''Oesophagostomum'' is from the superfamily ''Strongyloidea''. The female is larger than the male at around 2cm in length. The family is characterized by a large buccal capsule, and has leaf crowns surrounding the mouth.
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*a typical strongyloid
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*found in the caecum and colon
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*approximately 1.5cm long
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*two major species but these are very similar
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*a periparturient egg-rise occurs, but this is not as constant as that seen in sheep
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*not very pathogenic, but large numbers depress milk production in sows and growth-rate in young pigs.
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'''The [[Thin Sow Syndrome]]'''
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==''O. radiatum''==
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'''NOTE''': ''[[Hyostrongylus rubidis|H. rubidis]]'' and ''Oesophagostomum'' species both produce typical [[Strongyles|strongyle]] eggs in faeces. ''H. rubidis'' is more pathogenic but produces few eggs, whereas ''Oesophagostomum'' species are prolific egg-layers but not very pathogenic. Care is therefore needed in interpreting egg-count data. Larval culture is needed to confirm presence of ''H. rubidis''.