Cited by 6Genetic and phenotypic traits in livestockGenetic Mapping and Diversity in Plants and AnimalsLivestock Farming and Management

Taurine and Indicine Haplotype Representation in Advanced Generation Individuals From Three American Breeds

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Crum, Tamar E., Schnabel, Robert D., Decker, Jared E., Taylor, Jeremy F.·2021·Frontiers in Genetics

Abstract

Development of the American Breeds of beef cattle began in the 1920s as breeders and U. S. Experiment Station researchers began to create Bos taurus taurus × Bos taurus indicus hybrids using Brahman as the B. t. indicus source. By 1954, U.S. Breed Associations had been formed for Brangus (5/8 Angus × 3/8 Brahman), Beefmaster (½ Brahman × ¼ Shorthorn × ¼ Hereford), and Santa Gertrudis (5/8 Shorthorn × 3/8 Brahman). While these breeds were developed using mating designs expected to create base generation animals with the required genome contributions from progenitor breeds, each association has now registered advanced generation animals in which selection or drift may have caused the realized genome compositions to differ from initial expected proportions. The availability of high-density SNP genotypes for 9,161 Brangus, 3,762 Beefmaster, and 1,942 Santa Gertrudis animals allowed us to compare the realized genomic architectures of breed members to the base generation expectations. We used RFMix to estimate local ancestry and identify genomic regions in which the proportion of Brahman ancestry differed significantly from a priori expectations. For all three breeds, lower than expected levels of Brahman composition were found genome-wide, particularly in early-generation animals where we demonstrate that selection on beef production traits was likely responsible for the taurine enrichment. Using a proxy for generation number, we also contrasted the genomes of early- and advanced-generation animals and found that the indicine composition of the genome has increased with generation number likely due to selection on adaptive traits. Many of the most-highly differentiated genomic regions were breed specific, suggesting that differences in breeding objectives and selection intensities exist between the breeds. Global ancestry estimation is commonly performed in admixed animals to control for stratification in association studies. However, local ancestry estimation provides the opportunity to investigate the evolution of specific chromosomal segments and estimate haplotype effects on trait variation in admixed individuals. Investigating the genomic architecture of the American Breeds not only allows the estimation of indicine and taurine genome proportions genome-wide, but also the locations within the genome where either taurine or indicine alleles confer a selective advantage.

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  • To enhance productivity, particularly heat tolerance and disease resistance, zebu breeds such as Kankrej, Ongole, and Gir were introduced from 1813 onwards, later yielding the Brahman favoured in tropical regions and indicine × taurine crossbreds such as the Beefmaster.

    “To enhance productivity, particularly heat tolerance and disease resistance, zebu breeds such as Kankrej, Ongole, and Gir were introduced from 1813 onwards, later yielding the Brahman favoured in tropical regions and indicine × taurine crossbreds such as the Beefmaster [59,68].”

    From The Genomic Landscape of Cattle: Domestication, Dispersal, and Adaptive Evolution (2026) · cites this paper as [68]

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Authors
Crum, T. E., Schnabel, R. D., Decker, J. E., & Taylor, J. F.
Affiliations
University of Missouri (US)
Corresponding author
  • Crum, Tamar E.
  • Taylor, Jeremy F.
Venue
Frontiers in Genetics
Published
2021-10-18
Volume
12
Pages
758394-758394
ISSN
1664-8021 (ISSN-L)
OpenAlex
W3207783846
Cited by
6
References
158
Citations by year
2026: 3 · 2025: 2 · 2022: 1
FWCI
0.14
Type
journal article
Language
en
Open access
Locations
  • Frontiers in Genetics (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, other-oa)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
U.S. Department of Agriculture
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic and phenotypic traits in livestock
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Genetic Mapping and Diversity in Plants and Animals
  • Life Sciences › Agricultural and Biological Sciences › Agronomy and Crop Science › Livestock Farming and Management
Keywords
local ancestry, admixture, Brangus, Santa Gertrudis, adaptive traits, haplotype effects, SNP genotypes

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