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Answers and links to further information are provided below the image.
1. In the winter rainfall and Mediterranean-climate regions, should young sheep routinely be given a first summer drench?
2. How long does the flystrike protection from Spinosad flystrike treatment and protection products last?
3. Are “hair breeds” of sheep and their crosses able to be infected by and spread lice?
4. Can goats be infected by sheep measles?
Yes. Young sheep are most susceptible to worms and giving them a summer drench relieves their worm burden and assists in preparing lower-worm pastures for the coming winter.
Adults may or may not need a first summer drench, see details in the link.
Only one product (Extinosad Lice, Fly and Maggot Eliminator) containing spinosad is registered for protection against flystrike and will provide at least 8 days protection on mulesing and other wounds and up to 4–6 weeks protection when jetted onto adult sheep. This product is also considered an allowable input on organic properties accredited under the Australian Certified Organic standard, but this certification does not extend to other programs. Other spinosad products are for treatment of flystrike (rather than prevention) and treatment of lice, and are not recognised by organic programs. Always read the label to ensure you are using the correct formulation for the job at hand.
Anecdotal evidence does suggest that lice are rarely detected on these breeds. However, external parasites will survive on some individuals. But Merino/hair breed crosses are more susceptible to lice.
Goats can be infected, but they rarely cause ill-effects. However, infection can result in carcases being condemned.