Vestnik of Ulyanovsk state agricultural academy最新文献

{"title":"INFLUENCE OF MINERAL COMPOSITION OF SELECTIVE MEDIUM ON FLAX MORPHOGENESIS IN IN VITRO CULTURE","authors":"N. V. Proletova","doi":"10.18286/1816-4501-2022-2-87-93","DOIUrl":"https://doi.org/10.18286/1816-4501-2022-2-87-93","url":null,"abstract":"The studies were carried out on the basis of the laboratory of breeding technologies of Federal State Budgetary Scientific Institution \"Federal Scientific Center of Bast Crops\" (Tver region) in 2016, 2018, 2021. The purpose of the research is to determine appropriate mineral composition of the selective medium for effective in vitro selection for resistance to anthracnose. Various mineral composition media were studied. It was found that it is possible to use nutrient media Gamborg, MS, SH-2, which do not contain vitamins, chelate complex and phytohormones, in order to obtain cultural filtrates of fungus strains - the causative agent of flax anthracnose. The culture filtrates obtained on the basis of these media were highly toxic and it was possible to use them for in vitro selection. It was noted that the callus formed on the basis of hypocotyl segments had a higher ability for morphogenesis compared to the callus formed on the basis of immature embryos. As for selective medium consisting of mineral salts of Gamborg medium and cultural filtrate, the proportion of formed morphogenic callus was the smallest in all genotypes taken in the study and amounted to 0.1–6.8%. Mineral composition of the selective medium and the morphogenetic potential of the genotype influenced the formation of morphogenic callus based on primary callus. Depending on the genotype, the proportion of morphogenic calli formed on Gamborg medium + CF was 0.1 - 2.2%, on MS medium + CF - 3.3 - 8.0%, on Sh-2 medium + CF - 3.4 – 8.1%, respectively. Mineral composition of the selective medium had no significant effect on formation of morphogenic cells based on transplanted callus. The proportion of morphogenic callus was 3.0–5.2% for Lenok variety; 3.0 - 5.4% - Rosinka; 0.1 - 4.3% - Zaryanka; 3.1 - 5.5% - for L 2053-5-11 line; 6.1 - 7.4% - L 957-8-7. The breeding lines L 2053-5-11 and L 957-8-7 had a high morphogenetic potential.","PeriodicalId":23563,"journal":{"name":"Vestnik of Ulyanovsk state agricultural academy","volume":"49 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85749138","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"EVALUATION OF SERVICING BULLS BY MEAT PRODUCTIVITY OF THEIR OFFSPRING","authors":"T. N. Tishkina, A. P. Velmatov, A. F. Tishkina .","doi":"10.18286/1816-4501-2022-2-165-170","DOIUrl":"https://doi.org/10.18286/1816-4501-2022-2-165-170","url":null,"abstract":"The paper presents data on evaluation of five bulls of ReflectionSovering 198998 and Vis Back Idial1013415 lines of the Holstein breed according to meat productivity of their offspring. The studies were carried out at OOO SP \"Bogdanovskoye\" of the Republic of Mordovia. To solve the problem, five groups of bull-calves from different bulls with 87.5% Holstein heredity in the genotype were formed on the farm. Each group contained 15 animals. As for live weight, the sons of Aimaks 4524 and Mickey 11692064 bulls of Vis Back Idial line were the best. They reached live weight of 499-501 kg by the age of 18 months. The sons of Aimaks 4524 are superior to their peers obtained from the bulls of Benedict 5401, Surprise 980 and Udaloy 76140075 by 16-24 kg (P ≥ 0.95; P ≥ 0.99, P ≥ 0.999). The best parametres of meat productivity were obtained from the sons of the bulls Aimaks 4524 and Mickey 11692064 of Vis Back Idial 1013415 line, carcasses with a weight of 276-278 kg, a slaughter yield of 58.61-58.74%, and a meat index of 4.11-4.27 were obtained. In a comprehensive analysis, namely, in terms of average daily gain of live weight (859-862 g), feed consumption per unit of production (7.64-7.68 k. units) and meat productivity of sons, servicing bulls Aimaks4524 and Mickey 11692064 have the best parametres. It is possible to get young animals with a high growth rate, low feed costs per unit of production, and additionally get 16-18 kg of meat from each animal in case of wide usage of these servicing bulls on breeding and commercial farms.","PeriodicalId":23563,"journal":{"name":"Vestnik of Ulyanovsk state agricultural academy","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85236930","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"DISTRIBUTION OF ELECTRIC POTENTIAL DURING ELECTROMECHANICAL TREATMENT