Библиотека ELiS

Growth and ethological features of juvenile rainbow trout (Parasalmo mykiss, Walbaum) depending on the type of feed

Submitted by Гость (not verified) on Mon, 07/29/2024 - 22:38

During early postnatal ontogenesis, juvenile rainbow trout undergo a number of morphological and physiological changes, passing through various stages of development of body systems and behavioural traits. The most important factor influencing these processes is the fish diet. The present study provides data on external indicators, morphometric and ethological characteristics of juvenile rainbow trout fed with factory starter and frozen feeds. Methods of continuous logging and recording of fish behavioural responses and morphometric methods to analyse juvenile growth were used.

Factors affecting gynogenesis induction in cucumber (Cucumis sativus L.) through ovary culture

Submitted by Гость (not verified) on Mon, 07/29/2024 - 22:38

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Improving the efficiency of doubled haploid technology is an urgent task to expand the possibilities of fundamental research and to increase the selection rate of commercial F1 hybrids. This study investigated the effect of the components of the induction nutrient medium: casein hydrolyzate ( 250 mg/l and 500 mg/l ) , glutathione ( 10 mg/l) , a combination of growth regulators TDZ ( 0.04 mg/l) and 2,4-D ( 0.15 mg/l) on the gynogenic response of cucumber in unfertilized ovules culture.

Effect of the genotype of bull calves on the consumption and use of nutrients in the diet

Submitted by Гость (not verified) on Mon, 07/29/2024 - 22:38

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In beef cattle breeding, it is necessary to identify and widely use animals characterized by high rates of nutrient utilization in the diet for the synthesis of meat products. The aim of the study was to evaluate the efficiency of digestion of nutrients in the diet of purebred bull calves of the breeds Simmental (group I) and Limousine (group II) and their crossbreeds of the first (½ Simmental × ½ Limousine – group III), the second (¼ Simmental × ¾ Limousine – group IV) and the third (1/8 Simmental × 7/8 Limousine – V group) generations.

Effect of drought on the development of yield structure elements of spring barley varieties

Submitted by Гость (not verified) on Mon, 07/29/2024 - 22:38

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In the researches carried out in 2021–2023 at the Federal Agricultural Research Center of the North-East named N.V. Rudnitsky (Kirov) in the conditions of the vegetation experiment, 10 varieties of spring barley of different origin were evaluated by simulation of drought (breeding varieties of the Federal Agricultural Research Center of the North-East named N.V. Rudnitsky of hybrid and regenerative origin, collection samples).

Features of flowering and fruit formation of Juglans regia L. with the lateral type of fruiting in the conditions of the Non-Chernozem region of Central Russia

Submitted by Гость (not verified) on Mon, 07/29/2024 - 22:38

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The research was carried out at the Department of Fruit Crops of the Educational, Scientific and Production Center of Horticulture and Vegetable Crops named after V.I. Edelstein of the Russian State Agrarian University – Moscow Timiryazev Agricultural Academy in Moscow in 2021–2023. Flowering and fruiting of Juglans regia L. were evaluated during three years. It was found that J. regia plants with the lateral type of fruiting, which is characterized by the formation of female flowers in most axillary buds of the current year’s growth, have a high adaptive potential.

Breeding value of mutant forms of spring barley in the conditions of the Volga-Vyatka region

Submitted by Гость (not verified) on Mon, 07/29/2024 - 22:38

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Many crops have a very small genetic “base”. The use of a limited number of parental forms reduces the genetic diversity of commercial varieties and exacerbates the problem of their resistance to adverse environmental factors. Induced mutagenesis is one of the means to generate genetic variation in crops in a shorter time compared to crosses and can be used to develop source material for breeding and new varieties with high yields, excellent product quality, resistance to climate change and tolerance to biotic and abiotic stresses.

Current state of soils in forest nurseries in the taiga zone of European part of Russia

Submitted by Гость (not verified) on Mon, 07/29/2024 - 22:38

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When producing planting material in the taiga zone, it is extremely important to assess problematic sites in forest nurseries. Attention should be paid to poor soil quality, which can significantly affect the growth rate of seedlings and the yield of standard planting material. The article considers a comprehensive assessment of soil conditions in forest nurseries of the taiga zone of the European part of Russia. The research was conducted in six forest nurseries. Agrochemical and physical properties of soils were determined.

Features of development of Verbascum species in Central Yakutia

Submitted by Гость (not verified) on Mon, 07/29/2024 - 22:38

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The possibility of cultivating mullein species in Central Yakutia, which are relatively undemanding plants in terms of moisture, is of scientific and practical interest in order to determine their biological potential and the possibility of using them as ornamental and medicinal plants. The aim of the work is to identify the peculiarities of the developmental rhythms of some species of the genus Verbascum in the permafrost conditions of Central Yakutia. The objects of the study were 11 samples of the species V. chaixii subsp. austriacum, V. densiflorum, V. nigrum, V. nigrum subsp.

Analysis of the results of mathematical modeling of the impact of sanctions on agriculture in the Southern Federal District of the Russian Federation

Submitted by Гость (not verified) on Mon, 07/29/2024 - 22:38

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The article presents a scenario analysis of the possible consequences of the current sanctions on agriculture in the Southern Federal District of the Russian Federation. The study is based on the spatial model of partial equilibrium in the wholesale markets of agricultural products of the subjects of the Russian Federation of the Federal State Budgetary Institution “All-Russian Institute of Agrarian Problems and Informatics named after A.A.

Determination of the analytical sensitivity and specificity of PCR methods for the diagnosis of bacterial spot of tomato

Submitted by Гость (not verified) on Mon, 07/29/2024 - 22:38

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The work is devoted to molecular genetic methods for the diagnosis of pathogens of bacterial spot of tomato – a harmful bacterial disease of tomatoes and peppers, predominantly spread in the open ground in the southern regions. The research was conducted on the basis of the All- Russian Plant Quarantine Center (FGBU “VNIIKR”) in 2022–2023.