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Changes occurring in cattle as a consequence of selection for growth rate in a stressful environment

Published online by Cambridge University Press:  27 March 2009

J. E. Frisch
J. E. Frisch
Affiliation:
C.S.I.R.O., Tropical Cattle Research Centre, P.O. Box 542, Rockhampton, Queensland 4700, Australia
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Summary

Since 1966 a closed line of Hereford × Shorthorn cattle (selected line) has been selected principally for growth rate under conditions of moderate to high environmental stress. Responses in growth rate were measured over the years 1970–5 as differences from an unselected control line. Birth weight declined but live weight at all other ages increased.

Groups of animals were taken from each line in 1976 and 1977 and used to determine the reasons for the differences in growth rate. Growth rate of the groups was measured when they were exposed to several different levels of stress, namely, the plane of nutrition, high ambient temperature, infection with bovine infectious keratoconjunctivitis(BIK) or gastro-intestinal helminths. The selected line was shown to be more heat tolerant, to have lower maintenance requirements and greater resistance to infection with BIK and helminths and, in consequence, always had higher growth rates in the presence of these stresses. However, they did not have superior growth rate at low levels of these stresses. Thus, selection had not increased the components associated with growth potential, and the improvement in growth rate was achieved entirely through increases in resistance to environmental stresses which affected growth rate.

The application of these findings to selection for growth rate, particularly in harsh environments, is discussed.

Type
Research Article
Information
The Journal of Agricultural Science , Volume 96 , Issue 1 , February 1981 , pp. 23 - 38
Copyright
Copyright © Cambridge University Press 1981

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