Studies on Ostertagia spp. from Greenlandic sheep: arrested development and worm length

Jacobs, D.E.; Rose, C.H.

Acta Veterinaria Scandinavica 31(3): 333-337

1990


ISSN/ISBN: 0044-605X
PMID: 2080777
Document Number: 366471
Studies were conducted to investigate earlier observations that lambs slaughtered in Greenland in late September/early October have relatively few arrested larvae in the abomasal mucosa and that the adult Ostertagia [Teladorsagia circumcincta and T. trifurcata] from such lambs are abnormally large. Post mortem examination of naturally infected ewes in mid-winter demonstrated that a significant proportion of their Ostertagia population was hypobiotic at this time of year, while an experimental study showed that considerable numbers of larvae of Greenlandic origin became arrested following cold conditioning for 10 weeks. A comparison of adult Ostertagia of Greenlandic and British origin from lambs experimentally infected with larvae cultured under identical conditions demonstrated that the "giant" size of the arctic worms was attributed mainly to environmental rather than genetic influences.

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