Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient ...

Modern life makes us tired, right? But research from societies in Africa and South America suggests people in the ancient ...

巴西半干旱地区一牛群出现繁殖问题。研究人员对此展开牛生殖道毛滴虫病（Tritrichomonas foetus）研究，发现感染率为 30.4%，确认引入的母牛为感染源。该研究首次报道此地感染情况，强调防控意义。 在巴西东北部帕拉伊巴州科雷马斯市的一个养牛场，发生了一场 ...