Cattle grubs damage the animal ' s tissues, further reducing the carcass's value . They affect the animal ' s ability to graze efficiently, reduce weight gain, and delay first lactation. Larvae emerge after 4-7 days and burrow into the skin, cause considerable irritation, and then migrate through the animal ' s connective tissues. After two months, the grubs emerge, drop to the ground, and pupate in pasture litter and soil for 2-8 weeks before adult flies emerge. No pesticides are currently registered for control of cattle grubs on lactating dairy cattle.
Mange mites cause dermatitis, hair loss, scabbiness, and milk production decline.
Be cautious when buying or introducing new animals. Inspect for visible skin that appear to be abnormally itchy or agitated. For insect treatment on barn animals. Abbe, D. and S.R. Edwards. National Agricultural Statistics Service.