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Nucleic acid content in different tissues in the freshwater fish N.notopterus in relation to sex was studied during Pre-spawning phase of the reproductive cycle. The fish were scarified and the tissues such as brain, liver, kidney and gonads removed and processed for determination of nucleic acids. It is observed that the nucleic acid content in different tissues of female fish has lower values than males. The results obtained in the present study may provide a contribution to the knowledge of the characteristics of nucleic acid as parameters of sexing the fish. The study also indicates that although male fish have higher values than female fish, both the sexes are biochemically and nutritionally better.
Group-living animals may need to spend less time being vigilant, consequently, having more time for other important activities such as foraging (i.e., group size effect). Przewalski’s gazelle (Procapra przewalskii) is a group-living social animal, and a study was conducted in Qinghai Province of China during June–August 2006 by using a continuous focal sampling method to investigate the influences of group size, sex, within-group spatial position, and nearest-neighbor distance on individual vigilance level (defined as scanning frequency per minute). Male gazelles were more vigilant than females. The gazelle’s vigilance level decreased with group size (group size effect), but only for females. The individuals at the central positions within a group were less vigilant than those at the peripheral positions, but the nearest-neighbor distance did not have any significant influence on the individual vigilance level. Our results support the hypotheses of group size effect and edge effects, but the sexual difference in vigilance level and in the response to group size effect on vigilance suggests that there may be sexual difference in the function and targets of vigilance behavior of Przewalski’s gazelles, which warrants more investigation, with incorporation of within-group spatial position, to better understand the mechanism underlying the group size effect and edge effect.
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The criteria for choosing a companion dog

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The criteria for choosing a companion dog. What criteria do people follow in selecting a dog in Poland? By means of a diagnostic survey a study was carried out examining the criteria for selecting a companion dog. The survey was filled out by 424 dog owners (in Poland), representing various ages and education. An analysis of the results allowed to divide the surveyed community into five clusters. The respondents from the 1st cluster preferred pedigree dogs. They regarded the most important criteria of dog selection to be parentage (0.809), size (0.652) and temperament(0.478). The 2nd cluster included people having a good contact with dogs and preferring a specific type of dog temperament. They most highly regarded the temperamentof the dog (1.000) and its appearance (0.693). The 3rd cluster included altruists, for whom none of the analyzed criteria of selection were important. For them the most important criteria of dog selection was the temperamentof the animal (0.977), less important were sex (0.593), parentage (0.558) and the utility purpose (0.453), whereas age and external appearance were completely irrelevant. The respondents in the 4th cluster (people preferring work and physical activity with the dog) differed from the others by having the highest assessment of the dog's utility purpose (0.906). Their utilitarian attitude towards dog selection confirms regarding temperamentas second in the hierarchy of criteria (0.750) and size as the third (0.547). The least traits associated with the utilitarian side of the dog were shown by respondents from the 5th cluster (average dog owners). They regarded the following criteria to be most important: size (0.688), age and appearance (0.656) and sex (0.563).
Background. Eating behaviours play a key role in lives of young people who stay physically active. They influence both their correct development and performance. Objective. Evaluation of selected eating behaviours of girls and boys attending sport-oriented classes and identification of differences between eating behaviours of studied groups. Materials and Methods. 460 students attending sport-oriented classes in Poland participated in the study. A questionnaire prepared by the author of the study was the research tool. The data was gathered in Microsoft Office Excel 2010 worksheet. Statistical analysis was made with the use of StatSoft, Inc. Statistica version 10.0. Results. The questioned students most often had 4-5 meals a day- such an answer was given by 59.09% of the boys and 41.38% of the girls. 55.59% and 41.95% of them respectively had breakfast within 30 minutes from waking up and 41,96% of the girls and 39.51% of the boys had supper 2-3 hours before going to sleep. Whole meal bread and/or groats were most frequently consumed a few times a day as it was declared by 50.35% of the boys and 45.98% of the girls. The highest percentage of the respondents consumed vegetables at least once a day (31.61% of the girls and 31.47% of the boys). 44.83% of the girls and 40.9% of the boys declared eating fruit a few times a day. Conclusions. Studied eating behaviours of girls and boys in sport-oriented classes are largely wrong and require correction. The analysis of the gathered data indicated statistically significant differences between boys’ and girls’ eating behaviours, however, the boys’ habits were better.
The experimental material included grey partridges Perdix perdix planned for re-introduction into the natural habitat, reared at the Center of Game Breeding on the area of Mazovia Province. 10 hens and 10 roosters were selected for slaughter. After exsanguination, plucking and evisceration, the birds were cooled for 24 h to a temperature of 4°C. The carcasses were subjected to dissection to enable determination of dressing percentage and calculation in the carcass contents of: breast muscles, leg muscles, adipose fat and giblets. The study showed no effect of sex on results of slaughter analysis of grey partridge.