OF CYLINDRICAL PARTS WITH THREE ELECTRODE TOOLS","authors":"Y. Isaev, V. Kurdyumov, S. A. Yakovlev S. A.","doi":"10.18286/1816-4501-2022-1-18-24","DOIUrl":"https://doi.org/10.18286/1816-4501-2022-1-18-24","url":null,"abstract":"Further productivity increase and energy consumption reduction during electromechanical treatment (EMT) of machine parts is possible due to development and application of a three-tool impact on the treated surfaces. In this regard, power equipment for EMT, operating on linear voltage of the electrical power supply, should be used. Taking into account practical zero lag of the electric field associated with low frequency of the current in the active circuit of the EMT, we solved the problem of distributing electrical potentials in a cylindrical part along the radius of the cylinder, on the basis of the Laplace equation, as well as the deviation angle of the desired point from the initial position and the position of the electrode-tool along the axis of the cylinder. The obtained dependences were confirmed by practical experiments, which allowed to construct the surfaces of potential response of a cylindrical part during EMT, depending on the current radius values and cylindrical part length, as well as the deviation angle in the transverse plane of the desired point from the initial coordinate. Thereupon, it is possible to determine the features of heat release in the part during EMT with three tool electrodes. It allows to evaluate the nature of heat distribution over the volume of cylindrical parts during EMT, determine the parameters of the required current source, select the suitable treatment modes, and determine the nature of temperature changes in the workpiece, including in the area of its contact with the tool electrode.","PeriodicalId":23563,"journal":{"name":"Vestnik of Ulyanovsk state agricultural academy","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86992613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"JUSTIFICATION OF HEAT AND ENERGY PARAMETERS OF CONTACT DRYING PROCESS OF GRAIN","authors":"P. Ageev, V. Dolgov, V. Kurdyumov, A. Pavlushin","doi":"10.18286/1816-4501-2022-1-6-11","DOIUrl":"https://doi.org/10.18286/1816-4501-2022-1-6-11","url":null,"abstract":"The purpose of the research is to identify factors that directly affect the thermophysical characteristics of the developed means for grain contact drying. In case of system analysis, this goal is achieved by widespread usage of modeling, which allows to substantiate not only the parameters of the appropriate process mode, but also to choose the most suitable way to control the drying process under production conditions. The conditions for heat transfer from the heating surface to the grain depend on the heat given off by the heating surface of the drying chamber, W; heat transfer coefficient W/(m2 ºС), temperature of the heating surface and the grain at the outlet from the drying chamber, °С; heating surface area, m2. In addition, in case of contact heat transfer, the problem of grain heating is linear (tgr2 = f(z, )), where z is the distance from the grain to the heating surface, m;  - time from the drying process start, s. It was found that the heating temperature limit of the surface of the drying chamber (made in the form of a cylinder, with a screw transporting working body) should not exceed 61С to ensure the grain temperature at the chamber outlet of 39С. In case of using a belt conveyor in the drying chamber and if it is in the form of a rectangular parallelepiped, the temperature limit of the chamber surface heating is 69 С. When the drying chamber is made in the form of a stepped surface enclosed in a box with vibration induction of grain movement, the heating temperature of this surface can be increased to 129 С without harm to the dried grain quality. It also allows to increase the throughput of the device compared to the first version of the drying chamber: from 0.2 t/h to 0.4 t/h.","PeriodicalId":23563,"journal":{"name":"Vestnik of Ulyanovsk state agricultural academy","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90952152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"BIOLOGICAL ACTIVITY OF RHISOSPHERE OF GRAIN FORAGE CROPS IN CASE OF APPLICATION OF BACTERIAL PRODUCTS","authors":"N. N. Shuliko, O. Khamova, Y. Parshutkin, A. M. Streletskiy","doi":"10.18286/1816-4501-2022-1-85-92","DOIUrl":"https://doi.org/10.18286/1816-4501-2022-1-85-92","url":null,"abstract":"The studies were carried out in field experiments of Federal State