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- W2599962010 abstract "This study evaluated the use of different doses (300 or 400 IU) of equine chorionic gonadotrophin (eCG) in FTAI protocols of 8 or 9 days of progesterone device treatment (P4) on the occurrence of estrus and pregnancy rates in suckled bos taurus beef cows. Were used 1171 cows with a body condition score of 2.81 ± 0.48 (scale of 1 to 5), from six commercial farms located in three different regions of the Rio Grande do Sul state, Brazil and maintained in native pasture. At the beginning of the protocol cows were divided into two treatments: 9d (D-1, n = 591) or 8d (D0, n = 580) of progesterone device treatment (P4, CIDR®, Zoetis, Brazil) associated with 2mg Estradiol Benzoate (IM; Gonadiol®, Zoetis, Brazil). On day 8, CIDR was removed and administered IM 12.5 mg of DinoprostTromethamine (Lutalyse®, Zoetis, Brazil) and 1 mg Estradiol Cypionate IM (E.C.P.®, Zoetis, Brazil). At this time, the cows were randomized with homogeneous distribution in two treatments: 300 IU (n = 605) or 400 IU (n = 566) of eCG (Novormon®, Zoetis), making a total of 4 groups D8300IU (n = 303), D8400IU (n = 277), D9300IU (n = 302) e D9400IU (n = 289). The TAI was performed 48 hours after removal of P4. Although females were the base of the tail painted with ink stick (Raidl-Maxi, Raidex GmbH, Dettingen/Erms, Germany) at the time of the withdrawal of P4 device. Females who did not have ink at the time of FTAI were considered in estrus. Statistical analyses were performed using the GLIMMIX procedure of SAS. There was interaction between the length of stay device P4 and eCG dose (P = 0.66). When eCG dose was 300 IU, the treated cows for 8 days (60.4%) had lower estrus occurrence than treated cows for 9 days (70.8%). Female treated with 400 IU of eCG, irrespective of length of stay device P4 had intermediate rates (D8 = 66.8% e D9 = 68.9%). Regarding pregnancy rate had interaction trend (P = 0.10) between length of stay device P4 and eCG dose [D8-300IU (40.3%), D8-400IU (45.9%), D9-300IU (45.0%) e D9-400IU (42.2%)]. In conclusion, female treated with P4 for 8 days and 300 IU of eCG had reduced the estrus occurrence e trend to reduce pregnancy rate." @default.
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- W2599962010 date "2016-03-01" @default.
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- W2599962010 title "Dose of equine chorionic gonadotropin (300 or 400 IU) and length of stay (8 or 9 days) progesterone device in FTAI protocols with suckled Bos taurus beef cows: impact on the occurrence of estrus and pregnancy rate" @default.
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