EXPERIMENT STATION P.ULT.ETINS. 



513 



Thus pigs under 100 pounds weight, wlieu led cereal grains aloiir, re 

 quired 4G8.9 pounds grain per 100 pounds of gain, wliile on a ration of 

 skim milk and grain, 257 pounds of grain and 750.1 ])ounds of skim milk 

 produced 100 pounds of gain. Therefore 750.4 pounds of skim milk replaced 

 211.9 pounds grain, or 100 pounds skim milk replaced 28.2 pounds grain. 

 With the older and heavier weight pigs, 100 pounds skim milk replaced 

 24.9 pounds grain. Hence, in these comparisons, skim milk showed 13.2% 

 greater value when used to supplement grain in the ration of the young 

 growing pig than with the more mature and heavier weight hogs. 



PROPORTION OF MILK TO GRAIX. 



Another factor influencing the value of skim milk as a supplement to 

 grain is the proportion of milk to grain in the ration used. It is gen- 

 erally conceded that skim milk will give greatest returns as a supple- 

 ment to cereal grains when not more than three pounds milk are fed i)or 

 pound of grain. An examinaticm of the ahove numtioned experiments 

 on this point is interesting. All the feeding trials were divided into two 

 groups, placing in one group all those in which the proportion of milk 

 to grain in the ration was not more than three to one, and placing in 

 tlie other group all those in which the ration consisted of more than three 

 pounds milk to one pound of grain. 



The group which received the ration.s in which the proportion was not 

 more than three pounds ."-skim milk to one pound grain, averaging less 

 than 2 to 1. showed a saving of 38 pounds grain per 100 pounds milk fed 

 while those fed a larger proportion of milk to grain, averaging 5.0 pounds 

 skim milk to one pound grain, showed a saving of only 20.5 pounds grain 

 per 100 pounds milk consumed. Hence, in the first group, where less than 

 two pounds of milk was fed per pound of grain consumed, skim milk 

 showed 85.3% higher feeding value than in the second group when nearly 

 six pounds of milk was fed per pound of grain consumed. This is a matter 

 of considei-able importance when the supply of skim milk is limited or 

 must be purchased but would be of no practical significance when large 

 quantities were available. 



COMPARATIVE VALTE OF SKIM .MILK AXn OTHER XITROCEXOl'S FEEDS. 



The above figures give the value of skim milk as a supidement to corn 

 and other cereal grains and indicate that when this by-product of the 

 dairy is available it can be combined to excellent advantage with the 

 farm grown grains for pig feeding. ^A'lien skim milk is not available, as 

 on the farm where Avhole milk is sold for the retail trade or for condensiiiff 



