Abstract
On California ranges during the dry feed season, conditions are favorable for the development of vitamin A deficiency in livestock. Under average conditions, however, the length of the dry season coupled with the varied sources of feed containing some vitamin A is such that the reserves accumulated in the bodies of the animals from the green feed season are sufficient to carry them through the drought period. While its existence has been suspected during recent years, the past winter has been the first time the diagnosis has been definitely established. This was possible because weather conditions and management of one ranch in southern Tulare County caused its development in such a severe form that 100 animals died with many more showing symptoms in a herd of about 250 head.The ranch comprises 3000 acres of land practically all of which is farmed to wheat and barley. The owner maintains 75 dairy cows. Calves from these cows, together with others purchased when a few days old from dairy farmers, nurse the...
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