308 



PRODUCTIVE FEEDING OF FARM ANIMALS 



maintain its live weight on distinctly different quantities of the same 

 combinations of feed. This variation appears to be due to the plane 

 of nutrition upon which the pigs have been maintained previous 

 to the time of making the maintenance experiment. He gives the 

 maintenance requirements of pigs that have been previously kept 

 on a low nutritive plane as follows : 



Dietrich Maintenance Standard for Pigs, Per Head, 100 Pounds Live Weight. 



Digestible crude protein Digestible carbohydrates Digestible fat 



0.10 pound 0.25 to 0.40 pound 0.03 pound 



The energy requirements of the ration are about 1.12 therms 

 (p. 35 ). 18 



The rations given in the following table have been calculated 

 according to the rather elaborate system of feeding pigs recom- 

 mended by Dietrich: 



An Approximate Ration for Pigs Intended for Breeding Purposes 



In the place of corn may be substituted rye, barley, wheat, rice, 

 etc., and in the place of soybeans, linseed meal or peas, but in 

 the latter case the quantity fed must be increased, as peas contain 

 less protein than the other feeds. " This would also increase the 

 carbohydrate, hence the corn would have to be correspondingly de- 

 creased. Or these may be left out and more skim milk added. 

 Some of the protein may also be supplied in the form of clover or 

 alfalfa. If skim milk is not available, more of some other nitrog- 

 enous feeds may be supplied, and also more water, as milk is 85 

 to 90 per cent water. If tankage containing 60 per cent protein is 

 used in place of soybean meal, much less will suffice, as tankage is 

 richer in protein. 



"The above is intended for dry lot feeding (Fig. 81). If pigs 

 are on pasture, these quantities should be somewhat reduced. If 

 the above ration is used in a dry lot, a little bran or shorts used 



"Illinois Bulletin 163; Circulars 126, 133, and 153. 



