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The Length of Time Required for Depletion of Vitamin A Reserves in Range Cattle1

J. K. Riggs

Texas Agricultural Experiment Station, Spur, and Bureau of Animal Industry, United States Department of Agriculture, Washington, District of Columbia

A table showing the depletion time for 260 range cattle ranging in age from 3 to 16 months is presented. The data bear out the statement of Bessey and Wolbach ('39) that the accumulation of vitamin A in the body tends to increase with age and is dependent on the character of the diet. In dry years when only limited amounts of green vegetation are available on the range the time required for vitamin A deficiency to occur is less than in years of more abundant rainfall. This fact as well as the age of the animals must be taken into consideration when cattle are fed in dry lot for considerable periods of time on rations which do not supply an abundance of carotene or vitamin A.

One thousand micrograms of carotene (fed in dehydrated alfalfa leaf meal) per 100 pounds live weight daily added to the depletion ration for calves lengthened the average time required for the occurrence of night blindness only 15 days.

1 This report is part of an investigation to determine the carotene requirement for fattening beef cattle which became cooperative with the United States Department of Agriculture, Bureau of Animal Industry in 1935. A part of the data in this paper were presented in a paper entitled "Carotene Requirements for Fattening Beef Cattle" by J. H. Jones, J. K. Riggs, G. S. Fraps. J. M. Jones, H. Schmidt, R. E. Dickson, Paul E. Howe and W. H. Black, which was published in the Proceedings of the American Society of Animal Production, 1938, pages 94–102.

Manuscript received 17 July 1940.


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