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Influence of temperature-humidity index on conception rate of Nelore embryos produced in vitro in northern Brazil

机译：温湿度指数对巴西北部体外生产的Nelore胚胎概念率的影响

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摘要

Considering the high temperatures that the tropical climate provides to most of Brazil and the effects of thermal stress on reproductive processes, the objective of the present study was to analyze, in the warmer months of 2016, conception rates of Nelore bovine embryos in Acre state. For this purpose, oocytes were aspirated (ultrasound-guided follicular aspiration), matured, fertilized with Nelore bull semen, cultured for 6 days, and then the embryos were transferred to crossbred recipients. Pregnancy diagnosis was performed 30 and 60 days after embryo transfer. Meteorological data were obtained at to generate temperature-humidity index (THI). The data from the conception rates and periods of the year were submitted to the chi-square test at 5% probability to verify independence. Regression analysis was used to verify the relationship between THI and gestation rate. There was a strong relationship between conception rates and THI values, verified by an increase in conception rates as THI values were reduced and a decrease when THI reached the highest value. Our findings demonstrated a negative effect of heat stress in conception rates of crossbred cows in northern Brazil.
机译：考虑到热带气候为大多数巴西提供的高温以及热应力对生殖过程的影响，本研究的目的是在2016年较温暖的月份进行分析，在英亩状态下的Nelore牛胚胎的概念率。为此目的，吸气（超声引导的毛囊抽吸），用Nelore Bull Semen施肥，培养6天，然后将胚胎转移到杂交受体中。妊娠诊断在胚胎转移后30和60天进行。获得气象数据以产生温度湿度指数（THI）。来自概念率和年度的数据以5％的概率提交给Chi-Square测试以验证独立性。回归分析用于验证THI与妊娠率之间的关系。在概念率和THI值之间存在强有力的关系，通过增加概念率的增加，因为当达到最高价值时，由于THI值减少并且减少了。我们的研究结果表明了巴西北部杂交牛的概念率的热应力的负面影响。

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