“…Likewise, Harper and Austad (2000) developed a noninvasive method for measuring adrenal activity in house mice, deer mice, and red-back voles (members of Muridae and Cricetidae families), as other authors did in old field mice (Cricetidae family; Good et al, 2003), in spiny mice (Acomys cahirinus; Muridade family) (Nováková et al, 2008;Frynta et al, 2009), in agouti and non-agouti deer mice (Peromyscus maniculatus; Cricetidae family) (Hayssen et al, 2002), and in Columbian ground squirrel (Sciuridae family) (Bosson et al, 2009). Similarly, although most of those authors did not perform a previous radioinfusion study, a noninvasive assessment proved to be useful also in different reproductive studies conducted in others small rodents (DeCantanzaro et al, 2003;Kuznetzov et al, 2004;Cavigelli et al, 2005;Chelini et al, 2005). In mice, corticosterone and testosterone are excreted mainly by feces.…”