J. Anim Sci.
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J. Anim Sci. 1968. 27:1682-1689.
© 1968 American Society of Animal Science
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Performance and Carcass-Fat Characteristics of Cattle Fed All-Concentrate Diets Varying in Calcium and Phosphorus Contents1

D. H. Bushman, L. B. Embry, R. M. Luther and R. J. Emerick2

South Dakota Agricultural Experiment Station, Brookings,3

Abstract

Varying calcium levels in the range of 0.15 and 0.60% and phosphorus in the range of 0.37 and 0.79% in an all-concentrate diet for finishing steers had no effect on weight gains, feed consumption, blood calcium and phosphorus or bone ash. A 19% (significant P<.05) thinner fat thickness over the I. dorsi muscle was associated with the feeding of 0.60% calcium when compared with the 0.15% calcium treatments. Two sources of calcium, ground limestone and dicalcium phosphate, were used and no significant difference between sources was observed for any of the criteria. The thinner fat thickness was accompanied by a significant (P<.01) increase in the concentration of the 16:0 fatty acid, but the effect on carcass fat did not appear to be related to variations in proportions of volatile fatty acids produced in the rumen. Dressing percent, grade, area of the I. dorsi muscle and marbling were not affected by treatment.

Footnotes

1 Published with the approval of the Director of the South Dakota Agricultural Experiment Station as Publication No. 802 of the Journal Series and supported in part by Public Health Service research career program award No. K3-AM-28, 621 from the Institute of Arthritis and Metabolic Diseases.

2 The authors gratefully acknowledge the valuable assistance of Dr. Yvonne A. Greichus in performing the gas chromatographic analyses.

3 Departments of Experiment Station Biochemistry and Animal Science.






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Copyright © 1968 by the American Society of Animal Science.