"Little Jack Horner sat in his corner
Working his butt off making buttons, combs, book covers, lant horns, tools, spoons, ladles, etc..."
Horners were very busy crafters, they were called upon to make numerous products from combs to "lant horns" (lanterns). Horn was the plastic of the day because it could be heated and molded into various shapes and was quite easy to work. Horn products were very much in demand and it is unlikely that there would be a demand for polled cattle (hornless) since it meant there was less of the cow to be sold. Most polled breeds of cows were established in the mid to late 1800's, long after the market for longbow nocks had faded out.