Efeito do meloxicam sobre as taxas de concepção de vacas da raça holandesa, de alta produção, submetidas à transferência de embrião, inseminação artificial e inseminação artificial em tempo fixo
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Data
2012-07-13
Autores
Ranieri, Andressa Lavezzo [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O objetivo deste trabalho foi avaliar o efeito do meloxicam sobre a taxa de concepção inicial (TCi), final (TCf) e perda gestacional (PG) de vacas Holandesas de alta produção submetidas à Transferência de Embrião (TE) Inseminação Artificial (IA) e Inseminação Artificial em Tempo Fixo (IATF). Na TE foram utilizadas, como receptoras de embrião, 492 vacas em lactação repetidoras de serviço. Na IA (n=312) e IATF (n=336) foram incluidas no estudo somente fêmeas recém paridas (com pelo menos 60 dias em lactação). Todas as fêmeas foram avaliadas e alocadas em um de dois grupos experimentais: Grupo Controle (GC) e Grupo Tratado (GT). O tratamento consistiu na administração i.m. de meloxicam injetável 2% (0,5mg/kg de peso) nos dias 7, 8 e 9 após a inovulação das receptoras de embrião, e nos dias 14, 15 e 16 da possível gestação das fêmeas submetidas a IA e IATF. Amostras de sangue foram colhidas nos D14 e D21 para posterior dosagem de progesterona (P4). O diagnóstico de gestação ocorreu aos 25-38 e 39-52 dias. O tratamento com o antiinflamatório não incrementou as TCi, TCf e tampouco diminuiu a PG em nenhuma das três biotecnologias. Contudo, observou-se que receptoras de embrião inovuladas com embriões congelados/descongelados do GT tiveram TCi e TCf menores que as do GC (GT= 25,8% v. GC=37,8%) .Não houve diferença na concentração sérica de progesterona de vacas do GC e do GT no D21. Contudo, houve efeito da estação do ano sobre as concentrações de P4 no D14 e D21 tanto na TE como na IA e IATF. Ainda, vacas gestantes apresentaram maiores concentrações de P4 que vacas não gestantes no D21. Conclui-se que o tratamento com meloxicam não incrementou as TCi, TCf, tampouco reduziu a PG de vacas Holandesas de alta produção
The aim of this study was to evaluate the effect of meloxicam on initial conception rate, final conception rate and pregnancy loss of high-producing Holstein cows submitted to embryo transfer (ET), artificial insemination (AI) and timed artificial insemination (TAI). On ET, 492 repeat breeders in milk were used as recipients. On AI (n=312) and TAI (n=336) only freshly calved cows (with at least 60 days in milk) were included in the study. The animals were evaluated and allocated in one of two experimental groups: Control Group (CG) and Treated Group (TG). The treatment consisted on administration of meloxicam 2% i.m. (0.5mg/kg of weight) on days 7, 8 and 9 after inovulation of embryo recipients, and on days 14, 15 and 16 of the possible pregnancy of females submmited to AI and TAI. Blood samples were collected on D14 and D21 for progesterone assay. The diagnosis of pregnancy was done on days 25-38 and 39-52. The treatment with the antiinflamatory did not increase initial conception rates and final conception rates, nor decreased pregnancy loss of animals in all three biotechnologies. However, recipients of TG inovulated with frozen/thawed embryos had lesser initial and final conception rates than CG (TG= 25.8% v. CG=37.8%) There was no difference on progesterone serum concentration of cows from TG and CG on D21. However, there was a season effect on P4 concentrations on D14 and 21 for ET, AI and TAI. Pregnant cows had higher P4 concentrations than non-pregnant cows. In conclusion, the treatment with meloxicam did not increase initial and final conception rates, neither decreased pregnancy loss of high producing Holstein cows
The aim of this study was to evaluate the effect of meloxicam on initial conception rate, final conception rate and pregnancy loss of high-producing Holstein cows submitted to embryo transfer (ET), artificial insemination (AI) and timed artificial insemination (TAI). On ET, 492 repeat breeders in milk were used as recipients. On AI (n=312) and TAI (n=336) only freshly calved cows (with at least 60 days in milk) were included in the study. The animals were evaluated and allocated in one of two experimental groups: Control Group (CG) and Treated Group (TG). The treatment consisted on administration of meloxicam 2% i.m. (0.5mg/kg of weight) on days 7, 8 and 9 after inovulation of embryo recipients, and on days 14, 15 and 16 of the possible pregnancy of females submmited to AI and TAI. Blood samples were collected on D14 and D21 for progesterone assay. The diagnosis of pregnancy was done on days 25-38 and 39-52. The treatment with the antiinflamatory did not increase initial conception rates and final conception rates, nor decreased pregnancy loss of animals in all three biotechnologies. However, recipients of TG inovulated with frozen/thawed embryos had lesser initial and final conception rates than CG (TG= 25.8% v. CG=37.8%) There was no difference on progesterone serum concentration of cows from TG and CG on D21. However, there was a season effect on P4 concentrations on D14 and 21 for ET, AI and TAI. Pregnant cows had higher P4 concentrations than non-pregnant cows. In conclusion, the treatment with meloxicam did not increase initial and final conception rates, neither decreased pregnancy loss of high producing Holstein cows
Descrição
Palavras-chave
Bovino de leite - Reprodução, Meloxicam, Gravidez, Bovino - Inseminação artificial, Transferência de embriões, Cattle - Artificial insemination
Como citar
RANIERI, Andressa Lavezzo. Efeito do meloxicam sobre as taxas de concepção de vacas da raça holandesa, de alta produção, submetidas à transferência de embrião, inseminação artificial e inseminação artificial em tempo fixo. 2012. xi, 103 f. Dissertação (mestrado) - Universidade Estadual Paulista, Faculdade de Ciências Agrárias e Veterinárias, 2012.