Approved parasitical also can be used when preventive practices have proven ineffective. Use of parasitic ides is restricted to breeding stock, and they must be administered prior to the last third of gestation.
Treating lactating sows or market animals with parasiticide is required if medically necessary, but the sow,
her nursing piglets, and the market animals would then lose their organic status.
Physical alteration of organic livestock to promote their welfare is allowed but should be performed in a
manner that minimizes pain and stress.
Organic livestock must be identified, and the use of ear notches, ear tags, and tattoos are all currently
approved methods for individually marking breeding stock and potential replacements.