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Relationship Of Different Species Of Forage To The Survival And Infectivity Of Haemonchus Contortus In Lambs

Relationship Of Different Species Of Forage To The Survival And Infectivity Of Haemonchus Contortus In Lambs

Journal of Parasitology 50: 144-148

Third-stage Haemonchus contortus larvae that had been placed on outdoor forage plots in December survived overwinter and were ineffective for lambs the following May. The plots were 8 ft square and each consisted of one of the following species of forage: perennial ryegrass, velvet-grass, red clover, alsike clover, subterranean clover, and white clover. Four replicates of each forage species were used in the first experiment and six in the second. One helminth-free lamb grazed each plot for 18 consecutive days. All lambs contained adult Haemonchus at necropsy except the controls which had grazed on noninfested plots. Enough parasites were present in some animals to produce a significant decrease in their packed cell volume. Highest numbers (means) of adult worms were recovered from lambs which grazed white clover and subterranean clover. The grass groups contained the lowest numbers of parasites. These results suggest that greater numbers of third-stage H. contortus larvae will overwinter and retain their infectivity if they are on forage species which have heavy dense growth characteristics rather than on forages which have an open, sparse type of growth. Larval behavior on different plant species is discussed.

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Accession: 014639316

Download citation: RISBibTeXText

PMID: 14125157

DOI: 10.2307/3276049

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