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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

The prophylactic effect of ivermectin treatment of calves, three weeks after turnout, on gastro-intestinal helminthiasis.

In two grazing experiments carried out in 1982 and 1983 the prophylactic effect on gastro-intestinal helminthiasis of a single ivermectin treatment of calves 3 weeks after turnout was studied in animals which were turned out early on contaminated pasture and in calves which were turned out late on mown pasture. A single ivermectin treatment 3 weeks after early turnout did not prevent heavy helminth infections. However, such single treatment of calves 3 weeks after a late turnout on mown pasture appears to be a promising way of preventing heavy infections. Late turnout on mown pasture without anthelmintic treatment was not enough to prevent heavy infections. Ivermectin treatment was more effective against Ostertagia spp. than against Cooperia spp. There was no effect on the faecal egg output of Nematodirus helvetianus. Predominantly due to the dry summer, infections were lighter in 1983 than in 1982. These lower infections, and possibly also a delay in the onset of inhibition and differences in helminth strains, may explain the lower proportion of inhibited development in Ostertagia spp. in 1983 than in the comparable groups in 1982.[1]

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