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A note on annual variation of plasma insulin-like growth factor-I concentrations and growth rates of Jersey heifers differing in genetic merit for milk production

Published online by Cambridge University Press:  02 September 2010

S. R. Davis ,
V. C. Farr ,
P. D. Gluckman  and
B. H. Breier
S. R. Davis
Affiliation:
Ministry of Agriculture and Fisheries, Ruakura Agricultural Centre, Hamilton, New Zealand
V. C. Farr
Affiliation:
Ministry of Agriculture and Fisheries, Ruakura Agricultural Centre, Hamilton, New Zealand
P. D. Gluckman
Affiliation:
School of Medicine, University of Auckland, Auckland, New Zealand
B. H. Breier
Affiliation:
School of Medicine, University of Auckland, Auckland, New Zealand
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Abstract

A study was made of the concentration of insulin-like growth factor-l (IGF-I) in the plasma of Jersey cows differing in genetic merit for milk and milk fat production. Plasma IGF-I concentrations exhibited an annual cycle and from this study it is concluded that, in the Jersey breed, selection for increased milk and milk fat production, with the correlated responses of increases in mature live weight and live-weight gain, will not be accompanied by increased plasma IGF-I concentration.

Type
Notes
Information
Animal Production , Volume 48 , Issue 2 , April 1989 , pp. 467 - 470
Copyright
Copyright © British Society of Animal Science 1989

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References

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