Effect of climate on superovulatory response, quality and stage of embryonic development in tropical cattle.
Abstract
High or low temperatures (nortes or cold front, in the tropics), solar radiation, humidity are factors that influence productivity and reproductive activity in tropical cattle. These conditions and the genotype of the cattle are determinant in an embryo transfer program. Response to superovulation treatments, embryo quality and embryo development are affected by these factors. Heat stress is defined as any combination of climatic factors that may cause the animals' comfort zone temperature to be above or below physiological tolerable conditions. In the present work two cases are described where extreme temperature (heat and cold) affected the response to superovulation, the degree of embryo development and the percentage of transferable embryos, in case number 1 heat stress in the state of Sinaloa 21.04 % was obtained and in case # 2 cold front "north" in the state of Veracruz 28.12 %. Highlighting that in these two embryo transfer programs the average of recovered structures is within the reported ranges, it is notorious the poor embryo development and the number of oocytes obtained.
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