently, the feeding of new mineral additives allowed to reduce the prime-cost of milk, increase milk productivity of cows and profi tability of milk production.

The effectiveness of use RUSMA additive in the rations of lactating cows

2020 ◽  
pp. 28-37
Author(s):  
S. Sukhanova ◽  
N. Pozdnyakova ◽  
F. Yaroslavtsev
Keyword(s):  
Milk Fat ◽  
Raw Materials ◽  
Fat Content ◽  
Feed Additives ◽  
Control Group ◽  
New Mineral ◽  
Milk Productivity ◽  
Black And White ◽  
Lactating Cows ◽  
Experimental Group

The results of researches on the development of new mineral feed additives based on raw materials produced by Uralchem and the study of the eff ectiveness of their use in the rations of lactating cows have been presented in the article. The experiment has been carried out in the conditions of LLC “PF Barabinskoe” in the Dalmatovsky area in the Kurgan region where 3 groups of lactating cows of Black-and-White breed have been formed. Animals in the control group have been received the ration adopted in the farm, the 1st experimental group with the additive RusMA No. 1 at a dose of 150 g, the 2nd experimental group– with the additive RusMA No. 2 at the dose of 350 g. The use of experimental mineral additives in feeding lactating cows allowed us to increase their milk productivity and profi tability of production. At the same time, the best eff ectiveness was shown by the additive RusMA No. 2 at the dose of 350 g/head/day. The use of RusMA additives during the experiment period (105 days) allowed to increase the milk productivity of cows in the 1st experimental group by 6,03 % and in the 2nd experimental group by 8,24 %. Taking into account the fat content in milk, this diff erence was 6,31 and 8,53 %, respectively. The energy value of milk from cows of the experimental groups was higher compared to the control group by 2,45 and 1,76 %, respectively. According to the content of dry matter in milk, cows of the 2nd experimental group exceeded the control and 1st experimental group by 0,39 and 0,12 abs.%, respectively. The maximum milk fat content has been observed in the milk of cows of the 1st experimental group by 0,03 and 0,01 abs.% more than in the control and 2nd experimental groups, respectively. In terms of protein content, the cows of the 2nd experimental group signifi cantly exceeded the control group by 0,10 abs.% and the 1st experimental by 0,04 abs.%. The content of milk sugar in the 2nd experimental group was higher than in the control by 0,30 abs.% and compared to the 1st experimental by 0,11 %. Signifi cantly more calcium and phosphorus were contained in the milk of cows of the 2nd experimental group by 4,58 % (Р ≤ 0,001) and 2,86 % (Р ≤ 0,05), compared with the control group. The expenditures of feed in the EFU for the production of 1 kg of milk in animals of the 2nd experimental group was less by 5,13 % than in control cows and by 2,63 % compared to the 1st experimental group. The prime cost of 1 centner of milk was lower in the 2nd experimental group by 3,94 %, in the 1st experimental group by 2,65 % compared to the control group. The level of profi tability of milk production in the 2nd experimental group was higher by 9,0 and 1,0 abs.% in comparison with the control and 1st experimental groups, respectively.

Zootechnical and economic evaluation of the use of energy additives in the rations of highly productive cows

2020 ◽  
pp. 20-26
Author(s):  
I. Mikolaychik ◽  
L. Morozova ◽  
N. Kostomakhin ◽  
E. Bulygina
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Ketone Bodies ◽  
Fat Content ◽  
Feed Additives ◽  
Feed Additive ◽  
Control Group ◽  
Black And White ◽  
White Breed ◽  
Experimental Group