Alpacas are known worldly for their very fine, luxurious fiber which is three times more hardy and six times more thermal than sheep fiber. Aside from fiber, alpacas are also bred for meat and used in the tourism and recreational industry and animal assisted therapy. Possibility of comprehensive use of these animals caused alpacas' popularity to grow immensely over the past few decades all over the world, also in Poland, where they adapted very well and have been bred since 2004. The objective of the analysis was to study the stocks of the Polish alpaca population, sex structure, also interesting was the inquiry of the distribution of various fleece colour. In Poland the majority of alpaca breedings are concentrated in voivodeships: Silesia, Podlasie and Wielkopolska. According to questionaire surveys carried out in 2012 on 9 farms, alpaca population in Poland numbers 651 and consists of: Suri (12%) and Huacaya (88%) which differ in coat type. In the surveyed population 86% consituted females and 14% males, in Suri population, 65% consituted females and 35% males. Alpaca fleece occurs in 22 natural colours, all shades of beige, brown and grey. Distribution of coat colour in the surveyed population, according to the method-oligically amended criterium was established as follows: white 58%, fair brown 12%, dark brown 9%, cream-coloured 6% and grey 6%, black 5%, multicoloured 4%. In the surveyed population of Huacaya alpacas the majority consituted white-couloured animals (63%), fair brown-coloured - 11%, dark brown-coloured - 8%, grey and black - 5% each, multicoloured - 3%. The Suri population was dominated by cream-coloured animals, whereas fair brown-coloured and dark brown-coloured cosituted 20% each, white-coloured - 12%, grey, black and mulitcoloured - 9% each. Results obtained can be considered satisfying compared with results obtained in Peru, where the biggest alpaca population is.
The study was aimed at determining the effect of flavour enhancers on the occurrence of sensory-specific satiety (SSS) phenomenon in young and elderly people of both sexes. Investigations involved a group of 60 subjects (30 young and 30 elderly ones, 15 women and men in each group) who rated the pleasantness of instant products with various sensory properties (pasta with Bolognese sauce, lemon gelatin dessert, fruit semolina) before and after ad libitum consumption of pasta with Bolognese sauce without and with the addition of flavour enhancers (sodium monoglutamate, sodium inosinate and a mixture of sodium inosinate and sodium guanylate). A significant effect (p<0.001) of age on the development of SSS was demonstrated in the study, yet only in the case of young people. The addition of flavour enhancers to pasta with Bolognese sauce intensified the occurrence of sensory-specific satiety, however that effect appeared to depend on the sex of the examined and was distinctly higher in women than in men. It was also demonstrated that in the elderly the feeling of satiety occurred at a relatively lower intake of pasta with Bolognese sauce as compared to the young people and the addition of flavour enhancers had no significant effect on the content of energy ingested with a meal in both sex groups.
This paper deals with normal values of some serum biochemical parameters in chickens and laying hens with regard to their age and sex. Investigations were performed on clinically healthy multipurpose birds of the Astra S race, both females and males aged 1-23 and 1-18 weeks, respectively. In serum of blood collected from the animals, levels of total protein, glucose, total cholesterol, triglycerides, calcium (Ca) and inorganic phosphorus as well as the activity of some enzymes including aspartate aminotransferase (AST), alkaline phosphatase (AP), lactate dehydrogenase (LDH) and creatine kinase (CK) were determined. In the birds of both sexes, some parameters were found to be age-dependent, including levels of total protein (increasing with age), cholesterol and triglycerides and CK activity (the highest levels were noted in 1-week old animals) as well as inorganic phosphorus and AP activity (decreasing with age). In the females beyond the 14th week of age, sex-dependent changes included an increase in levels of total protein, triglycerides and Ca as well as a higher level of phosphorus than that found in the males. No correlation between glucose level, AST, LDH activity, and the age and sex of the birds was observed.
Plumage bacteria might influence the trade-off between parental and self-preening efforts in birds, therefore affecting breeding success. However, too little is known about natural variation patterns in plumage bacterial communities for these hypotheses to be thoroughly assessed. We studied the density and phylotypic richness of plumage bacterial assemblages in wild breeding populations of Pied Flycatchers Ficedula hypoleuca and Great Tits Parus major in the same area and breeding season, using flow cytometry and ribosomal intergenic spacer analysis (RISA). The density of plumage bacteria was higher in Tits than in Flycatchers, providing evidence that bacterial microflora differs even between co-occurring hosts that share habitat, nest site and foraging preferences. It is concurrent with the finding that migratory birds might have lower bacterial loads than sedentary birds. In both species bacterial loads were higher in females than in males, which along with two earlier studies, indicates the generality of this sex pattern. A negative correlation between parental body mass and the richness of feather-degrading bacterial phylotypes was found in Pied Flycatchers. In Great Tits, higher bacterial densities in the plumage of parent birds were associated with the production of fewer fledglings. However, the causality of these associations remains to be tested experimentally.
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