Budgetary Scientific Institution \"Omsk Agrarian Research Center\" in the southern forest-steppe of Western Siberia. The aim of the research is to study the effect of application of biological products of associative diazotrophs on biological properties of the rhizosphere of grain forage crops of varieties of Omsk selection. The tests were carried out on varieties of spring barley for grain forage and brewing purposes bred at Omsk agrarian scientific centre (FSBSI \"SibSRIA\"): Omsky 95, Sasha, Omsky hulless 1, Omsky 90, Omsky 91, Omsky 101 and oats for cereal purposes - Siberian Hercules. Preparations of complex action produced at All-Russian Research Institute of Agricultural Microbiology (FSBSI All-Russian Research Institute of Agricultural Microbiology:, St. Petersburg, Pushkin) Rizoagrin (Agrobacterium radiobacter), Azorizin (Azospirillum), Mizorin (Arthrobacter mysorens), Flavobacterin (Flavobacterium) were used for inoculation of seeds. The soil of the experimental plot is meadow-black soil, medium-thick, medium-humus, heavy loamy with a humus content of 6.5%, water pH - 6.5. It was found that the microflora population of the rhizosphere of agricultural crops reacted dubiously to application of biological products and depended on genotypic characteristics of the varieties. The greatest positive effect of seed inoculation on the total number of microorganisms was noted in the rhizosphere of barley variety Omsky 95, the increase was 35% when the seeds were treated with Azorizin, with Rizoagrin -70% in relation to the control. The inoculation of oat seeds of Siberian Hercules variety with the bioproduct Flavobacterin contributed to an increase of the total number of microorganisms in the rhizosphere up to 27% compared to the control. The processes of nitrogen immobilization (Kimmob.>1) prevailed in the soil under crops of grain forage crops in the years of the research. The highest coefficient of organic matter (potentially mineralizing) transformation was noted in the rhizosphere of grain-forage barley Omsk hulless 1 when seeds were treated with Rizoagrin - 148 units (109 units in the control) and in the rhizosphere of cereal oat Siberian Hercules when seeds were treated with Mizorin - 91.5 units . (55.8 units in the control).","PeriodicalId":23563,"journal":{"name":"Vestnik of Ulyanovsk state agricultural academy","volume":"36 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76140982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"INFLUENCE OF GROWTH-REGULATING PRODUCTS ON PRODUCTIVITY OF SPRING BARLEY","authors":"N. Ryabtseva","doi":"10.18286/1816-4501-2022-1-59-63","DOIUrl":"https://doi.org/10.18286/1816-4501-2022-1-59-63","url":null,"abstract":"The vector of biologization in agriculture of the Russian Federation and its focus on organic agriculture emphasize the relevance of the conducted research. It reflects the results of the experiment in 2016-2020 and the results of 2021 of the effect of growth-regulating products on the elements of spring barley crop structure on common black soil in the conditions of Rostov region. The studied products are: Biodux; Trainer; Artafit; Obereg; Fulvohumate. The control is water treatment. Barley agrocenoses were sprayed according to the recommendations: 1st - in the tillering phase, 2nd - in the heading phase. The barley forecrop is sunflower. The area of the experimental plot is 600 m2. The placement of variants is sequential on 25 m2 in a 4-fold repetition. As for Leon variety, it was found that barley field germination in field conditions was 88%. Double treatment of the agrocenoses with growth-regulating product contributed to better plant survival by harvesting time (more than 80%), in particular, with Biodux and Obereg (86 and 87%, respectively). Formation and growth of productive stems up to 1.28-1.33 was observed after the first spraying in the tillering phase. The second spraying in the stalk-shooting phase contributed to formation of heavy grain, Obereg impact was especially outstanding, where the mass of a thousand of grains exceeded the control by 2.9 g. The application of growth-regulating biological products increased the number of grains per head (on average, 1 pc more than in the control). It can be concluded that there is yield increase under the influence of growth-regulating products due to all elements of barley productivity, especially under the influence of Obereg and Biodux.","PeriodicalId":23563,"journal":{"name":"Vestnik of Ulyanovsk state agricultural