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peres_rfg_me_botfmvz.pdf: 340579 bytes, checksum: d156d075316c35b86500d5e40a305727 (MD5) / Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) / Universidade Estadual Paulista (UNESP) / O objetivo desses experimentos foi avaliar os efeitos da concentração de progesterona pré e pós-ovulação em fêmeas Nelore submetidas ao protocolo: D0-benzoato de estradiol (2,0mg, Estrogin®) + CIDR®; D9-retirada do dispositivo + cipionato de estradiol (0,5mg, ECP®) + dinoprost trometamina (PGF2α, 12,5mg, Lutalyse®); D11- IATF. No Exp.1, 1.153 novilhas Nelore cíclicas foram divididas aleatoriamente para receber CIDR® sem utilização prévia ou utilizados previamente por 18 dias e 0, 200 ou 300UI de eCG (Folligon®) no D9. No Exp.2, 702 vacas Nelore solteiras foram divididas para receber aplicação de PGF2α no D7 ou D9 e 0 ou 300 UI de eCG no D9. Nestes experimentos o diâmetro do maior folículo (ØFD) foi avaliado no D11. Amostras de sangue para dosagem de P4 foram colhidas no D9 e D18 (7d pós-IATF). No Exp.3, 1.332 vacas paridas foram avaliadas no D7 quanto à presença de CL, sendo divididas para receber PGF2α no D7 ou D9. Amostras de sangue foram colhidas no D9. O diagnóstico de gestação foi realizado no D41. Variáveis contínuas foram avaliadas pelo PROC GLM e binomiais pelo PROC LOGISTIC. Considerou-se efeito significativo quando P<0,05 e tendência quando P<0,1. No Exp.1, as novilhas tratadas com CIDR® sem utilização prévia apresentaram maior [P4D9] (3,06±0,09 vs. 2,53±0,09 ng/ml). A [P4D9] afetou negativamente o ØFD. Novilhas que não receberam eCG apresentaram menor ØFD (0UI: 11,5±0,1a; 200UI: 11,9±0,1b; 300UI: 12,0±0,1bmm). O ØFD afetou positivamente a [P4D18]. Houve efeito de dose de eCG na [P4D18] (0UI: 2,77±0,11a; 200UI: 3,18±0,11b; 300UI: 4,87±0,11cng/ml) e na taxa de sincronização [TS; 0UI: 83,8%(337/402)a; 200UI:88,5%(339/383)ab; 300UI: 94,3%(347/368)b]. A [P4D9] tendeu a afetar negativamente e o ØFD influenciou positivamente a TS. Houve interação entre eCG e [P4D9] na taxa de... / The aim of this trial was to evaluate the effect of pre- and post-ovulatory progesterone concentration in Nellore cattle treated with the protocol: D0-estradiol benzoate (2.0mg, Estrogin®) + CIDR®; D9–CIDR® withdrawal + of estradiol cypionate (0.5mg, ECP®) + dinoprost trometamine (12.5mg, Lutalyse®); D11-TAI. In Exp.1, 1,153 cycling Nellore heifers were randomly assigned to receive on D0 either a non-previously used or a 18d-previously CIDR® and 0, 200UI or 300UI of eCG (Folligon®) on D9. In Exp.2, 702 non-lactating Nellore cows were assigned to receive PGF2α treatment either on D7 or D9 and 0 or 300 IU of eCG on D9. On these experiments, the diameter of the largest follicle (ØFD) was measured on D11. Blood samples were collected on D9 and D18 (seven days after TAI) to evaluate serum progesterone concentrations. In Exp.3, 1,332 suckled Nellore cows were evaluated on D7 for luteal tissue presence. Cows were assigned to receive PGF2α either on D7 or D9. Blood samples were collected on D9. Pregnancy diagnosis was performed on D41. Continuous variables were evaluated by PROC GLM and binary by PROC LOGISTIC. Significant differences were considered when P<0.05 and tendencies when P<0.1. In Exp.1, heifers treated with non-previously used CIDR® had greater [P4D9] (3.06±0.09 vs. 2.53±0.09 ng/ml). The [P4D9] negatively affected the ØFD. There was effect of eCG dosage on ØFD (0IU: 11.5±0.1a; 200IU: 11.9±0.1b; 300IU: 12.0±0.1bmm). The ØFD positively affected the [P4D18]. The eCG dosage influenced the [P4D18] (0UI: 2.77±0.11a; 200UI: 3.18±0.11b; 300UI: 4.87±0.11cng/ml). Treatment with eCG affected synchronization rate [SR; 0IU: 83.8% (337/402)a; 200IU: 88.5% (339/383)ab; 300IU: 94.3% (347/368)b]. The [P4D9] tended to negatively affect, and the ØFD positively affected the SR. There was interaction between eCG and [P4D9] on conception...
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.unesp.br:11449/96640 |
| Date | 04 September 2008 |
| Creators | Peres, Rogério Fonseca Guimarães [UNESP] |
| Contributors | Universidade Estadual Paulista (UNESP), Vasconcelos, José Luiz Moraes [UNESP] |
| Publisher | Universidade Estadual Paulista (UNESP) |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | vi, 87 f. : grafs. ,tabs. |
| Source | Aleph, reponame:Repositório Institucional da UNESP, instname:Universidade Estadual Paulista, instacron:UNESP |
| Rights | info:eu-repo/semantics/openAccess |
| Relation | -1, -1 |
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