Sprague-Dawley rats have a lifespan of about two years and have a high risk of cancer over their lifespan (one study concluded that over eighty percent of males and over seventy percent of females developed cancer under normal conditions).
Sprague Dawley实验鼠的寿命约为两年，在它们的生命周期中，患癌症的风险很高(一项研究得出结论，超过80%的雄性和超过70%的雌性在正常情况下患上了癌症)。