Hostname: page-component-78c5997874-j824f Total loading time: 0 Render date: 2024-11-02T22:53:43.275Z Has data issue: false hasContentIssue false
  • English
  • Français

A note on the response of British Friesian steers to trenbolone acetate and hexoestrol, and to alternation in dietary energy intake

Published online by Cambridge University Press:  02 September 2010

H. Galbraith  and
K. J. Geraghty
H. Galbraith
Affiliation:
Division of Agricultural Chemistry and Biochemistry, School of Agriculture, 581 King Street, Aberdeen
K. J. Geraghty
Affiliation:
Division of Agricultural Chemistry and Biochemistry, School of Agriculture, 581 King Street, Aberdeen
Get access

Abstract

Four steers from a group of eight British Friesian steers were implanted with 300 mg trenbolone acetate and 30 mg hexoestrol at the beginning of a 90-day trial period. The remainder were untreated. They were offered diets that varied in estimated content of metabolizable energy as follows (MJ/day): day 0 to 34 (period A), 100; day 35 to 60 (period B), 50; and day 61 to 90 (period C), 75 increasing to 110. Implanted steers gained significantly more live weight in periods A and C, and lost less in period B, than controls. Implanted steers had significantly elevated concentrations of plasma glucose in period A, and lower values for plasma urea and serum albumin throughout. Differences between control and implanted steers for the other blood constituents studied, including growth hormone, insulin and prolactin, were small and not significant. The main effects of changes in dietary energy intake on blood composition included significant increases in both groups of animals in the concentration of free fatty acids and growth hormone during underfeeding (period B). These concentrations decreased in period C, concomitant with significant increases in the concentrations of insulin and prolactin.

Type
Research Article
Information
Animal Production , Volume 35 , Issue 2 , October 1982 , pp. 277 - 280
Copyright
Copyright © British Society of Animal Science 1982

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

REFERENCES

Agricultural Research Council. 1980. Requirements for energy. In The Nutrient Requirements of Ruminant Livestock, pp. 73–119. Commonwealth Agricultural Bureaux, Slough.Google Scholar
Donaldson, I. A., Hart, I. C. and Hertzman, R. J. 1981. Growth hormone, insulin, prolactin and total thyroxine in the plasma of sheep implanted with the anabolic steroid trenbolone acetate alone or with oestradiol. Res. vet. Sci. 30: 7–13.CrossRefGoogle ScholarPubMed
Galbraith, H. 1982. Growth, hormonal and metabolic response of post-pubertal entire male cattle to trenbolone acetate and hexoestrol. Anim. Prod. 35: 269–276.Google Scholar
Galbraith, H. and Geraghty, K. J. 1978. Effect of dietary energy intake and implantation with trienbolone acetate and hexoestrol on the growth performance and blood metabolites and hormones of British Friesian steers. Anim. Prod. 26: 361 (Abstr.).Google Scholar
Galbraith, H. and Topps, J. H. 1981. Effect of hormones on the growth and body composition of animals. Nutr. Abstr. Rev. Ser. B 51: 521–540.Google Scholar
Galbraith, H. and Watson, Helen. B. 1978. Performance, blood and carcase characteristics of finishing steers treated with trenbolone acetate and hexoestrol. Vet. Rec. 103: 28–31.CrossRefGoogle ScholarPubMed
Heitzman, R. J. 1981. Mode of action of anabolic agents. In Hormones and Metabolism in Ruminants (ed. Forbes, J. M. and Lomax, M. A.), pp. 129–139. Agricultural Research Council, London.Google Scholar
Miller, T. B., Chigaru, P., Downie, J. G., Galbraith, H., MacDonald, D. C. and Topps, J. H. 1978. Observation s under field conditions—the suckler cow. In The Use of Blood Metabolites in Animal Production, Occ. Publ. Br. Soc. Anim. Prod., No. 1, pp. 71–86.Google Scholar
Scottish Agricultural Colleges. 1978. Nutrient allowances for cattle and sheep. Publ. Scott. Agric. Coll., No. 29.Google Scholar
Stafford, S. J., Galbraith, H. and Topps, J. H. 1981. The effect of intake of metabolizable energy on the response of steers to implantation with Revalor. Anim. Prod. 32: 378–379 (Abstr.).Google Scholar
Swan, H. 1976. The physiological interrelationship of reproduction, lactation and nutrition in the cow. In Principles of Cattle Production (ed. Swan, H. and Broster, W. H.), pp. 85–102. Butterworth, London.Google Scholar
Weekes, T. E. C. and Godden, P. M. M. 1981. Nutritio n and metabolic hormones. In Hormones and Metabolism in Ruminants (ed. Forbes, J. M. and Lomax, M. A.), pp. 99–111. Agricultural Research Council, London.Google Scholar