The epidemiology of
gastrointestinal parasitism and body condition in free-ranging herbivores
SomeshSingh ¹, A.B. Shrivastav ²
& R.K. Sharma 3
¹ Department of Forest
Biology and Wildlife Science, College of Forestry and Environment,
Allahabad Agricultural Institute - Deemed University, Allahabad, Uttar Pradesh
211007, India
² Department of Wildlife Health and Management, College of
Veterinary Science and Animal Husbandry, Jabalpur, Madhya Pradesh 482001, India
3 Department of Veterinary Parasitology,
College of Veterinary Science and Animal Husbandry, Jabalpur, Madhya Pradesh 482001,
India
Email:1 somesh_wlvet@yahoo.co.in
Date of publication (online): 26
October 2009
Date of publication (print): 26
October 2009
ISSN 0974-7907 (online) |
0974-7893 (print)
Editor: Jacob V. Cheeran
Manuscript details:
Ms # o1779
Received 19 May 2007
Final received 05 July 2009
Finally accepted 16 September
2009
Citation: Singh, S., A.B.Shrivastav & R.K. Sharma (2009). The epidemiology of gastrointestinal parasitism and body condition
in free-ranging herbivores. Journal of Threatened Taxa1(10): 535-537.
Copyright: © Somesh Singh, A.B. Shrivastav& R.K. Sharma 2009. Creative Commons Attribution 3.0 UnportedLicense. JoTT allows unrestricted use of this article
in any medium for non-profit purposes, reproduction and distribution by
providing adequate credit to the authors and the source of publication.
Acknowledgement:The
authors are thankful to the Dean, College of Veterinary Science and Animal
Husbandry, Jabalpur for providing all possible facilities to this study; to the
Director and entire staff of Van Vihar National Park
for the generous help and cooperation; to all the staff members of the
Department of Wildlife Health and Management and Veterinary Parasitology,
College of Veterinary Science & Animal Husbandry, Jabalpur for their help
during the entire period of study.
For Images & Table – click
here
India
is rich in unique and diverse wildlife. A number of factors threaten the existence of wild animals in this
country, including wildlife diseases and disorders arising from
gastrointestinal parasites. The
diagnosis of these parasites can be made by faecalsample examination. The physical status
and health of wild animals can be judged by evaluation of their body condition,
which can be done from a safe distance without disturbing the animals.
The
present work was planned to study the prevalence of gastrointestinal parasitic
infections, assess pasture contamination by infective parasitic stages, judge
body condition of free ranging wild herbivores; Chital or Spotted Deer (Axisaxis), Sambar (Rusa unicolor) and Nilgai or Blue Bull (Boselaphus tragocamelus) and study general condition and
management practices in the Van Vihar National Park,
Bhopal. The Park lies at the eastern bank
of Bhopal big lake. The big lake thus
affects the local micro climate of this area by lowering temperature 1 to 1.50C. The area therefore is relatively more humid
than other areas of the town. The annual
average temperature recorded so far was 25.1°C. The average rainfall of the area was 1128.9mm. The animals are present in free range as well
as managed in captivity, giving it the status of both National Park and Zoological
Park (Chandra et al. 2000). Free ranging
animals include Chital, Sambar, Nilgai,
Jackal, Wild Boar, common langur etc., whereas the
captive animals are Black Buck, Chinkara, tiger,
lion, leopard, Striped Hyaena, Sloth Bear etc.
Methods
The present
study was carried out for a period of one year (2005-06) in three distinct
seasons i.e. winter (November to February), summer (March to June) and rainy
(July to October). It was comprised of faecal sample
analysis, evaluation of body condition of free ranging herbivores and study
general condition and management practices in the park.
Analysis
of faecal samples - About 5-20 g of freshly laid faecal samples were collected in interlocked
polythene bags. Additionally, a small part of the same faecalsample was collected in plastic collection bottles containing 10% formalin. Thefaecal samples collected in polythene bags were
refrigerated until examination. The
samples were examined on the basis of qualitative and quantitative estimation
techniques. Qualitative estimation was
made by Sheather’s sugar flotation technique to
screen the nematode eggs and protozoan oocysts, and afaecal sediment technique to screen fluke eggs (Sloss et al. 1994). Quantitative estimation was done by employing the Modified McMaster egg
counting technique to determine nematode eggs/coccidia oocysts per gram (EPG/OPG), and Stoll’s dilution
technique to determine fluke eggs per gram (EPG) of faeces(Soulsby 1982).
Body condition
evaluation - Body condition of animals was evaluated on point scale as
suggested by Riney (1960) and modified by Shrivastav & Sharma (2000).
Study related to
general condition and management practices in the park was done by direct
observation and from secondary sources.
Data were
subjected to standard statistical analysis to calculate mean, standard
deviation and standard error (Snedecor & Cochran
1967).
