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The lice life cycle takes 34 - 36 days from eggs to mature females. Eggs require specific conditions to continue to develop, and hatch after nine to ten days. Nymphs go through three stages as they moult and grow before finally reaching adulthood. Females will mate within hours of the final moulting, but won’t lay eggs for three to four days. Mated and unmated females will lay the same number of eggs, but eggs will not hatch if mating hasn’t occurred.
There are three withholding periods for meat/milk and two for wool/sheep:
It is given at a critical time to sheep that are susceptible to worm infection (e.g. weaners and pre-lambing ewes) and also given at times to reduce worm larval contamination of a pasture grazed by the drenched sheep over the following weeks or months. The sheep themselves may have a low worm egg count at the time of this pre-emptive treatment.
Yes, A goat’s resistance to worms directly affects the number of worms it carries. In more resistant goats (those with lower WEC EBV), the worm egg count will be lower, and fewer eggs will be passed into the dung and onto the pasture.