In order to compensate for the lack of energy in the ration of lactating cows, optimize carbohydrate metabolism and maintain health, specialized feed additives are often used, which include components that make up for or stimulate metabolic processes during metabolism, which reduces the accumulation of ketone bodies. The researches have been carried out in CJSC Glinki in the Kurgan region (Russia). The cows of Black-and-White breed were as the object of research. The purpose of the research was to provide practical justifi cation for the use of modern energy additives in the rations of highly productive cows during the period of increasing the milk yield. It has been found in the course of the conducted research that the cows of the 1st experimental group received in addition to the main ration the energy feed additive Enermix plus in the amount of 250 g/head/day milk yield of natural fat content was highest and exceeded by 273,42 kg or 7,59 % (P < 0,05) of the control group’s herdmates. It has been found in terms of milk at 4 % fat content that for 100 days of lactation 3915,03 kg of milk has been received from cows of the 1st experimental group, which was by 332,55 kg or 9,28 % (P < 0,05) more than from analogues of the control group. At the same time, the yield of milk fat in the milk of cows of the 1st experimental group was 157,67 kg, which was more than the same indicator of cows of the control group by 14,88 kg or 10,42 % (P < 0,05). It has been found that additional feeding of highly productive cows of Black-and-White breed of energy feed additive of domestic production Enermix plus in the dose of 250 g/head/day increases the level of their milk productivity and has a positive infl uence on the composition of milk and economic indicators of production.

Effects of long-term administration of recombinant bovine somatotropin on milk production and plasma insulin-like growth factor and insulin in crossbred Holstein cows

2005 ◽  
Vol 143 (4) ◽  
pp. 311-318 ◽  
Author(s):  
N. CHAIYABUTR ◽  
S. THAMMACHAROEN ◽  
S. KOMOLVANICH ◽  
S. CHANPONGSANG
Keyword(s):  
Blood Flow ◽  
Milk Production ◽  
Milk Yield ◽  
Bovine Somatotropin ◽  
Control Group ◽  
Early Lactation ◽  
Recombinant Bovine Somatotropin ◽  
Igf I ◽  
Term Administration ◽  
Experimental Group

The objective of the study was to determine the in vivo relationship between the long-term administration of recombinant bovine somatotropin (rbST), circulating levels of IGF-I and insulin, mammary blood flow and other variables relevant to milk synthesis, in crossbred, Holstein cattle. Ten first-lactation, non-pregnant, crossbred, Holstein dairy cattle were divided into two groups of five animals each; an experimental group and a control group. Animals in each group were fed with rice straw, treated with 5 kg urea dissolved in 100 litres water per 100 kg dry rice straw as the source of roughage. Four consecutive study periods were carried out in each group. These consisted of a pretreatment period (45 days postpartum before lactation peak) and three treatment periods during early lactation (105 days postpartum), mid-lactation (165 days postpartum) and late lactation (225 days postpartum). During the treatment periods, animals that had completed 60 days of lactation were injected subcutaneously at fortnightly intervals with 500 mg of recombinant bovine somatotropin (rbST) (POSILAC, Monsanto, USA) in the experimental group, while animals in the control group were injected subcutaneously at fortnightly intervals with 800 mg of sterile sesame oil, without rbST, as a placebo. During the pretreatment period, there were no significant differences in plasma concentrations of IGF-I, insulin and other parameters between the control group and the experimental group. During the treatment periods, the increase in the concentration of plasma IGF-I in rbST treated animals was significantly higher than in the control animals throughout the lactation period. Plasma glucose, protein and triglyceride concentrations in each group remained stable throughout the study. The total daily dry matter intakes were not significantly different between the groups. Milk yield increased by 20% with rbST treatment and it was 22% greater than that of the control animals receiving placebo in early lactation. Milk yield of rbST treated animals rose to a peak in early lactation and then gradually declined. In late lactation, milk yield of rbST-treated animals decreased by 19% as compared with early lactation. Udder plasma flow and udder blood flow markedly increased with rbST treatment and there were no significant changes in the control animals. The ratio of udder blood flow to the rate of milk production increased in mid- and late lactation in controls and the rbST treated animals. These findings suggest that the short persistency of lactation in rbST treated animals was similar to that in the control animals receiving placebo. Changes in milk production during the progress of lactation in rbST treated animals might not be controlled systemically only but also locally within the mammary gland. The lack of effect of higher plasma IGF-I levels on persistency of lactation in rbST treated animals, may be due to changes in the pattern of IGF-I binding proteins and paracrine production inhibiting IGF-I action.

