In our experiment, we deal with the phenomenon of radiation hormesis and improvements based on this phenomenon to different growing characteristics of the fast-growing, very feed-efficient, and with a high-yielding carcass hybrid of the Peking duck (Cherry Valley SM3 medium). In the first phase of the project, we exposed hatching duck eggs to low and middle doses of gamma radiation 60Co (0.06-2.00 Gy) before placing them into a setter in the hatchery. We then followed the standards of artificial incubation. The treatment of our chosen doses of gamma radiation has no significant influence on the history and results of hatching (from 85.5% to 92.6%); it was influenced only by the basic management and husbandry of the parent stock. From our observations we confirm that the Peking duck, despite genetic progress, retained its vitality and robustness. Its embryos are not damaged even with a dose of 2 Gy, which is over the deterministic effect of ionizing radiation for vertebrates. At the end of the fatting period a significant drop in plasma phosphorus levels was measured in the ducks; however, it was dependent on the radiation dose to which the hatching eggs were exposed (r = -0.965). A positive effect of radiation hormesis may be expected in the case of 1 Gy dose where the highest values of mean corpuscular hemoglobin, mean corpuscular hemoglobin, combined hemoglobin, and drake weight were measured. Lower and higher doses of ionizing radiation used did not display these effects.
- MeSH
- hormeze MeSH
- kachny fyziologie MeSH
- náhodné rozdělení MeSH
- ovum fyziologie účinky záření MeSH
- radioizotopy kobaltu aplikace a dávkování MeSH
- rozmnožování účinky záření MeSH
- vztah dávky záření a odpovědi MeSH
- záření gama * MeSH
- zvířata MeSH
- Check Tag
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
1. The aim of this study was to investigate if male-to-female aggression of common pheasants in the course of the breeding season was related to the concentration of plasma testosterone and/or other biochemical plasma indicators in male pheasants housed in breeding cages. The influence of season on the concentration of testosterone and biochemical indicators was also investigated. 2. Males were divided into non-aggressive and aggressive groups during the breeding season based on ethological evaluation. At the beginning, in the middle and at the end of the breeding season, a blood sample was taken from all males on the same day and the concentration of selected biochemical indicators and the total circulating testosterone in the plasma were determined. 3. Male-to-female aggression during the breeding season of pheasants was not influenced by the total plasma testosterone of males. 4. The concentration of total plasma testosterone in males decreased gradually during the breeding season. 5. Male-to-female aggression of pheasants did not have a significant effect on any of the assessed biochemical indicators. 6. The influence of the breeding season affected the activities of alanine aminotransferase and aspartate aminotransferase as well as the concentrations of glucose, magnesium, potassium and chloride in the blood plasma of cage-housed male pheasants.
- MeSH
- agrese * MeSH
- chov zvířat MeSH
- Galliformes krev fyziologie MeSH
- testosteron krev MeSH
- zvířata MeSH
- Check Tag
- mužské pohlaví MeSH
- ženské pohlaví MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
The objective of this study was to investigate whether melamine (MEL) is biotransformed into cyanuric acid (CYA) in male broiler chickens. The effects of the dietary addition of MEL and CYA alone and in combination on the growth performance and mortality of the chickens were also investigated. The chickens were divided into six experimental groups and were fed diets with an addition of 50 or 100 mg/kg MEL or 50 or 100 mg/kg CYA of diet, with the contaminants added separately or in combination. The control group was fed a diet without MEL or CYA. At the end of the experiment (day 40), samples of liver, kidney and breast and thigh muscles were collected from 12 birds per treatment group and were analysed for the presence of MEL and CYA. This study showed that MEL is biotransformed into CYA in broilers. Higher concentrations of MEL or CYA in the diet increased the presence of their residues in tissues, and the CYA residue concentration was several times higher in the respective tissues than the MEL residue concentration. The dietary addition of MEL and CYA did not affect the mortality rate, feed conversion ratio or body weight of the chickens.
- MeSH
- biotransformace MeSH
- játra účinky léků metabolismus MeSH
- kontaminace potravin analýza MeSH
- kosterní svaly účinky léků metabolismus MeSH
- krmivo pro zvířata analýza MeSH
- kur domácí růst a vývoj metabolismus MeSH
- ledviny účinky léků metabolismus MeSH
- tělesná hmotnost účinky léků MeSH
- tkáňová distribuce MeSH
- triaziny aplikace a dávkování metabolismus farmakokinetika toxicita MeSH
- vztah mezi dávkou a účinkem léčiva MeSH
- zvířata MeSH
- Check Tag
- mužské pohlaví MeSH
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
1. The aim of the study was to investigate the effect of melamine-contaminated feed (100 mg/kg) on the distribution of melamine and cyanuric acid in the tissues of laying hens. The effect of a 5-week melamine administration in feed on the egg quality and blood variables of layers was also investigated. 2. A total of twenty 36-week-old ISA Brown layers were used in the experiment. The layers were equally divided into an experimental melamine group (n = 10) and a control group without melamine (n = 10). At the end of the experiment, samples of liver, kidney, breast and thigh muscles were collected from all hens and analysed for the presence of melamine and cyanuric acid by gas chromatography and tandem mass spectrometry. 3. Layers receiving the melamine-contaminated diet laid eggs with decreased eggshell strength. The decrease in shell strength was found in weeks 3 and 4 compared to the initial state (week 0) and week 1. 4. Hens receiving the melamine-contaminated diet also exhibited a higher total red blood cell count and lower mean corpuscular haemoglobin compared to the control group. However, melamine at 100 mg/kg feed had no effects on the blood variables of layers. 5. Melamine was detected in all analysed tissues of layers fed on the melamine-contaminated diet, with its mean concentrations decreasing in the following order: kidney (7.43 mg/kg) > breast muscle (3.88 mg/kg) > liver (3.11 mg/kg) > thigh muscle (1.91 mg/kg). The kidney and liver of layers fed on the melamine-contaminated diet also exhibited the presence of cyanuric acid. 6. On the basis of our results, it can be concluded that the biotransformation of melamine into cyanuric acid proceeded mainly in the liver, and cyanuric acid was eliminated in urine.
- MeSH
- biotransformace MeSH
- játra metabolismus MeSH
- krmivo pro zvířata * MeSH
- kur domácí růst a vývoj fyziologie MeSH
- plynová chromatografie s hmotnostně spektrometrickou detekcí MeSH
- počet erytrocytů MeSH
- testy toxicity MeSH
- triaziny metabolismus toxicita MeSH
- vaječná skořápka účinky léků fyziologie MeSH
- vejce MeSH
- zvířata MeSH
- Check Tag
- zvířata MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
Přístroj REBOX je dobře využitelný na diagnostilu i terapii různých bolestivých stavů. Hlavní indikace jsou akutní myalgie i chronické vertebrogenní a artrototické potíže. Nástup účinku může být odložený, a proto terapie musí být dlouhodobá.
The device REBOX is well designed for diagnostic and therapeutical procedures in various painful conditions. The principal indications involve acute myalgias and chronic vertebrogenic and arthritic complaints. The onset of effect may be delayed; the therapy must be long prolonged thusly.
- MeSH
- farmaceutický průmysl MeSH
- léčivé přípravky chemie MeSH
- lidé MeSH
- Check Tag
- lidé MeSH
- Geografické názvy
- Československo MeSH
