Título:	Avaliação de diferentes doses de ecg na ressincronização da ovulação em vacas nelore lactantes submetidas à iatf
Outros títulos:	Evaluation of different ecg doses in resynchronization of ovulation in lactating nelore cows subjected to fixed-time insemination
Autor(es):	Doroteu, Emanuel Mourão
Orientador(es):	Pivato, Ivo
Assunto:	Bovino - reprodução Ovulação Inseminação artificial Glicoproteínas
Data de publicação:	20-Nov-2014
Data de defesa:	31-Mar-2014
Referência:	DOROTEU, Emanuel Mourão. Avaliação de diferentes doses de ecg na ressincronização da ovulação em vacas nelore lactantes submetidas à iatf. 2014. 52 f., il. Dissertação (Mestrado em Ciências Animais)—Universidade de Brasília, Brasília, 2014.
Abstract:	The economic efficiency of livestock beef cattle is linked to the production of calves, which are destined for meat production or herd replacement. In order to provide a second chance for the cows that were diagnosed as not pregnant, the use of resynchronization has been widespread in livestock beef cattle. The objective of this study was to evaluate the efficiency of the use or not of eCG in resynchronization in lacting pluriparous Nelore cows with interval of 35-75 days postpartum, to understand the interaction between dose, presence or absence estrus, presence or absence of the corpus luteum and rate pregnancy. 775 cows were used in the first fixed-time artificial insemination (FTAI) and the not pregnancy (449) were used after 30 days, they were divided into 3 homogeneous groups in a balanced way. The ultrasonographic examination to observe the presence or absence of corpus luteum was performed before the first FTAI and the resynchronization moment. All the experimental animals received the same protocol, however with different doses of eCG. On the day 0 the cows received a new intravaginal device containing 1 g of progesterone (Sincrogest®, Ouro Fino, Brazil) and was administrated intramuscularly 2 mg of oestradiol benzoate (Sincrodiol®, Ouro Fino, Brazil). On the day 8 the devices were removed and was administrated IM 1 mg of oestradiol cypionate (ECP®, Pfizer Saúde Animal, Brazil), 0,530 mg cloplostenol sodium (Sincrocio®, Ouro Fino, Brazil), Group-0 did not received eCG, Group-200 did received 200 IU of eCG (Folligon®, Intervet / Schering-Plough, Brazil), and Group-300 did received 300 IU. Heat was observed and all the cows were inseminated 48 hours after the removal of the progesterone intravaginal device. Pregnancy diagnosis was performed 30 days after artificial insemination. The likelihood ratio test was applied to determine the importance of each variable or interaction model. The McNemar test was used to compare the proportion of cows with corpus luteum. In animals in estrus after withdrawal of progesterone device, the different treatments (0 IU, 200 IU, 300 IU eCG) did not alter the occurrence of pregnancy. Also the 2 doses of eCG did not differ in relation to pregnancy rate. In animals that did not show estrus there were no difference in incidence of pregnancy among the Group -200 and Group- 300. The percentage of cows that had the first corpus luteum (16.26%) is significantly lower than those who had the second corpus luteum (67.26 %). The cumulative pregnancy rate after 40 days of breeding season was 77.54 %. According to this study, doses of 200 IU and 300 IU eCG resynchronization when used in the first 30 days after FTAI, had no difference in the probability of pregnancy. The cumulative pregnancy rate at 40 days of breeding season enables this tool as a way to optimize the reproductive management of beef cattle farms.
Unidade Acadêmica:	Faculdade de Agronomia e Medicina Veterinária (FAV)
Informações adicionais:	Dissertação (mestrado)—Universidade de Brasília, Faculdade de Agronomia e Medicina Veterinária, 2014.
Programa de pós-graduação:	Programa de Pós-Graduação em Ciências Animais
Licença:	A concessão da licença deste item refere-se ao termo de autorização impresso assinado pelo autor com as seguintes condições: Na qualidade de titular dos direitos de autor da publicação, autorizo a Universidade de Brasília e o IBICT a disponibilizar por meio dos sites www.bce.unb.br, www.ibict.br, http://hercules.vtls.com/cgi-bin/ndltd/chameleon?lng=pt&skin=ndltd sem ressarcimento dos direitos autorais, de acordo com a Lei nº 9610/98, o texto integral da obra disponibilizada, conforme permissões assinaladas, para fins de leitura, impressão e/ou download, a título de divulgação da produção científica brasileira, a partir desta data.
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