scholarly journals CHLORELLA SUSPENSION AND ITS USAGE IN FINISHING PIGS’ RATIONS

2019 ◽  
Vol 19 (1) ◽  
pp. 46-49 ◽  
Author(s):  
O. KARUNKYI ◽  
T. REZNIK ◽  
Ye KULIDZHANOV
Keyword(s):  
Chemical Composition ◽  
Live Weight ◽  
Animal Husbandry ◽  
Feed Additives ◽  
Farm Animals ◽  
Control Group ◽  
Finishing Pigs ◽  
Feed Conversion ◽  
Special Place ◽  
Experimental Group

The animal husbandry cannot develop successfully without complete balanced feed and optimal forage supply. This article deals with the chemical composition of chlorella suspension. The ration is balanced with seaweeds as well as premixes, vitamins and bio supplement for the last decades. These seaweeds include chlorella - a representative of green microscopic algae. The use of chlorella allows for multi-factor balancing of the diet in accordance with modern feeding standards, which increases the productive effect of feed and significantly increases the transformation of nutrients into livestock products. This is arelevant issue of modern animal husbandry. The chlorella suspension was material for scientific research. It was made on the farm “In Samvel”, Ovidiopol District. According to the result of researches that took place on the farm " In Samvel", Biliayevka District, Odessa Oblast and SERF "Yuzhnyi" OSAGES NAAS, new data concerning chemical composition, the positive influence of investigated chlorella suspension on the growth and development of finishing pigs as well as feed costs by 1 kg of growth were obtained. It has been established that the chemical composition of chlorella suspension takes a special place among all feed additives used in farm animals feeding. It has been established that the additional use of chlorella suspension in the ration of finishing pigs of Large White breeds contribute to the increase of average daily gains by 121.9% against the control group in which chlorella suspensions was not given. Feed conversion to obtain1 kg of pigs live weight gain in the control group was 5.1 kg, in the experimental group - 4.2 kg and feed conversion index in the experimental group was higher by 21.4%. Thus the results of researches indicate the positive effect of investigated chlorella suspension on the growth anddevelopment of finishing pigs. Due to the obtained results, we can state that the chemical composition of the suspension chlorella takes a special place among all feed additives used in farm animals feeding. Chlorella has higher indicators of chemical composition, the amount of protein, vitamins and minerals in comparison with plant fodder and crops of agricultural production.

Influence of feed additives on digestibility of nutrients and nitrogen metabolism in Kholmogorskaya breed of cows in Central Yakutia

2021 ◽  
pp. 51-57
Author(s):  
N. M. Kostomakhin ◽  
N. D. Ivanova
Keyword(s):  
Nitrogen Metabolism ◽  
Milk Yield ◽  
Feed Additives ◽  
Feed Additive ◽  
Control Group ◽  
Central Yakutia ◽  
Lactating Cows ◽  
Daily Milk Yield ◽  
Experimental Group ◽  
Daily Milk

The results of research on the use of the feed additive “Ecostimul-2” and natural zeolite from the Khonguruu deposit in the Suntarsky district of the Republic of Sakha (Yakutia) in the rations of lactating cows have been presented in the article. The purpose of the work was to study the influence of feed additives “Ecostimul-2” and zeolite on the digestibility of nutrients and nitrogen metabolism in lactating cows of Kholmogorskaya breed under the conditions of Central Yakutia. Chemical analysis of feed, accounting of dairy productivity of cows has been carried out according to generally accepted methods. The cows of the control group have received the main ration. The cows of the experimental groups have been additionally received to the main ration: the 1st experimental feed additive “Ecostimul-2” in the amount of 200 mg/head/day, and the 2nd experimental group – “Ecostimul-2” in the amount of 200 mg/head/day and zeolite 200 g/head/day. The inclusion in the ration of lactating cows of Kholmogorskaya breed under the conditions of Central Yakutia of feed additives “Ecostimul-2” and zeolite of the Suntarsky deposit together has increased the digestibility of feed in the ration and improved the digestibility of nutrients and nitrogen metabolism. It has been found during the experiment that in cows have been receiving the feed additive “Ecostimul-2” and zeolite with the main ration (the 2nd experimental group) the average daily milk yield was 9,06 kg with a fat content of 3,8 % or was by 10,4 % higher than in the control group. In cows that have been received feed additive “Ecostimul-2” (the 1st experimental group) the average daily milk yield was 8,76 kg with the fat content of 3,77 % or was by 6,8 % more than in the control group.

