As a result of the treatment of “Vikros” spring canola with the chemical mutagen ethyl methanesulfonate (EMS), a high-protein mutant form without glaucous bloom (wax bloom) on leaves, shoots, and siliques was isolated. Segregation into glossy and glaucous forms was always observed in the progeny of glossy plants from self-pollination, and the proportion of glaucous plants could reach up to 25%. The progeny of glaucous plants were homogeneous and did not segregate. If during the period of seed germination and seedling development the soil did not dry out and remained moist, and the average daily temperature did not exceed 16 °C, then the amount of glossy plants could reach 99%. Glossy plants possessed qualities valuable for breeding forage varieties, such as the increased content of protein in seeds (more than 30%), and change phenol metabolism, чтo прoявляется a reduced amount of lignin and sinapine in comparison with the original cultivar. In addition, plants without wax coating showed weakened shoot growth, decreased pollen fertility and seed production, and reduced lignin content in the shoots. Glossy mutants are of interest for the obtaining of fodder low-sinapine and low-lignin varieties of spring rapeseed.
The effectiveness of cattle breeding is mostly determined Forage base. Currently, cattle productivity in the Russian Federation is increasing, and this requires a more careful approach to assessing the quality of feed. This primarily applies to such types of feed like hay, silage, haylage, which make up 60-85% in the average daily diet of livestock. The nutritional value of these types of feed depends mostly on the content and ratio of crude protein and crude fiber in perennial grasses when they are harvested. In the early phases of plant development, crude protein predominates in its composition, and the fiber content is insufficient. Therefore, mowing perennial grasses in these terms is irrational. With the growth and development of the plant, its transition to the heading stage, the crude protein content decreases with increasing fiber content. Harvesting perennial grasses at a time when they contain a large amount of fiber and low protein is also irrational since the low protein content in feed does not contribute to the growth of animal productivity. The optimum time for harvesting herbs is considered to be the time when the crude protein content is 14-16%, and crude fiber – 26-28%. Determination the content of these elements is a rather laborious and expensive process, the analysis lasts about three days. Only large agricultural enterprises can afford to carry out such analyses. At the same time, today, there are technologies for remote sensing of crops, which in this case can be carried out using unmanned aerial vehicles (UAVs). Currently, with their help, the nitrogen content in plants is determined. The authors of this paper propose a digital technique for remote determination of crude fiber and crude protein, which determines the optimal timing of the harvesting herbs.
The purpose of this study is to evaluate cereal grasses – Bromus inermis, Festuca pratensis, Phleum pratense, and legumes: Trifolium pratense, Medicago varia in terms of their content of acid-detergent fibre (ADF), neutral detergent fibre (NDF), acid-detergent lignin (ADL) and hemicellulose (HC), cellulose depending on phases of vegetation – grasses: at vegetative, earing and flowering; legumes– vegetative. It was found that as the herbs grow, an increase in all fractions of the cell walls of leguminous herbs is observed, the cell walls occupy a smaller fraction of dry matter than in grasses, due to the lower HC content in them –10-12%, compared with 25-30% in grasses. The contents of ADF, NDF and ADL (% of dry matter) in grasses prior earing are 31-31, 50-55, 4-6: in earing – 32-37, 55-65, 5-6; in flowering – 40-45, 65-70 and 70-72, 7-9, respectively. Legumes have a higher content of ADL. As plants grow, the relative proportion of ADF in NDF increases, but it does not exceed 50% in grasses. In legumes – 70-80% regardless of the growth phase, explains the lower digestibility of legumes than grasses. To judge the levels of ADF and NDF in herbs, depending on the content of crude fibre (CF), the corresponding regression equations were calculated for grasses and feed prepared from them. The relationship between CF and ADF was closer (n = 64, s = 2.4%, r = 0.93) than between CF and ADL (n = 64, s = 4.4%, r = 0.87). Based on these studies and generalisation of the literature data, ADF and NDF in hay and haylage standard are recommended.
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