{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2023,10,11]],"date-time":"2023-10-11T05:18:17Z","timestamp":1697001497208},"reference-count":39,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2007,4,16]],"date-time":"2007-04-16T00:00:00Z","timestamp":1176681600000},"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":[[2007,8]]},"abstract":"<jats:title>Contents<\/jats:title><jats:p>The aim of the study was to compare how different feeding levels affect the ovarian potential of follicular development and oocyte maturation in response to superovulatory treatment in native Mangalica (M, n\u2003=\u200317) compared with Landrace (L, n\u2003=\u200320) pigs. Gilts of both breeds were fed high\u2010energy (HI\u20132.5\u2003kg) or low\u2010energy (LO \u2013 1.25\u2003kg) feed during oestrus synchronization (15\u2003days of Regumate\u00ae feeding) till the time of oocyte aspiration (Day 6 after Regumate\u00ae). Follicular growth was stimulated by the administration of 1000\u2003IU equiue choriou gonadotropiu (eCG) 24\u2003h after Regumate\u00ae treatment, and ovulation was induced by injection of 750\u2003IU human choriou gonadotropiu (hCG) 80\u2003h after eCG adminstration. Ultrasound (US) investigation was done three times (4\u201310\u2003h before, and 40\u201344 and 72\u201374\u2003h after eCG administration) for the observation of follicular development. Oocyte and follicular fluid (FF) were collected endoscopically 34\u2003h after hCG injection. Cumulus\u2013oocyte complexes were evaluated, their morphology determined, and thereafter fixed and stained for chromatin evaluation. Oocytes were classified as meiosis\u2010resumed (germinal vesicle breakdown, diakinesis, metaphase I to anaphase I) or matured (telophase I and metaphase II). FF concentrations of oestradiol and progesterone were measured by validated radioimmunoassays. In L gilts, differences were observed between HI and LO in the number of preovulatory follicles (32.3\u2003\u00b1\u200310.5 vs 17.1\u2003\u00b1\u200312.3, p\u2003&lt;\u20030.05), but not in M (25.3\u2003\u00b1\u20032.9 vs 28.8\u2003\u00b1\u20037.3, p\u2003&gt;\u20030.05). Initial follicular growth was not affected by feeding levels; however, preovulatory follicle size was larger in M (7.1\u2003\u00b1\u20030.9 and 6.9\u2003\u00b1\u20031.1\u2003mm vs 5.7\u2003\u00b1\u20030.7 and 5.5\u2003\u00b1\u20030.8\u2003mm; p\u2003&lt;\u20030.05). No differences were obtained with relation to mature chromatin configuration in both breeds (L gilts: HI \u2013 70% and LO\u201367% vs M gilts: HI \u2013 67% and LO \u2013 63%). A twofold higher oestradiol concentration was detected in FF of HI\u2010M and LO\u2010M (29.6\u2003\u00b1\u20036.8 and 30.9\u2003\u00b1\u200310.3\u2003ng\/ml respectively) compared with that of L (16.9\u2003\u00b1\u20039.7 and 17.9\u2003\u00b1\u20033.6\u2003ng\/ml, respectively; p\u2003&lt;\u20030.05). The mean FF progesterone level was nearly fivefold higher in M (2020.4\u2003\u00b1\u20031056 and 1512.2\u2003\u00b1\u20031121.8\u2003ng\/ml) compared with L (386.2\u2003\u00b1\u2003113.7 and 298.8\u2003\u00b1\u2003125.9\u2003ng\/ml, p\u2003&lt;\u20030.05). The results indicate an influence of the feeding of altered energy on the number of recruitable preovulatory follicles in modern Landrace but not in native Mangalica breed. Moreover, the follicular steroid hormone milieu differs between Landrace and Mangalica gilts but not depending on feeding levels. Oocyte maturation was not affected by diet.<\/jats:p>","DOI":"10.1111\/j.1439-0531.2006.00790.x","type":"journal-article","created":{"date-parts":[[2007,5,2]],"date-time":"2007-05-02T15:43:24Z","timestamp":1178120604000},"page":"441-444","source":"Crossref","is-referenced-by-count":9,"title":["Superovulatory Ovarian Response in Mangalica Gilts is Not Influenced by Feeding 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