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The effect of daylength on the growth of lambs 2. Blood concentrations of growth hormone, prolactin, insulin and thyroxine, and the effect of feeding

Published online by Cambridge University Press:  02 September 2010

J. M. Forbes ,
P. M. Driver ,
Wendy B. Brown ,
C. G. Scanes  and
I. C. Hart
J. M. Forbes
Affiliation:
Department of Animal Physiology and Nutrition, University of Leeds, Leeds LS2 9JT
P. M. Driver
Affiliation:
Department of Animal Physiology and Nutrition, University of Leeds, Leeds LS2 9JT
Wendy B. Brown
Affiliation:
Department of Animal Physiology and Nutrition, University of Leeds, Leeds LS2 9JT
C. G. Scanes
Affiliation:
Department of Animal Physiology and Nutrition, University of Leeds, Leeds LS2 9JT
I. C. Hart
Affiliation:
National Institute for Research in Dairying, Shinfield, Reading RG2 9AT
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Abstract

1. The levels of four hormones which might be involved in the control of growth have been measured in the blood of lambs kept in 16 or 8 h daylengths for 4 months in each of two experiments. Under the conditions of these experiments long daylength stimulated growth.

2. Prolactin concentration was significantly increased by long day-length and by ad libitum feeding, compared with short daylength and restricted feeding, respectively.

3. Growth hormone, insulin and thyroxine concentrations were unaffected by daylength. Ad libitum feeding caused lower growth hormone and higher insulin concentrations than restricted feeding, and growth hormone levels fell after the morning feed.

4. Of the hormones measured, prolactin is most worthy of further study as a possible mediator of the effects of long daylength on growth.

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Type
Research Article
Information
Animal Production , Volume 29 , Issue 1 , August 1979 , pp. 43 - 51
Copyright
Copyright © British Society of Animal Science 1979

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References

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