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Research
(Published
online: 29-03-2014)
15. Histological characteristics of hair
follicle pattern in Indian bison (Bos gaurus), Black buck
(Antelope cervicapra) and Nilgai (Boselaphus tragocamelus)
- Y. B. Shambhulingappa, R.V .Prasad, K. V. Jamuna, H. D.
Narayanaswamy, M. Narayana Bhat and V . Ramkrishna
Veterinary World, 7(3): 189-193
doi:
10.14202/vetworld.2014.189-193
Abstract
Background and Aim: Indian
bison, Black buck and Nilgai are in danger of extinction because
people are hunting them for their meat and horns for sports,
trophies etc. These animals are also protected under International
Union for Conservation of Nature and Natural Resources (IUCN) and
Conservation on International trade in Endangered Species of Wild
Fauna and Flora (CITES). Taking note of the vulnerability of these
animals to extinction, we characterized the hair follicle pattern
of these animals for future reference. This study included a total
of 30 skin samples comprised of 8 samples of bison, 10 samples of
black buck and 12 samples of nilgai.
Materials and Methods: Skin samples were obtained from Sri
Jayachamarajendra Zoological Park, Mysore, Karnataka, India and
Bannerghatta Biological Park, Bangalore, Karnataka, India and also
from confiscated skins from forest and police officials of
Karnataka. The skin samples were processed and horizontal section
of 6-7 μm thickness was used for the routine histological
technique using different special staining techniques. Observation
such as hair follicle pattern, sebaceous glands and sweat glands
distribution, blood vessels, nerve fibre, collagen and elastic
fibres were noted.
Results: In the bison, compound hair follicles were
uniformly distributed and were rectangular in shape comprising of
a primary hair follicle associated with 3-4 secondary hair
follicles in addition to their sebaceous glands. Uniformly
distributed coiled tubular sweat glands were also noticed which
were lined by simple cuboidal epithelium. In the black buck, the
compound hair follicles were densely distributed and were arranged
linearly in the dermis of skin. Within the compound follicle,
linear arrangements of primary and secondary follicles were
observed. Each primary hair follicle was supported by 2-4
secondary hair follicles and the primary hair follicle was always
present at the centre when it was present with 2 secondary hair
follicles. In nilgai, the compound hair follicles were densely
distributed in the dermis of skin. The primary hair follicles were
bilaterally surrounded by 2-3 secondary hair follicles. Each
primary and secondary hair follicle was associated with sebaceous
glands.
Conclusion: The histological pattern of the hair follicle
data was established and the hair follicle pattern will be of use
in the identification of the wild ruminant skins which are
commonly poached by the poachers. It will also be useful to
compare the histological characteristics amongst the wild
ruminants.
Keywords: biological park, hair follicle, sebaceous glands,
sweat glands, wild ruminants.
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