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1. What is the difference between a drench combination and a drench mixture?
2. In winter rainfall areas, when is the best time to select for dag and how is it done?
3. Which sheep in the mob are the best candidates to check for lice?
A combination contains two or more active ingredients that each target the same worms. The chance of a worm being resistant to all active ingredients in the combination is much lower than for each individual active on its own.
A mixture contains two or more active ingredients, but the actives target different worms. These give the convenience of a single drench when quite different worms are targeted; however, they should be considered 'single-active' against each worm.
The best time to assess dag score in a winter rainfall region is in the spring time prior to hogget shearing when at least 20% of the flock have an average score of 2 to 3 (see picture). Consider culling all score 5 sheep prior to mating. Mark score 4 and score 3 ewes and note the number in the flock so that an assessment of how many of these could be culled from the breeding flock can be made.
Look for sheep showing signs of rubbing or biting at their fleece.
Rubbing is a very powerful indicator of infestation and sheep will begin to rub with quite low lice numbers. If sheep are not rubbing, even if lice are present, they will be in such low numbers that it will be almost impossible to find them by random inspections. Therefore, time is most efficiently used by carefully going through the mob trying to identify any sheep with rubbed or pulled wool.