Show simple item record

dc.contributor.authorNewsome RFen
dc.contributor.authorGreen MJen
dc.contributor.authorBell NJen
dc.contributor.authorBollard NJen
dc.contributor.authorMason CSen
dc.contributor.authorWhay HRen
dc.contributor.authorHuxley JNen
dc.date.accessioned2017-06-23T09:06:39Z
dc.date.available2017-06-23T09:06:39Z
dc.date.issued2017
dc.identifier.citation100:6en
dc.identifier.issn0022-0302
dc.identifier.urihttps://doi.org/10.3168/jds.2016-12012
dc.identifier.urihttp://hdl.handle.net/11262/11255
dc.description.abstractClaw horn disruption lesions (CHDL) are a major cause of lameness in dairy cattle and are likely a result of excessive forces being applied to the germinal epithelium that produces the claw horn. The digital cushion is a connective tissue structure, containing depots of adipose tissue, that sits beneath the distal phalanx and has been shown to be thicker in fatter cows. Body condition score (BCS) loss is a risk factor for CHDL, and one possible explanation is that fat is mobilized from the digital cushion during negative energy balance, causing the digital cushion to thin and lose force-dissipating capacity, leading to disruption of claw horn growth. This prospective cohort study investigated the association between measures of body fat and sole soft tissue (SST) thickness (a combined measure of the corium and digital cushion beneath the distal phalanx) in a longitudinal manner. The SST of 179 cows in 2 high-yielding dairy herds were measured at 5 assessment points between 8 wk before and 35 wk postcalving. The BCS, back fat thickness (BFT), and lesion incidence were recorded. Data were analyzed in a 4-level mixed effects regression model, with the outcome being SST thickness beneath the flexor tuberosity of the distal phalanx. Data from 827 assessment points were available for analysis. The overall mean of SST was 4.99 mm (standard deviation: 0.95). The SST was thickest 8 wk before calving (5.22 mm, standard deviation: 0.91) and thinnest 1 wk postcalving (4.68 mm, standard deviation: 0.87), suggesting an effect of calving on SST. The BFT was positively correlated with SST in the model with a small effect size (a 10 mm decrease in BFT corresponded with a 0.13 mm decrease in SST), yet the nadir of BFT was 11.0 mm at 9 to 17 wk postcalving (when SST was ∼4.95 mm), rather than occurring with the nadir of SST immediately after calving. The SST also varied with other variables [e.g., cows that developed a sole ulcer or severe sole hemorrhage during the study had thinner SST (−0.24 mm)], except when a sole ulcer was present, when it was thicker (+0.53 mm). Cows that developed lesions had a thinner digital cushion before the lesion occurrence, which became thickened with sole ulcer presence, perhaps representing inflammation. Furthermore, although BFT was correlated with SST over time, SST may also have been influenced by other factors such as integrity of the suspensory apparatus, which could have a major effect on CHDL. Measures of body fat likely contributed to having thin SST, but other factors including calving, herd, and lesion presence also had an effect.en
dc.language.isoenen
dc.relation.isformatof14617en
dc.relation.ispartofJournal of Dairy Scienceen
dc.rightsCopyright © 2017, The Authors. Published by FASS and Elsevier Inc. on behalf of the American Dairy Science Association ®. This is an open access article under the CC BY-NC-ND license.
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/
dc.subjectDairy cowen
dc.subjectLamenessen
dc.subjectBody conditionen
dc.subjectDigital cushionen
dc.titleA prospective cohort study of digital cushion and corium thickness. Part 1: Associations with body condition, lesion incidence, and proximity to calvingen
dc.typeArticleen
dc.description.versionVersion of record
dc.extent.pageNumbers4745-4758en
rioxxterms.publicationdate2017-04-21
rioxxterms.typeJournal Article/Reviewen
dcterms.dateAccepted2017-02-19
refterms.accessExceptionNAen
refterms.dateDeposit2017-06-23
refterms.depositExceptionpublishedGoldOAen
refterms.panelUnspecifieden
refterms.technicalExceptionNAen
refterms.versionVoRen


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record

Copyright © 2017, The Authors. Published by FASS and Elsevier Inc. on behalf of the American Dairy Science Association ®.

This is an open access article under the CC BY-NC-ND license.
Except where otherwise noted, this item's license is described as Copyright © 2017, The Authors. Published by FASS and Elsevier Inc. on behalf of the American Dairy Science Association ®. This is an open access article under the CC BY-NC-ND license.