Genetic Distinctness and Diversity of American Aberdeen Cattle Compared to Common Beef Breeds in the United States
Author:
Bhowmik Nayan1ORCID, Seaborn Travis2ORCID, Ringwall Kris A.3, Dahlen Carl R.1ORCID, Swanson Kendall C.1ORCID, Hulsman Hanna Lauren L.1ORCID
Affiliation:
1. Department of Animal Sciences, North Dakota State University, Fargo, ND 58108, USA 2. School of Natural Resource Sciences, North Dakota State University, Fargo, ND 58108, USA 3. Dickinson Research Extension Center, North Dakota State University, Dickinson, ND 58601, USA
Abstract
American Aberdeen (AD) cattle in the USA descend from an Aberdeen Angus herd originally brought to the Trangie Agricultural Research Centre, New South Wales, AUS. Although put under specific selection pressure for yearling growth rate, AD remain genomically uncharacterized. The objective was to characterize the genetic diversity and structure of purebred and crossbred AD cattle relative to seven common USA beef breeds using available whole-genome SNP data. A total of 1140 animals consisting of 404 purebred (n = 8 types) and 736 admixed individuals (n = 10 types) was used. Genetic diversity metrics, an analysis of molecular variance, and a discriminant analysis of principal components were employed. When linkage disequilibrium was not accounted for, markers influenced basic diversity parameter estimates, especially for AD cattle. Even so, intrapopulation and interpopulation estimates separate AD cattle from other purebred types (e.g., Latter’s pairwise FST ranged from 0.1129 to 0.2209), where AD cattle were less heterozygous and had lower allelic richness than other purebred types. The admixed AD-influenced cattle were intermediate to other admixed types for similar parameters. The diversity metrics separation and differences support strong artificial selection pressures during and after AD breed development, shaping the evolution of the breed and making them genomically distinct from similar breeds.
Funder
National Institute of General Medical Sciences United States Department of Agriculture North Dakota Agricultural Experiment Station North Dakota State University Dickinson Research Extension Center
Subject
Genetics (clinical),Genetics
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