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The effect of a combination of trenbolone acetate and oestradiol-17β on growth performance and blood, carcass and body characteristics of wether lambs

Published online by Cambridge University Press:  02 September 2010

J. F. S. Coelho ,
H. Galbraith  and
J. H. Topps
J. F. S. Coelho
Affiliation:
School of Agriculture, 581 King Street, Aberdeen AB9 1UD
H. Galbraith
Affiliation:
School of Agriculture, 581 King Street, Aberdeen AB9 1UD
J. H. Topps
Affiliation:
School of Agriculture, 581 King Street, Aberdeen AB9 1UD
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Abstract

Nine Cheviot × Shetland castrated male lambs from a group of 24 of 28 kg initial live weight, were subcutaneously implanted with a combination of 60 mg trenbolone acetate and 12 mg oestradiol-17β at 105 days and again at 45 days before slaughter. Of the remaining lambs, nine were untreated and six were slaughtered at the start of the experiment as part of a comparative slaughter procedure. The lambs treated with the anabolic preparation grew significantly faster (P < 0·05), converted food to live weight and estimated carcass gain more efficiently, had heavier carcasses which were larger, and had greater estimated gains for protein, moisture and ash. Implanted animals also tended to have a smaller deposition of carcass and kidney fat, but significantly heavier kidneys and less wool when the latter three weights were related to empty body weight. The mean values for plasma urea and serum total protein as indicators of protein metabolism were significantly decreased and increased respectively in treated lambs, but no other significant differences in blood metabolites and hormones were recorded. A significant increase in teat length of implanted lambs indicated the oestrogenic nature of the anabolic preparation.

Type
Research Article
Information
Animal Production , Volume 32 , Issue 3 , June 1981 , pp. 261 - 266
Copyright
Copyright © British Society of Animal Science 1981

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References

REFERENCES

Abou Akkada, A. R. and El-Shazly, K. 1976. Application of synthetic estrogens in sheep. In Anabolic Agents in Animal Production. EQS. Suppl., Vol. V. (ed. Coulston, F. and Korte, F.), pp. 99–108. George Thieme, Stuttgart.Google Scholar
Atkinson, T., Fowler, V. R., Garton, G. A., and Lough, A. K. 1972. A rapid method for the accurate determination of lipid in animal tissues. Analyst 97: 562–568.CrossRefGoogle ScholarPubMed
Braithwaite, G. D., Glascock, R. F. and Riazuddin, S. 1972. The effect of hexoestrol on calcium metabolism in the sheep. Br. J. Nutr. 28: 269–273.CrossRefGoogle ScholarPubMed
Coelho, J. F. S., Galbraith, H. and Topps, J. H. 1978. The effect of a combination of trienbolone acetate and 17β- oestradiol on the performance, carcass composition and blood characteristics of castrated male lambs. Anim. Prod. 26: 360 (Abstr.).Google Scholar
Galbraith, H. 1980. The effect of trenbolone acetate on growth, blood hormones and metabolites, and nitrogen balance of beef heifers. Anim. Prod. 30: 389–394.Google Scholar
Galbraith, H., Dempster, D. G. and Miller, T. B. 1978. A note on the effect of castration on the growth performance and concentrations of some blood metabolites and hormones in British Friesian male cattle. Anim. Prod. 26: 339–342.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. In press.Google Scholar
Galbraith, H. and Watson, Helen B. 1978. Performance, blood and carcase characteristics of finishing steeers treated with trenbolone acetate and hexoestrol. Vet. Rec. 103: 28–31.CrossRefGoogle ScholarPubMed
Heitzman, R. J., Chan, K. H. and Hart, I. C. 1977. Liveweight gains, blood levels of metabolites, protein and hormones following implantation of anabolic agents in steers. Br. vet. J. 133: 62–70.CrossRefGoogle ScholarPubMed
Pálsson, H. 1939. Meat qualities in the sheep with special reference to Scottish breeds and crosses. I. J. agric. Sci., Camb. 29: 544–626 (references 30: 63-64).CrossRefGoogle Scholar
Preston, R. L. and Burroughs, W. 1958. Stilbestrol responses in lambs fed rations differing in calorie to protein ratios. J. Anim. Sci. 17: 140–151.CrossRefGoogle Scholar
Scottish Agricultural Colleges. 1978. Nutrient allowances for cattle and sheep. Publ. Scott. Agric. Colls, No. 29.Google Scholar
Slen, S. B. and Connell, R. 1958. Wool growth in sheep as affected by the administration of certain sex hormones. Can. J. Anim. Sci. 38: 38–47.CrossRefGoogle Scholar
Trenkle, A. 1976. The anabolic effect of estrogens on nitrogen metabolism of growing and finishing cattle and sheep. In Anabolic Agents in Animal Production. EQS Suppl., Vol. V. (ed. Coulston, F. and Korte, F.), pp. 79–88. George Thieme, Stuttgart.Google Scholar
Vernon, B. G. and Buttery, P. J. 1978. Protein metabolism of rats treated with trienbolone acetate. Anim. Prod. 26: 1–9.Google Scholar