academy","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80525439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"PATHOMORPHOLOGY OF CANDIDAMYCOSIS IN THE LIVER OF REPTILES","authors":"L.I. Drozdova L.I., E.I. Popkov, G.A. Goroshnikova","doi":"10.18286/1816-4501-2022-1-128-134","DOIUrl":"https://doi.org/10.18286/1816-4501-2022-1-128-134","url":null,"abstract":"The article describes our studies on the study of pathomorphological changes in the liver of reptiles with disseminated candidosis. The aim of the research is to study the pathomorphology of mycosis caused by fungi of Candida genus, the features of macroscopic and microscopic changes in liver under the influence of this type of parasitic fungus. The study is aimed at analyzing changes in the hepatobiliary system of reptiles with Candida infection. Pathoanatomical, cytological and histological diagnostic methods were used in the course of the study, with application of: PAS-reaction, Gamorry-Grocott, by Mallory, Van Gieson and Diff-Quikk. Consideration of the issues of pathomorphological manifestation of mycoses, in particular candidosis in the liver of reptiles, was carried out at the Department of Morphology and Expertise of Ural State Agrarian University in 2013 in 2021. To describe the manifestation of yeast-like fungal infections in the liver, we performed a pathoanatomical autopsy of 90 reptiles with a preliminary diagnosis of mycosis, followed by selection, fixation and histological examination of the affected liver according to the generally accepted method. Laboratory research methods were carried out by inoculating biological material on Sabouraud nutrient medium to confirm the diagnosis. We detected changes characteristic of granulomatous process in the liver with candidosis. Granulomas were located both on the surface of the organ and inside. They were pale gray in color, clearly limited, ranging in size from 0.05 to 0.5 cm. The liver parenchyma was loosened, the liver was enlarged, the edges were blunt, the color was from dark red to dark brown. Areas of necrosis with threads of pseudomycelium were revealed in granuloma localization during histological examination of the liver parenchyma. Sinusoidal capillaries were filled with blood in the surrounding tissue, and the vessels in the triad area underwent the processes of mucoid and fibrinoid swelling. Processes of granular, sometimes fatty degeneration were revealed in the parenchyma of the organ.","PeriodicalId":23563,"journal":{"name":"Vestnik of Ulyanovsk state agricultural academy","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81930915","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"BACTERIOPHAGE GENOME AND PROTEOME STUDY OF PHYTOPATHOGENIC PSEUDOMONAS SYRINGAE BACTERIA","authors":"N. Feoktistova, E. Suldina, I. I. Bogdanov, I. Abdurakhmanov","doi":"10.18286/1816-4501-2022-1-99-105","DOIUrl":"https://doi.org/10.18286/1816-4501-2022-1-99-105","url":null,"abstract":"The article describes results of the study of genomic and proteomic characteristics of the production-promising Ps.s-27 bacteriophage of the Ural State Agrarian University, specific for phytopathogenic Pseudomonas syringae bacteria. The sequencing results allowed to determine the DNA size of the studied bacteriophage, which amounted to 24690 bp. These data correspond to the results obtained during electrophoresis (relative error δ= δ= 0.0383). Analysis of correspondence of sequence data to annotated proteomes in GeneMark Prokaryotic V 3.26. identified 28 open reading frames. The localization analysis of the studied proteins was carried out and it was determined that capsid proteins accounted for 61.2% for Ps.s-27 of UlGAU bacteriophage. Data which characterize 28 proteins of the studied bacteriophage were systematized, these data generalize information on the number of amino acids, molecular weight, isoelectric point and gross formula. When performing analysis for Ps.s-27 UlGAU, three dimers were revealed (gene_3, gene_17, and gene_23) with molecular weights of 45.0, 49.1, and 40.9 kDa, which may indicate their potential role in the capsid structure of the studied phage. The obtained data allow us to continue compiling a passport of biological properties of the production-promising Ps.s-27 UlGAU bacteriophage, which is a part of a biopreparation with direct effect.","PeriodicalId":23563,"journal":{"name":"Vestnik of Ulyanovsk state agricultural academy","volume":"81 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74173072","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"DYNAMIC