„nutrition“ 49 výsledků

This research was focused on a production potential of tall wheatgrass (TW) and perennial rye (PR) grown in marginal and contrasting soil climatic conditions under the following mineral nutrition: (a) intensive nutrition of 245.0 kg/ha NPK, (b) semi-intensive nutrition of 122.5 kg/ha NPK and (c) untreated control of 0.0 kg/ha NPK. The large-scale pilot field experiments with two varieties of TW: Szarvasi-1 and Alkar as PR: Kriszta and Gergő were carried out on 4 research sites during 4 years (2016/17 to 2019/20). Despite the contrasting soil conditions, yields were variously affected by (i) nutrition, (ii) site, (iii) variety and (iv) year (the order based on their F-ratios). A dry matter (DM) yield of 5.29 t/ha on average was found, it ranged from 0.01 to 13.46 t/ha. Average - minimal - maximal variety yields were as follows: Szarvasi-1 6.01 - 1.05 - 13.46 t/ha, Alkar 5.86 - 0.62 - 12.90 t/ha, Kriszta 5.06 - 0.01 - 13.21 t/ha and Gergő 4.25 - 0.05 - 10.60 t/ha. Under intensive or semi-intensive nutrition both crops are suitable for all types of tested marginal soils. TW better tolerated unexpected water-logging that occurred on Site-2 with heavy clay soil than PR, while PR is more suitable for light sandy soil. The following average DM yields were obtained under intensive nutrition on the most productive Site-3 with heavy soil: 11.77 t/ha Szarvasi-1, 10.14 t/ha Alkar, 8.01 t/ha Kriszta and 7.75 t/ha Gergő, whereas on Site-1 with light sandy soil under intensive nutrition the following average yields were achieved: 7.74 t/ha Gergő, 7.72 t/ha Kriszta, 6.29 t/ha Szarvasi-1 and 5.17 t/ha Alkar. PR had about 148 mm less precipitation on average when compared to TW (187 vs. 334 mm) because of earlier harvest time while the average daily temperature was lower by about 1.9 °C on average (16.3 vs. 18.2 °C). As to varieties Kriszta and Gergő, it is probably one of the first original research papers published and probably the first research based on large-scale experiments of PR from the time when it was recognized as an energy crop.

The purpose of the study was to determine what changes will occur under the influence of six-week consumption of full-fat yogurt made from sheep's milk from ewes fed with iodine-enriched feed in relation to indicators of thyroid function – thyroid-stimulating hormone (TSH), free triiodothyronine (fT3), free thyroxine (fT4), but also to selected biochemical and anthropometric parameters. The intervention group consisted of nineteen women aged 54 ±7 years. It was a hyper-cholesterolemic group with a non-atherogenic lipid profile. Six-week consumption of sheep's yogurt contributed to the intake of an important element in human nutrition, but did not cause changes in the function of the thyroid gland, nor in the state of the hormones that produce or regulate its activity. TSH decreased from 2.6 ±1.0 mlU.l-1 to 2.4 ±1.0 mlU.l-1, fT4 increased from 15.2 ±1.5 pmol.l-1 to 15.3 ±1.7 pmol.l-1, but there were no statistically significant changes (P >0.05). The value of fT3 did not change at all (4.8 pmol.l-1). The intervention had no significant negative impact either on the lipid profile or other biochemical and anthropometric parameters. Our findings indicate that the consumption of full-fat sheep's yogurt not only contributes to the intake of iodine in the diet, but in terms of fat content does not cause health complications and deterioration of the lipid profile or other biochemical or anthropometric parameters

