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dc.contributor.authorMaicas, C.
dc.contributor.authorHutchinson, Ian A.
dc.contributor.authorKenneally, Jonathon
dc.contributor.authorGrant, Jim
dc.contributor.authorCromie, A. R.
dc.contributor.authorLonergan, P.
dc.contributor.authorButler, Stephen T.
dc.date.accessioned2020-07-14T11:39:11Z
dc.date.available2020-07-14T11:39:11Z
dc.date.issued2019-08-22
dc.identifier.citationMaicas, C., Hutchinson, I., Kenneally, J., Grant, J., Cromie, A., Lonergan, P. and Butler, S. Fertility of fresh and frozen sex-sorted semen in dairy cows and heifers in seasonal-calving pasture-based herds. Journal of Dairy Science. 2019, 102 (11), 10530-10542, doi: https://dx.doi.org/10.3168/jds.2019-16740en_US
dc.identifier.urihttp://hdl.handle.net/11019/2166
dc.descriptionpeer-revieweden_US
dc.description.abstractOur objective in this study was to evaluate the reproductive performance of dairy heifers and cows inseminated with fresh or frozen sex-sorted semen (SS) in seasonal-calving pasture-based dairy herds. Ejaculates of 10 Holstein-Friesian bulls were split and processed to provide (1) fresh conventional semen at 3 × 106 sperm per straw (CONV); (2) fresh SS at 1 × 106 sperm per straw (SS-1M); (3) fresh SS semen at 2 × 106 sperm per straw (SS-2M); and (4) frozen SS at 2 × 106 sperm per straw (SS-FRZ). Generalized linear mixed models were used to evaluate the effect of semen treatment and other explanatory variables on pregnancy per artificial insemination (P/AI) in heifers (n = 3,214) and lactating cows (n = 5,457). In heifers, P/AI was greater for inseminations with CONV (60.9%) than with SS-FRZ (52.8%) but did not differ from SS-1M (54.2%) or SS-2M (53.5%). Cows inseminated with CONV had greater P/AI (48.0%) than cows inseminated with SS, irrespective of treatment (SS-1M, SS-2M, and S-FROZEN; 37.6, 38.9, and 40.6%, respectively). None of the SS treatments differed from each other with regard to P/AI in either heifers or cows. The relative performance of SS compared with CONV was also examined [i.e., relative P/AI = (SS P/AI)/(CONV P/AI) × 100]. Frozen SS achieved relative P/AI >84%. Bull affected P/AI in both heifers and cows, but no bull by semen treatment interaction was observed. In heifers, P/AI increased with increasing Predicted Transmitting Ability for milk protein percentage. In cows, P/AI increased with increasing Economic Breeding Index (EBI) and with days in milk (DIM) at AI but decreased with increasing EBI milk subindex, parity and with DIM2. Cows in parity ≥5 had the lowest P/AI and differed from cows in parities 1, 2, or 3. Dispatch-to-AI interval of fresh semen did not affect P/AI in lactating cows, but a dispatch-to-AI interval by bull interaction was detected whereby P/AI was constant for most bulls but increased with greater dispatch-to-AI intervals for 2 bulls. In conclusion, frozen SS achieved greater P/AI relative to conventional semen than was previously reported in lactating cows. Fresh SS did not achieve greater P/AI than frozen SS, regardless of whether the sperm dose per straw was 1 × 106 or 2 × 106. A bull effect for all semen treatments, as well as a dispatch-to-AI interval by bull interaction for fresh semen, highlights the importance of using a large team of bulls for breeding management.en_US
dc.language.isoenen_US
dc.publisherElsevieren_US
dc.relation.ispartofseriesJournal of Dairy Science;
dc.rightsAttribution-NonCommercial-ShareAlike 3.0 United States*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-sa/3.0/us/*
dc.subjectsexed semenen_US
dc.subjectpasture-based systemen_US
dc.subjectdairyen_US
dc.subjectfertilityen_US
dc.titleFertility of fresh and frozen sex-sorted semen in dairy cows and heifers in seasonal-calving pasture-based herdsen_US
dc.typeArticleen_US
dc.embargo.terms2020-08-22en_US
dc.identifier.doihttps://dx.doi.org/10.3168/jds.2019-16740
dc.contributor.sponsorTeagasc Walsh Fellowship programmeen_US
dc.contributor.sponsorTeagasc postdoctoral fellowshipen_US
dc.contributor.sponsorDovea Geneticsen_US
dc.contributor.sponsorMunster AIen_US
dc.contributor.sponsorProgressive Geneticsen_US
dc.contributor.sponsorNational Cattle Breeding Centreen_US
dc.contributor.sponsorABP Food Groupen_US
dc.contributor.sponsorDawn Meatsen_US
dc.contributor.sponsorKepaken_US
dc.contributor.sponsorSlaney Linden Foodsen_US
dc.contributor.sponsorIrish Farmers Journalen_US
dc.contributor.sponsorIrish Cattle Breeding Federationen_US
dc.contributor.sponsorTeagascen_US


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