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Table 3 Meta-analysis of 94 trials on the estimated effect of parasitic infection on sheep performance

From: Effect of gastro-intestinal nematode infection on sheep performance: a systematic review and meta-analysis

Production trait Infection type Number of trials Ratio production infected/control 95 % C.I. Number of trials reporting egg excretion Mean number of eggs per gram faeces in infected animals
Weight gain Mixed speciesa 30 0.74 0.71–0.77 22 2336
Weight gain H. contortus 20 0.79 0.71–0.87 20 4019
Weight gain T. colubriformis 12 0.78 0.71–0.87 12 1070
Weight gain T. circumcincta 8 0.81 0.66–0.99 4 296
Wool production Mixed speciesa 14 0.9 0.86–0.93 11 3788
Wool production H. contortus 2 1.04 0.96–1.13 2 7585
Wool production T. colubriformis 2 1.02 0.95–1.1 2 1359
Wool production T. circumcincta 1 0.83 0.81–0.86 1 201
Milk yield Mixed speciesa 5 0.78 0.73–0.84 1 527
  1. aMain species were of the genus Haemonchus, Teladorsagia, Trichostrongylus, Cooperia and Nematodirus