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I noticed Kudu bulls doing the same thing with there horns and was told that they put mud on their horns to remove the shine. Their horns tend to shimmer in sun light, lions and other predators could see it and that is why Kudu's do that. I thought it could be the same reason for Nyala.

The klipspringer will horn bushes to mark territory, the kudu does so as a mild form of aggression display. Kudu also dig up mud with their horns as aggression display. Such display is always in the presence of other kudu.
But why would this kudu horn mud? Sue Visser of Lynnwood Ridge watched the kudu bull as it repeatedly pushed and rolled its horns into the mud. She says that she has heard stories of kudus doing so to take the shine off their horns to make them less conspicuous. The bull did not bother to drink at the water hole but only busied itself with the mud. There were no other kudu in the vicinity.

This is not a case of wallowing in the mud. Mud wallowing is not typical of Tragelaphines such as kudu, nyala and sitatunga. Bovines like buffalo, elephants, rhino and warthogs relish a wallow either to cool down or give their hides a protective mud coating against parasites such as ticks and biting flies. The only member of the Tragelaphine tribe known to dig and toss wet soil with their horns, is the nyala and specifically aggressive bulls.

I have no knowledge of kudu smearing mud on their horns for camouflage. I do know, however, that the skin of the kudu’s cheek and ear is oily and that attracts flies. So, perhaps this is a case of trying to get mud on those head parts to control parasites. Or it is a misplaced show of mild aggression.

Horning: kudu bulls use their horns to break off branches to gain access to leaves normally out of reach. Ground horning, when the horns and face are rubbed in mud or dry ground is form of territorial behaviour found in kudu as well as in nyala, bushbuck and wildebeest.

Kudu also dig up mud with their horns as aggression display. Such display is always in the presence of other kudu.
But why would this kudu horn mud? Sue Visser of Lynnwood Ridge watched the kudu bull as it repeatedly pushed and rolled its horns into the mud. She says that she has heard stories of kudus doing so to take the shine off their horns to make them less conspicuous. The bull did not bother to drink at the water hole but only busied itself with the mud. There were no other kudu in the vicinity.

Can anyone truly believe that a Kudu 'knows' that his horns are shiny enough to attract predators? Any Field Guide (Game Ranger) who suggest this is the case should be demoted to Pen-pusher with immediate effect!

The horning of mud is done as territorial behaviour

The dominance/territorial display occurs when a potential threatening male enters the personal space/territorium of a male when courtship is likely to take place.

This should not be seen as the normal defending a territory.

Maybe dominace display/aggressive display is better wording.

dominance hierarchies.