A description is given of the investigation into two outbreaks of congenital cataract in dairy herds. There is a description of the clinical signs, the incidence, the period of time over which the cases occurred and of the seasonal distribution of the births. The type of herd management is descirbed and a hereditary factor is not considered to occur. The possibility of the involvement of other toxic and environmental agents is discussed. The macroscopic and microscopical findings are described; the relation to the early period of lens development of the bovine fetus suggested.
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