Persistence of autozygosity in crossbreds between autochthonous and cosmopolitan breeds of swine: a simulation study.

Autor: Fabbri MC; Dipartimento di Scienze e Tecnologie Agrarie, Alimentari, Ambientali e Forestali, Università di Firenze, Firenze, Italy. Electronic address: mariachiara.fabbri@unifi.it., Lozada-Soto E; Department of Animal Science, North Carolina State University, Raleigh, NC 27695, United States., Tiezzi F; Dipartimento di Scienze e Tecnologie Agrarie, Alimentari, Ambientali e Forestali, Università di Firenze, Firenze, Italy., Čandek-Potokar M; Kmetijski Inštitut Slovenije, Hacquetova ulica 17, 1000 Ljubljana, Slovenia., Bovo S; Department of Agricultural and Food Sciences, Division of Animal Sciences, University of Bologna, Viale G. Fanin 46, 40127 Bologna, Italy., Schiavo G; Department of Agricultural and Food Sciences, Division of Animal Sciences, University of Bologna, Viale G. Fanin 46, 40127 Bologna, Italy., Fontanesi L; Department of Agricultural and Food Sciences, Division of Animal Sciences, University of Bologna, Viale G. Fanin 46, 40127 Bologna, Italy., Muñoz M; Departamento Mejora Genética Animal, INIA-CSIC, Crta. de la Coruña, km. 7,5, 28040 Madrid, Spain., Ovilo C; Departamento Mejora Genética Animal, INIA-CSIC, Crta. de la Coruña, km. 7,5, 28040 Madrid, Spain., Bozzi R; Dipartimento di Scienze e Tecnologie Agrarie, Alimentari, Ambientali e Forestali, Università di Firenze, Firenze, Italy.
Jazyk: angličtina
Zdroj: Animal : an international journal of animal bioscience [Animal] 2024 Feb; Vol. 18 (2), pp. 101070. Date of Electronic Publication: 2024 Jan 22.
DOI: 10.1016/j.animal.2023.101070
Abstrakt: Crossbreeding might be a valid strategy to valorize local pig breeds. Crossbreeding should reduce homozygosity and, as a consequence, yield hybrid vigor for fitness and production traits. This study aimed to quantify the persistence of autozygosity in terminal crossbred pigs compared with purebreds and, in turn, identify genomic regions where autozygosity's persistence would not be found. The study was based on genotyping data from 20 European local pig breeds and three cosmopolitan pig breeds used to simulate crossbred offspring. This study consisted of two steps. First, one hundred matings were simulated for each pairwise combination of the 23 considered breeds (for a total of 276 combinations), ignoring the sex of the parent individuals in order to generate purebred and crossbred matings leveraging all the germplasm available. Second, a few preselected terminal-maternal breed pairs were used to mimic a realistic terminal crossbreeding system: (i) Mora Romagnola (boars) or Cinta Senese (boars) crossed with Large White (sows) or Landrace (sows); (ii) Duroc (boars) crossed with Mora Romagnola (sows) or Cinta Senese (sows). Runs of homozygosity was used to estimate genome-wide autozygosity (F ROH ). Observed F ROH was higher in purebreds than in crossbreds, although some crossbred combinations showed higher F ROH than other purebred combinations. Among the purebreds, the highest F ROH values were observed in Mora Romagnola and Turopolje (0.50 and 0.46, respectively). F ROH ranged from 0.04 to 0.16 in the crossbreds Alentejana × Large White and Alentejana × Iberian, respectively. Persistence of autozygosity was found in several genomic segments harboring regions where quantitative trait loci (QTLs) were found in the literature. The regions were enriched in QTLs involved in fatty acid metabolism and associated with performance traits. This simulation shows that autozygosity persists in most breed combinations of terminal crosses. Results suggest that a strategy for crossbreeding is implemented when leveraging autochthonous and cosmopolitan breeds to obtain most of the hybrid vigor.
(Copyright © 2023 The Author(s). Published by Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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