Increase the productivity of animals and poultry when use non-traditional feed and mineral additives

2021 ◽  
pp. 3-14
Author(s):  
N. A. Lushnikov ◽  
N. M. Kostomakhin
Keyword(s):  
Live Weight ◽  
Feed Additives ◽  
Feed Additive ◽  
Control Group ◽  
Beef Quality ◽  
Rapeseed Cake ◽  
Extractive Substances ◽  
Mineral Additive ◽  
Mineral Additives ◽  
Experimental Group

The possibilities of increasing the productivity of animals and poultry when using an additive containing selenium, rapeseed cake and a complex mineral additive have been studied. Adding to the feed of selenium-containing drug “Carasel” enhanced the digestibility of nutrients, increase of erythrocytes, hemoglobin in the blood, yield of certifi ed goslings, and profi tability. The digestibility of dry and organic matter has increased by 0,46–1,14 %, protein – up to 5,15 %. Depending on the dose of the additive the digestibility of raw fi ber, raw fat, and nitrogen-free extractive substances were higher. Certifi ed goslings have been received 19–22 % more. The inclusion of rapeseed cake of Siberian selection in compound feed when rearing goslings had a positive eff ect on the growth of live weight, the output of the gutted carcass. Goslings of the 1st experimental group exceeded the live weight of goslings of the control group by 3,4 %, and the 2nd experimental group by 6,1 %. The weight of the semi-gutted carcass was higher in the experimental groups receiving rapeseed presscake and rapeseed presscake in combination with rapeseed oil, and exceeded the weight of carcasses of the control group by 298,22 and 388,48 g (P ≤ 0,001), respectively. The weight of gutted carcasses was also significantly higher in the experimental groups. A complex mineral additive in the ration of steers of Hereford breed contributed to the increase in their live weight at the age of 15 months, slaughter yield, profitability of production and improvement of beef quality. The pre-slaughter weight of steers in the experimental group was 465,67 kg and was by 19,0 kg or 4,25 % more than that of steers in the control group (P ≤ 0,001). Studies have shown that the carcass weight was higher in the experimental group than in the control group by 12,09 kg or 4,39 % (P ≤ 0,001). The slaughter yield was 1,08 % higher. Economic evaluation of the use of feed additive in the experiment in the steers of Hereford breed has shown that the use of the developed mineral feed additives contributed to the increase in live weight of steers and the profi tability of production. The level of profitability in the group of steers experimental group receiving comprehensive mineral additive amounted to 13,80 % in comparison with the control group where it was equal to 9,40 %.

Influence of energy supply of diet of cows on dairy productivity and biochemical blood status

2021 ◽  
Vol 1 (3) ◽  
pp. 71-77
Author(s):  
A. V. Golovin ◽  
◽  
R. A. Rykov ◽  
Keyword(s):  
Milk Yield ◽  
Milk Fat ◽  
Dry Matter ◽  
Raw Materials ◽  
Fat Content ◽  
The Body ◽  
Metabolic Energy ◽  
Black And White ◽  
Feed Costs ◽  
Experimental Group

