{"id":"https://openalex.org/W2470257575","doi":"https://doi.org/10.2527/1994.7271796x","title":"Influence of corpus luteum and induced ovulation on ovarian follicular dynamics in postpartum cyclic cows treated with buserelin and cloprostenol1","display_name":"Influence of corpus luteum and induced ovulation on ovarian follicular dynamics in postpartum cyclic cows treated with buserelin and cloprostenol1","publication_year":1994,"publication_date":"1994-07-01","ids":{"openalex":"https://openalex.org/W2470257575","doi":"https://doi.org/10.2527/1994.7271796x","mag":"2470257575","pmid":"https://pubmed.ncbi.nlm.nih.gov/7928759"},"language":"en","primary_location":{"id":"doi:10.2527/1994.7271796x","doi":"https://doi.org/10.2527/1994.7271796x","is_oa":false,"landing_page_url":"https://doi.org/10.2527/1994.7271796x","pdf_url":null,"source":{"id":"https://openalex.org/S72684844","display_name":"Journal of Animal Science","issn_l":"0021-8812","issn":["0021-8812","1525-3015","1525-3163","1544-7847"],"is_oa":false,"is_in_doaj":false,"is_core":true,"listed_in":["anvur-scientific","cwts-core","dongbi-a","jufo-2","ki-jl-2","medline","norway-2","poland-70","russia-white-list-1","vabb-shw"],"host_organization":"https://openalex.org/P4310311648","host_organization_name":"Oxford University Press","host_organization_lineage":["https://openalex.org/P4310311648","https://openalex.org/P4310311647"],"host_organization_lineage_names":["Oxford University Press","University of Oxford"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"Journal of Animal Science","raw_type":"journal-article"},"volume":null,"type":"article","is_traditional":true,"indexed_in":["crossref","pubmed"],"open_access":{"is_oa":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5030199701","display_name":"H. 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Three groups were formed: CL\u2212OV+ (n =8), CL+OV+ (n = 6), and CL+OV\u2212 (n = 4). Buserelin induced an ovulation in all CL\u2212 cows (progesterone [P 4 ] <.3 ng/ mL) and in CL+ cows that had P 4 < 4 ng/mL but did not in CL+ cows that had P 4 > 8 ng/mL. Within CL+ cows, buserelin-induced ovulation (OV+) was associated with a smaller ( P <.0001) increase in F1 and Fl \u2013 F2 diameters and a transient increase in the number of medium follicles that was greater ( P <.03) and of a longer duration ( P <.01) than in OV\u2212 cows. After PGF, the increase in F1 and F1 \u2013 F2 diameters was still greater in OV+ than in OV\u2212 cows (day \u00d7 OV; P <.05). In all cows, the selection of the preovulatory follicle occurred before PGF injection. Results indicate that a buserelin-induced ovulation was dependent on P 4 concentrations at the time of treatment. Subsequently, ovarian follicular dynamics were altered by a GnRH-induced ovulation, but emergence and selection of a large growing follicle occurred in all cows within 6 d of treatment. This follicle became the preovulatory follicle following PGF-induced luteolysis","P <.05). In all cows, the selection of the preovulatory follicle occurred before PGF injection. Results indicate that a buserelin-induced ovulation was dependent on P4 concentrations at the time of treatment. Subsequently, ovarian follicular dynamics were altered by a GnRH-induced ovulation, but emergence and selection of a large growing follicle occurred in all cows within 6 d of treatment. This follicle became the preovulatory follicle following PGF-induced luteolysis","\u2021The influence of the corpus luteum (CL) at the time of buserelin treatment and of buserelin-induced ovulation on the dynamics of ovarian follicular development was determined in 18 postpartum cyclic beef cows injected i.m. with 8 \u03bcg of buserelin on d 0 (d of treatment) and with 500 \u03bcg of cloprostenol (PGF) 6 d later. From d 0 to onset of estrus, ovaries were examined ultrasonographically, and blood samples were collected daily. Number of medium (5 to 10 mm) follicles and diameters of the two largest (F1 and F2) follicles in each cow were recorded. Cows were grouped according to the presence (CL+) or absence (CL\u2212) of an active CL before buserelin injection and the presence (OV+) or absence (OV\u2212) of a buserelin-induced ovulation (OV). Three groups were formed: CL\u2212OV+ (n =8), CL+OV+ (n = 6), and