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GnRH potential to synchronize follicular emergence and ovulation prior to superovulatory day 0 protocol in sheep. Repositório Alice
SOUZA-FABJAN, J. M. G.; BALARO, M. F. A.; BARBOSA, T. G. B.; FONSECA, J. F. da; FIGUEIRA, L. M.; TEIXEIRA, T. A.; CARVALHEIRA, L. R.; BRANDÃO, F. Z..
The role of GnRH to synchronize ovulation and follicular emergence previous to superovulatory protocol, started on the first day of the estrous cycle (Day 0), was assessed in Santa Inês ewes. For estrus synchronization, 60 mg medroxyprogesterone acetate sponges were used for 6 d plus 37.5 ?g d-cloprostenol and 300 IU eCG at fifth day. After sponge removal, ewes were assigned to three treatments: GControl ? saline at 12 h (n = 10); G24h ? GnRH at 24 h (n = 10); or G36h ? GnRH at 36 h (n = 9). In conclusion, considering the beneficial effects of G36h in synchronizing ovulation and to promote the absence of dominant follicles in the first days of estrous cycle. According to data obtained, the best time to start the superovulatory treatment, known as "Day 0",...
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: MOET; Lecirelin; Santa Inês; Ovino; Reprodução animal; Ovulação; Ciclo estral; Superovulação; Progesterona; Estradiol; Sheep; Ewes; Reproduction; Superovulation; Synchronization; Ovulation; Oestrous cycle; Progesterone.
Ano: 2015 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1074286
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Lecirelin and Buserelin (Gonadotrophin releasing hormone agonists) are equally effective for fixed time insemination in buffalo Braz. J. Vet. Res. Anim. Sci.
BARUSELLI,Pietro Sampaio; AMARAL,Renato; BARUFI,Francisco Bonomi; VALENTIM,Renato; MARQUES,Marcio de Oliveira.
Buffalo has peculiar reproductive patterns, which make artificial insemination programs a hard and expensive task. Artificial insemination in fixed time is advantaged because females show low incidence of homosexual behaviour and strong dominance relationships, which leads to a poor accuracy in estrus detection. The aim of this experiment was to compare the efficiency of two different GnRH agonists in the GnRH/PGF2alpha/GnRH protocol (Buserelin vs Lecirelin). Two hundred and seventy buffaloes with 45 to 60 days postpartum were synchronized and fixed-time inseminated. The animals were kept on pasture in two farms at São Paulo and Mato Grosso do Sul (Brazil). Cows in Group 1 (n = 132) received, intramuscularly, 20 µg of Buserelin at a random day of the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Buffalo; Synchronization of ovulation; GnRH; Lecirelin; Buserelin.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-95962001000300009
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