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Individuality and heritability of the blood composition of calves with particular reference to the selection of stock with improved growth potential

Published online by Cambridge University Press:  27 March 2009

G. J. Rowlands ,
J. M. Payne ,
Sally M. Dew  and
R. Manston
G. J. Rowlands
Affiliation:
Agricultural Research Council, Institute for Research on Animal Diseases, Compton, Newbury, Berkshire
J. M. Payne
Affiliation:
Agricultural Research Council, Institute for Research on Animal Diseases, Compton, Newbury, Berkshire
Sally M. Dew
Affiliation:
Agricultural Research Council, Institute for Research on Animal Diseases, Compton, Newbury, Berkshire
R. Manston
Affiliation:
Agricultural Research Council, Institute for Research on Animal Diseases, Compton, Newbury, Berkshire
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Summary

Blood samples, taken from each of 231 calves on three occasions at 9,10 and 11 weeks of age, were analysed for packed cell volume, blood glucose and Hb; and serum albumin, urea nitrogen, total protein, Ca, inorganic phosphate, Mg, K, Na and Cu. Differences in the blood composition for individual calves were demonstrated for all blood constituents (P < 0·01) with variations among calves proportionally largest for albumin and smallest for sodium. Concentrations of glucose, Hb and K were inherited (heritability estimates > 0·4).

There were significant correlations (P < 0·001) between the calves' growth rates from 1 to 12 weeks and the concentrations of each of the blood constituents, glucose Hb, K, Na, albumin and inorganic phosphate; in the cases of Na and albumin, comparison of the blood analysis at 9–11 weeks with body weights at 6 and 9 months showed that these correlations persisted, and that by 9 months differences in concentrations of Na and albumin among individuals were associated with an average difference of as much as 55 kg in body weight.

The evidence that concentrations of certain blood constituents are both inherited and related to growth rate suggests that not only might calves be screened early in life for indications of rapid growth rate, but also that animals might be bred to have the blood characteristics indicative of this quality.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 82 , Issue 3 , June 1974 , pp. 473 - 481
Copyright
Copyright © Cambridge University Press 1974

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References

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