522 



APPENDIX 

 TABLE A-4. (Continued) 



Daily 



Feed 



per 



Animal, 



lb. 



Daily Nutrients per Animal 



Total 



Protein, 



lb. 



Digest- 

 ible 



Protein, 

 lb. 



TDN,2 

 lb. 



DE,2 

 therm. 



Ca 



Caro- 

 tene, 

 mg. 



Vitamin 



A,» 



lU X 1,000 



Cows Nursing Calves, First 3-4 Months Postpartum 



900- 

 1,100 



0.0 



28 



2.3 



1.4 



16.8 



34 



30 



23 



100 



40.0 



Normal Growth Heifers and Steers 



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

 1 958. 



• Average daily gain for fattening cattle is based upon cattle receiving stilbestrol. Fattening cattle not 

 receiving stilbestrol gain from 10 to 20 per cent slower than the indicated values. 



2 DE (digestible energy) was calculated on the assumption that 1 g. of TDN (total digestible nutrients) 

 has 4.41 kcal. (large calorie) of digestible energy. New information suggested that the value of 4.41 is more 

 accurate than the 4.45 value often used previously. DE may be converted to metabolizable energy by 

 multiplying by 82 per cent. 1,000 large cal. equal 1 therm. 



3 Multiply figures in column by 1,000. Vitamin A requirement computed on the basis of 1 mg. carotene 

 equals 400 I.U. Vitamin A. 



■• Under some range conditions it may not be economically justifiable to feed pregnant cows during winter 

 months at these levels of total feed and TDN. Short periods of moderate weight loss can be tolerated with- 

 out serious effects. 



