Studies were conducted at the dairy complex of «Rus Ltd» (Perm Region). The effect of the use of vitamin-herb flour (VHF) from Rhaponticum carthamoides green mass in the feeding of holstinized black-and-white dairy cows was studied during the period of 12 days before calving and the first 30 days of lactation. The experiment was carried out according to the generally accepted method with the selection of analog pairs. The cows of the control group received a feeding ration consisting of feeds available at the dairy complex. For cows of the experimental groups, the composition of the concentrate part of the diet included VHF from leucea safflower in doses: the first group -4 % (0.4 kg of VHF per head per day), the second group – 10 % (1.0 kg of VHF per head per day). The experimental data of the experiment showed that VHF from leuzea as part of the concentrate part of the diet had a positive effect on the milk productivity of cows during the first 30 days of lactation, as well as on the bioconversion coefficients of protein and energy in the dairy products of cows. During the accounting period of the scientific and economic experiment (the first 30 days of lactation) from cows of the first and second experimental groups there has been obtained milk with natural fat content higher by 55.80±4.90 kg (8.04 %) (p<0.05) and by 99.20±5.80 kg (14.29 %) (p<0.05), respectively, compared to the control group. The gross yield of milk fat and protein for the reference period in cows of the first and second experimental groups was higher by 2.50±0.04 kg and 4.28±0.07 kg, by 2.54±0.16 kg and by 4.01±0.18 kg, respectively, compared with the control group. The cows of the first and second experimental groups had higher coefficients of protein bioconversion into dairy products by 2.98 % abs (p<0.05) and 3.97 % abs, respectively, compared to the control. The energy consumption for milk synthesis in the control group cows was reduced by 163.62 MJ and 349.18 MJ (p<0.05), respectively, in comparison with the cows of the first and second experimental groups, due to their lower consumption of the amount of feed mixture during the accounting period. The cows of the first and second experimental groups also had higher bioconversion coefficients of energy into milk by 2.14 % abs. and by 3.71 % abs. (p<0.05), respectively, compared to the cows of the control group. The cows of the experimental groups turned out to be more responsive to changes in the feeding diet and showed higher results according all the studied parameters.

The article presents the results of identifying the effect of feeding different doses of winter rye grain extrudate on the digestibility of diet feeds and the biochemical composition of rumen fluid and blood of replacement heifers. The research was carried out at the Sokolovo dairy complex (Perm Krai). The objects of the study were replacement heifers of Holstein blackand-white breed aged 12-15 months. The concentrate part in the diet of heifers of the experimental groups consisted from winter rye grain extrudate: in the first group by 12.5 %, in the second – by 25.0 %, in the third – by 50.0 %. As the result of the research, it was revealed that the replacement heifers of the first, second and third experimental groups showed great results compared to the heifers of the control group in the digestibility of the dry matter of the diet feed by 0.63 %, 0.99 and 1.77 % (p<0.01), respectively. The ammonia content was in the rumen fluid of the first experimental group of heifers three hours after feeding by 0.62 mg% (2.97 %) p<0.05, in the second experimental group by 1.22 mg% (4.77 %) p><0.05, in the third –> ˂ 0.05, in the second experimental group by 1.22 mg% (4.77 %) p˂0.05, in the third – by 1.70 mg% (9.42 %) p˂0.01 less, compared to the control. The level of urea in the blood of heifers of the experimental groups was lower, compared with the control, in the first ‒ by 0.34 mmol/l (by 6.65 %), in the second by 0.46 mmol/l (9.21 %) and in the third – by 0.58 mmol/l (14.90 %) p˂0.05.

The results of studies of the use of rhaponticum carthamoides for feeding dairy cows are presented. The experiment was carried out on Holstein cows of black-and-white breed in Perm Territory. Vitaminherbal fl our from green mass of rhaponticum carthamoides at a dose of 0.4 and 1.0 kg per head per day in the period of 10-16 days before calving and in the fi rst 30 days of lactation was introduced into the feeding rations of two experimental groups of cows. High sugar content in rhaponticum carthamoides (from 4.15 to 11.2% in dry matter and metabolic energy from 10.87 to 12.12 MJ/ kg) was noted. In the studied material from this plant, the content of the 20-hydroxyecdysone was 0.49% of active ingredients in the dry matter of the product at a rate of 0.25%. The introduction of rhaponticum carthamoides in the diet of feeding animals contributed to the increase in the intensity of metabolic processes in the body. A gradual increase in cholesterol levels in all experimental groups was noted. The most signifi cant growth was observed in cows of the second experimental group by 0.82 mmol / l or 29.50% (p <0.01). Compared with the fi rst experimental group, the increase was 0.13 mmol / l or 5.2%, and the control group – 0.36 mmol / l or 14.17%. Stimulation of metabolic processes in the body of cows of the experimental groups had a positive impact on reproduction, which was manifested in the reduction of the service period duration, compared with the control group.

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Abstract. The purpose of the research was to study the effect of feeding by sainfoin haylage in the dry period (21 days before calving) and in the period of early lactation (50 days after calving) on the metabolic processes of dairy cows and the results of reproduction. The article gives the brief description of sainfoin (Onobrychis arenaria Kit.) as a valuable feed protein crop that can be successfully cultivated in Perm region conditions. High sugar content in sainfoin forage was noted 4.86 %, which is 1.6 times higher compared with standard class 1 for legume haylage first class. Methods. Experiments for use of sainfoin haylage in feeding highly productive cows were conducted in 2018. Cows of the experimental groups received a diet including sainfoin haylage. Cows in the control group received 5 kg of poaceous grass hay as a fodder. The first experimental group got 50 % of forage dry matter as sainfoin haylage. The second experimental group received 100 % of forage dry matter as sainfoin haylage. Results. Hay replacing by equal dry matter amount of sainfoin haylage provided positive effect on immuno-biochemical parameters of cows blood. The protein content increased in the blood plasma of cows during the time of the experiment: in the second experimental group by 4.3 g/l (5.47 %, p < 0.01) and reached 82.80 g/l, in the first experimental group by 1.72 % (p < 0.05), in the control – by 2.28 % (p < 0.05). Feeding sainfoin haylage to cows had a positive effect on their reproductive functions. The service period for cows of the second experimental group was shorter by 8.1 days (9.28 %, p < 0.01) compared with the first experimental group and by 21 days (24.05 %, p < 0.05) shorter than in the control group. The scientific originality of the work is that for the first time the biochemical composition of sainfoin was studied thoroughly in Perm region and the results of sainfoin haylage feeding to animals were presented.