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Characteristics of hair coat in European bison

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Characteristics of hair coat in European bison. The subject matter of the study was to analyse chosen characteristics of hair coat of 40 E. bison (living in the Białowieża and Borecka forests), representing two age groups. Hair samples were collected in winter from the middle part of the animals’ abdomen. They were used to determine the share of the hair fraction, the thickness within a fraction, the features of hair surface and its diameter. Hair fractions (down and medullated) were distinguished on the basis of differences in the hair length. The share of a fraction was determined according to the quantity of fibres within a fraction. The thickness of the fibre was measured by microprojection. Anatomical structure of hair was analysed on the basis of images from a scanning electron microscope. The studied hair coat showed predominance of the down fraction, i.e. thin, woolly, non-medullated hair. Its average share was higher in young E. bison(P≤0.05) where it amounted to 73.41%, whereas in older animals it represented 65.50%. Higher share of down fraction in the fur of young animals was correlated with smaller hair diameter – both in down fraction and in the whole hair coat – namely 26.67 µm and 32.78 µm, respectively. Fibre diameter in the fur of mature animals was larger – 50.12 µm on average – i.e. 39.19 µm in the down fraction which proved perfectly even in terms of hair thickness and 91.71 µm in the medullated fraction. Animals representing the two age groups showed differences in the thickness of down fraction, medullated fraction as well as hair coat in general (P≤0.01). Discrepancies of hair thickness in young animals are worth noting. The presence of the core was observed in the long and thick guard hair (in 41.38% of it). The fibres featured predominantly continuous medulla (64.2 %). Differences between down and guard hair were observed also in the structure of cuticle.
The aim of this study was an analysis of the factors that influence body size and hair coat quality of standard minks (Mustela vison Sch.). The analysis covered 3837 animals belonging to three genetic groups: one domestic (native) and two groups of half–imports (one of the parents, sire, imported from Denmark or Holland).
The aim of the study was to investigate into the possibility of evaluating arctic fox fur basing on the correlation of laboratory measurements of hairs collected from various parts of the coat. The material involved samples of prime fur hairs of 20 two-year-old females of the blue arctic fox, collected at the end of January. The samples were cut by the skin at six places of the body, namely: the head (between the ears), back (in the middle between the tail base and the neck base), the side (below the place of sampling located on the back), belly (mid between the base of the front limbs and the vulva), the tail (in the middle of the dorsal side), as well as the shank. The samples were subjected to macro- and microscopic measurements. The results indicate that fur coat of arctic foxes is more dense, longer, and usually more intensely colored on the back, as compared to the belly. The hairs on the head and the limbs are much shorter and contain more awn hairs. The results reveal a very weak correlation of the morphological fur characteristics between different parts of the body. It has been found that it is impossible to objectively evaluate the basic structural characteristics and the dark tops of hairs in the arctic fox on the basis of a sample of hair from a single part of the body.
The hair density of adult Eurasian otters Lutra lutra (Linnaeus, 1758) and sea otters Enhydra lutris (Linnaeus, 1758) was analysed using skin samples taken from frozen carcasses. Lutra lutra exhibited a mean hair density of about 70 000 hairs/cm2 (whole body, appendages excepted), the mean individual density ranging from about 60 000 to 80 000 hairs/cm2. The dominant hair type were secondary hairs (wool hairs), the hair coat comprising only 1.26% of primary hairs (PH). Secondary hair (SH) density remained constant over the body (appendages excepted), whereas a few variations in PH density were observed. Neither an influence of the sex, nor a seasonal variation of the hair coat was found, moulting seems to be continuous. Enhydra lutris had a hair density between 120 000 and 140 000 hairs/cm2, the primary hairs representing less than 1% within the hair coat. Hair density remained quite constant over the regions of the trunk but was lower at the head (about 60 000 hairs/cm2 on the cheek). The hair follicles were arranged in specific groups with different bundles of varying size, normally comprising dominant numbers of wool hair (SH) follicles. Invariably there was always a large central primary hair follicle and numerous sebaceous glands between the bundles and principally around the PH follicles. The results are discussed related to possible ecological influences on hair coat density.
Skin and hair samples taken from seven body areas of a winter hair coat of a male and a female yearling white-tailed deer Odocoileus virginianus Zimmerman, 1780 were investigated morphologically. The color, length, diameter, density and relative proportion of guard and wooly hair was determined from the histological sections. In addition, the epidermal thickness, and the shape, density, location and structure of sebaceous and sudoriferous glands were also determined .A reciprocal relationship was found between the insulation values of the pelage, the epidermal thickness and the amount of either gland. The areas known to provide the best insulation (the tail and the belly) exhibited the thinnest epidermis, the highest density of hair and the highest concentration of sebaceous glands. In reverse, the region with the lowest insulation capacity (the leg) exhibits the thickest epidermis, the lowest hair density and the highest amount of sudoriferous glands.
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