Keel bone damage (KBD) is a multifactorial problem. This problem applies to all types of housing systems, caged as well as cage-free systems, including free-range and organic. The common causes are in particular collisions with the elements of the environment, such as perches, as well as collisions between hens. Extremely high frequency and severity of damage adversely affects not only welfare of laying hens also their production and egg quality too. This article provides an overview of current knowledge about the occurrence of KBD, the causes of its occurrence and consequences for the quality of life of laying hens in intensive large-scale production conditions. In the introductory part, we describe what keel bone is, the high incidence and prevalence of the problem, which implies the importance of long-term dealing with this issue at the global level. In the next part, we deal with the factors that can cause the occurrence of KBD, the relationship between the occurrence of KBD and bone quality, nutrition with an emphasis on calcium, the relationship between KBD and welfare, individual housing systems, age, genotypes of hens, feathering, efficiency and quality of production of laying hens and in the final part section we present detection methods. As already mentioned, the occurrence of KBD is influenced by a number of factors, but due to the differences in the prevalence of this problem in different countries, further comprehensive research is needed. The deviations and fractures of the keel bone can have a negative impact on the welfare of laying hens, which will subsequently be reflected in the possible painfulness of feed intake, laying, product quality, which ultimately will always affect economic efficiency. The goal of long-term research should to try to reduce the incidence of these conditions, or their prevention. It is important to deal with genetic selection, nutrition, a very important area, as far as KBD is concerned, are the conditions of the breeding environment, especially the housing system and the elements that make up the equipment of the rearing and breeding area, as well as the standardization of the methods used to detect damage to the keel bone. Palpation, post-mortem palpation, multiple sensing technologies are used. Researcher training can significantly improve both the accuracy and reliability of assessment of sternal fractures and deviations. If the results of keel bone prevalence will be compared or combined between individual studies, all methods used to detect keel bone damage should be accurate, i.e. sufficient methodological details should be given for each study and the method of determining prevalence should be standardized.

The work evaluates the content of nutrients, rumen digestibility of NDF, degradability of CP, and intestinal digestibility of rumen un-degradable proteins in protein forages and concentrated feeds. The analysis of nutrient content confirmed along with the increase of plant maturity expressed by the increase of NDF, a significant decrease of NFC and CP in the regression dependence R2 = 0.7649 and R2 = 0.7116, respectively. The in situ method after 30 hours of incubation confirmed the higher NDF digestibility (P <0.001) of young roughages. The degradability of CP in alfalfa and grass silages was on average 78.7 ±6.1% or 63.7 ±9.7%. Higher protein degradability was confirmed in early-stage forages compared to mature forages for alfalfa (P <0.05) and grass (P <0.01) silages. Intestinal digestibility of un-degradable proteins determined by the modified three-step method was on average 64.1 ±2.5% in alfalfa silages and 51.0 ±5.6% in grass silages, with a statistically significant decrease (P <0.05) in mature forages. The obtained values of rumen degradability of crude protein confirmed a significant difference (P <0.001) between concentrates ranging from 20.3 to 76.0% (mean 58.1 ±3.0%) according to heat treatment. Intestinal digestibility of un-degraded protein varied from 54.5 ±1.4% in raw soybean to 95.2 ±1.0% in corn gluten feed. This study showed that the digestibility factor of crude protein and intestinal digestibility methods for protein feeds can be used in models to optimize the protein nutrition of dairy cows.

Silages represents the principal component of the diet of high-producing dairy cows. The objective of this review is to provide a comprehensive summary of the existing literature on the impact of silage quality on the feed intake, performance, and health of dairy cows. The review described the impact of the nutritional quality of silages and fermentation products on dairy cow performance, including the implementation of preventive practices to avoid the undesirable fermentation process. The following section focused on the prevalence of pathogens that present a risk to animals and humans. A summary was provided of the most recent findings on the occurrence of Clostridium spp., Enterobacteriaceae, Bacillus spp. and Listeria monocytogenes in silage. The final section of the review addressed the most recent findings on the prevalence of undesirable metabolites, such as mycotoxins and biogenic amines, in silage. The mycotoxin section concentrated on the adverse health effects of elevated mycotoxin concentrations in dairy cow feed rations.

Effective pre-sowing design of crop agrocenoses involves the assessment of possible compensatory mechanisms of plants when changing the nutrition area against the background of corrective fertilization. In order to study such mechanisms and determine the influence of vegetative and reproductive architectonics of plants on the resulting indicators, a five-year cycle of research was conducted on oilseed radish (Raphanus sativus L. var. oleiformis Pers.). The studies used a full range of options for pre-sowing design of oilseed radish agrocenoses from maximum thickening (4 million germinating seeds ha-1 for ordinary row sowing sowing, individual plant nutrition area 25 cm2) to maximum thinning (0.5 million germinating seeds ha-1 for wide-row sowing, 200 cm2). To evaluate the effectiveness of the regulating fertilizer, four variants of it were used: N0P0K0, N30P30K30, N60P60K60, N90P90K90. Based on the use of morphological features of the stem, indicators of the structure of individual seed productivity, correlation and regression analysis, the optimal parameters of formation of oilseed radish agrocenosis were determined. It was based on its ability to intensive lateral productive branching of the stem with a decrease in the seeding rate (increase in the area of plant nutrition, change in the method of sowing), taking into account the growth-stimulating effect of mineral fertilizer.

