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• W2623374211 abstract "This research aimed to compare the morphological and functional changes of the corpus luteum (CL) of cows treated with eCG before or after ovulation. Eighteen adult and dry Holstein cows were used. At random day of the estrous cycle (D-10) 2 intravaginal P4 (1.9 g) device (iP4, CIDR®, Zoetis, Sao Paulo, SP, Brazil) and intramuscular (im) 2 mg estradiol benzoate (EB, Gonadiol®) were used. Seven days after, on D-3, it was administered 25 mg of PGF2α (Lutalyse®). At this moment, the animals were divided into 3 groups: 6 cows that received no treatment (Control group); 6 cows received 400IU eCG (Novormon®) i.m. (D-3, pre-eCG group); or 6 cows who received 400IU eCG i.m. 3 days after estrus (D+3, post-eCG group). On D-2, the iP4 were removed and animals received 1.0 mg of estradiol cypionate i.m. (EC, E.C.P.®). The day of estrus was considered D0. Daily ultrasound (trans-rectal linear transducer of 7.5 MHz, Mindray DP 2200 vet, Mindray, China) was done between D-3 and D0 to measure the diameter of the dominant follicle (ODF) and between D+3 and D+26 to measure CL volume. The serum concentration of P4 was determined between D+3 and D+17 and the complete luteolysis was considered when P4 <0.10 ng/mL. The research was performed in three experimental periods when each animal was submitted to all treatments (n = 54). However, only single ovulation animals were kept in the study (n = 25). The results were expressed as mean ± SEM and data was analyzed using GLIMMIX (general data) and MIXED (repeated measures) procedures of SAS 9.3 software. The significance level was 5%. The results of groups Control (n = 8), pre-eCG (n = 6) and post-eCG (n = 11) were, respectively: ODF between D-3 and D0 - 10.79 ± 0.36, 10.57 ± 0.61 and 11.16 ± 0.33 mm (P treat = 0.83, P time <0.01, P treat*time = 0.55); CL volume between D+3 and D+17 – 5,926.0 ± 226.0, 5,968.4 ± 287.7 and 6,561.8 ± 229.6 mm3 (P treat = 0.52, P time <0.01, P treat*time = 0.04), with lower CL to preeCG on D+9 and lower CL to Control on D+13; serum P4 - 1.89 ± 0.12, 2.21 ± 0.15 and 2.27 ± 0.12 ng/mL (P treat = 0.40, P time < 0.01, P treat * time = 0.96), with lower P4 to Control group on D+14; luteolysis rate until D+26 - 87.5 (7/8), 83.3 (5/6) and 81.8% (9/11) (P = 0.84); interval ovulation-luteolysis - 21.1 ± 0.8, 20.8 ± 0.5 and 19.3 ± 0.6 days (P = 0.16); and interval between two ovulations - 22.8 ± 1.0, 22.8 ± 0.5 and 22.0 ± 0.5 (P = 0.68). Despite the similarity in the interval ovulation-luteolysis, it was observed that luteolysis at D+20 considering the respective treatments was 12.5 (1/8), 0.0 (0/6) and 54.5% (6/11). It was concluded that treatment with 400IU eCG after ovulation increases the volume of CL, and the same treatment, before or after ovulation, is able to increase the circulating P4 on day 14 after estrus. However, the effect of treatments on the longevity of the CL needs to be better clarified. Acknowledgements: FAPESP (2014/00739-9 and 2015/02551-0)." @default.
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• W2623374211 date "2016-03-01" @default.
• W2623374211 modified "2023-09-23" @default.
• W2623374211 title "Morphological and functional development of the corpus luteum of Holstein cows treated with ECG before or after ovulation" @default.
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