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The effect of different oestrogens and oestradiol plus progesterone on the growth and carcass characteristics of fattening male hoggets

Published online by Cambridge University Press:  01 June 1961

W. R. Shorthose  and
G. E. Lamming
W. R. Shorthose
Affiliation:
University of Nottingham, School of Agriculture, Sutton Bonington
G. E. Lamming
Affiliation:
University of Nottingham, School of Agriculture, Sutton Bonington
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Extract

A comparison has been made in five flocks with a total of 473 sheep of the effect of 15 mg. diethylstilboestrol (DES.) as a paste, 15 mg. hexoestrol as an implant, and 5·0 mg. oestradiol benzoate plus 50 mg. progesterone (O.+P.) as two implants, on the growth rate and slaughter characteristics and carcass grading of fattening male hoggets.

In those flocks where the plane of nutrition was adequate, all hormone treatments resulted in a significant increase in live-weight gain. During the first 24–40 days, DES. paste resulted in significantly greater daily live-weight gain compared to hexoestrol or O.+P. in two out of five flocks, but over the whole period there were no significant differences between these treatments. In one flock which was on a lower plane of nutrition there were no significant effects of hormone treatment.

The hormone treatments resulted in extra carcass weight, extra pelt weight but no change in killing-out percentage or in carcass grade. There were no significant differences between treatments in the slaughter characteristics studied.

Type
Research Article
Information
Animal Production , Volume 3 , Issue 2 , June 1961 , pp. 183 - 193
Copyright
Copyright © British Society of Animal Science 1961

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References

REFERENCES

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