Browsing by Subject "alfalfa"

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Alfalfa and red clover as a protein source for ruminants
(Institute for Animal Husbandry, Belgrade-Zemun, Serbia, 2021-10-06) Marković, Jordan; Milenković, Jasmina; Andjelković, Snežana
High level of milk protein, increased dietary costs, as well as care for the environment have made nitrogen utilization a central component in balancing ruminant meals. Excess crude protein in meals can lead to unnecessary dietary costs, without resulting in increased milk and milk protein production. In addition, most of the excess nitrogen is excreted in the urine and is an ecologically labile form. On the other hand, poor amino acids balance will limit milk protein yield, making production more expensive than overeating. Balancing protein according to metabolic needs, with an adequate ratio of rumen undegradable protein and rumen degradable protein, and without overeating will have positive effects not only on meal price and profitability, but also on the environment. More efficient utilization of nutrients requires knowledge of how different fractions of nutrients pass through the digestive tract. Grass and legumes contain the largest and most variable part of non-protein nitrogen compounds. Although, a number of non-protein nitrogen compounds and true protein together represent crude protein, it is clear that the nutritional value of crude protein in ruminant feeds is better explained based on their rate and extent of rumen degradation. There are a number of factors that affect the amount of crude protein that will be degraded in the rumen. Legumes are high quality forages rich in protein, but these proteins are intensively degraded in the rumen. Red clover proteins are more slowly degraded than alfalfa protein.
Non-fiber carbohydrates and neutral detergent-soluble fibre in alfalfa
(Research Institute of Mountain Stockbreeding and Agriculture, Troyan, 2021) Marković, Jordan; Babić, Snežana; Lazarević, Đorđe; Milenković, Jasmina; Prijović, Mladen; Zornic, Vladimir; Vasić, Tanja
Carbohydrates are important in the nutrition of animals because they are the major source of energy and typically comprise 70 to 80{\%} of the diet. Carbohydrate contents of forage can vary widely due to the interaction of plants and their environment. These variables include: species and variety of the forage, stage of growth and environmental conditions during plant growth. The aim of this study was to estimate the content of NFC-Non-Fiber Carbohydrates and NDSF -- Neutral Detergent Soluble Fiber depending on the stage of growth, cuts and cultivars of alfalfa. Alfalfa (Medicago sativa L.) -- cv K28 selected at Institute for forage crops Kru{\v{s}}evac and cv G+13R+CZ selected at UC Davis Plant Breeding Center, University of California were sampled at three stages of maturity: full bud, early bloom (10-15{\%} of flowering) and mid bloom (50-60{\%} of flowering) in four cuts during the year. Results of this investigation showed that alfalfa cultivars did not differ significantly in NFC and NDSF content. On the other hand, content of NFC decreased from 237.0 to 230.6 g kg -1 DM with growth and development, whereas content of NDSF increased with plant development from 131.5 to 136.8 g kg -1 DM, but the differences between treatments were not significant. The highest content of NFC and NDSF was observed in the third cut. These carbohydrates are considered to be highly digestible and rapidly fermentable. Improving the understanding of this large portion of the dairy cattle diet has the potential to improve animal performance and profitability while maintaining health.
The influence of bacterial inoculation on development different cultivars of alfalfa
(Research Institute of Mountain Stockbreeding and Agriculture, Troyan, 2021) Andjelković, Snežana; Radović, Jasmina; Lugić, Zoran; Babić, Snežana; Marković, Jordan; Milenković, Jasmina; Petrović, Mirjana
Increasing soil fertility is one of the strategies being implemented with the objective of increasing agricultural production. The addition of microbial inoculants can stimulate plant-growth-promoting mechanisms, improve soil fertility, replenish the natural microbial community. There are different mechanisms by which microorganisms increase soil fertility and supply plants with necessary elements. The experiment was a two-factorial, random block design with ten replicates, where the first factor was alfalfa cultivar and the second was the variant of bacterial inoculation. For the purposes of research three alfalfa cultivars (K−28, Affinity+Z and Perry) and two variants of microbial inoculation − individual cultures of rhizobium (Sinorhizobium meliloti) and azotobacter (Azotobacter chroococcum) were used. The analysis of plant traits (height, number of stems and plant weight) were done at the beginning of flowering. The results obtained showed that the application of microorganisms can affect the parameters of plant alfalfa. The interaction between cultivar and applied inoculation was different: In the cultivar alfalfa Affinity+Z a statistically significant increase in plant height (4.4{\%} higher value than control) and mass was recorded (16.1{\%}); in Perry cultivar the green mass per plant was increased (4.3{\%} on treatment with S. meliloti and 2.3{\%} on treatment with A. chroococcum). In all cultivars inoculation A. chroococcum had positive, but application of S. meliloti had negative effect on the number of stems was achieved.
Uticaj primesa u naturalnom semenu lucerke i crvene deteline na proces čišćenja semena
(2021) Đokić, Dragoslav; Terzić, Dragan; Rajičić, V.; Živković, S.; Oro, V.; Milenković, Jasmina; Koprivica, R.
The paper presents the results of the cleaning process of five different lots of natural alfalfa seeds and five different lots of natural red clover seeds. Natural alfalfa and red clover seeds had 75 % to 77 % purity. The experiment was performed in the seed processing center of the Institute for Forage Crops Kruševac. Seed cleaning is performed on different machines that work on the principle of differences in the physical properties of seeds. Significant parameters that define the quality of seeds after processing on the cleaning equipment are the amount of pure seed, weed seed, the seed of other crops, inert matter, amount of pure processed seed, seed losses and processing output. The obtained results enable the correct adjustment of the equipment for the seed processing, depending on the amount and type of weeds and other impurities found in the natural seed of alfalfa and red clover.