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The Effect of Low Manganese Rations upon Dairy Cattle^1,2

From the Department of Biochemistry, College of Agriculture, University of Wisconsin, Madison

ABSTRACT

Experiments have been made with young Holstein heifers from calfhood (200 lb. live weight) through one, two or three lactations on rations composed of good legume hay low in manganese, corn silage and a grain mixture of corn and corn by-products.

(a) Rations with less than 10 ppm. manganese were adequate for growth in young Holstein heifers, (b) Addition of added manganese as a mineral supplement to provide 30, 40 or 60 ppm. did not favorably stimulate growth above that of the control or low manganese lot. (c) Heifers raised on the low manganese or control rations were slower to exhibit oestrus and were slightly and consistently slower to conceive upon breeding, (d) Manganese has no appreciable effect on either the vitamin A, C or carotene content of the blood, hence the synthesis of vitamin C is not contingent upon the manganese content of the ration provided 7 to 10 ppm. of manganese are present in the ration, (e) It was extremely difficult to affect the manganese concentrations of the organs and tissues of dairy cattle with the one exception of the ovary, which exhibited low manganese concentrations when the diet of the cattle contained only 7 to 10 ppm. of manganese in the ration, (f) That low dietary manganese caused abnormal structural changes found in the livers of cattle subsisting thereon.

Cattle readily tolerate 60 to 70 ppm. of manganese in the diet. Twenty ppm. would seem to be a satisfactory level of manganese which provides a margin of safety to meet the requirements of cattle and 10 ppm. or less is distinctly in the marginal or deficient zone. Under practical conditions it would seem that the addition of supplemental manganese to cattle rations would be indicated where the manganese is below 20 ppm. in the ration.

¹ Published with the approval of the Director of the Wisconsin Agricultural Experiment Station.

² These studies were supported in part by a grant from the Tennessee Eastman Corporation, Kingsport, Tennessee.

This article has been cited by other articles:

				L. R. Legleiter, J. W. Spears, and K. E. Lloyd Influence of dietary manganese on performance, lipid metabolism, and carcass composition of growing and finishing steers J Anim Sci, October 1, 2005; 83(10): 2434 - 2439. [Abstract] [Full Text] [PDF]