Protein synthetic efficiency (KRNA) and protein synthetic capacity (RNA/TP) for pooled hind limb muscles from Control mice, mice undernourished from PN1 to PN11 (Early-UN) or PN11 to PN22 (Late-UN), or refed (RF) for 2 days, 7 days, 21 days, or 18 months. KRNA was calculated from the fractional synthesis rate and RNA content (RNA/TP). Values are least square means ± SEM; n = 7–8 litters per treatment group.*Significant difference between age-matched groups where age×group is significant.