Eficiência do protocolo superestimulatório P36, associado à administração de eCG ou LH, em animais da raça Nelore
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Data
2012-08-16
Autores
Cury, José Renato Laino Martinelli [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O protocolo denominado P36 tem sido amplamente utilizado para induzir ovulação múltipla e permitir a inseminação artificial em tempo fixo (IATF) facilitando o manejo de doadoras de embriões. Estudos recentes com o P36 indicam que a substituição das duas últimas doses de FSH por eCG pode melhorar a produção de embriões, possivelmente por sua atividade LH. Objetiva-se com o presente trabalho comparar o protocolo P36 com o tratamento superestimulatório convencional (com observação do estro) e testar, em vacas da raça Nelore, a substituição da eCG pela aplicação simultânea de FSH e LH no último dia de tratamento superestimulatório. Vacas Nelore (n=16) foram distribuídas aleatoriamente em 4 grupos: superovulação convencional com observação de estro (Controle), P36, P36/eCG e P36/FSH+LH. Os tratamentos foram feitos em modelo cross-over, ou seja todos os animais passaram pelos 4 tratamentos. No grupo Controle, o tratamento superestimulatório iniciou 10 dias após a observação do estro. As aplicações de FSH foram feitas durante 4 dias consecutivos (133mg, IM), duas vezes ao dia em doses decrescentes. Dois dias após o início do tratamento as doadoras receberam uma dose luteolítica de d-cloprostenol (150μg, IM). As inseminações foram realizadas 12 e 24 horas após a detecção do estro. No grupo P36, em dia aleatório do ciclo estral (D0), as doadoras receberam um dispositivo intravaginal de progesterona (1g) e benzoato de estradiol (3 mg, IM). O FSH (133mg, IM) foi administrado em doses decrescentes, 2 vezes ao dia durante o D4 ao D7. No D6, foi aplicado d-cloprostenol (150μg, IM) e o dispositivo intravaginal foi removido 36h mais tarde. No dia 8, a ovulação foi induzida com 12,5mg de pLH e os animais foram inseminados artificialmente em tempo pré-determinado, sem a observação de...
The P36 protocol has been widely used to induce multiple ovulation and allow for fixed-time artificial insemination (FTAI) facilitating the management of embryo donors. Recent studies with the P36 protocol indicate that the replacement of the last two doses of FSH by eCG can improve embryo yield, possibly due to its LH activity. The objective of this study was to compare the P36 protocol with conventional superestimulatory treatments (with estrus observation) and to test, in Nelore cows, the replacement of eCG by the simultaneous administration of FSH and LH on the last day of the superstimulatory treatment. Nelore cows (n=16) were randomly distributed into four groups: conventional superovulation with estrus observation (control); P36; and P36 / eCG P36 / FSH+LH. The treatments were performed in a crossover model, i.e. all animals passed through the four treatments. In the control group, the superstimulatory treatment started 10 days after estrus observation. Administration of FSH was made in 4 consecutive days (133 mg, IM), twice daily in decreasing doses. Two days after the initiation of treatment donors received a luteolytic dose of d-cloprostenol (150 μg, IM). Insemination was performed 12 and 24 h after estrus observation. In the P36 group, in a random day of estrous (D0), donors received a progesterone intravaginal device (1.0 g) and estradiol benzoate (3.0 mg, IM). The FSH (133 mg, IM) was administered at decreasing doses, twice daily from D4 to D7. In D6, d-cloprostenol was administered (150 μg, IM) and the intravaginal device was removed after 36 h. On day 8, ovulation was induced with 12.5 mg of pLH and the FTAI was performed at 12 and 24 h after pLH administration. Cows from the P36/eCG group were treated similarly to P36 group, except that the last two doses of FSH were replaced by two... (Complete abstract click electronic access below)
The P36 protocol has been widely used to induce multiple ovulation and allow for fixed-time artificial insemination (FTAI) facilitating the management of embryo donors. Recent studies with the P36 protocol indicate that the replacement of the last two doses of FSH by eCG can improve embryo yield, possibly due to its LH activity. The objective of this study was to compare the P36 protocol with conventional superestimulatory treatments (with estrus observation) and to test, in Nelore cows, the replacement of eCG by the simultaneous administration of FSH and LH on the last day of the superstimulatory treatment. Nelore cows (n=16) were randomly distributed into four groups: conventional superovulation with estrus observation (control); P36; and P36 / eCG P36 / FSH+LH. The treatments were performed in a crossover model, i.e. all animals passed through the four treatments. In the control group, the superstimulatory treatment started 10 days after estrus observation. Administration of FSH was made in 4 consecutive days (133 mg, IM), twice daily in decreasing doses. Two days after the initiation of treatment donors received a luteolytic dose of d-cloprostenol (150 μg, IM). Insemination was performed 12 and 24 h after estrus observation. In the P36 group, in a random day of estrous (D0), donors received a progesterone intravaginal device (1.0 g) and estradiol benzoate (3.0 mg, IM). The FSH (133 mg, IM) was administered at decreasing doses, twice daily from D4 to D7. In D6, d-cloprostenol was administered (150 μg, IM) and the intravaginal device was removed after 36 h. On day 8, ovulation was induced with 12.5 mg of pLH and the FTAI was performed at 12 and 24 h after pLH administration. Cows from the P36/eCG group were treated similarly to P36 group, except that the last two doses of FSH were replaced by two... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Zebu - Reprodução, Nelore (Zebu) - Embrião, Transferência de embriões, Embryo transplantation
Como citar
CURY, José Renato Laino Martinelli. Eficiência do protocolo superestimulatório P36, associado à administração de eCG ou LH, em animais da raça Nelore. 2012. 67 f. Dissertação (mestrado) - Universidade Estadual Paulista Julio de Mesquita Filho, Instituto de Biociências de Botucatu, 2012.