The aim of this study was to determine the fat content and fatty acid profile of 5 commercial dry granulated dog foods purchased in Slovakia and to compare the analyzed content with the minimum requirements for fat and fatty acid content according to FEDIAF (2021), and also to compare the fat content with the manufacturer‘s declared fat content on the packaging. The samples were analyzed in the Laboratory of Quality and Nutritional Value of Feeds, Slovak University of Agriculture in Nitra, according to standard laboratory procedures and techniques. The results confirmed that four out of the five puppy compound feeds tested, met the requirements for fatty acid content according to FEDIAF (2021). All samples met the requirements for a minimum fat content of 85.00 g.kg-1 DM, a minimum linoleic acid content of 13.00 g.kg-1 DM, a minimum arachidonic acid content of 0.30 g.kg-1 DM, and an α-linolenic acid content of 0.80 g.kg-1 DM. Four samples met the minimum EPA + DHA content requirement, while sample E did not meet the minimum limit (0.50 g.kg-1 DM). When comparing the declared fat content on the packaging and the determined total fat content of the tested foods, we found a lower fat content of 0.23% for sample B and 4.78% for sample C.

Annona muricata, commonly known as soursop or graviola, is a tropical evergreen tree belonging to the Annonaceae family, widely recognized for its diverse medicinal and nutritional properties. This plant is native to Central and South America but is now cultivated in tropical and subtropical regions worldwide. It thrives in warm, humid climates, requiring well-drained soils with moderate rainfall to grow optimally. The tree produces large, green, spiny fruits with soft white pulp, which are widely consumed as fresh fruit or used in beverages, desserts, and traditional cuisines due to their unique flavour and nutritional benefits. Traditionally, A. muricata has been utilized in folk medicine to treat a variety of ailments, including diabetes, hypertension, cancer, inflammation, bacterial infections, and much more. Nearly every part of the plant (leaves, bark, roots, fruit) contains bioactive compounds such as acetogenins, alkaloids, flavonoids, and phenolics, which contribute to its therapeutic effects. In vivo and in vitro studies have highlighted its pharmacological activities, including anti-cancer, antioxidant, antimicrobial, anti-inflammatory, anti-diabetic, and anti-hypertensive properties, etc. However, recent research has raised concerns about the potential neurotoxic effects of certain compounds in A. muricata, particularly annonacin, which has been associated with neurodegenerative conditions in high doses. While the plant holds promise for therapeutic applications, further research is needed to clarify its mechanisms of action, evaluate its safety profile, and determine appropriate dosage levels to balance efficacy and toxicity. This review provides a comprehensive overview of A. muricata, including its botanical description, growing environment, traditional and food uses, pharmacological studies, and considerations regarding potential neurotoxicity.

The colostrum consumed by newborn ruminants immediately after birth plays a crucial role in ensuring their long and healthy lives. It is their first nutrition, supporting growth, development, and immunity against diseases. The study involved eight goat crossbreeds of Saanen × Makatia and Saanen × Alpine goats, raised in the Ghardaia region, known for its arid climate. Colostrum samples were collected during four days after kidding. Each sample was subjected to the evaluation of the microbiological quality and the key physicochemical properties, including fat and protein content, pH, titratable acidity, density, conductivity, appearance, and colour. The results showed a decrease in fat and protein content from day one to day four in both goat populations, although the differences in the four-day averages were not significant. Acidity and density also followed a decreasing trend, with the difference in four-day averages being significant in the Saanen × Makatia group. In terms of pH, variation over the four days was not significant. Conductivity values increased consistently in both populations. Microbiological analysis revealed the absence of sulphite-reducing Clostridium, Salmonella, and yeasts in all samples. The counts of Staphylococcus aureus, total aerobic mesophilic flora, and total and faecal coliforms remained within acceptable limits for raw milk, indicating that the colostrum was of satisfactory microbiological quality.