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Field trials on hexoestrol implantation of steers on New Zealand farms

Published online by Cambridge University Press:  27 March 2009

G. C. Everitt  and
A. H. Carter
G. C. Everitt
Affiliation:
Ruakura Animal Research Station, Hamilton, New Zealand
A. H. Carter
Affiliation:
Ruakura Animal Research Station, Hamilton, New Zealand
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Extract

Field trials on hexoestrol implantation were conducted in the Waikato area of the North Island of New Zealand during 1958–59, involving 260 two and three year old Aberdeen Angus steers from nine farms. Two levels of hormone implantation were studied, namely, 30 and 45 mg. The trials ranged in duration from three to five months with an average of four months.

Pronounced differences were apparent between farms in the overall growth rates and carcass quality scores of the cattle.

Hexoestrol implantation led to a significant increase in carcass weight, estimated at approximately 22 lb., with little evidence of real differences between farms in the average response to the hormone.

Response to the higher as compared with the lower dose of hexoestrol varied markedly among the separate farms. In general, the lower dose of 30 mg. tended to yield the greater increase in carcass weight.

A small, but consistent, depression of carcass quality scores was manifest under hormone treatment, with no real differences between the two dosage levels.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 60 , Issue 1 , February 1963 , pp. 87 - 93
Copyright
Copyright © Cambridge University Press 1963

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References

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