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The value of circulating eosinophil count as a selection criteria for resistance of sheep to trichostrongyle parasites.
The value of circulating eosinophil count as a selection criteria for resistance of sheep to trichostrongyle parasites.
- Source :
-
International journal for parasitology [Int J Parasitol] 1996 Jan; Vol. 26 (1), pp. 123-6. - Publication Year :
- 1996
-
Abstract
- In merino sheep bred for either increased or decreased resistance to Haemonchus contortus, faecal worm egg counts (FEC) were lower in the resistant line (6,831 vs 17,645 epg, P < 0.01), and circulating eosinophils (EOS) were higher, but not significantly so (3.40 x 10(4) ml(-1) vs 1.40 x 10(4) ml(-1), P = 0.1 1). Another flock was artificially infected with Trichostrongylus colubriformis and significant genetic variation was found in both FEC (heritability 0.40 +/- 0.11) and EOS (0.19 +/- 0.08). In a third flock comprising tropical sheep breeds, a natural challenge with T. colubriformis resulted in significant sire effects on FEC (heritability 0.20 +/- 0.10) but not EOS (heritability inestimable). We conclude that EOS offers no advantage over FEC as it selection criterion for resistance.
- Subjects :
- Analysis of Variance
Animals
Female
Haemonchiasis genetics
Haemonchiasis immunology
Haemonchiasis veterinary
Immunity, Innate genetics
Leukocyte Count
Male
Parasite Egg Count
Predictive Value of Tests
Sheep
Sheep Diseases genetics
Trichostrongyloidiasis genetics
Trichostrongyloidiasis immunology
Trichostrongylosis genetics
Trichostrongylosis immunology
Trichostrongylosis veterinary
Eosinophils
Selection, Genetic
Sheep Diseases immunology
Trichostrongyloidiasis veterinary
Subjects
Details
- Language :
- English
- ISSN :
- 0020-7519
- Volume :
- 26
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- International journal for parasitology
- Publication Type :
- Academic Journal
- Accession number :
- 9198588
- Full Text :
- https://doi.org/10.1016/0020-7519(95)00105-0