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The eosinophil leucocyte, a phenotypic marker of resistance to nematode parasites, is associated with calm behaviour in sheep

The hypothesis that behaviour in sheep is influenced by resistance to infections with Trichostrongylus colubriformis and Haemonchus contortus was explored. Sheep were assessed phenotypically as resistant and susceptible in four ways and thereafter, the effect of resistance on several behavioural traits was measured in an arena test. The behavioural parameters recorded for each sheep were: approach/avoidance distance; travel; number of moves; and spread. Four phenotypic groups of sheep were set up each with two subgroups: ovine lymphocyte antigen (OLA) type (subgroups SY1a type vs other types); blood eosinophil leucocyte counts (high vs low); T. colubriformis and H. contortus serum antibodies (high vs low titres) and faecal egg count (FEC) (high vs low).