30006 ABSENT PINNAE [NK]

Black rhinoceros

Absence of pinnae in the black rhinoceros has been recorded in at least 7 discrete populations in eastern and southern Africa (Goddard 1969). Of the 15 affected animals whose sex was known, 13 were males; 1 of the females may have been sired by an affected male, and the other was affected only unilaterally. Although relevant breeding data are virtually nonexistent, Goddard (1969) suggests that the trait may be X-linked de Vos (1978) reported a unilaterally affected bull.

de Vos V: 1978. Congenital unilateral aotus in a black rhinoceros Diceros bicornis bicornis (Linn. 1758). J S Afr Vet Assoc 47: 71 only.

Goddard J: 1969. A note on the absence of pinnae in the black rhinoceros. E Afr Wildl 7: 178–181.

*30030 AGAMMAGLOBULINEMIA (BRUTON-TYPE AGAMMAGLOBULINEMIA; IMDI)

Cattle

Perk and Lobl (1962) studied a 3-month-old bull calf with agammaglobulinemia; the animal had repeated respiratory tract infections and several attacks of severe diarrhea, and died before additional immunologic studies could be carried out.

Horse

This disorder has been observed in Thoroughbred, Standardbred, and quarter horses. Four cases (all colts) were diagnosed among 2,516 horses evaluated for immunologic disorders (Perryman et al. 1983). Two of these have been described in detail (Banks et al. 1976; McGuire et al. 1976; Deem et al. 1979); both died at approximately 11/2 years. Pneumonia, enteritis, dermatitis, arthritis, and laminitis were noted at 2–6 months of age after the maternally derived immunoglobulins disappeared. B lymphocytes were absent, IgM and IgA could not be detected, and IgG and IgG(T) occurred in very low concentrations.