In a research and production experiment carried out in the milk farm of «Klenovo-Chegodaevo» (Moscow) on two groups of holsteinized black-and-white cows with a milk yield of 7000 kg of milk per lactation, 20 heads each, it was found that an increase in the concentration of metabolic energy (CME) in the dry matter of the cows ration from 10,7 to 11,0 MJ/kg in the period from 21 to 120 days of lactation, due to the inclusion of protected fat in the diet of cows in the experimental group, in the amount of 300 g/head/day, produced on the basis of vegetable raw materials, contributed to an increase in milk yield of 4% fat and milk fat yield by 9,5% (p<0,05) for 120 days of lactation, while reducing feed costs for its production, expressed in CME by 5,4%. More intensive milking of cows in the experimental group in the new calving period had a positive effect on the tendency to increase milk yield of standard (4%) fat content and the yield of milk fat in general for 305 days of lactation by 7,4% (p>0,05), compared with control. Calculations of economic efficiency have shown that the use of fractionated fat in the amount of 300 g in the ration of high-yielding cows during the milking period from 10,7 to 11,0 MJ/kg can reduce the cost of 1 quintal of milk of base fat content (3,4%) produced by cows from the experimental group for the first 120 days of lactation by 43,6 rubles. or by 1.9% while receiving additional profit from its sale in comparison with the control in the amount of 3502,5 rubles. for 1 head. Biochemical studies of the blood of cows in the experimental groups, carried out on the 120th day of lactation, revealed a tendency for a more intense course of protein and lipid metabolism in the body of cows was revealed, who received a diet with an increased to 11,0 MJ/kg level of CME in dry matter of the diet, due to the use of protected vegetable fat in an amount of 300 g.

Feed supplement based on endo- and exometabolites B. subtilis as stimulator of milk production of cows

2020 ◽  
pp. 19-22
Author(s):  
Sergey V. Malkov ◽  
◽  
Aleksandr S. Krasnoperov ◽  
Antonina P. Poryvaeva ◽  
Natalya A. Vereshchak ◽  
...  
Keyword(s):  
Bacillus Subtilis ◽  
Protein Content ◽  
Milk Production ◽  
Blood Parameters ◽  
Feed Additives ◽  
The Body ◽  
Control Group ◽  
Physiological Status ◽  
Milk Productivity ◽  
Experimental Group

Promising direction in ensuring food security and independence of Russia is the widespread use and study of new feed additives of probiotic action. Today, probiotic preparations are widely used in dairy farming. They support the positive microbial balance of the gastrointestinal tract and stimulate the activity of the digestive, motor-evacuation, hormonal and immune systems. Authors studied the efficiency of the composition of 2 strains of Bacillus subtilis during 14 days after calving (1 experimental group) and 14 days before calving and 14 days after calving (2 experimental group) in the technology of milk production and improving its quality. In the process of conducting scientific and industrial experience, modern research methods were used that were able to obtain high-quality and most informative data on the processes occurring in the body. Analysis of the results of hematological blood parameters of animals of all groups confirmed the physiological of recovery of the cow's body in the postpartum period, but with different degrees of intensity. Animals of the experimental groups reached peak milk production. By the end of the third month in group 1, milk productivity was 28.94±6.84 kg, in group 2 - 32.17±3.33 kg, which formed an increase of 6.44% and 15.59% relative to the background values. In the control group of cows-27.90±7.25 kg. By day 150, the average daily milk yield in animals of the first group was 25.07 ± 4.38 kg, the second - 25.33 ± 2.52 kg, control 22.75 ± 8.82 kg. Milk quality indicators - fat and protein content in animals receiving probiotic supplements were variable. In the milk of animals of the 1st and 2nd groups, the average fat content was recorded 3.69 g / 100g and 3.74 g / 100g, respectively, and the average protein content was 3.104 g / 100 g and 3.240 g / 100 g. In peers of the control group, the fat and protein content in milk was determined to be 3.79 g / 100 g and 3.016 g / 100 g. The studies established and proved the promise of the widespread introduction of probiotic in dairy cattle breeding, which was based on the composition of endo- and exometabolites of 2 strains of Bacillus subtilis. There was an improvement in the physiological status and an increase in the milk productivity of Holstein cows of the black-motley breed.

