The paper presents the results of measurements of vibration parameters of the threshing drum mechanism of a combine harvester ACROS under operating conditions. The results of a multifactorial experiment allowed to determine the significance of the influence of radial clearance in the shaft bearing, the size of the drum imbalance, the tension of the variator drive unit and the rotational speed of the mechanism on vibrations with determining the optimal point of installation of a vibration sensor D-14 on the body of the bearing support to register measurement of amplitude-frequency characteristics through the developed prototype of the control and diagnostic device.
The article describes the design and operation of an experimental grain seeder equipped with roller seeding units with truncated rubber cones on the valves. Moreover, graphical and experimental dependences of the uneven distribution of seeds along the length of the furrow during the sowing of winter wheat Clavdia 2 on the speed of rotation of the roller, the diameter of the upper part of the spike and the angle of inclination of the spikes of the experimental seeding unit with truncated rubber cones on the valve are presented. The work on studying the influence of the seeding unit designs was carried out by comparing the basic seeder SZ-5,4 with an experimental seeder equipped with new roller seeding units with truncated rubber cones on the valves. The results of the research showed that an experimental seeder with roller seeding units with truncated rubber cones on the valves steadily performs the process of sowing seeds of winter wheat Clavdia 2 in compliance with all necessary agrotechnical requirements. With the improvement of sowing quality indicators, there is a decrease in the instability of the overall seeding rate, the uneven distribution of seeds along the length of the furrow, damage to the seed material, which, in turn, leads to an increase in the yield of the cultivated crop.
The productive and breeding abilities of animals are largely determined by their origins. Sires, especially those belonging to the leading lines of the Holstein breed, have a great impact on the cow production in dairy cattle breeding. According to the purpose of work, the article present data of a comparative assesment of the Holsteins breed's cow productivity of milk of different sires' daughters of Wis Burke Ideal 1013415 line. The research was conducted under the conditions of intensive technology of a modern dairy complex with a cow population of more than 13 ths. animals, total production of 175 ths. tons and milk yield per cow of 11900 kg of milk. The results of the research prove the valuable breeding abilities of the sires, which are confirmed by the high milk productivity of their daughters. In two completed lactations the milk yield of the daughters (n = 510) of four sires averaged from 8964.1 kg to 10171.5 kg of milk. The mass fraction of fat in milk ranged from 3.59 to 3.84 % and the mass fraction of protein – from 3.12 to 3.18 %. When comparing daughters of different bulls in terms of milk production, there is a reliable difference in individual key indicators for a full lactation and 305 days of lactation. Concerning the lactation period, there are differences in the sires' daughters productivity: all daughters of the Wis Burke Ideal 1013415 bulls are characterized by high productivity qualities. The dairy output level indicates purposeful breeding and selection work with the herd.
