Abstract

The objective of this work was to identify QTLs for liveweight in a candidate region of bovine chromosome 5. Half-sib families from two lines, one traditional and the other new, of Canchim beef cattle (5/8 Charolais + 3/8 Zebu) were genotyped for four microsatellite markers, including the microsatellite in the IGF-1 (insulin-like growth factor-1) promoter region. Significant differences in allele distribution between the two lines were found for three markers. Interval mapping analyses in this region indicated the presence of a QTL controlling birth weight (p < 0.05) and of a QTL influencing breeding value for yearling weight (p < 0.01) in the newer line of the breed. The previously identified interaction between the IGF-1 genotype and genetic group strengthens the hypothesis of a linked QTL rather than an IGF-1 effect on growth traits in the Canchim cattle.

Highlights

  • Crosses between cattle breeds exploit complementarity and the benefits of heterosis to allow the formation of new breeds with suitable traits for a particular environment

  • In Brazil, the Canchim breed combines the precocity and productivity of Charolais beef cattle with the rusticity and adaptability to the tropics of Zebu cattle, and has been used for meat production since its formation in the 1950s. This breed is an important alternative for low-tomoderate input beef cattle production systems in the tropics

  • This analysis was done to select markers adjacent to the IGF-1 gene that were informative in the largest number of sires, that did not yield spurious bands, and that allowed an appropriate coverage of the chromosomal segment

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Summary

Introduction

Crosses between cattle breeds exploit complementarity and the benefits of heterosis to allow the formation of new breeds with suitable traits for a particular environment. In Brazil, the Canchim breed combines the precocity and productivity of Charolais beef cattle with the rusticity and adaptability to the tropics of Zebu cattle, and has been used for meat production since its formation in the 1950s. This breed is an important alternative for low-tomoderate input beef cattle production systems in the tropics. The combined use of marker-QTL linkage and breeding values can significantly increase the efficiency of animal selection, and thereby increase the genetic progress in a given period of time

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