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Table 5 Mean worm burdens of Haemonchus contortus, Telodorsagia circumcincta and Nematodirus spp. in tracer lambs used in the field trial conducted in southern Sweden, for the grazing season 2003.

From: Evaluation of Copper Supplementation to Control Haemonchus contortusInfections of Sheep in Sweden

Tracer Test Control Group COWP Treatment
  H. cont. T. circ. Nem. spp H. cont. T. circ. Nem. spp
Turnout Test       
(12/5 – 3/6)# 0 0 0 0 0 0
Autumn Tests       
1(19/8 – 1/9) 0 100 (0%)* 50 (0%) 0 450 (0%) 50
2(1/9 – 15/9) 50 (100%) 650 (0%) 50 (0%) 100 (100%) 400 (0%) 0
3(15/9 – 6/10) 75 (100%) 900 (8%) 50 (0%) 50 (100%) 700 (5%) 0
4(6/10 – 27/10) 0 675 (100%) 50 (0%) 0 475 (100%) 0
  1. # Tracer test interval
  2. *Percentage arrested development