Withholding periods are mandatory with all registered veterinary products used to treat sheep for worms, flies or lice. These periods have been developed to indicate when the chemical residue that remains in or on meat and wool products will not exceed the maximum residue limit.
These limits are set in Australia to ensure that:
There are three withholding periods:
Other important intervals that need to be observed:
The meat WHP appears on the labels of all registered veterinary products.
A Trade Advice statement (such as an ESI) may not appear on labels of older registered veterinary products, however, all new products will now include a Trade Advice statement.
All current ESIs can be found on the APVMA website: http://apvma.gov.au/node/10806, see ‘Export Slaughter Intervals and Chemical Withholding Periods’.
The WHP information for all registered veterinary products can be found at https://portal.apvma.gov.au/pubcris.
If a lice or fly treatment does not state a Wool Harvest Interval (WHI) or a Sheep Rehandling Interval (SRI), then a default one-month period applies for mob treatments or for wound dressings. Flystrike treatments for individual sheep have a default withholding period of at least one month for wool.
Always consult the product label and follow the directions for use.