CL+OV\u2212 (n = 4). Buserelin induced an ovulation in all CL\u2212 cows (progesterone [P4]  8 ng/mL. Within CL+ cows, buserelin-induced ovulation (OV+) was associated with a smaller (P <.0001) increase in F1 and Fl \u2013 F2 diameters and a transient increase in the number of medium follicles that was greater (P <.03) and of a longer duration (P <.01) than in OV\u2212 cows. After PGF, the increase in F1 and F1 \u2013 F2 diameters was still greater in OV+ than in OV\u2212 cows (day \u00d7 OV"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"\u2021 The influence of the corpus luteum (CL) at the time of buserelin treatment and of buserelin-induced ovulation on the dynamics of ovarian follicular development was determined in 18 postpartum cyclic beef cows injected i.m. with 8 \u03bc g of buserelin on d 0 (d of treatment) and with 500 \u03bc g of cloprostenol (PGF) 6 d later. From d 0 to onset of estrus, ovaries were examined ultrasonographically, and blood samples were collected daily. Number of medium (5 to 10 mm) follicles and diameters of the two largest (F1 and F2) follicles in each cow were recorded. Cows were grouped according to the presence (CL+) or absence (CL\u2212) of an active CL before buserelin injection and the presence (OV+) or absence (OV\u2212) of a buserelin-induced ovulation (OV). Three groups were formed: CL\u2212OV+ (n =8), CL+OV+ (n = 6), and CL+OV\u2212 (n = 4). Buserelin induced an ovulation in all CL\u2212 cows (progesterone [P 4 ] <.3 ng/ mL) and in CL+ cows that had P 4 < 4 ng/mL but did not in CL+ cows that had P 4 > 8 ng/mL. Within CL+ cows, buserelin-induced ovulation (OV+) was associated with a smaller ( P <.0001) increase in F1 and Fl \u2013 F2 diameters and a transient increase in the number of medium follicles that was greater ( P <.03) and of a longer duration ( P <.01) than in OV\u2212 cows. After PGF, the increase in F1 and F1 \u2013 F2 diameters was still greater in OV+ than in OV\u2212 cows (day \u00d7 OV; P <.05). In all cows, the selection of the preovulatory follicle occurred before PGF injection. Results indicate that a buserelin-induced ovulation was dependent on P 4 concentrations at the time of treatment. Subsequently, ovarian follicular dynamics were altered by a GnRH-induced ovulation, but emergence and selection of a large growing follicle occurred in all cows within 6 d of treatment. This follicle became the preovulatory follicle following PGF-induced luteolysis","institution_ids":[]},{"raw_affiliation_string":"P <.05). In all cows, the selection of the preovulatory follicle occurred before PGF injection. Results indicate that a buserelin-induced ovulation was dependent on P4 concentrations at the time of treatment. Subsequently, ovarian follicular dynamics were altered by a GnRH-induced ovulation, but emergence and selection of a large growing follicle occurred in all cows within 6 d of treatment. This follicle became the preovulatory follicle following PGF-induced luteolysis","institution_ids":[]},{"raw_affiliation_string":"\u2021The influence of the corpus luteum (CL) at the time of buserelin treatment and of buserelin-induced ovulation on the dynamics of ovarian follicular development was determined in 18 postpartum cyclic beef cows injected i.m. with 8 \u03bcg of buserelin on d 0 (d of treatment) and with 500 \u03bcg of cloprostenol (PGF) 6 d later. From d 0 to onset of estrus, ovaries were examined ultrasonographically, and blood samples were collected daily. Number of medium (5 to 10 mm) follicles and diameters of the two largest (F1 and F2) follicles in each cow were recorded. Cows were grouped according to the presence (CL+) or absence (CL\u2212) of an active CL before buserelin injection and the presence (OV+) or absence (OV\u2212) of a buserelin-induced ovulation (OV). Three groups were formed: CL\u2212OV+ (n =8), CL+OV+ (n = 6), and CL+OV\u2212 (n = 4). Buserelin induced an ovulation in all CL\u2212 cows (progesterone [P4]  8 ng/mL. Within CL+ cows, buserelin-induced ovulation (OV+) was associated with a smaller (P <.0001) increase in F1 and Fl \u2013 F2 diameters and a transient increase in the number of medium follicles that was greater (P <.03) and of a longer duration (P <.01) than in OV\u2212 cows. 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