Main programTurnover of dominant follicles in cattle of different reproductive states
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Cited by (59)
Perfluorooctanoic acid (PFOA) inhibits steroidogenesis and mitochondrial function in bovine granulosa cells in vitro
2023, Environmental PollutionTemporal evaluation of follicular dynamics and endocrine patterns of Holstein (Bos taurus), Gir (Bos indicus), and Murrah (Bubalus bubalis) heifers kept under the same nutritional, management and environmental conditions
2022, TheriogenologyCitation Excerpt :Reports in Buffalo females [42] have shown patterns of 1 to 3-wave IOIs [5,43], similar to our study. These variability could be related to the impact that environment [15], genetic factors [7,9,20,40,44], parity status [40,45], metabolic level [10], and intraovarian factors [46] have on ovarian events. The present study was designed to account for some of those factors, by evaluating the three breeds simultaneously.
Presynchronization with CIDR, with or without GnRH, prior to CO-Synch in beef heifers
2020, TheriogenologyCitation Excerpt :In the current study, treatment, age of heifers and BCS influenced the preovulatory follicle size. It should be noted that preovulatory follicle size was influenced by-pubertal status of beef heifers (diameter of the dominant follicle in pre-pubertal heifers varied between 8 and 12 mm diameter) [39], effect of dietary intake in beef heifers (low dietary intake reduced the diameter and persistence of dominant follicles during the estrous cycle of beef heifers) [40], days of estrous cycle at first GnRH in beef cows [41,42], number of waves in a cycle in heifers (diameter on day before ovulation - 16.5 ± 0.4 and 13.9 ± 0.4 mm for heifers with 2 vs 3 waves, respectively), and increased LH during dominant follicle growth phase, expression of LH receptors on granulosa cells and low FSH mileu [43]. Appropriate progesterone concentrations are important to promote healthy follicular growth during the luteal phase [44–49].
Influence of small doses of gonadotropin-releasing hormone following controlled internal drug-release insert removal on reproductive parameters in beef cattle subjected to a fixed-time artificial insemination protocol
2018, Professional Animal ScientistCitation Excerpt :Cattle can exhibit estrus up to 5 d (120 h) following controlled internal drug-release insert (CIDR) removal (Stevenson et al., 2000; Busch et al., 2008; Wilson et al., 2010; Patterson et al., 2013); however, many fixed-time AI protocols recommend inseminating heifers and cows between 54 and 72 h following CIDR removal. Thus, variations in interval to estrus and overall expression of estrus have been hindrances to the successful implementation of fixed-time AI synchronization protocols (Roche and Boland, 1991; Bo et al., 1994). Gonadotropin-releasing hormone injections (GnRH; 100 μg, i.m.) administered during synchronization protocols can induce ovulation of small dominant follicles that have not produced sufficient concentrations of estradiol to induce estrus (Jinks et al., 2013; Perry et al., 2014).
Influence of GnRH supplementation at CIDR removal on estrus expression and interval to estrus in beef cattle
2018, TheriogenologyCitation Excerpt :Cows and heifers that exhibit estrus prior to fixed-time AI had increased concentrations of estradiol [1] and increased conception rates compared to animals that did not exhibit estrus [10]. Variations in expression of estrus, interval to estrus, and/or pregnancy success have been hindrances to the successful use of protocols to synchronize estrus [11,12]. As a result, investigation in ways to manipulate these protocols to favorably impact expression of estrus, interval to estrus, and/or conception rates presents an imperative area of research.