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Journal of Animal Science, Vol 79, Issue 1 68-72, Copyright © 2001 by American Society of Animal Science

JOURNAL ARTICLE

Putative quantitative trait locus affecting birth weight on bovine chromosome 2

M. D. Grosz and M. D. MacNeil
USDA-ARS, Fort Keogh LARRL, Miles City, MT 59301, USA. mgrosz@genomicFX.com

A genome scan for chromosomal regions influencing birth weight was performed using 151 progeny of a single Hereford x composite bull and 170 microsatellite markers spanning 2.497 morgans on 29 bovine autosomes. A QTL was identified at the telomeric end of bovine chromosome 2 (maximum effect at 114 cM) accounting for approximately 2.8 kg of birth weight or 0.64 residual standard deviations (after adjustment for sex of calf, age of dam, and breed of dam). No significant effect on growth from birth to weaning was detected in this region. The presence of this QTL within a resource herd composed of breeds common to the Northern Great Plains provides an opportunity to initiate marker-assisted selection to reduce birth weight with minimal effect on postnatal growth. Thus, potentially the amount and degree of dystocia can be reduced and the economic loss associated with calving difficulty lessened without compromise of subsequent growth performance. In addition, this finding indicates that significant genetic variation for birth weight (and presumably other production-related traits) exists within herds composed of commercially adapted Bos taurus germplasm.


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