Prozesky, Leon; Van der Lugt, Jaco J.; Verwoerd, Daniel Wynand
(Published by the Government Printer, Pretoria., 1989)
Blindness attributed to vitamin A deficiency afflicted 47 out of 197, and 15 out of 29 new-born dairy calves on 2 farms. Other clinical signs included doming of the forehead, thickening of the carpal joints, incoordination ...