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Administration of hCG on the seventh day after initiation of estrus may circumvent negative effects of cervical relaxation protocol in sheep: Preliminary results. Repositório Alice
ARRAIS, A. M.; MELLO, M. R. B.; CORTÊS, L. R.; BONATO, G. C.; OLIVEIRA, T. A.; CARVALHO, B. P.; FONSECA, J. F. da.
Cervical relaxation with association of estradiol benzoate, cloprostenol and oxytocin allows a cervical transposition and embryo collection in sheep by the non-surgical method (Fonseca et al., Theriogenology, 86: 144-151, 2016). However, in recipients, the use of this protocol becomes impracticable due to the use of cloprostenol, which is a luteolytic agent. Sheep are known to form accessory luteal bodies after hCG administration seven days after the onset of estrus (Castro et al., Anim. Reprod., 12: 148, 2015). Therefore, the objective of this study was to develop a cervical relaxation protocol in embryo recipient ewes without compromising future gestation. The data were presented in a descriptive way. Thirteen ewes were observed in estrus out of 24...
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: HCG; Embryo collection; Drug effects; Relaxamento cervical; Oestrogens; Estradiol; Ovino; Reprodução Animal; Transferência de Embrião; Sheep; Ewes; Animal reproduction; Benzoates; Estrus; Cloprostenol; Oxytocin receptors; Embryo transfer; Body weight.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1095117
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Development of a novel 21-day reinsemination program, ReBreed21, in Bos indicus heifers. Repositório Alice
ANDRADE, J. P. N.; GOMEZ-LÉON, V. E.; ANDRADE, F. S.; CARVALHO, B. P.; LACOUTH, K. L.; GARCIA, F. Z.; JACOB, J. C. F.; SALES, J. N. S.; WILTBANK, M. C.; MELLO, M. R. B..
The aim was to develop a program for resynchronization of ovulation (ReBreed21) that allowed reinsemination of non-pregnant Bos indicus heifers every 21 d using timed AI (TAI) without the need for detection of estrus. The Rebreed21 program begins 12 d after previous TAI (Day 0) by inserting an intravaginal P4 implant (Day 12) that is removed 7 d later (Day 19) combined with treatment with 300 IU of eCG. On Day 21, early pregnancy diagnosis (Doppler PD) is performed based on CL vascularity. Nonpregnant (NP) heifers immediately received AI combined with 100 mg of GnRH. The program is replicated 12 d after second TAI to produce a breeding season (BS) of 42 d with 3 potential TAIs. Two ex periments were conducted as a proof of concept for this rapid rebreeding...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: ReBreed21; Ressincronização; Resynchronization; Razas zebú; Vaquilla; Cruce de animales; Métodos de mejoramiento genético; Inseminación artificial; Ovulación; Reprodução Animal; Gado Zebu; Bos Indicus; Gado Nelore; Novilho; Inseminação Artificial; Ovulação; Zebu breeds; Nellore; Heifers; Animal breeding; Breeding methods; Artificial insemination; Ovulation.
Ano: 2020 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1124659
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