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520. The effect of feeding iodinated casein and L-thyroxine upon the health, reproduction and yield of a dual-purpose breed of cattle and a purely dairy breed

Published online by Cambridge University Press:  01 June 2009

J. N. Aitken ,
A. W. Boyne  and
J. A. Crichton
J. N. Aitken
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeenshire
A. W. Boyne
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeenshire
J. A. Crichton
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeenshire
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Extract

1. Iodinated casein or L-thyroxine, under the conditions of this experiment, had no adverse effect on the general health of a dual purpose (Red Poll) or a dairy breed (Ayrshire) of cattle.

2. The treatment did not increase the total milk or butter-fat production.

3. The treated animals did significantly better than the controls in one lactation only and in the following variables only: (a) daily milk yield adjusted for pre-treatment differences—Red Polls, lact. 1; (b) milk yield for duration of treatment adjusted for pre-treatment differences—Red Polls, lact. 1.

Type
Original Articles
Information
Journal of Dairy Research , Volume 20 , Issue 3 , October 1953 , pp. 291 - 300
Copyright
Copyright © Proprietors of Journal of Dairy Research 1953

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References

REFERENCES

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