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• W2626951074 abstract "Two experiments were performed aiming to evaluate the reproductive efficiency of dairy cows undergoing resynchronization after TAI (Exp 1) and the effect of resynchronization on the corpus luteum (CL) blood flow (Exp 2). The Exp 1, enrolled 601 cows distributed into 3 groups, EB (n=200), GnRH (n=197) and EB+GnRH (n=204). Following previous TAI all females were resynchronized with the insertion of a P4 device (Primer®, Tecnopec) on Day 25 (EB and EB+GnRH groups) or on Day 26 (GnRH Group). Concomitantly with the P4 device insert, females of EB group received 2mg of EB (RIC-BE®, Tecnopec), GnRH group, 25µg of lecirelin (Gestran®, Tecnopec, Brazil) and group EB+GnRH, 2mg of EB and 25µg of lecirelin. On Day 33 all devices of P4 were removed and females of both experimental groups underwent an ultrasonography exam in order to assess pregnancy diagnosis from the 1a TAI. All animals classified as non-pregnant received 0.282 mg of sodium cloprostenol (Estron®, Tecnopec) on Day 33, 1mg of EB on Day 34 and TAI on Day 35 AM. The pregnancy diagnosis reconfirmation of the 1st TAI and pregnancy diagnosis of the resynchronization was performed on Day 65. Statistical analysis was performed using the GLIMMIX procedure of SAS®. The experimental groups had similar pregnancy rate following 1st TAI, both at 33 [BE: 33.0, GnRH: 35.0 and BE+GnRH: 34.3%; P = 0.61] and 65 days [BE: 26.0, GnRH: 28.9 and BE + GnRH: 26.5%; P = 0.26]. Additionally, similar pregnancy loss was also observed between 33 and 65 days of pregnancy after 1st TAI [BE: 21.2, GnRH: 17.4 and BE+GnRH: 22.9%; P = 0.47]. Finally, the pregnancy rate 30 days after TAI related to the resynchronization was also similar between groups [BE: 20.9, GnRH: 17.2 and BE+GnRH: 25.4 %; P=0.54]. For all analyzed variables it was observed farm effect (P 0.05). In Exp 2, 42 lactating cows used in the previous experiment [EB: n=15; GnRH: n=12; EB+GnRH: n=15] were evaluated by Doppler ultrasonography every 48h, between Days 25 and 33, to access CL vascularization according to the resynchronization protocol. Statistical analysis was performed using the GLIMMIX procedure of SAS®. No treatment effect (P=0.77), time (P=0.11) and interaction (P=0.81) between treatment and time was observed for CL vascularization rate. Therefore, the CL vascularization rate remained similar between the experimental groups during the experimental period (Day 25: 76.1, Day 27: 79.1, Day 29: 77.5, Day 31: 76.3 and Day 33: 77.1%). In conclusion, the resynchronization using 2mg of EB, 25µg of lecirelin or a combination of both after TAI results in similar pregnancy rate after 1st TAI and after resynchronization. Still, EB administration at the beginning of resynchronization protocol does not compromise the CL vascularization of females previously inseminated." @default.
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• W2626951074 date "2015-03-01" @default.
• W2626951074 modified "2023-09-26" @default.
• W2626951074 title "Estradiol, GnRH or their association at the beginning of the resynchronization protocol results in similar reproductive efficiency in dairy cows" @default.
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