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Protein Requirements of Young Chinese Male Adults on Ordinary Chinese Mixed Diet and Egg Diet at Ordinary Levels of Energy Intake¹

Department of Biochemistry, College of Medicine, National Taiwan University, Taipei, Taiwan, Republic of China

With a total of 28 normal, healthy male adults, N balance studies with both Chinese mixed diet and egg diet were conducted at four protein levels the former (0.45, 0.55, 0.65 and 0.75 g·kg^-1·day^-1) and at three protein levels with the latter (0.35, 0.45 and 0.55 g·kg^-1·day^-1) at ordinary levels of energy intake. By regression analysis, the mean maintenance N requirement (PR_m) of the mixed Chinese diet calculated was 127.0 mg·kg^-1·day^-1 (0.79 g protein·kg^-1·day^-1). Estimate of allowance for individual variation to cover the 97.5% population (PR_0.975) was 188.1 mg·kg^-1·day^-1 (1.18 g protein·kg^-1·day^-1). As for the egg diet series, PR_m and PR_0.975 were 98.2 mg N·kg^-1·day^-1 (0.61 g protein·kg^-1·day^-1) and 141.6 mg N·kg^-1·day^-1 (0.89 g protein·kg^-1·day^-1), respectively. Net protein utilization (NPU) of egg diet protein was significantly higher than that of the Chinese mixed diet protein (P < 0.01), with mean values of 56 versus 43. True digestibility of the mixed diet and egg diet proteins was 96.5 and 98%, respectively. The efficiency of utilization of the Chinese mixed diet protein was 73–77% of the egg protein, based on relative N requirements.

KEY WORDS: • protein requirements • young male adults • Chinese mixed diet protein • egg protein

¹ Supported by the National Science Council of the Republic of China. Grant No.: NSC-66B-0412-02(32), NSC-68B-0412-02(10).

² Present address: Department of Microbiology, College of Science, Soochow University, Taipei, Taiwan, Republic of China.

Manuscript received 13 August 1981.

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