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The studies were caried on in two consecutive years /1987 and 1988/. The cages of foxes from experimental group were blacked out by tarpaulin for two month/1st August - 30 September/. The animals from every litter were allocated to control and experimental group considering sex. The light’s tension in experimental pavilion not passed 26 - 32% in cloudy day and 40-48% in sunny day of value light's tension in control pavillion. The artificial abbreviation of daylight corrected category of coat, class and value of furs, as well as their furriery qualities /less weight of hide, less thickness of cover hair and increasing of underfur hair's height/. The blackout of cages advanced mature coat of foxes. In result the period of foxe's feeding was abbreviated about 12,4 - 15.9 days, food was spered and cost of work was less. The profil constituted 30% of fur's value in 1987 year and 17% - in 1988 year.
An attempt was made to predict the length of dry hides on the basis of body mass at the age of 12, 16 and 20 weeks, the body mass during the Autumn assessment /licence/, after slaughter, and the mass and length of humid hides of 74 males and 56 females of polar foxes. The authors indicated the influence of the litter, the origin and sex on the shaping of all examined characteristics of the animals and the influence of the time of birth on the body mass of 12 weeks old males and females and the mass of humid hides of females. Of the greatest cognitive value were equations assessing the length of dry hides made on the basis of measurements of body mass and the mass and length of humid hides. Although these equations were very exact they were of little practical value since they could not be used in the assessment of live animals. The exactness of equations assessing the length of dry hides only on the basis of measurements of body mass did not exceed of 74% accuracy of equations considering the body mass and the mass and length of humid hides. Such equations may be useful in practice because the standard error in assessing these equations does not exceed 3.0-3.2% of the length of dry hides. Measuring the body mass of 20 week-old males and measurements of the body mass of females during the Autumn licence made on the basis of live characteristics have been of the greatest significance in assessing the length of hides.
Litters born at approximate times, of a similar average mass of kits, was - after weaning and of a differentiated quantity /seven classes of litter numbers/ - allotted to four equally numbered groups /52 kits from seven whole litters/ with an equal number of males /23 animals/ and females /29/ in each group. The authors employed various methods in separating six-week old kits from their mothers. The method of weaning, the number of litters, the sex of kits and the separating term influenced the body weight on the 30th day after weaning at the age of 16 weeks and the size and body mass during the licence of polar foxes. Foxes disengaged during weaning and deprived of any contact with their mothers were most susceptible to stresses, while this effect was the least in kits left - after being separated from their mothers - in the cage of dam and maintaining during one month a complete visual auditory and olfactory contact with their mothers kept in an adjoining cage.
The aim of the study was to assess the usefulness of empathic test and feeding test to determine the type of arctic foxes females’ behaviour. The research material included females kept on a commercial farm situated in western part of the Wielkopolskie Voivodeship. The assessment of behaviour type of all the females from the foundation stock was conducted in 2002-2009 on the basis of behavioural reaction on empathic and feeding test. To determine the degree of balance and confidence of each animal taking part in both types of test, the basic test index Tl (1) and behavioural index Bl (2) were calculated. The feeding test appeared to be a more adequate tool for determination of behaviour type of arctic foxes when compared to empathic test, however it classified animals only to two groups (trustful and fearful).
The foxes cages from experimental group were blacked-out by tarpaulin for two consecutive months /from 1st August to 30th September/. In experimental and control groups were 3 undergroups: 1/ polish polar foxes, 2/ crosses with 50% genes of norwegian foxes /F₁/ and 3/ crosses with 25% genes of norwegian foxes /R₁/. The animals from every litter were allocated to both of group considering sex. The artificial abbreviation of daylight advantageously influenced on breeding's effectiveness of polish fox and crosses with norwegian fox. Economic effects showed profit 8.6% of crosses R₁ fur value as well as 21.7 % of polish foxes fur value and 20.4 % of crosses F₁ fur value.
In studies took into account 50 mothers and 229 puppies of silver fox as well as 45 mothers and 326 puppies of polar fox. The animals were allocated to 5 group depending on method of separation puppies from their mothers. Puppies from 1-3 groups were in pernament contact with mothers by sight, smell and hearing. The puppies from 1 and 4 groups were in maternal cages, the puppies from others groups were mooved far-off part of farm. Observations of animals behaviour /on 2 mother and their puppies from every group/ were made in weaning day and in two next days. The method of litter weaning effected the animals behaviour during and after the weaning, as well as their body weight, exterior and cover quality. The mother of polar fox the most responded to weaning of puppies. The every puppies of silver fox demonstrated clear yearning and anxiety.
Badania przeprowadzono w fermie lisów należącej do Rolniczego Kombinatu Spółdzielczego w Śniatach. Zakres czasowy badań obejmuje lata 1988-1990 oraz budowę modelu empirycznego w warunkach ekonomiczno-produkcyjnych 1994 roku. Materiały źródłowe pochodzą z bogatej dokumentacji materiałowej i finansowej fermy. W metodyce badań zastosowano 4 podstawowe metody, tj. metodę kalkulacyjną, analizy ekonomicznej pionowej, modelową i opisową. Badano opłacalność i rentowność produkcji w warunkach ryzyka ekonomicznego i produkcyjnego. Ryzyko ekonomiczne spowodowane było zwiększającym się ograniczeniem popytu na skóry i materiał hodowlany i relatywnym obniżaniem się cen. W 1988 roku sprzedano 3735 skór i lisów do chowu, w 1989 tylko 3278 sztuk, a w ostatnim roku zaledwie 2163 sztuki. W ostatnich dwóch latach w strukturze sprzedaży dominowały skóry. Rentowność produkcji w kolejnych latach badań obniżała się i charakteryzowała następującymi wskaźnikami: 43,8%, 32,5% i 6,5%. W modelu empirycznym dla 1994 roku wskaźnik rentowności wynosił 44,0%, co oznacza dostosowanie organizacji i produkcji do najbardziej korzystnych parametrów 1988 roku.
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