Efeito do dispositivo de progesterona adicional durante protocolo de IATF e TETF à base de E2/P4 na fertilidade de vacas em lactação com baixa P4
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2013-12-18
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Universidade Estadual Paulista (Unesp)
Resumo
Objetivou-se com este estudo avaliar a utilização de dois dispositivos intravaginais de P4 (CIDR®, Zoetis) em vacas Holandesas em lactação sem CL e com P4 ≤1,0 ng/mL no início de um protocolo de sincronização da ovulação à base de E2/P4 para IATF (exp 1) ou TETF (exp 2) no sucesso da prenhez. Estes experimentos foram realizados em 9 fazendas, sendo 4 destinadas a IATF (n = 341) e 5, a TETF (n = 356). O protocolo utilizado nos experimentos foi: d-10 2mg IM BE (2,0mL de Estrogin, Farmavet, SP, Brasil) + CIDR (1,9g de P4, CIDR®, Zoetis, SP, Brasil); d-3 25mg IM Dinoprost Trometamina (5,0mL de Lutalyse®, Zoetis, SP, Brasil); d-2 remoção do CIDR + 1mg IM de Cipionato de Estradiol (0,5mL ECP®, Zoetis, SP, Brasil); d 0 IATF (exp1) ou d 7 TETF (exp 2). No d-10, os animais sem corpo lúteo à ultrassonografia (US) foram distribuídos aleatoriamente para receberem 1 CIDR (1CIDR) ou 2 CIDR (2CIDR). O diâmetro do folículo ovulatório [d0 (exp 1)] e presença de CL [d7 (exp 1 e 2)] foram avaliados por US. Amostras de sangue foram colhidas para dosagem de P4 nos dias -10, -3 e 7. Foram consideradas sincronizadas vacas com CL 7 dias após a IA (d7) ou com CL no momento da TE, consistente com a ovulação do folículo ovulatório; no exp 2, apenas vacas com CL (d7) que receberam embrião foram utilizadas. Diagnósticos de gestação foram realizados por US aos 32 e 60 d. Para avaliar as variáveis binomiais, foi utilizado o PROC GLIMMIX, e as contínuas, o PROC MIXED. Efeitos foram considerados significantes quando P ≤0,05 e tendência quando P >0,05 e P ≤0,10. Não houve efeito do tratamento na taxa de sincronização [1CIDR = 74,1% (329/451) vs. 2CIDR = 71,1% (298/423)]. A concentração de P4 no d-10 não diferiu entre os tratamentos (1CIDR = 0,59 ± 0,12 ng/mL vs. 2CIDR = 0,68 ± 0,12 ng/mL)...
The aim of this study was to evaluate the use of two progesterone (P4) intravaginal devices (CIDR ®, Zoetis) in lactating Holstein cows without CL with P4 ≤ 1.0 ng / mL at the start of a E2/P4 ovulation synchronization protocol for TAI (exp 1) or TET (exp 2) on pregnancy success. These experiments were conduced in 9 farms, 4 destined to TAI (n = 341) and 5 TET (n = 356). The protocol used in the experiments was: d-10 2 mg IM EB (2.0 mL Estrogin, Farmavet, SP, Brazil) + CIDR (1.9 g of P4, CIDR ®, Zoetis, SP, Brazil); d-3 25 mg dinoprost tromethamine IM (5.0 mL Lutalyse ®, Zoetis, SP, Brazil), d-2 CIDR removal + 1 mg estradiol cypionate IM (0.5 mL, ECP ®, Zoetis, SP, Brazil); TAI d0 (exp 1) or TET d7(exp 2). On d-10, animals without a corpus luteum detected by ultrasonography (US) were randomly divided into groups to receive 1 CIDR (1CIDR) or 2 CIDR (2CIDR). The ovulatory follicle diameter [d0 (exp 1)] and presence of CL [d7 (exp 1 and 2)] were evaluated by US. Blood samples were collected for P4 measurement on days -10, -3 and 7. Were considered synchronized cows when they had CL 7 days after AI (d7) or CL at