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PL
W związku z obserwowanymi niezadawalającymi wynikami krycia norek, podjęto próbę zastosowania hormonalnej stymulacji samic odmiany białej Hedlunda niepokrytych do 19 marca. W celu uzyskania poprawy płodności samice stymulowano 19 marca dwoma rodzajami preparatów hormonalnych, podając je w formie iniekcji 24 godziny przed planowanym kryciem. Preparat 1 zawierał surowiczą gonadotropinę (PMSG) wykazującą silne działanie głównie o charakterze FSH, preparat 2 zawierał syntetyczną gonadorelinę, będącą odpowiednikiem naturalnego hormonu uwalniającego gonadotropiny przysadkowe. W wyniku przeprowadzonych badań stwierdzono, iż podane preparaty nie wpłynęły znacząco na badane parametry rozrodcze, nie stwierdzono istotnych różnic w długości ciąży, wielkości miotu i liczbie żywych szczeniąt w miocie między samicami grup doświadczalnych i kontrolnej.
EN
Mink females (Hedlund white color), which were not mated to 19 March, were stimulated at the same day with the injection of two preparations: preparation 1 contained PMSG and showed mostly the FSH activity, the preparation 2 – synthetic gonadoreline, equivalent to naturally GnRH. The results showed that both preparation did not influence significant on reproductive parameters, and the differences in gestation length, litter size, number of young born in a litter between the experimental and control groups were also not significant.
EN
The American mink (Neovison vison) is a species that experienced unprecedented ecological success in the 20 th century, which can be seen in both the dynamic increase in its zoogeographical range, and in its effective adaptation to ecological niches in new areas. The driving forces of this phenomenon include intensification and globalization of mink farming, which is accompanied by introduction and rapid spread of the species outside its natural range. The first observations of mink in the wild in Poland took place in the middle of the last century. Within 60 years, American mink colonized almost entire country and the process of invasion and colonization is still ongoing. The high rate of invasion and ecological success achieved by the populations from the introduction is possible due to the high ecological plasticity of American mink, its high reproductive potential, the availability of free ecological niche left by European mink (Mustela lutreola), extinct in many areas, and the frequent lack of natural enemies on the occupied territories. Dynamic geographical spread of allochthonous American mink is associated with a number of very serious ecological problems, primarily through predation, competition and aggression against indigenous fauna, as well as transmission of Aleutian mink disease virus. This results in fact that American mink is regarded as one of most dangerous invasive species in the world. In the absence of practical possibilities of its permanent eradication from Poland, local eradication programs on vulnerable areas (e.g. waterbirds breeding sites), as well as large−scale population size control, promotion of natural enemies and competitors, and improvement of living conditions of its prey−species are most recommended. The most important in monitoring and control programs of alien populations is limitation of farm−animals escapes and recognition of methods for their simple and unambiguous identification. Indisputable determination of the free−ranging animals origin would allow for taking the appropriate actions against owners of the unsafe farms. At the same time, implementation of a holistic and systemic approach to solve the problem of the presence of American mink in the natural environment would help to fulfil Polish obligations resulting from ratified international conventions and EU law.
EN
The aim of the study was a quantitative and cytoarchitectonic examination of neurons of the ventral hippocampal CA1-CA4 fields in somatically mature female American mink (Neovison vison) (N = 6). Brains were removed and examined under a light microscope. The samples were stained by Nissl’s standard method, and histological samples were used for morphometric analysis. All ventral hippocampal CA1-CA4 fields were analyzed cytoarchitectonically and morphometrically with a calibrated image analysis system that consisted of a computer equipped with the Cell^D software Soft Imaging System (SIS) with an integrated digital camera Colorview IIIu (Soft Imaging System). Morphometric investigations of the pyramidal layer showed that the cells of the hippocampal CA1-CA4 fields in adult female American mink differ in size, shape, cell area, nucleus area and the nucleus-to-cell ratio (in%). The cells of the CA2 field were densely arranged, pyramidal and contained a small amount of cytoplasm; their size was differentiated. They were the largest in size (15.06 μm) and diameter (14.5 μm). The cells of the CA1 field had the smallest size (8.5 μm) and diameter (8.6 μm). In the CA3 field, small, densely packed neurons dominated, whereas neurons in the CA4 field formed a thin strand of loosely arranged cells. Given the increasing interest in hippocampal areas, it is necessary to continue studies of their morphology and morphometry in healthy animals and in those suffering from neurodegenerative diseases.
PL
Materiał do badań stanowiły zwłoki dorosłych osobników, obu płci, w różnym wieku. Przebadano serca: 40 kotów domowych krótkowłosych (Felis silvestris f. catus), 50 norek amerykańskich (Neovison vison) i 23 nornic rudych (Myodes glareolus). Przeprowadzono preparację i morfometrię wyizolowanych serc. Określono: masę ciała zwierzęcia (BW), masę serca (HW), wysokość serca (H) i szerokość serca (W). Uzyskane dane posłużyły do wyliczenia udziału procentowego masy serca w stosunku do masy ciała (I1 ). Różnicę pomiędzy populacją samców i samic dla poszczególnych parametrów określano za pomocą testu NIR Fishera (w odniesieniu do kotów oraz norek), a także za pomocą testu U Manna-Whitneya (w odniesieniu do nornic rudych) przy poziomie istotności p≤0,05. U wszystkich osobników wysokość serca była większa od szerokości. Średnia wartość HW wyniosła 19,08 g dla kota domowego krótkowłosego; norki amerykańskiej 13,05 g; nornicy rudej 0,13 g. Natomiast średnia wartość I1 wyniosła: 0,59% dla kota domowego krótkowłosego; norki amerykańskiej 0,66%; nornicy rudej 0,70%.
EN
The study was performed on corpses of adult: 40 domestic shorthair cats (Felis silvestris f. catus), 50 American minks (Neovison vison) and 23 bank voles (Myodes glareolus) of both sexes and different age. The study material underwent an anatomical preparation and morphometric analysis of the hearts was performed. None of the hearts carried signs of macroscopic abnormalties or pathological changes. The following elements were determined: the body weight (BW), the heart weight (HW), the heart height (H) and the heart width (W). The data thus obtained were used to determined the percentage of the HW compared to the BW. The difference between the population of males and females for each of the parameters was determined by the Fisher’s LSD test (for cats and minks) and the U-Mann-Whitney test (for bank voles) and the significance level was P≤0.05. In the studied material the W of all specimens was greater than the H. The average HW amounted to: 19.08 g in domestic shorthair cat; 13.05 g in American mink; 0.13 g in bank vole. The average I1 amounted to: 0.59% in domestic shorthair cat; 0.66% in American mink; 0.70% in bank vole.
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