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Selection for rate and efficiency of lean gain in Hereford cattle. 2. Evaluation of correlated responses

Published online by Cambridge University Press:  02 September 2010

R. A. Mrode ,
C. Smith  and
R. Thompson
R. A. Mrode
Affiliation:
ARFC Institute of Animal Physiology and Genetics Research, Roslin, Midlothian EH25 9PS
C. Smith
Affiliation:
Department of Animal and Poultry Science, University of Guelph, Ontario, Canada N1G 2W1
R. Thompson
Affiliation:
ARFC Institute of Animal Physiology and Genetics Research, Roslin, Midlothian EH25 9PS
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Abstract

Correlated responses in two lines of Hereford cattle selected for lean growth rate (LGR) from birth to 400 days of age and lean food conversion ratio (LFCR) from 200 to 400 days of age for a period of 8 years were evaluated. Correlated changes were estimated by two methods: deviation of selected lines from a control line and restricted maximum likelihood. Generally, estimates from the two methods were similar but tended to be more precise for the latter. Statistically significant correlated responses occurred in growth rate in the LGR line and in lean proportion and food conversion ratio in both selected lines. Selection for LGR was accompanied by increases in body weight at various ages in both male and female progeny. In the LFCR line there were little or no changes in body weight for male calves but some increases at certain ages for female progeny. There were no adverse correlated responses detected in reproductive traits such as calving difficulty and calving and pre-weaning mortality.

Keywords

beef cattlebody lean massselection
Type
Research Article
Information
Animal Production , Volume 51 , Issue 1 , August 1990 , pp. 35 - 46
Copyright
Copyright © British Society of Animal Science 1990

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