Current methods of sexing archaeological Cattle bones, in particular the metapodials, are based upon past research into contemporary breeds and this work embraces a limited sample size, spread across a vast geographical area. Although the separation of cows and bulls is not in question, there appears a great deal of subjectivity in the literature concerning the identification of castrated beasts.Living bone is in a dynamic state of equilibrium with the rest of the body and responds to increased loading, that is, an increase in weight of the beast or stresslstrain through strenuous movement, by remodelling. If cows and oxen are performing the same work, as for example in ploughing, then loading on the bones will be similar. These bones will thus respond by remodelling in corresponding fashion, and hence any morphological and metrical distinctions will be clouded. Horn-cores are less subject to these constraints, although in some cultures there may be loading on these bones, for example through attaching the harness to the horns for ploughing.The Chelmsford cattle horncores constitute waste from some industrial activity and it is argued in the text that horn-working is the most likely candidate, together with possibly tanning. Sexing of the bones strongly indicated male animals, with few females being present. A procedure for detecting castrated cattle (oxen) is presented, the results of which suggest an equivalent ratio of oxen to bulls.