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Effect of different doses of 17β-oestradiol on growth and carcass composition of wether and ewe lambs

Published online by Cambridge University Press:  27 March 2009

J. J. Bass ,
P. J. Fowke ,
D. M. Duganzich  and
A. J. Peterson
J. J. Bass
Affiliation:
Ruakura Agricultural Centre, Private Bag, Hamilton, New Zealand
P. J. Fowke
Affiliation:
Ruakura Agricultural Centre, Private Bag, Hamilton, New Zealand
D. M. Duganzich
Affiliation:
Ruakura Agricultural Centre, Private Bag, Hamilton, New Zealand
A. J. Peterson
Affiliation:
Ruakura Agricultural Centre, Private Bag, Hamilton, New Zealand
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Summary

Silastic implants of different lengths (0·5–4 cm) containing oestradiol were implanted in wether or ewe lambs, which were slaughtered at 14 or 23 weeks of age. Live weight gain and carcass weight of lambs was increased marginally by oestradiol treatment. Oestradiol decreased the percentage of fat in the carcass, while increasing the percentage of carcass water. Older lambs had a greater response to oestradiol treatment for the weights of the carcass protein and ash. The female reproductive system was affected by oestradiol with the ovarian weights being depressed and the uterine weights increasing. The uterus was especially sensitive to oestradiol at 14 weeks of age. Oestradiol increased the weight of protein in lamb carcasses, especially in the older lambs of this study.

Type
Review
Information
The Journal of Agricultural Science , Volume 113 , Issue 2 , October 1989 , pp. 183 - 187
Copyright
Copyright © Cambridge University Press 1989

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References

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