Abstract:
:Accurately identifying resistance to gastrointestinal nematode infections requires the ability to identify animals with low and high intensities of infection. The pathogenic effects of nematodes depend upon both the length and number of worms, neither of which can be measured in live animals. Indices that predict these quantities are urgently needed. Monthly fecal egg counts, bodyweights, IgA concentrations and pepsinogen concentrations were measured on Scottish Blackface sheep naturally infected with a mixture of nematodes, predominantly Teladorsagia circumcincta. Worm number and average worm length were available on over 500 necropsied lambs. We derived predictive indices for worm length and number using linear combinations of traits measured in live animals. The correlations between the prediction values and the observed values were 0.55 for worm length and 0.51 for worm number. These indices can be used to identify the most resistance and susceptible lambs.
journal_name
Parasitologyjournal_title
Parasitologyauthors
Mair C,Matthews L,De Cisneros JP,Stefan T,Stear MJdoi
10.1017/S0031182014001905subject
Has Abstractpub_date
2015-05-01 00:00:00pages
773-82issue
6eissn
0031-1820issn
1469-8161pii
S0031182014001905journal_volume
142pub_type
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