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Methods of analysing the effect of season of birth on weaning weight in a zebu × temperate beef herd in Kenya

Published online by Cambridge University Press:  02 September 2010

A. B. Carles  and
Janet Riley
A. B. Carles
Affiliation:
Department of Animal Production, University of Nairobi, PO Box 29053, Kabete, Kenya
Janet Riley
Affiliation:
Statistics Department, Rothamsted Experimental Station, Harpenden, Hertfordshire AL5 2JQ
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Abstract

A study was made of weaning weights in a beef herd, using a rotational crossbreeding system including the Boran breed (zebu) and two temperate beef breeds (Devon and Limousin), and a seasonal calving period spanning the onset of the rains.

Significant sources of variation in calf weaning weights were crossbred type, age at weaning, sex, dam's age, season of birth, year and a year × crossbred type interaction (all P < 0·001).

The adjusted mean weaning weight was 203 kg. Weaners sired by a temperate bull were generally 1·08 times the weight of those sired by a zebu bull. Steers were 1·06 times the weight of heifers. Marked increases in weaning weights occurred as dams increased in age from 3 to 6 years and slight increases continued up to 9 years of age. Weaners born to 9-year-old cows were 1·09 times the weight of those from first calvers.

Alternative methods for investigating the effect of season of birth were examined and the final choice was a covariate for time from birth to the onset of the rains. Calves born in the earliest part of the calving period were approximately 1·14 times the weight of those born just after the onset of the rains.

Type
Research Article
Information
Animal Production , Volume 38 , Issue 3 , June 1984 , pp. 429 - 437
Copyright
Copyright © British Society of Animal Science 1984

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References

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