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Further studies of hexoestrol implantation of Blackface wether lambs

  • R. H. Armstrong (a1) and A. E. Cameron (a1)


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.



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Armstrong, R. H., & Cameron, A. E., 1959. Hexoestrol implantation of Blackface wether lambs. Anim. Prod., 1: 37.
Averill, R. L. W., 1955. The use of oestrogens in fat lamb production. Proc. Brit. Soc. Anim. Prod., 1955: 18.
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.
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.
Lamming, G. E., 1958. Recent developments in the use of growth stimulants in farm animals. J. Roy. agric. Soc. Engl., 119: 41.
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.
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.

Further studies of hexoestrol implantation of Blackface wether lambs

  • R. H. Armstrong (a1) and A. E. Cameron (a1)


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