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Animal Waste, Water Quality and Human Health

Animal Waste, Water Quality and Human Health

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162<strong>Animal</strong> <strong>Waste</strong>, <strong>Water</strong> <strong>Quality</strong> <strong>and</strong> <strong>Human</strong> <strong>Health</strong>The mean concentration of Cryptosporidium oocysts in animal faeces is shownin Table 5.2. The highest mean concentration of Cryptosporidium oocystsexcreted per gram of animal faeces was found for juvenile cattle (mean = 38115,n = 4), squirrels (mean = 27000, n = 2), rodents (mean = 25250, n = 4) <strong>and</strong>juvenile sheep faeces (mean = 9135, n = 2), respectively. The most numerousstudies on Cryptosporidium oocyst prevalence in animal faeces have been carriedout on domestic livestock animals, cattle <strong>and</strong> sheep. These studies were pooledfor adult <strong>and</strong> juvenile animals to enable comparison of geographical regions(Figures 5.2 <strong>and</strong> 5.3).Table 5.2Concentration of Cryptosporidium oocysts in animal faeces.Ranking <strong>Animal</strong> Age n* Meanconcentration/gMedianconcentration/g1 Cattle juvenile 4 38115 225002 Squirrels adult 2 27000 270003 Rodents adult 4 25250 270004 Sheep juvenile 2 9135 91355 Cattle adult 12 3830 46.256 Hedgehogs adult 1 3000 30007 Badgers adult 1 3000 30008 Bison adult 1 2369 23699 Poultry adult 1 2100 210010 Rabbits adult 2 2100 210011 Deer adult 3 2004 300012 Elk adult 2 1871 187113 Fox adult 2 1500 150014 Horses adult 2 1033.5 1033.515 Sheep adult 5 780.4 8816 Beavers adult 1 509 50917 Pigs juvenile 1 472 47218 Kangaroos adult 1 204 20419 Pigs adult 3 24.1 14.320 Geese adult 1 0 0*Number of published studies (not the number of samples analysed).The majority of studies of Cryptosporidium oocyst prevalence rates in cattlehave been carried out in either Europe or North America with fewer studies inAustralasia (Figure 5.3). Sporadic high rates of prevalence (>70%) were

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