Da/nish Pig-feeding EoDperiments. 



585 



weeks. Barley, oats, corn and peanut meal were fed separately 

 or combined; in all cases more or less skim milk was given in 

 addition to tlie grain. The pigs were all less tlian 12 weeks old, 

 averaging 6 weeks, and weighing less than 40 pounds at the begin- 

 ning of the trials. The feed consumed and the average gain 

 are shown below: 



Gain of pigs fed gravity and separator skim milk with grain — Copen- 

 hagen Station. 



Gravity skim 

 milk. 



Centrifugal 

 skim milk. 



Average daily gain per head 



Difference in favor of gravity skinuning. 

 Per cent, of fat Ln skim milk 



.776 lbs. 



.035 lbs. 



.63 per cent. 



.741 lbs. 



. 15 per cent. 



The pigs in these ti-ials were fed about 8 pounds of mUk a day 

 on the average. Of gravity skim milk 100 pounds produced a lit- 

 tle over .4 pounds more gain in live weight than the same quantity 

 of centrifugal skim milk. The pigs fed gravity skim milk gained 

 as much in 23 days as the others in 24 days. Allowing a fair 

 value for the butter fat, centrifuging the milk is shown to be the 

 more profitable method. (357, 659, 869-71) 



887. Skim milk compared with whey. — The relative value of 

 separator skim milk and whey left in the manufacture of skim 

 cheese from separator skim mUk was studied i in experiments 

 conducted during 1885-87. In one series, where three pounds of 

 whey were fed against one pound of skim milk, the weight of 

 the pigs fed varied from 79 to 110 pounds. These trials included 

 34 animals, the feeding lasting from 53 to 60 days. There was a 

 daily gain of .91 pounds for the lots fed skim milk and 1.22 pounds 

 for those fed whey. 



Another series of experiments" was conducted on six different 

 farms with 258 animals in all, varying from 28 to 174 pounds each 

 at the beginning of the trials, the feeding periods running from 

 50 to 160 days. In this series, which included nineteen trials, 

 two pounds of whey were fed against one pound of separator 



» Kept. 1887. 

 « Eept 10, p. 26. 



