/l/ An essential amino acid (R) is an Indispensable component of the diet because it is not synthesized, from materials 

 ordinELTily available, at a speed sufficient for maintenance of nitrogen balance in the adult and/or normal grovth in the 

 young. /2/ A non-essential amino acid can be synthesized in adequate amounts in the body from other nitrogen sources if 

 not supplied In the diet. Non-essential amino acids can be utilized by man and probably by most other vertebrates. /)/ To 

 obtain recommended intake per person (adult) per day, multiply values by 70 regardless of actual weight unless it repre- 

 sents an extreme departure from 70 kg. Rose, W. C. , finds that requirement does not vary with weight in adult male. /h/ 

 The values In this column represent the minimum requirements as determined for young, healthy males; twice these values is 

 considered a "safe" allowance for normal, healthy males and females, but they probably should be increased more than 

 twice for growth, rehabilitation from disease, and during pregnancy and lactation. /5/ White rat. /6/ New Hampshire. Values 

 in this column are based on a daily food intake of 59 grams per chick. /!/ Broad Breasted Bronze. Values in this column 

 are based on a daily food intake of 56 grams per turkey. /8/ Cocker spaniel. /9/ Values in this column are based on a 

 synthetic diet with amino acids and diammonlum citrate as nitrogen sources. /lO/ Values In this column calculated on basis 

 of 10 grams daily food intake per rat, and with cystine and tyrosine lacking in diet. /ll/ Amino acid requirement is in- 

 creased when protein intake is raised. /12/ Amino acids supplied from egg proteins. /I5/ Amino acids supplied by egg al- 

 bumin. /iV Values In this column represent allowances for rapid weight recovery and protein repletion in adult protein- 

 depleted rats. /15/ Values in this column represent the minimum nitrogen intake that maintained nitrogen balance. /I6/ 

 Synthesized by the rat, but not at sufficient speed for maximum growth. /17/ Data available do not make clear whether all 

 of these amino acids are indispensable or not. /18/ Cystine may replace one sixth of the methionine requirement. /19/ If 

 not supplied in diet, the daily allowance of methionine must be increased correspondingly. /20/ Either glutamic acid or 

 proline may substitute partially for arglnine. /2l/ If tyrosine is present, the phenylalanine requirement may be decreased. 



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