Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/18910
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dc.contributor.authorBunter, Kim Len
dc.contributor.authorLewis, C R Gen
dc.contributor.authorNewman, Sen
dc.date.accessioned2016-04-22T15:48:00Z-
dc.date.issued2015-
dc.identifier.citationJournal of Animal Science, 93(8), p. 3783-3793en
dc.identifier.issn1525-3163en
dc.identifier.issn0021-8812en
dc.identifier.urihttps://hdl.handle.net/1959.11/18910-
dc.description.abstractGroup housing of gestating sows has implications for reproductive performance due to detrimental interactions between sows within groups. Reproductive records ('n' = 10,748) were obtained for 8,444 pedigreed nucleus sows housed in a single facility, formed into 1,827 static groups during gestation. Only data from complete groups were used to estimate genetic parameters for total born (TB), number born alive (NBA), and gestation length (GL) and to compare models extended to account for group effects. Censored data for sows which did not farrow (0.8% of records) were augmented with biologically meaningful values. Group sizes ranged from 2 to 10, in pens designed to hold 4, 8, or 10 sows per pen. Sows were grouped by parity, line, and mating date after d 35 of pregnancy. Heritability estimates were generally constant across all model alternatives at 0.11 ± 0.02 for TB and NBA and 0.32 ± 0.03 for GL. However, models for all traits were significantly ('P' < 0.05) improved through inclusion of terms for nongenetic group and social genetic effects (SGE). Group effects were no longer significant in models containing both terms. The proportional contributions of SGE (s²) to phenotypic variances were very low (<0.002 across traits), but their contributions to calculated total genetic variance (T²) were significant. The differences between h² and T² ranged between 3 and 5% under simple models, increasing to 8 to 14% in models accounting for both covariances between additive direct (A) and SGE and the effects of varying group size on the magnitude of estimates for SGE. Estimates of covariance between A and SGE were sensitive to the modeling of dilution factors for group size. The models of best fit for litter size traits used a customized dilution based on sows/pen relative to the maximum sows/ pen. The best model supported a reduction in SGE with increased space per sow, independent of maximum group size, and no significant correlation between A and SGE. The latter is expected if A and SGE reflect different trait complexes. It is suggested that the SGE estimated for reproductive traits represented the expression of an unobserved phenotype, such as sow aggression, of an individual on its pen mates. Further investigation into the use of competitive effects models for genetic evaluation of reproductive traits for grouphoused sows could be considered a strategy to improve welfare and performance of group-housed sows.en
dc.languageenen
dc.publisherAmerican Society of Animal Scienceen
dc.relation.ispartofJournal of Animal Scienceen
dc.titleSocial genetic effects influence reproductive performance of group-housed sowsen
dc.typeJournal Articleen
dc.identifier.doi10.2527/jas.2015-9111en
dc.subject.keywordsAnimal Breedingen
local.contributor.firstnameKim Len
local.contributor.firstnameC R Gen
local.contributor.firstnameSen
local.subject.for2008070201 Animal Breedingen
local.subject.seo2008830308 Pigsen
local.profile.schoolAnimal Genetics and Breeding Uniten
local.profile.emailkbunter2@une.edu.auen
local.output.categoryC1en
local.record.placeauen
local.record.institutionUniversity of New Englanden
local.identifier.epublicationsrecordune-20160414-130213en
local.publisher.placeUnited States of Americaen
local.format.startpage3783en
local.format.endpage3793en
local.identifier.scopusid84975842460en
local.peerreviewedYesen
local.identifier.volume93en
local.identifier.issue8en
local.contributor.lastnameBunteren
local.contributor.lastnameLewisen
local.contributor.lastnameNewmanen
dc.identifier.staffune-id:kbunter2en
local.profile.roleauthoren
local.profile.roleauthoren
local.profile.roleauthoren
local.identifier.unepublicationidune:19110en
dc.identifier.academiclevelAcademicen
local.title.maintitleSocial genetic effects influence reproductive performance of group-housed sowsen
local.output.categorydescriptionC1 Refereed Article in a Scholarly Journalen
local.search.authorBunter, Kim Len
local.search.authorLewis, C R Gen
local.search.authorNewman, Sen
local.uneassociationUnknownen
local.identifier.wosid000365171300005en
local.year.published2015en
local.subject.for2020300305 Animal reproduction and breedingen
local.subject.seo2020100410 Pigsen
Appears in Collections:Animal Genetics and Breeding Unit (AGBU)
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