PARAMETERS OF PRODUCTIONAL PROCESS OF EARLY RIPENING SOYBEAN VARIETIES DEPENDING ON MOISTURE CONDITIONS OF THE VEGETATION PERIOD","authors":"M. Belyshkina","doi":"10.18286/1816-4501-2022-1-33-39","DOIUrl":"https://doi.org/10.18286/1816-4501-2022-1-33-39","url":null,"abstract":"Due to change of temperature and moisture regime and the shift of the isotherm of the sum of active temperatures from north to south in the Central region of Non-Black Soil zone, it became possible to expand the areas occupied by soybean crops and introduce new crops to more northern regions. In this regard, it became necessary to analyze the change of dynamic parameters of development of early-ripening soybean varieties of different origin - the northern ecotype, southern and Far Eastern ones in the conditions of the Central region of the Non-lack Soil zone with sufficient moisture supply as well as arid conditions during the growing season. The studied soybean varieties had differences in the growing season duration and the sum of active temperatures. The growing season of varieties of the northern ecotype was 85–100 days, the sum of active temperatures was 1700–1900°C; as for the southern ones: 90–105 days and 1900–2200°C; and the Far Eastern varieties: 95–105 days and 2000–2300°C. The maximum dry biomass averaged 5400–5700 kg/ha under conditions of favorable hydrothermal regime of the growing season, and did not exceed 3400 kg/ha under dry conditions. It was found that in case of sufficient moisture supply (HTC = 1–1.5), the southern varieties are more consistent with the possible variability of thermal resources in the Central region of the Non-Black Soil zone in terms of development than the Far Eastern ones and, along with the varieties of the northern ecotype, can be recommended for cultivation in the region. As far as arid conditions (HTC < 1) is concerned, no fundamental differences between the groups of varieties in terms of production process characteristics were revealed. The duration of the growing season correlated with the temperature and moisture regime of the growing season. The growing season was reduced by 5–8 days on average for varieties in dry years (HTC < 1), in wet years (HTC > 1.6) it increased by 6–10 days.","PeriodicalId":23563,"journal":{"name":"Vestnik of Ulyanovsk state agricultural academy","volume":"59 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73110791","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"INFLUENCE OF LIVE WEIGHT OF HEREFORD CALVES AT BIRTH ON THEIR SUBSEQUENT PRODUCTIVITY","authors":"V. V. Naumova","doi":"10.18286/1816-4501-2022-1-182-187","DOIUrl":"https://doi.org/10.18286/1816-4501-2022-1-182-187","url":null,"abstract":"Beef production technology is based on maximum usage of genetic potential of animal productivity. In this regard, it is important to determine early economically useful traits of animals, including live weight at birth. The aim of the research was to study the influence of live weight of Hereford calves at birth on their subsequent meat productivity. The study was carried out in the conditions of OOO Hereford Organic, Cherdaklinsky district, Ulyanovsk region. Two groups of calves were formed according to the method of pair-analogues, taking into account the date of birth, each group included 10 heads. The differences between the groups were in live weight: group 1 - live weight 22 - 28 kg, group 2 - live weight 30 - 36 kg. As a result of the research, it was found that live weight at birth influences meat productivity of animals. The bull-calves of the second group, which had a live weight at birth of 30 kg or more, outperformed the bull-calves of the 1st group, which had a live weight at birth of 22-28 kg, in absolute gain in live weight by 63.6 kg (14.1%) and average daily gain by 117 .8 g (14.1%). Large heifers grew and developed better than smaller heifers. Their live weight at 18 months exceeded the live weight of heifers of the 1st group by 35.5 kg (8.3%). The bulls of the second group exceeded the weight of the carcass of the peers of the first group by 43.9 kg, which is 16.3%, the carcass yield by 0.6 p.p., the slaughter weight by 47.5 kg or 16.8%, the slaughter yield by 0.8 p.p. Also, the flesh content in their carcasses was higher by 33.6 kg, or 17.0%, fat by 4.7 kg, or 26.6%.","PeriodicalId":23563,"journal":{"name":"Vestnik of Ulyanovsk state agricultural academy","volume":"62 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91266142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}