Fourie, P.J.J.; Alexander, R.A.; Clark, R.; Louw, J.G.; De Kock, V.E.
(Published by The Government Printer, Pretoria, 1953)
An ox, No. 7017, suffering from bovine congenital porphyrinuria (pink tooth)
and excreting as much as 1•6 gm. of total pophyrins in faeces and urine per day,
was still in reasonably good health at the age of 18 years. ...