the time of ET, consistent with ovulation of detected ovulatory follicle; In exp 2 only cows CL (d7) receiving embryo were used. Pregnancy diagnosis were performed using US on days 32 and 60. Was used to evaluate binomial variables PROC GLIMMIX and PROC MIXED for continuous. Effects were considered significant when P ≤ 0.05 and tendency when P> 0.05 and P ≤ 0.10. There was no effect of treatment on synchronization rate [1CIDR = 74.1% (329/451) vs. 2CIDR = 71.1% (298/423). P4 concentration on d-10 did not differ between treatments (1CIDR = 0.59 ± 0.12 ng/mL vs. 2CIDR = 0.68 ± 0.12 ng/mL). P4 concentration was higher for 2CIDR treatment (2.14 ± 0.31 ng / mL) compared to 1CIDR (1.71 ± 0.28 ng / mL) at d-3 (PGF moment)... (Complete abstract click electronic access below)
The aim of this study was to evaluate the use of two progesterone (P4) intravaginal devices (CIDR ®, Zoetis) in lactating Holstein cows without CL with P4 ≤ 1.0 ng / mL at the start of a E2/P4 ovulation synchronization protocol for TAI (exp 1) or TET (exp 2) on pregnancy success. These experiments were conduced in 9 farms, 4 destined to TAI (n = 341) and 5 TET (n = 356). The protocol used in the experiments was: d-10 2 mg IM EB (2.0 mL Estrogin, Farmavet, SP, Brazil) + CIDR (1.9 g of P4, CIDR ®, Zoetis, SP, Brazil); d-3 25 mg dinoprost tromethamine IM (5.0 mL Lutalyse ®, Zoetis, SP, Brazil), d-2 CIDR removal + 1 mg estradiol cypionate IM (0.5 mL, ECP ®, Zoetis, SP, Brazil); TAI d0 (exp 1) or TET d7(exp 2). On d-10, animals without a corpus luteum detected by ultrasonography (US) were randomly divided into groups to receive 1 CIDR (1CIDR) or 2 CIDR (2CIDR). The ovulatory follicle diameter [d0 (exp 1)] and presence of CL [d7 (exp 1 and 2)] were evaluated by US. Blood samples were collected for P4 measurement on days -10, -3 and 7. Were considered synchronized cows when they had CL 7 days after AI (d7) or CL at the time of ET, consistent with ovulation of detected ovulatory follicle; In exp 2 only cows CL (d7) receiving embryo were used. Pregnancy diagnosis were performed using US on days 32 and 60. Was used to evaluate binomial variables PROC GLIMMIX and PROC MIXED for continuous. Effects were considered significant when P ≤ 0.05 and tendency when P> 0.05 and P ≤ 0.10. There was no effect of treatment on synchronization rate [1CIDR = 74.1% (329/451) vs. 2CIDR = 71.1% (298/423). P4 concentration on d-10 did not differ between treatments (1CIDR = 0.59 ± 0.12 ng/mL vs. 2CIDR = 0.68 ± 0.12 ng/mL). P4 concentration was higher for 2CIDR treatment (2.14 ± 0.31 ng / mL) compared to 1CIDR (1.71 ± 0.28 ng / mL) at d-3 (PGF moment)... (Complete abstract click electronic access below)
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Progesterona - Bovino, Bovino - Inseminação artificial, Transferência de embriões - Bovino, Bovino de leite, Cattle -Artificial insemination
Como citar
SANCHES JUNIOR, Carlos Patrício. Efeito do dispositivo de progesterona adicional durante protocolo de IATF e TETF à base de E2/P4 na fertilidade de vacas em lactação com baixa P4. 2013. x, 58 f. Dissertação (mestrado) - Universidade Estadual Paulista Júlio de Mesquita Filho, Faculdade de Medicina Veterinária e Zootecnia de Botucatu, 2013.