{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,24]],"date-time":"2026-09-24T03:39:55Z","timestamp":1790221195160,"version":"4.1.0"},"reference-count":36,"publisher":"Akademiai Kiado Zrt.","issue":"1","license":[{"start":{"date-parts":[[2019,3,1]],"date-time":"2019-03-01T00:00:00Z","timestamp":1551398400000},"content-version":"unspecified","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["akjournals.com"],"crossmark-restriction":true},"short-container-title":["Acta Veterinaria Hungarica"],"published-print":{"date-parts":[[2019,3]]},"abstract":"<jats:p>The aim of this study was to examine the effect of twin pregnancy, fetal laterality, the number of corpora lutea (CL) and cavitary CL on pregnancy losses in Holstein-Friesian cows with a positive pregnancy diagnosis based on ultrasonography between days 29\u201342 after AI. Pregnancy was confirmed by transrectal palpation between days 57\u201370 after AI and at the time of drying-off as well. Twin pregnancy rate was 8.4% at the time of the early pregnancy examination. Pregnancy loss did not differ between singleton- and twin-carrying animals either between days 57\u201370 of gestation or at drying-off. More losses occurred in singletons between days 29\u201342 and 57\u201370 in cows with cavitary than in cows with noncavitary CL (12.1% vs. 3.6%; P &lt; 0.05) and in cows with double CL than in cows with single CL (7.3% vs. 3.6% %; P &lt; 0.05). Between days 57\u201370 of gestation and drying-off this difference was still significant (20.7% vs. 3.7%; P &lt; 0.001), while it was non-significant between cows with one CL (5.7%) vs. double CL (3.7%). Cavity occurrence was not affected by hormone therapy prior to AI (either PGF2\u03b1 or OvSynch; 4.4% vs. 5.4%, respectively); however, the number of CL was reduced by the treatments (11.6 vs. 19.6%; P &lt; 0.0005). In twin pregnancies there was no difference in the pregnancy losses between bilateral and unilateral pregnancies at any time point. The length of gestation was 278.2 \u00b1 10.5 (singleton) and 267.4 \u00b1 31.2 (twin) days, respectively (P &lt; 0.01). The stillbirth ratio was higher in twin carriers than in singleton carriers (19.5% vs. 5.3%; P &lt; 0.001).<\/jats:p>","DOI":"10.1556\/004.2019.013","type":"journal-article","created":{"date-parts":[[2019,3,29]],"date-time":"2019-03-29T06:42:47Z","timestamp":1553841767000},"page":"115-126","update-policy":"https:\/\/doi.org\/10.1556\/policypage.crossmark.crossref.1","source":"Crossref","is-referenced-by-count":15,"title":["Pregnancy and stillbirth losses in dairy cows with singleton and twin pregnancies"],"prefix":"10.1556","volume":"67","author":[{"given":"Zolt\u00e1n","family":"Szel\u00e9nyi","sequence":"first","affiliation":[{"name":"1 Department and Clinic for Production Animals, University of Veterinary Medicine Budapest, H-2225 \u00dcll\u0151-D\u00f3ra major, Hungary"},{"name":"2 MTA-SZIE Large Animal Clinical Research Group, \u00dcll\u0151-D\u00f3ra major, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dorottya","family":"Gy\u0151ri","sequence":"additional","affiliation":[{"name":"2 MTA-SZIE Large Animal Clinical Research Group, \u00dcll\u0151-D\u00f3ra major, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Szabolcs","family":"Boldizs\u00e1r","sequence":"additional","affiliation":[{"name":"2 MTA-SZIE Large Animal Clinical Research Group, \u00dcll\u0151-D\u00f3ra major, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Levente","family":"Kov\u00e1cs","sequence":"additional","affiliation":[{"name":"2 MTA-SZIE Large Animal Clinical Research Group, \u00dcll\u0151-D\u00f3ra major, Hungary"},{"name":"3 Institute of Animal Science, Faculty of Agricultural and Environmental Science, Szent Istv\u00e1n University, G\u00f6d\u00f6ll\u0151, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Attila","family":"R\u00e9p\u00e1si","sequence":"additional","affiliation":[{"name":"2 MTA-SZIE Large Animal Clinical Research Group, \u00dcll\u0151-D\u00f3ra major, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"L\u00e1szl\u00f3","family":"Moln\u00e1r","sequence":"additional","affiliation":[{"name":"2 MTA-SZIE Large Animal Clinical Research Group, \u00dcll\u0151-D\u00f3ra major, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ott\u00f3","family":"Szenci","sequence":"additional","affiliation":[{"name":"1 Department and Clinic for Production Animals, University of Veterinary Medicine Budapest, H-2225 \u00dcll\u0151-D\u00f3ra major, Hungary"},{"name":"2 MTA-SZIE Large Animal Clinical Research Group, \u00dcll\u0151-D\u00f3ra major, Hungary"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"425","reference":[{"key":"rf1","doi-asserted-by":"publisher","DOI":"10.1016\/j.theriogenology.2012.07.027"},{"key":"rf2","first-page":"167","volume":"65","author":"Ball P. 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