Hostname: page-component-cd9895bd7-hc48f Total loading time: 0 Render date: 2024-12-25T08:14:02.739Z Has data issue: false hasContentIssue false
  • English
  • Français

The effect of body-weight loss on the composition of Brahman cross and Africander cross steers

1. Empty body weight, dressed carcass weight and offal components

Published online by Cambridge University Press:  27 March 2009

R. M. Seebeck
R. M. Seebeck
Affiliation:
C.S.I.R.O., Division of Animal Genetics, Cattle Research Laboratory, P. O. Box 542, Rockhampton, Queensland, Australia
Get access Rights & Permissions [Opens in a new window]

Summary

Comparative slaughter was used to assess the effects of body-weight loss on Brahman cross (BX) and Africander cross (AX) steers of the F3 generation with respect to the empty body weight, the hot carcass weight and various offal components. Animals were slaughtered at design weights of 325, 341, 358, 374 and 390 kg, some while during positive body-weight growth (Group A) and others during weight loss from 390 kg at a rate of 0·5 kg per day (Group B).

AX animals had less empty body weight (B. B. W.) and dressed carcass weight (H. C. W.) at the same fasted body weight. Weight loss also reduced the amount of E. B. W. at the same fasted body weight but the effect on H. C. E. was not significant.

The breeds were very similar with respect to the various components of the offal, except that the AX had heavier heads. The weight loss treatment increased the proportion of the head, tail and feet, because these comparatively bony structures lost relatively little during the weight loss period. The heart was also relatively increased by the weight loss treatment. The liver, gall bladder, kidneys, total gut tissue, spleen and thymus were reduced relative to E. B. W. in Group B animals. The liver showed its most rapid weight loss in the early period of body-weight loss, being the only organ to show any variation in its rate of change during body-weight loss.

Body-weight loss caused changes in the distribution of the gut tissue, with a relative loss in the rumen-reticulum and a relative gain in the hind gut.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 80 , Issue 2 , April 1973 , pp. 201 - 210
Copyright
Copyright © Cambridge University Press 1973

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Carnegie, A. B., Tulloh, N. M. & Seebeck, R. M. (1969). Developmental growth and body weight loss of cattle. Aust. J. agric. Res. 20, 405–15.CrossRefGoogle Scholar
Efroymson, M. A. (1960). Multiple regression analysis. In Mathematical Methods for Digital Computers, Ralston, A. and Wilf, H. S. (Eds.) New York: Wiley.Google Scholar
Harper, H. A. (1965). Review of Physiological Chemistry. 10th Ed.Los Altos, Calif.: Lange Medical Publications.Google Scholar
Hewetson, R. W. (1962). Dressing percentages of Brahman and Africander cross and of British breed steers. Aust. J. exp. Agric. and Anim. Husb. 2, 82–5.CrossRefGoogle Scholar
Huxley, J. S. (1932). Problems of Relative Growth. London: Methuen.Google Scholar
Kennedy, J. F. & Turner, H. G. (1959). A project on genetics of adaptation in cattle. Aims and methods. C. S. I. R. O. Division of Animal Health and Production. Divisional Report No. 8 (series S. W. 3).Google Scholar
Munro, H. N. (1964). General aspects of the regulation of protein metabolism by diet and by hormones. In Mammalian Protein Metabolism, (ed.Munro, H. N. and Allison, J. B.), vol. I. New York: Academic Press.Google Scholar
Seebeck, R. M. (1967). Developmental growth and body weight loss of cattle. I. Experimental design, body weight growth, and the effects of developmental growth and body weight loss on the dressed carcass and the offal. Aust. J. agric. Res. 18, 1015–31.CrossRefGoogle Scholar
Seebeck, R. M. & Tulloh, N. M. (1968 a). Developmental growth and body weight loss of cattle. II. Dissected components of the commercially dressed and jointed carcass. Aust. J. agric. Res. 19, 477–95.CrossRefGoogle Scholar
Seebeck, R. M. & Tulloh, N. M. (1968 b). Developmental growth and body weight loss of cattle. III. Dissected components of the commercially dressed carcass, following anatomical boundaries. Aust. J. agric. Res. 19, 673–88.CrossRefGoogle Scholar
Seebeck, R. M. & Tulloh, N. M. (1969). Developmental growth and body weight loss of cattle. IV. Chemical components of the commercially dressed and jointed carcass. Aust. J. agric. Res. 20, 199–211.CrossRefGoogle Scholar