Abstract
Seven fattening Japanese black cattle showed lacrimation, exophthalmos, mydriasis, diarrhea, edema and blindness. They exhibited a decrease in nuclear cells and degeneration of optic nerve cells. They presented a low level of serum retinol (19.7±5.7 IU/dl) and extremely small quantities of vitamin A in the liver of two cases. They were given forage containing vitamin A and a small amount of β-carotene. When 25 healthy cattle 13-30 months old were fed the same forage for a long time serum retinol contents decreased with the lapse of time.
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