Ograniczanie wyników

Czasopisma help
Autorzy help
Lata help
Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 48

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 3 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  Arctic fox
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 3 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
The studies aimed to evaluate the pathomorphological changes induced by various management conditions in arctic foxes. Healthy pups aged about eight weeks were randomly assigned to two groups, 20 animals each. The foxes of the control group were housed on a farm, while the experimental group comprised of foxes raised in a confined space. Throughout the rearing period, air quality monitoring of the environment of both groups was performed. During the autumn slaughter (the experiment lasted for 7 months), sections of the liver, kidneys, lungs, ovaries, and uterus obtained from all the foxes were evaluated pathomorphologically. Pathological changes were observed in lung sections collected from the animals of the experimental group. During the air monitoring, higher concentrations of pollutants were identified in the experimental group environment.
Immunogenicity of six strains of Trichophyton mentagrophytes var. granulosum isolated from arctic foxes with ringworm was evaluated in guinea pigs and foxes. Two strains of T. mentagrophytes (Tm-3 and Tm-4) out of six examined (Tm- 1, Tm-2, Tm-3, Tm-4, Tm-5 and Tm-6) induced in the experimental foxes a strong cellular immune response measured by the leukocyte migration inhibition test (LMIT), lymphocyte transformation test (LTT), and by skin delayed-type hypersensitivity (DTH). The guinea pigs immunised with Tm-3 and Tm-4 were well protected against the artificial infection with the virulent strain of T. mentagrophytes (Tm-9). These two strains of T. mentagrophytes with high immunogenic properties were used for production of a vaccine against ringworm in foxes.
Main genes determining white coat colour in Arctic foxes are: recessive gene d and incompletely dominant, autosomal gene S with lethal effect in homozygous condition. The white coat colour of Arctic foxes bred on Polish farms had been determined solely by the recessive gene until the 1970s, when the Shadow variety was imported from Norway. The genetic code of the two varieties was different, but this fact was not taken into account. The results obtained in the present study do not confirm the theories on the heredity of white coat colour of Arctic foxes. The authors of these theories assumed that the coat colour depends on the presence of a recessive gene, the only factor responsible for the white furcoat. Apart from Polar and Shadow white foxes, there is a wide variety of darker white animals, and this fact suggests that there is a number of cumulative genes responsible for the intensity of coat pigmentation.
The aim of the study was to determine the effect of feed ration with a variable content of carbohydrates on the production performance of blue arctic fox. The research included 60 blue arctic foxes which were divided into two groups: experimental (30 individuals) and control (30 individuals). The experimental group, compared to the control group, was fed with a ration with a higher level of carbohydrates, whose source were ground grains (ground barley and wheat) as well as dried beet pulp. The experiment lasted from weaning of the pups until the day when the foxes were slaughtered (29 week). Based on control weighing (at the beginning of the experiment, at 17 and 29 weeks of age) the average body weight was calculated (in kg), as well as the total (in kg) and daily (in g) body weight gain. The average final body weight of foxes in both groups was similar, and ranged from 15.67 kg (control group) to 16.20 kg (experimental group). Males were characterized by a slightly higher body weight than females (however, these differences were not confirmed statistically). In the experimental group the total and daily body weight gains during growth were higher, and during the fur growth period they were lower compared with the control group. The use of rations with an increased proportion of carbohydrates in the arctic fox nutrition, whose source were extruded ground grains and dried beet pulp, did not negatively affect on selected of the production performance of foxes over the whole experimental period compared with the control group.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 3 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.