528 



APPENDIX 

 TABLE A— 9. Nutrient Requirements for Chickens* i 



(In Percentage or Amount Per Pound of Feed) 



* Committee on Animal Nutrition, National Academy of Sciences, National Research Council, revised 

 1954. 



1 These figures are estimates of requirements and include no margins of safety. 

 '' May be vitamin A or pro-vitamin A. 



' This amount of calcium need not be incorporated in the mixed feed, inasmuch as calcium supplements 

 fed free choice are considered as part of the ration. 



* At least 0.45% of the total feed of starting chickens should be inorganic phosphorus. All the phos- 

 phorus of non-plant feed ingredients is considered to be inorganic. Approximately 30% of the phosphorus 

 of plant products is non-phytin phosphorus and may be considered as part of the inorganic phosphorus 

 required. A portion of the phosphorus requirement of growing chickens and laying and breeding hens 

 must also be supplied in inorganic form. For birds in these categories the requirement for inorganic phos- 

 phorus is lower and not as well defined as for starting chickens. 



^ This figure represents salt or sodium chloride added as such or in marine or fermentation products of 

 high sodium chloride content. 



