28 o 
Journal of Agricultural Research 
Vol. XXI, No. S 
in lots 2 and 3, showing that the larger amount of protein given lot 3 
had but little apparent influence. 
Continuing the studies on the three lots of pigs mentioned above with 
reference to the ash content of these pigs, the authors ( 11 ) found that 
variations in the amount of digestible protein consumed did not influence 
significantly the percentages of distribution of total and water-soluble 
ash. In further studies on these same lots of pigs, Joseph (7) reports 
that variations in the amounts of protein consumed by growing pigs 
do not seem to affect the nature of the nitrogenous material produced 
during growth. When the supply of body protein is deficient, either 
quantitatively or qualitatively, it seems that only the amount of body 
protein is affected, while the character of the body proteins formed in 
the tissues remains unchanged. 
The experiments conducted at the Kansas Agricultural Experiment 
Station cover a wide range of feeds and extended over a period of six 
years. Each numbered experiment refers to a year’s work. For this 
reason the data obtained in regard to the effect of the character of the 
ration on the chemical composition of pigs are large in amount and varied 
in character. 
PLAN OF THE EXPERIMENTS 
The general plan of these experiments was to feed one lot of young 
growing pigs on com alone, another lot on com and ash, and other lots 
on com supplemented with feeds calculated to supply either the protein 
or ash deficiency in corn, or both such deficiencies. The feeds supplying 
this protein contained ash, except for two lots in experiment VI. Each 
lot of animals usually consisted of three pigs. The pigs in all the lots 
for any one year were of uniform age, size, and breeding. But, unfor¬ 
tunately, the age of the pigs was not the same in different experiments. 
All were Duroc-Jerseys. The pigs were fed in individual stalls, and the 
pens were so constructed that those in the different lots had no access 
to foreign material. The amount consumed by each pig was carefully 
controlled and recorded. There were six experiments in all, one each 
year. The first one was of preliminary nature, and no data from this 
experiment are used in this and following papers. The data are taken 
only from pigs on which slaughter tests were made. 
DESCRIPTION OF SUPPLEMENTARY FEEDS USED 
Bone ash.— This was ordinary commercial bone ash. 
Synthetic ash.— This mixture was prepared according to Mendel’s 
formula, except that magnesium citrate was omitted and calcium car¬ 
bonate added. 
Calcium phosphate (tertiary).. „ 10 parts; sodium citrate_ 15 parts. 
Potassium phosphate (secondary). 37 parts; sodium tartrate... 8 parts. 
Sodium chlorid. 20 parts; ferric citrate. 2 parts. 
Calcium carbonate. 92 parts. 
