J. Anim Sci.
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J. Anim Sci. 1974. 39:865-870.
© 1974 American Society of Animal Science
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Comparison of Tissue Enzyme Levels and Carcass Characteristics in Hereford and Holstein Steers1

R. J. Martin and L. L. Wilson2,3,

The Pennsylvania State University University Park, Pennsylvania 16802

Abstract

Five Hereford and seven Holstein male calves were obtained at an average age of 12 days. The calves were fed milk replacer via a mechanical nursing unit and after weaning, were fed ad libitum a 66% TDN diet. The cattle were slaughtered on an individual unshrunk weight basis. Mean slaughter ages and 16 hour fasted weights for Hereford and Holstein steers were 397 and 357 days and 383 and 394 kg, respectively. Liver and adipose tissue samples were obtained immediately after slaughter for subsequent analysis of several enzymes. Fat thickness for Herefords and Holsteins averaged 1.95 and 0.64 cm, respectively (P < .001). No significant differences were observed for protein content of kidney or subcutaneous adipose tissues. Herefords averaged higher for subcutaneous 6PGD (P < .05) and perirenal adipose 6PGD (P < .01) and ICDH (P < .05). Mean liver tissue levels for FDPase and GOT were greater (P < .05) for Holsteins than for Herefords. Adipose glycerokinase was present in lower levels than previously observed in nonruminants, and therefore, may not be important in enhanced lipid deposition in ruminants. As indicated by total variance correlations, none of the liver enzymes were significantly correlated with live or carcass traits. However, steers with greater adipose G6PD and 6PGD levels gained slower and were fatter (P <.05).

Footnotes

1 Authorized by the Director of the PAES for publication as paper No. 4541 in the journal series; number assigned October 1, 1973.

2 Department of Animal Science.

3 The authors wish to express their gratitude to J. H. Ziegler, J. L. Watkins, C. Rosenberger, R. F. Welton and M. C. Rugh for their assistance in conduct of this study.






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Copyright © 1974 by the American Society of Animal Science.