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Từ điển thú y vần N | N Nagana Nagana is an unscientific but convenient name for trypanosomiasis transmitted by tsetse flies Glossma spp. in Africa. The trypanosomes involved are Trypanosoma vivax T. uniforme T. congolense T. brucei T. simiae and T. suis. See TRYPANOSOMES. The symptoms of nagana include anaemia intermittent fever and except in pigs in which the disease may be very acute a slow progressive emaciation. In both horses and dogs the eyes may be affected as shown by corneal opacity. Horses often have oedema affecting the limbs and abdomen. Cattle may abort. The drug quinapyramine is used among others in treatment. The kudu hyena and bush-buck as well as other wild animals act as reservoirs of the infection. Nail Binding see INJURIES FROM SHOEING Nails Claws A claw contains a matrix with blood vessels nerves etc. from which it grows and is nourished. Lying within the matrix is the bone of the terminal phalanx of the digit which gives the nail its characteristic form in the different animals. When not in use in the carnivora nails are retracted by ligaments in an upwards direction this is more marked in cats where the nail may almost disappear than in dogs. Nails Diseases of The nails of cats and dogs sometimes become torn or broken through fighting or accidents. Sometimes only the tip is injured and the matrix higher up is undamaged in such cases a fine pellicle of horn covers the tip until such time as the horn has grown down from above and the whole nail is not shed. In other cases infection occurs causing great tenderness of the part. Ingrowing nails occur upon the dew claws on the insides of the paws of dogs. These more or less rudimentary digits do not touch the ground and are consequently not subjected to wear from friction. The nails grow and owing to their curve eventually penetrate the soft pad behind them. Where actual penetration has occurred the nail should be cut short and an antiseptic dressing applied. It is customary for owners of sporting and other dogs to .
