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In Experiment 1, cyclic Black Angus heifers (n\u2003=\u200320) received an Ovsynch protocol and were randomly assigned to receive (CIDR\u2010Ovsynch) or not (Ovsynch) a progesterone device between Days 0 and 7. Treatment with a controlled internal drug release (CIDR) device significantly increased the size of the dominant follicle prior to ovulation (12.8\u2003\u00b1\u20030.4 CIDR\u2010Ovsynch vs 11.4\u2003\u00b1\u20030.4 Ovsynch) (p\u2003&lt;\u20030.02). Plasma progesterone concentrations throughout the experiment were affected by the interaction between group and day effects (p\u2003&lt;\u20030.004). In Experiment 2, cyclic Polled Hereford heifers (n\u2003=\u2003382) were randomly assigned to one of the six treatment groups (3\u2003\u00d7\u20032 factorial design) to receive a CIDR, a used bovine intravaginal device (DIB), or a medroxiprogesterone acetate (MAP) sponge and GnRH analogues (lecirelin or buserelin). All heifers received oestradiol benzoate plus one of the devices on Day 0 and PGF on Day 7\u2003pm (device withdrawal). Heifers were detected in oestrus 36\u2003h after PGF and inseminated 8\u201312\u2003h later, while the remainder received GnRH 48\u2003h after PGF and were inseminated on Day 10 (60\u2003h). The number of heifers detected in oestrus on Day 8 and conception rate to AI on Day 9 were higher (p\u2003&lt;\u20030.01) in the used\u2010DIB than in the CIDR or MAP groups, while the opposite occurred with the pregnancy rate to FTAI on Day 10 (p\u2003&lt;\u20030.01). There was no effect of progesterone source, GnRH analogue or their interaction on overall pregnancy rates (64.9%). Progesterone treatment of heifers during an Ovsynch protocol resulted in a larger pre\u2010ovulatory follicle in beef heifers. Progesterone content of intravaginal devices in synchronization protocols is important for the timing of AI, as the use of low\u2010progesterone devices can shorten the interval to oestrus.<\/jats:p>","DOI":"10.1111\/j.1439-0531.2011.01833.x","type":"journal-article","created":{"date-parts":[[2011,9,1]],"date-time":"2011-09-01T03:10:35Z","timestamp":1314846635000},"page":"230-237","source":"Crossref","is-referenced-by-count":1,"title":["Intravaginal Progesterone Devices in Synchronization Protocols for Artificial Insemination in Beef Heifers"],"prefix":"10.1111","volume":"47","author":[{"given":"MF","family":"Martinez","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"G","family":"de 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