J. Anim Sci.
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J. Anim Sci. 1968. 27:1663-1668.
© 1968 American Society of Animal Science
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Effects of Sources of Supplemental Nitrogen and Minerals, Level of Chlortetracycline, and Moisture Content of Corn on the Performance of Ruminants Fed All-Concentrate Diets1

K. K. Bolsen2, E. E. Hatfield, U. S. Garrisus, P. E. Lamb and B. B. Doane

University of Illinois, Urbana3

Abstract

The effects of sources of supplemental protein and minerals, level of chlortetracycline and moisture content of corn was studied with 110 steers, 40 heifers and 60 lambs fed all-concentrate diets. Rate and feed efficiency of gain were satisfactory on all diets. Soybean meal, urea and urea-alfalfa meal-molasses mixture at isonitrogenous levels produced similar results as sources of supplemental nitrogen in cattle diets; and soybean meal, urea and biuret produced similar performances in lamb diets. A special mineral mixture containing various kinds and levels of minerals did not improve feedlot performance of finishing heifers over a 2:2:1 mixture of limestone: dicalcium phosphate: trace-mineralized salt for supplementing all-concentrate diets. Chlortetracycline was effective in reducing the incidence of abscessed livers at time of slaughter. Heifers with abscessed livers gained significantly (P<.01) less than heifers with clinically normal livers. Steers offered a diet composed of 15 % moisture corn supplemented with urea and minerals consumed more dry matter and gained faster than steers offered a diet made of 30% moisture corn supplemented with urea and minerals.

Footnotes

1 Supported in part by federal funds, Hatch 20–336, and by grants-in-aid from Dow Chemical Company, Midland, Michigan and by Moorman Manufacturing Company, Quincy, Illinois.

2 Present address: Animal Science Department, University of Nebraska, Lincoln.

3 Animal Science Department.






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Copyright © 1968 by the American Society of Animal Science.