WARBLES OR GRUBS.
Cause.—By the heel-fly or warble-fly. They deposit their eggs on the legs of cattle during the fall. The animal, licking the parts, takes the eggs into its mouth. These eggs gradually migrate into the gullet, where they hatch and burrow through the tissues, and in the early spring will be found in the region of the back in the form of small lumps under the skin.
Symptoms.—Warbles are frequently seen under the skin in the region of the back and over the loins, and are very tender to the touch. When they are fully developed they work their way through the skin, which usually occurs in the early part of the summer. Examine your cattle in the winter and spring for the presence of grubs. They can be easily found by running the hand over the loins, by abrupt swellings or bunches on the skin. Pressure on the swelling will perhaps cause the grubs to pop out.
Treatment.—Remove the grubs by making a small incision with a clean, sharp knife in the center of the swelling. Then press them out and into each cavity from which the grub has been extracted, or squeezed out, should be injected a five per cent solution of Carbolized Sweet Oil to prevent any further development of flies or grubs. Cattle sprayed with fly repellants during the spring and summer are very seldom bothered with warbles or grubs. However, this is not practical in range cattle; dipping instead should be resorted to, and it is surprising what results will be derived from fly repellants in a year or two. They will practically exterminate the pest, and consequently the cattle are thrifty and look much better.