Influência do estresse calórico na produção in vitro de oócitos e embriões de vacas Holandesas de alta produtividade
DOI:
https://doi.org/10.1590/1809-6891v23e-71852EResumo
Objetivou-se avaliar a influência do estresse térmico em oócitos utilizados na produção in vitro de embriões (PIV) bovinos da raça Holandesa de alta produtividade no dia da aspiração folicular (OPU; 0), 30, 60 e 90 dias antes da OPU. A partir da temperatura média no dia 0 e aos 30, 60 e 90 dias anteriores, foram classificados nos grupos conforto (CT; até 15°C) e estresse por calor (ET - acima de 15°C). Observou-se influência negativa em oócitos e embriões viáveis (total e grau I). A submissão ao estresse térmico nos períodos de 30 e 60 dias anteriores à OPU resultou em menor produção de oócitos viáveis (P=0,0028; P=0,0092, respectivamente). Sob estresse, no dia da OPU (ET-OPU), as vacas não apresentaram redução na quantidade de oócitos viáveis (P=0,5497) e não houve influência da temperatura para o grupo estressado 90 dias antes da OPU (P=0,8287). Para embriões totais, a diferença ocorreu apenas no grupo ET-30 (P=0,0317), onde os grupos ET-OPU, ET-60, ET-90 apresentaram, respectivamente, P=0,1987, P=0,0596 e P=0,4580. Em relação à produção de embriões grau 1, não houve diferença para os grupos ET-OPU (P=0,2291) e ET-90 (P=0,2868), porém houve redução para ET-30 (P=0,0143) e ET- 60 (P=0,0253). Em resumo, o estresse por calor teve impacto negativo quando ocorreu 30 ou 60 dias antes da aspiração folicular. Além disso, 30 dias parece ser o período de maior suscetibilidade e que causa os maiores efeitos deletérios na viabilidade oocitária e na PIV.
Palavras-chave: Hipertermia; Estresse térmico; Aspiração Folicular; Vacas leiteiras.
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