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This study was aimed determine the ratio of crude protein (CP) per total digestibility of nutrients (TDN) intake or CP/TDN intake to body weight gain, emissions of nitrogen and methane in lambs. 30 male Thin-tailed lambs aged 3-4 months with body weights 13.69 ± 2.43 kg (CV = 5.89%) were used in this study. The intake of CP (g) and TDN (g) were obtained from the percentage (%) CP and (%) TDN of each animal. The CP of feed ranges from 14-18% and TDN ranges from 60-70%. Then CP intake was divided by TDN intake (CP/TDN). The relationship between CP/TDN intake and average daily gain (ADG), meat production, nitrogen emissions (N), nitrogen oxide emissions (N2O) and methane gas emissions (CH4) were analyzed using correlation analysis. The number of CP/TDN intake has a strong correlation with ADG, but the CP/TDN intake with. The number of CP/TDN intake with N emissions has a moderate correlation, but the CP/TDN intake with N2O emissions has a strong correlation, while the CP/TDN with CH4 emissions has a weak correlation. The ratio of CP/TDN intake that can be given was in the range of 0.23 - 0.29.