{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,28]],"date-time":"2025-12-28T02:17:05Z","timestamp":1766888225903},"reference-count":15,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2005,3,23]],"date-time":"2005-03-23T00:00:00Z","timestamp":1111536000000},"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":[[2005,4]]},"abstract":"<jats:title>Contents<\/jats:title><jats:p>The use of exogenous gonadotrophins in puberty inducement and ovulation synchronization is a technique that has a positive influence on the management of swine. The purpose of this study was to verify the effects of a second gonadotrophin treatment [equine chorionic gonadotrophin (eCG) and luteinizing hormone (LH), intramuscularly (i.m.)] upon the second oestrus synchronization and fertility in gilts. Seventy\u2010one NAIMA<jats:sup>\u00ae<\/jats:sup> (Pen Ar Lan) gilts had their first oestrus (puberty inducement) induced by a hormonal treatment (eCG and LH). Then, they were randomly distributed into two treatments, with (T1) and without (C) gonadotrophin treatment at the second oestrus. The animals were fed with a single ration (16% of crude protein and 3286.73\u2003kcal ME\/kg), and timed artificial insemination performed at the second oestrus. Gilts were slaughtered for embryo recovery and ovary examination about 5\u2003days after insemination. There was no evidence of a difference in the percentage of the second oestrus expression (T1 \u2013 90.90% and C \u2013 86.84%), the duration of the oestrus cycle (T1 \u2013 19.62\u2003\u00b1\u20030.82\u2003days and C \u2013 19.67\u2003\u00b1\u20034.14\u2003days), the percentage of follicular cysts (T1 \u2013 15.15% and C \u2013 18.42%) and number of ovulations (T1 \u2013 14.60\u2003\u00b1\u20035.7 and C \u2013 13.23\u2003\u00b1\u20034.8) between treatments (p\u2003&gt;\u20030.05). However, the hormonal treatment (T1) showed minor oestrus dispersion and embryo viability (T1 \u2013 8.4\u2003\u00b1\u20035.6 and C \u2013 11.2\u2003\u00b1\u20034.6) (p\u2003&lt;\u20030.05). These results indicate that the better synchronization and expression of the second oestrus when using gonadotrophins (eCG and LH) is followed by a lower embryo viability, which is probably the consequence of the heterogeneous follicle recruitment during the injection of eCG.<\/jats:p>","DOI":"10.1111\/j.1439-0531.2005.00569.x","type":"journal-article","created":{"date-parts":[[2005,3,23]],"date-time":"2005-03-23T16:41:52Z","timestamp":1111596112000},"page":"141-144","source":"Crossref","is-referenced-by-count":14,"title":["Second Oestrus Synchronization and Precocious Embryo Viability after Puberty Induction in Gilts by the Use of Gonadotrophin Treatment"],"prefix":"10.1111","volume":"40","author":[{"given":"V","family":"Do 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