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Influence of bull age, ejaculate number, and season of collection on semen production and sperm motility parameters in Holstein Friesian bulls in a commercial artificial insemination centre

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dc.contributor.author Murphy, Edel M.
dc.contributor.author Kelly, Alan K.
dc.contributor.author O'Meara, Ciara
dc.contributor.author Eivers, Bernard
dc.contributor.author Lonergan, Patrick
dc.contributor.author Fair, Seán
dc.date.accessioned 2019-01-21T09:54:48Z
dc.date.issued 2018
dc.identifier.uri http://hdl.handle.net/10344/7501
dc.description peer-reviewed en_US
dc.description.abstract In the current era of genomic selection, there is an increased demand to collect semen from genomically selected sires at a young age. The objective of this study was to assess the effect of bull age, ejaculate number, and season of collection on semen production (ejaculate volume, sperm concentration, and total sperm number; TSN) and sperm motility (prefreeze and post-thaw total and gross motility) parameters in Holstein Friesian bulls in a commercial artificial insemination (AI) center. The study involved the interrogation of a large dataset collected over a 4-yr period, (n = 8,983 ejaculates; n = 176 Holstein Friesian bulls aged between 9 mo and 8 yr). Bulls aged less than 1 yr had the poorest semen production and sperm motility values for all parameters assessed compared with bulls older than 1 yr (P < 0.01). First ejaculates had greater semen production and greater prefreeze motility values than second consecutive ejaculates (P < 0.01), but despite this, there was no difference in post-thaw motility. When subsequent ejaculates were collected from bulls aged less than 1 yr, semen production and sperm motility did not differ compared with mature bulls. Semen collected in winter was poorest in terms of sperm concentration and TSN, but best in terms of post-thaw motility (P < 0.01). In conclusion, second ejaculates can be collected, particularly from bulls aged less than 1 yr, without a significant decrease in post-thaw sperm motility, thus may be a useful strategy to increase semen availability from young genomically selected AI bulls in high demand. en_US
dc.language.iso eng en_US
dc.publisher Oxford University Press en_US
dc.relation.ispartofseries Journal of Animal Science;96 (6), pp. 2408-2418
dc.relation.uri http://dx.doi.org/10.1093/jas/sky130
dc.rights This is a pre-copyedited, author-produced PDF of an article accepted for publication in Journal of Animal Science, 96 (6), pp. 2408-2418 following peer review. The version of record is available online at:http://dx.doi.org/10.1093/jas/sky130 en_US
dc.subject genomic selection en_US
dc.subject bull en_US
dc.subject sperm en_US
dc.title Influence of bull age, ejaculate number, and season of collection on semen production and sperm motility parameters in Holstein Friesian bulls in a commercial artificial insemination centre en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.identifier.doi 10.1093/jas/sky130
dc.contributor.sponsor IRC en_US
dc.contributor.sponsor Department of Agriculture, Food and the Marine en_US
dc.contributor.sponsor Teagasc en_US
dc.relation.projectid EBPPG/2014/60 en_US
dc.date.embargoEndDate 2019-06-04
dc.embargo.terms 2019-06-04 en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US
dc.internal.rssid 2868530


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