J. Anim Sci.
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J. Anim Sci. 1975. 40:567-572.
© 1975 American Society of Animal Science
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Abomasal Amino Acids and Plasma Nitrogen Constituents in the Bovine Fed Normal or Opaque-2 Corn1

T. L. Redd, J. A. Boling, N. W. Bradley and D. G. Ely

University of Kentucky2, Lexington 40506

Abstract

Ten Hereford steers equipped with permanent abomasal cannulae were used in a study designed to determine the effects of feeding normal vs opaque-2 corn on abomasal amino acids and plasma nitrogen constituents. Trichloroacetic acid precipitable nitrogen reaching the abomasum was 125.3 g/day for steers fed the normal corn diet as compared with 126.3/g day for those fed the opaque-2 diet. Abomasal NPN tended to be higher in the steers fed the opaque-2 diet (39.8 vs 27.2 g/day), but the difference was not statistically significant (P> .10). The quantity of individual amino acids reaching the abomasum was not significantly (P >.10) different between the two groups of steers, although the quantities of all amino acids except lysine, aspartic and cystine tended to be higher in steers fed the normal corn diet. Lysine reaching the abomasum was 48.5 g/day for steers fed the normal corn diet and 51.8 g/day for those fed the opaque-2 corn diet. Plasma urea-nitrogen was significantly (P < .10) higher at 0, 2, 4 and 6 hr post-feeding in steers fed the opaque-2 diet (9.31% C.P.) than in those fed the normal corn diet (7.18% CP.). Plasma amino acid concentrations (um/100 ml) were not different between treatments, with the exception that methionine was higher (P < .10) in steers fed the normal corn diet. These data suggest that the higher lysine level of cracked opaque-2 corn does not result in significantly greater quantities reaching the abomasum.

Footnotes

1 This paper (No. 74-5-5) is published with the approval of the Director of the Kentucky Agricultural Experiment Station.

2 Department of Animal Sciences.






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Copyright © 1975 by the American Society of Animal Science.