These tags are only effective for one summer. This may delay the development of resistance and provided effective control when resistance is present. They can be applied to cattle on an as need basis as set minimum intervals. The residual control of these products is short and they must be applied daily to provide adequate protection. These sprays are very effective if applied every two or three weeks, however more cattle herding and handling is required than may be feasible or practical.
Dusts provide slightly longer residual control than aerosols.
Do not use crank-case oil or used motor oil. Free-choice application involves backrubbers located in pastures where animals are free to use them as they require. To familiarize cattle with a backrubber, place the device with the cattle during the previous winter. Backrubbers located on pasture must be placed near a salt or mineral lick, or where cattle water or rest for part of the day. This makes it as convenient as possible for the cattle to use the device.