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Table 2 A description of the phenotype measurements used in the linkage analysis and their associated abbreviation

From: Discovery of quantitative trait loci for resistance to parasitic nematode infection in sheep: I. Analysis of outcross pedigrees

Abbreviation

Description of phenotype measurement

Units of measurement

σp*

DAG0

Dag score at weaning

0–5 scale

0.56

DAG1

Dag score at the end of the first parasite challenge

0–5 scale

0.89

DAG2

Dag score at the end of the second parasite challenge

0–5 scale

0.82

ELISA1

IgG specific to T.colubriformis in serum collected at weaning

OD490 using reference sera as standards

0.079

ELISA2

IgG specific to T.colubriformis in serum collected 4 weeks after weaning

OD490 using reference sera as standards

0.095

ELISA3

IgG specific to T.colubriformis in serum collected at the end of the first parasite challenge

OD490 using reference sera as standards

0.157

ELISA4

IgG specific to T.colubriformis in serum collected 4 weeks after the start of the second field challenge

OD490 using reference sera as standards

0.158

ELISA5

IgG specific to T.colubriformis in serum collected at the end of the second field challenge

OD490 using reference sera as standards

0.171

LAOST

Log transformed estimates of T. circumcincta adults and late stage larvae found in the abomasum collected at slaughter at the end of the second parasite challenge

Number of individuals

0.92

LATRICH

Log transformed estimates of Trichostrongylus spp. adults and late stage larvae found in the abomasum collected at slaughter at the end of the second parasite challenge

Number of individuals

0.69

LFEC1

Log transformed mean estimate of Strongyle eggs per gram of faecal material collected and measured 3 times over five days at the end of the first parasite challenge

Number of eggs per gram of faeces

0.51

LFEC2

Log transformed mean estimate of Strongyle eggs per gram of faecal material collected and measured 3 times over five days at the end of the second parasite challenge

Number of eggs per gram of faeces

0.68

LIGE

Log transformed estimates of total IgE in serum collected at the end of the second parasite challenge

OD450 using reference sera as standards

0.70

LSINEM

Log transformed estimates of Nematadirus sp. adults and late stage larvae found in the small intestine collected at slaughter at the end of the second parasite challenge

Number of individuals

1.22

LSITRI

Log transformed estimates of Trichostrongylus spp. adults and late stage larvae found in the small intestine collected at slaughter at the end of the second parasite challenge

Number of individuals

0.82

SNEM1

Scaled mean estimate of Nematodirus spp. eggs per gram of faecal material collected and measured 3 times over five days at the end of the first parasite challenge

Number of eggs per gram of faeces

0.76

SNEM2

Scaled mean estimate of Nematodirus spp. eggs per gram of faecal material collected and measured 3 times over five days at the end of the second parasite challenge

Number of eggs per gram of faeces

0.82

WTFEC2

Liveweight of lambs at the end of the second parasite challenge

kilograms

3.63

  1. * σp = residual SD from a model containing all fixed effects including sire (but no marker effects).