Abstract
Chronic fluorotoxicosis in the form of dental and skeletal fluorosis was observed in 443 immature and 2,155 mature domestic animals inhabiting tribal rural areas of southern Rajasthan, India. Their drinking water contained fluoride in the range between 3.1 and 6.1 ppm. These animals included cattle (Bos taurus), buffaloes (Bubalus bubalis), horse (Equus caballus), donkeys (Equus asinus), dromedary camels (Camelus dromedarius), sheep (Ovis aries) and goats (Capra hircus). Of these immature and mature animals 172 (38.8 %) and 826 (38.3 %) showed evidence of dental fluorosis with varying grades, respectively. Their incisor teeth were bilaterally and vertically or horizontally brown to deep yellowish in colour. Also present, as indication of more severe dental fluorosis, were irregular wearing and excessive abrasions of teeth, deep yellowish discoloration of exposed cementum and/or remaining enamel surface and pronounced loss of teeth supporting bone with recession of gingiva. On clinical examination 12.1 % immature and 28.4 % mature animals revealed periosteal exostoses in mandibular regions, ribs, metacarpus and metatarsus, intermittent lameness, hoop deformities and stiffness of tendons in the legs as signs of severe skeletal fluorosis. In the fluorosed animals other signs of chronic fluoride intoxication as colic, intermittent diarrhoea, excessive urination, irregular reproductive cycles, repeated abortions, sterility and still birth were seen. No significant variation in prevalence of dental fluorosis was found between mature and immature animals. However, mature animals showed relatively higher (28.4 %) prevalence of skeletal fluorosis as compared to their counterparts (12.1 %). Among these animal species, buffaloes revealed the maximum prevalence of dental (96.8 %) and skeletal (66.9 %) fluorosis and minimum of 17.02 and 8.7 %, respectively, was observed in goats. However, prevalence and severity of osteo-dental fluorosis greatly varied from species to species and between grass-eaters or grazers (cattle, buffaloes and equines) and plant-eaters or browsers (camels and flocks). Causes for variation in prevalence and severity of fluoride toxicity in different species and between animals of different feeding habits are discussed.
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Acknowledgments
Author thanks the University Grants Commission, New Delhi, India for financial assistance {No. 34-466/2008 (SR), dated 29th December 2008}. Author is also thankful to Dr. G. V. Mishra, Head of Zoology Department, Government Girls College, Dungarpur for statistical analysis of data and Dr. Zulfiya Sheikh (Assistant Professor of Zoology), V. J. Jaroli (Research Assistant) and Dr. B. Bhardwaj (Senior Veterinary Officer) for their cooperation.
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Choubisa, S.L. Fluorotoxicosis in Diverse Species of Domestic Animals Inhabiting Areas with High Fluoride in Drinking Water of Rajasthan, India. Proc. Natl. Acad. Sci., India, Sect. B Biol. Sci. 83, 317–321 (2013). https://doi.org/10.1007/s40011-012-0138-6
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DOI: https://doi.org/10.1007/s40011-012-0138-6