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The Growth of Skin Area in Sheep

Wyoming Experiment Station

Abstract

In the dimensional studies of wool fibers undertaken at this Station, the variation occurring in samples taken from relatively small neighboring areas of skin made it necessary to obtain wool samples taken from identical areas of skin at various intervals of time. It was necessary to devise a method of marking such areas of skin in order to obtain wool samples from identical skin areas. While the writer was at Edinburgh University, the sheep division of the Institute of Animal Genetics had marked skin areas on sheep by surgical means, cutting through the epidermis with a specially designed scalpel and rubbing India ink into the cut. This gave a very satisfactory mark, but the operator must be highly skilled in surgical technique, and often the marks were not uniform due to gaping of the skin when cut too deep.

In the fall of 1931 the writer began to experiment with electric tattooing as a means of marking small areas of skin, and after some difficulties were overcome, was able to work out a satisfactorp technique. A popular article on tattooing sheep was prepared and published in The Sheepman (June, 1933, page 10).