Total and differential worm counts were carried out post mortem on sheep slaughtered at regular intervals at the Grootfontein College of Agriculture, Middelburg,
Fourth stage larvae were recovered at every autopsy. Usually the larvae exceeded
the number of adult worms in H. contortus and O. columbianum.
There was a positive correlation between faecal egg counts and adult worm
burdens of H. contortus and to a lesser extent O. columbianum and Trichostrongylus
Strategic dosing is recommended in April, September and December.
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