Influence of annual rainfall on epidemiology of gastrointestinal parasites in sheep flocks of Rajasthan
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https://doi.org/10.56093/ijans.v84i11.44701
Keywords:
Epidemiology, Field flocks, Gastrointestinal parasites, Rainfall, Sheep, RajasthanAbstract
The translation of exogenous stages of gastrointestinal (GI) parasites varies according to climatic variables like temperature, rainfall and humidity. The present paper describes the influence of quantum of annual rainfall on the prevalence and intensity of GI parasites in field flocks of sheep in Rajasthan. The period of 9 years (2004–13) was divided in 3 categories as years with above normal, normal and below normal annual total rainfall (TRF). Faecal samples (59,398) were subjected to qualitative and quantitative evaluation and data on monthly incidence and intensity were analyzed according to categories of years. The effect of annual TRF was significant on incidence of strongyle worms for all the months except during June in semi-arid and April in arid region. During August to December (favourable season), it was higher in the years with below normal TRF in semi-arid and in the years with normal annual TRF in arid region. The incidence of Trichuris spp, Strongyloides papillosus, Fasciola gigantica and Schistosoma indicum was very low. Incidence of S. papillosus was higher in the years of normal annual TRF in semi-arid region only. The incidence of Amphistomes remained lowest in the years of normal annual TRF. Higher annual TRF resulted in lower monthly incidence of Moneizia infection. The intensity of strongyle infection for all the months was significantly lower in years with above normal annual TRF in semi-arid region however similar influence was noticed only for July and August in arid region. It was inferred that moderate flexibility in single drench schedule according to magnitude of annual rainfall effectively managed the GI nematodes in field flocks of Rajasthan. However, a different strategy is required to formulate for management of flukes depending on quantum of rainfall, availability of water reservoirs and water resources for flocks.
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References
Armour J. 1980. The epidemiology of helminth disease in farm animals. Veterinary Parasitology 6: 7–46. DOI: https://doi.org/10.1016/0304-4017(80)90037-0
Gupta R P, Yadav C L and Choudhri S S. 1987. Epidemiology of gastrointestinal nematodes of sheep and goat in Haryana, India. Veterinary Parasitology 24: 117–27. DOI: https://doi.org/10.1016/0304-4017(87)90136-1
MAFF. 1984. Manual of Veterinary Investigation. Vol. 2, pp 161–87. Reference Book 390, Her Majesty’s Stationary Office, London.
Morgana E R and Dijk J van. 2012. Climate and the epidemiology of gastrointestinal nematode infections of sheep in Europe. Veterinary Parasitology 189: 8–14. DOI: https://doi.org/10.1016/j.vetpar.2012.03.028
O’Connor L J, Walkden-Brown S W and Kahn L P. 2006. Ecology of the free-living stages of major trichostrongylid parasites of sheep. Veterinary Parasitology 142: 1–15. DOI: https://doi.org/10.1016/j.vetpar.2006.08.035
Okaiyeto S O, Tekdek L B, Sackey A K B and Ajanusi O J. 2008. A survey of gastrointestinal parasites of nomadic sheep in eight local government areas of northern Nigeria. Research Journal of Animal Sciences 2: 92–95.
Singh D, Swarnkar C P, Prince L L L and Pathak K M L. 2011. Economic Analysis and Impact of Gastrointestinal Nematodes on Sheep Production in Rajasthan. Directorate of Knowledge Management in Agriculture, Indian Council of Agricultural Research, New Delhi, pp 1–84.
Sissay M M, Uggla A and Waller P J. 2007. Epidemiology and seasonal dynamics of gastrointestinal nematode infections of sheep in semi-arid region of eastern Ethiopia. Veterinary Parasitology 143: 311–21. DOI: https://doi.org/10.1016/j.vetpar.2006.08.026
Soulsby E J L. 1965. Textbook of Veterinary Clinical Parasitology. Vol. I, pp 279–305. Helminths. Blackwell Scientific Publication, Oxford, UK.
Swarnkar C P and Singh D. 2011. Role of bioclimatographs in forecasting of strongyle infection in Rajasthan. Indian Journal of Animal Sciences 81: 216–23.
Swarnkar C P, Singh D, Krishna Lal and Khan F A. 2008. Epidemiology and Management of Gastrointestinal Parasites of Sheep Flocks in Rajasthan. Central Sheep and Wool Research Institute, Avikanagar pp. 1–145.
Torres-Acosta J F J and Hoste H. 2008. Alternative or improved methods to limit gastro-intestinal parasitism in grazing sheep and goats. Small Ruminant Research 77: 159–73. DOI: https://doi.org/10.1016/j.smallrumres.2008.03.009
Tripathi J C. 1977. Effect of different temperatures on infective larvae of Haemonchus contortus under laboratory conditions. Indian Journal of Animal Sciences 44: 104–08.
Urquhart G M, Armour J, Duncan J L, Dunn A M and Jennings F W. 1994. Veterinary Parasitology. 1st edn. Singapore, Longmann.
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