Result
and Discussion
The overall rate of parasitic prevalence
was 38.17% (Table 1). The moderate temperature range and more humidity
conditions of the Park might have induced the ‘mat’ formation between the soil
and the herbage favorable to the survival of eggs and free-living stages of
parasites. This can be further
supported by the findings of Mondal et al. (2000),
who documented that grasslands are one of the main sources of gastrointestinal
parasitic diseases to animals. The parasitic prevalence was highest (39.45%) inSambar, followed by Chital (38.19%) and Nilgai (36.84%) (Table 1). Sambar take to
water readily and swim with the body submerged, which might have exposed them
to infective stages of parasites leading to higher parasitic prevalence in the
species. The highest prevalence was
recorded for strongyles (26.15%) followed by Strongyloides sp. (7.13%), coccidia (6.20%), Fasciolasp. (2.64%), amphistomes (1.98%) and Trichuris sp. (1.84%) (Image 1). Chakraborty &
Islam (1996) performed study in wild herbivores at KazirangaNational Park and recovered the eggs of strongyles,Strongyloides sp., Ascaris,Paramphistomum, Fasciolaand oocyst of coccidia.
Gaur et al. (1979) recorded maximum prevalence of strongyles(20.25%), followed by Fasciola sp.
(16.46%), Strongyloides sp. (15.19%) and amphistomes (12.66%) at Corbett National Park. Mandal et al.
(2002) also reported maximum infection of strongyles(41.67%), followed by amphistomes (15.63%), Fasciola sp. (13.54%), Strongyloides sp. (11.46%) and Ascaris sp. (5.29%) in
wild herbivores at Mudumalai Wildlife Sanctuary.
During the present survey the prevalence
of trematodes (Fasciolasp. and amphistomes) was recorded to be comparatively
lesser than reported by other workers (Gaur et al. 1979; Chakraborty & Islam 1996; Mandalet al. 2002). The variation in
topography of the Protected Area appears to influence the rate of
prevalence. The aforementioned studies
were conducted in hillocks and swampy meadows, where the snail
population which serves as intermediate host for flukes is abundant around
natural water sources, facilitating higher concentration of metacercaria,
the infective stage. The prevalence of
parasitic infection in all the three species was highest in the rainy season,
followed by winter and summer. The
findings are in accordance with Modi et al. (1997),
and Kumar & Rao (2003) who also documented
maximum prevalence (51.9% & 46.59%, respectively) in wild animals during
the rainy season. The higher rate of
prevalence during the rainy season is due to the existence of a suitable
microclimate for the survival and propagation of free-living larval stages of
parasites at several places. The
parasitic ova, snails and other intermediate host get a favorable humid
sub-tropic climate for development in the plane grazing areas with shallow
temporary stagnated water. The animals
congregate at the greens available around the periphery of such areas and
naturally acquire more infection. The
overall mean EPG was maximum for strongyles (585.19)
followed by Trichuris (410), amphistomes (250), Strongyloides(127.78) and Fasciola (111.19). Overall mean OPG for coccidiawas 1655. The Sambarshowed maximum load for the parasitic eggs of strongyles(666.67±66.67), Strongyloides (133.33±47.14),Trichuris (500±100), amphistome(300±57.74) and coccidia (1990.00±99.24). Only Fasciolaeggs were maximum (128.57±28.57) in Nilgai (Table
2). The findings indicated high pasture
contamination by various parasites.
The body condition evaluation revealed
42.22% animals in good, 41.11% in average and 16.67% in poor body condition.
Species-wise percentage of animals in good body condition was maximum for Nilgai (46.67%) followed by Chital (43.33%) and Sambar (36.67%) (Table 3).
The factors which affect development and
survival of infective stages are mainly environmental, especially seasonal
climatic change and management practices (Urquhart et al. 1996). The number of free ranging animals at Van Vihar National Park was more and scarcity of natural
foodstuffs was seen during the summer season. This was inducing the animals to graze closer to faecesthan otherwise, enhancing the chances of acquiring infective stages. The more number of animals was further hastening
the spread of infective parasitic stages among them. Overgrazing of palatable grasses; resulted in
faster development of obnoxious weeds i.e. Partheniumand Lantana. The ungulates were observed
consuming these weeds. The green fodder, wheat straw, gram husk, mineral and
licks were supplemented to cope with stressful atmospheric conditions (Chandra
et al. 2000).
The Nilgaiwere in far better body condition in comparison to Chital and Sambar. The lower
parasitic load, ability to sustain stressful conditions and lower number of Nilgai might be the reason for their good physical
condition. In contrast, a higher
parasitic prevalence and population along with other incompatible conditions
might have resulted in the lowered body condition in Chital and Sambar.
The chances of acquiring parasitic
infection around waterholes can be controlled by suitable physical, chemical
and biological methods. Rotational
cropping of pastures can reduce the influence of mat formation and therefore
parasitic survival. Use of regular
pasture and habitat improvement along with rotational grazing practices may be
followed to improve host nutrition and help maintain their resistance to
parasitism in a natural manner. Large
scale eradication of the weeds should be carried out on a priority basis.
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