Hostname: page-component-78c5997874-lj6df Total loading time: 0 Render date: 2024-11-05T16:50:29.341Z Has data issue: false hasContentIssue false
  • English
  • Français

Further studies of hexoestrol implantation of Blackface wether lambs

Published online by Cambridge University Press:  01 October 1961

R. H. Armstrong  and
A. E. Cameron
R. H. Armstrong
Affiliation:
Hill Farming Research Organisation, Edinburgh
A. E. Cameron
Affiliation:
Hill Farming Research Organisation, Edinburgh
Get access

Extract

1. In the summer of 1958, 15 mg. of hexoestrol was administered to Blackface wether lambs in one of the following ways; 5 mg. before weaning followed by two 5 mg. tablets at weaning, three 5 mg. tablets at weaning, and thirdly a single 15 mg. tablet at weaning. In a further series of experiments in 1959 the effect of both raising the pre-weaning implantation to 10 mg., and the total hexoestrol dosage to 20 mg. was studied.

2. Suckled lambs implanted with 5 mg. of hexoestrol at the milk clip gained significantly more in live-weight (18%) up to weaning in 1958 than did untreated lambs; in 1959 the difference was only 11%.

3. Between weaning and the end of the trial all treatments with the exception of that in which hexoestrol dosage was raised to 20 mg. showed a very highly significant increase in live-weight gain over untreated lambs, the increases ranging from 26 % to 54%.

4. In neither year was the overall gain in live-weight from pre-weaning to the end of the trial significantly increased by implanting part of the hexoestrol dose prior to weaning.

5. Live-weight gain of the lambs was not significantly increased when three 5 mg. tablets of hexoestrol replaced a single 15 mg. tablet.

6. The implanting of lambs with 20 mg. hexoestrol failed to give a response superior to that obtained with 15 mg. hexoestrol.

7. Each group of lambs receiving hexoestrol treatment showed an increased average carcass weight.

Type
Research Article
Information
Animal Production , Volume 3 , Issue 3 , October 1961 , pp. 295 - 300
Copyright
Copyright © British Society of Animal Science 1961

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

Armstrong, R. H., & Cameron, A. E., 1959. Hexoestrol implantation of Blackface wether lambs. Anim. Prod., 1: 37.Google Scholar
Averill, R. L. W., 1955. The use of oestrogens in fat lamb production. Proc. Brit. Soc. Anim. Prod., 1955: 18.CrossRefGoogle Scholar
Burgess, T. D., & Lamming, G. E., 1960. The effect of hormones on growth rate and carcass quality of fattening lambs and hoggets. Anim. Prod., 2: 83.Google Scholar
Gee, I., & Preston, T. R., 1957. The effect of hexoestrol implantation on carcass composition and efficiency of food utilisation in fattening lambs. Brit. J. Nutr., 11: 329.CrossRefGoogle ScholarPubMed
Lamming, G. E., 1958. Recent developments in the use of growth stimulants in farm animals. J. Roy. agric. Soc. Engl., 119: 41.Google Scholar
Preston, T. R. & Gee, I., 1958. The influence of the route of administration on the effect of hexoestrol on fattening wether lambs. Brit. J. Nutr., 12: 158.Google Scholar
Preston, T. R., Greenhalgh, I., & Macleod, N. A., 1959. The effect of hexoestrol implants on sucking and weaned lambs fattened on farms in the north-east of Scotland. Anim. Prod., 1: 135.Google Scholar