Implementation of non-traditional feed additives in cattle breeding of Yakutia

2020 ◽  
pp. 19-24
Author(s):  
N. Chernogradskaya ◽  
M. Grigorev ◽  
A. Grigoreva ◽  
A. Kyundyaytseva ◽  
A. Shadrin ◽  
...  
Keyword(s):  
Milk Yield ◽  
Feed Additives ◽  
Control Group ◽  
Production Test ◽  
Economic Experiments ◽  
Significant Difference ◽  
Production Experiment ◽  
The Difference ◽  
The Republic ◽  
Experimental Group

The results of research and production experiment on the use of local non-traditional feed additives in the feeding of Simmental first-calf heifers in the Republic of Sakha (Yakutia) have been presented in the article. A series of scientific and economic experiments have already been conducted to determine the norms for including local non-traditional feed additives in the rations of cattle, but they The results of research and production experiment on the use of local non-traditional feed additives in the feeding of Simmental first-calf heifers in the Republic of Sakha (Yakutia) have been presented in the article. A series of scientific and economic experiments have already been conducted to determine the norms for including local non-traditional feed additives in the rations of cattle, but they were not sufficient for the rational use of these feed additives. In order to determine the effectiveness of the use of local feed additives a scientific and economic experiment has been carried out under the environments of the APC “Krestyakh” in the Suntarsky district. Two groups of first-calf heifers have been selected per 50 heads in each. The groups have been formed by using the method of analogues. The environments of housing in all groups have been the same. The difference was that the experimental group of first-calf heifers have received from the local unconventional feed additives (zeolite khongurin, sapropel and Kempendyaskay salt). The results of the production test have shown that the experimental group of first-calf heifers exceeded the control group’s analogues in terms of milk yield by 233,4 kg or 9,4 %. Experimental group of first-calf heifers has had more high content of fat in milk 0,17 abs.%. When recalculating the content of fat in milk for 4 %, the difference in gross milk yield between the groups was 16,73 t or 14,3 % in favor of the experimental group. Economic analysis of the results of research and production experiment has shown that there was a significant difference in profit between the groups. So, in the control group it was 462 247,46 rubles, and in the experimental group 528 444,43 rubles. Additional profit in the experimental group was equal to 66 196,97 rubles, while the level of profitability was 8,2 %. Thus, the results of the research have shown that first-calf heifers of Simmental breed that received local non-traditional feed additives had higher milk productivity.

Effectiveness of milk production when using by cows mineral and energy complex Reactor

2020 ◽  
pp. 23-34
Author(s):  
O. Korshunova ◽  
L. Smirnova
Keyword(s):  
Milk Production ◽  
Milk Yield ◽  
Physiological State ◽  
Live Weight ◽  
Economic Feasibility ◽  
Feed Additive ◽  
Control Group ◽  
Energy Complex ◽  
Vologda Region ◽  
Experimental Group

The Vologda region is an area of developed dairy cattle breeding and the organization of comlete-fledged feeding of highly productive cows requires a special approach due to difficult soil and climatic conditions, which causes an insufficient balance of feed and rations. This paper has been solving the problem that is important for the region. The purpose of this work was to study the effectiveness of milk production with the use of the mineral and energy complex Reactor in feeding of cows. Researches on the effectiveness of using the feed additive Reactor have been carried out in the APC “Verny” in the Ustyuzhensky district in the Vologda region. In order to implement the set tasks 4 groups of cows of Black-and-White breed have been formed based on the principle of pairs-analogues, taking into account their age (2,4 lactation), live weight (540 kg), milk yield for 305 days of the last lactation (6250 kg) and physiological state. Cows of all groups have been received the main ration, but the animals of the 1st experimental group in the fresh period and the cows of the 2nd and 3rd experimental groups in the transit period have been additionally fed the mineral and energy complex Reactor. As the result of researches, new data on the zootechnical and economic feasibility of using this feed additive in the feeding of cows with the milk yield of 6000–7000 kg per lactation have been obtained, which allows identifying additional reserves for increasing milk yield with rational use of feed resources. The level of profitability of milk production for the period of increasing the milk yield in the control group was 10,4 %, and in the experimental group – 15,0; 16,8 and 20,7 %, respectively, i.e. there is the increase in this indicator by 1,5–2 times if the feed additive Reactor is used before and after calving.

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