{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,16]],"date-time":"2026-10-16T01:12:45Z","timestamp":1792113165575,"version":"4.4.0"},"reference-count":20,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2014,8,11]],"date-time":"2014-08-11T00:00:00Z","timestamp":1407715200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Reprod Domestic Animals"],"published-print":{"date-parts":[[2014,10]]},"abstract":"Contents<\/jats:title>The aim of this study was to evaluate the effect of porcine luteinizing hormone (pLH<\/jats:styled-content>) given at oestrous onset in gilts, by different routes and doses, on the interval between onset of oestrus and ovulation (IOEO<\/jats:styled-content>) and reproductive performance using a single fixed\u2010time artificial insemination (FTAI<\/jats:styled-content>). A total of 153 gilts were submitted to oestrous detection at 8\u2010h intervals and assigned to three groups: control \u2013 without hormone application and inseminated at 0, 24 and 48\u00a0h after oestrous onset;VS<\/jats:styled-content>2.5FTAI<\/jats:styled-content>\u2013 2.5\u00a0mgpLH<\/jats:styled-content>by the vulvar submucosal route at oestrous onset and a singleFTAI<\/jats:styled-content>16\u00a0h later;IM<\/jats:styled-content>5FTAI<\/jats:styled-content>\u2013 5\u00a0mgpLH<\/jats:styled-content>by the intramuscular route at oestrous onset and a singleFTAI<\/jats:styled-content>16\u00a0h later. MoreVS<\/jats:styled-content>2.5FTAI<\/jats:styled-content>gilts (47.1%; p\u00a0<\u00a00.05) ovulated within 24\u00a0h after oestrous onset than control gilts (25.5%) whereasIM<\/jats:styled-content>5FTAI<\/jats:styled-content>gilts had an intermediate percentage (31.4%; p\u00a0>\u00a00.05). TheIOEO<\/jats:styled-content>tended to be shorter (p\u00a0=\u00a00.06) inVS<\/jats:styled-content>2.5FTAI<\/jats:styled-content>(30.2\u00a0\u00b1\u00a01.4\u00a0h) than in control (34.7\u00a0\u00b1\u00a01.4\u00a0h) gilts, but there was no difference (p\u00a0>\u00a00.05) between control andIM<\/jats:styled-content>5FTAI<\/jats:styled-content>(32.8\u00a0\u00b1\u00a01.4\u00a0h) gilts. Farrowing rate was not different (p\u00a0>\u00a00.05) among treatments. Total born piglets (TB<\/jats:styled-content>) was lower (p\u00a0<\u00a00.05) inVS<\/jats:styled-content>2.5FTAI<\/jats:styled-content>(12.3\u00a0\u00b1\u00a00.4) than in control gilts (14.1\u00a0\u00b1\u00a00.4), whereas intermediateTB<\/jats:styled-content>was observed inIM<\/jats:styled-content>5FTAI<\/jats:styled-content>gilts (13.3\u00a0\u00b1\u00a00.4). Due to the advancement of ovulation, reduction of the hormonal dose and the ease of application, the vulvar submucosal route would be the best option forFTAI<\/jats:styled-content>protocols, but their negative impact on litter size remains to be elucidated. Taking into account the good fertility results obtained in IM5FTAI gilts whose ovulation was not advanced, the possibility of a singleFTAI<\/jats:styled-content>without any hormonal treatment should be further investigated, to establish reliableFTAI<\/jats:styled-content>protocols for gilts.<\/jats:p>","DOI":"10.1111\/rda.12362","type":"journal-article","created":{"date-parts":[[2014,8,11]],"date-time":"2014-08-11T10:39:40Z","timestamp":1407753580000},"page":"756-760","source":"Crossref","is-referenced-by-count":13,"title":["Use of Porcine Luteinizing Hormone at Oestrous Onset in a Protocol for Fixed\u2010Time Artificial Insemination in Gilts"],"prefix":"10.1111","volume":"49","author":[{"given":"RR","family":"Ulguim","sequence":"first","affiliation":[{"name":"Setor de Su\u00ednos Faculdade de Veterin\u00e1ria Universidade Federal do Rio Grande do Sul \u2013 UFRGS Porto Alegre 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