Hooo-Hooo Volume 10, Nr 3 - Page 17

layer, especially on the periphery is usually uneventful (Figure 2 and 6). Damaging the core could lead to cavitation and horn growth abnormalities (Figure 3). Figure 2: A) The initial square cut on this rhino was just to low, thus mildly damaging the central the chainsaw germinal layer. Further trimming with the chainsaw also caused mild damage to the peripheral germinal layer at the skin-horn junction. Mild damage like this is unlikely to cause long term complications, although it is best to avoid this where possible. B) The use of a steel grinding disc helps to cauterize the areas that bleed profusely. Figure 1: White rhino cow several weeks after being dehorned by the conventional square cut method. Normal wear on the horn edges are visible. This method leaves to much horn behind, making it worthwhile for the poachers to kill these rhino. Figure 3: A) White rhino cow with horn fissure resulting from central cavitation. This rhino was dehorned 2 years prior using a reciprocating saw. B) All the excess horn was removed to open up the infected area. Far better to lower the risk of poaching is the Kock and Morkel method.* Short video demonstrating this method: https://www.youtube.com/ watch?v=LLNCrC8Etfk. Not only is direct damage to the germinal layer a risk, but cutting to close to the germinal layer, especially with a blunt (thus over-heated) blade could lead to heat necrosis (Figure 4). Effective dehorning involves removing as much of the horn as possible, only leaving a thin layer of horn to cover the germinal layer. The technique is performed using a chainsaw to make