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Evaluating the genetic architecture of the Japanese Wagyu breed within the United States

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dc.contributor.authorHeffernan, Kathryn, author
dc.contributor.authorSpeidel, Scott E., advisor
dc.contributor.authorThomas, Milt, committee member
dc.contributor.authorEnns, Mark, committee member
dc.contributor.authorBlackburn, Harvey, committee member
dc.contributor.authorHolt, Timothy, committee member
dc.date.accessioned2022-08-29T10:16:23Z
dc.date.available2022-08-29T10:16:23Z
dc.date.issued2022
dc.description.abstractThe objective of this thesis is to better understand the genetic architecture of Japanese Wagyu cattle in the United States to improve on current breeding strategies, as well as help to develop new strategies to increase the genetic diversity of the U.S. Wagyu population. For this study, pedigree data (n = 48) were collected on full-blood Japanese Wagyu sires and dams, and high-density genotype data (n = 414) were collected on Japanese Wagyu, Ayrshire, Brahman, Brangus, Devon, Holstein, Milking Devon, Milking Shorthorn, Shorthorn, Simmental, South Devon, Angus, Jersey Island, and Brown Swiss cattle. Inbreeding coefficients were calculated from the pedigree data and averaged 0.19, with a minimum coefficient of zero, max coefficient of 0.43, and a standard deviation of 0.08. Using the genotypes, a principal component analysis (PCA), an admixture graph, and a phylogenetic tree were computed to ascertain the population structure and breed composition of modern Japanese Wagyu cattle in relation to other breeds. The majority of the Japanese Wagyu had an elongated dispersal that overlapped with the origin of the PCA graph. Japanese Wagyu also averaged 85.5% indicine influence as indicated by the admixture graph, and the phylogenetic tree showed Japanese Wagyu as the closest branch to the root breed Brahman. These results suggest that Japanese Wagyu are an inbred population. While mostly Bos indicus, these results suggest that Japanese Wagyu are admixed with low percentages of Bos taurus breeds such as Simmental and Brown Swiss.
dc.format.mediumborn digital
dc.format.mediummasters theses
dc.identifierHeffernan_colostate_0053N_17402.pdf
dc.identifier.urihttps://hdl.handle.net/10217/235651
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relation.ispartof2020-
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.subjectJapanese Wagyu
dc.subjectinbreeding
dc.subjectpopulation genetics
dc.titleEvaluating the genetic architecture of the Japanese Wagyu breed within the United States
dc.typeText
dcterms.rights.dplaThis Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
thesis.degree.disciplineAnimal Sciences
thesis.degree.grantorColorado State University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science (M.S.)

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