364 The Feeding of Animals 



liquid food is largely eaten. In other words, dairy 

 wastes are not o\\\y efficient in themselves in producing 

 growth, but in proper combination they cause a saving 

 of the grain products necessary to secure a given ratio 

 of gain. Henry states, on the basis of eight feeding 

 trials involving the use of ninety pigs, that 462 lbs. 

 of skimmed milk effected a saving of 100 lbs. of corn 

 meal. This means that 46.2 lbs. of digestible milk 

 solids, when combined with corn meal, saved, approxi- 

 mately, 76 lbs. of digestible corn meal substance. 



Henry's experiments were arranged so as to gain 

 information as to the most desirable proportion of 

 milk and meal, and from his data the writer has cal- 

 culated the quantity of digestible nutrients required in 

 each combination for one pound of growth: 



Digestible matter required 

 for 1 lb. of gain 

 Combination lbs. 



Mixed grains alone 3.9 



1 lb. corn meal to 1-3 lbs. skim-milk 3. 



1 '' " " 3-5 '* " 3.1 



1 " " '' 5-7 " " 3.3 



1 " " " 7-9 " " 3.2 



These results show the greatest food efficiency with 

 the minimum proportion of skim -milk. Other experi- 

 ments, notably those by Linfield and Robertson, give 

 similar testimony. With the former, in seven experi- 

 ments, a milk and grain ration produced 1 lb. of gain 

 for each 2.58 lbs. of digestible matter, the requirement 

 with milk alone being 2.85 lbs. and with grain alone 

 3.19 lbs. When 2 lbs. of skim -milk was fed with 

 1 lb. of grain, 100 lbs. of the milk replaced 31 lbs. 



