HG2P and HG2PM mice of both sexes displayed significant decreases in post-weaning body weights and growth rates (Additional Table 3). In addition, the HG2M strain displayed highly significant decreases in length, similar to B62M mice (Table 2). These results indicate QTL within Region II shared between the HG2P and HG2PM strains decrease body size, weight gain and NA (only in females), while a QTL in the HG2M region significantly decreases tail length.