304 PRODUCTIVE FEEDING OF FARM ANIMALS 



when fed with grain feed, such as corn meal and barley or shorts, 

 will save 100 pounds of grain in feeding fattening pigs, and that 

 two pounds of whey are worth about as much as one pound of 

 skim milk or buttermilk in feeding swine (p. 209). Canadian 

 experiments have shown no appreciable difference in the feeding 

 value of sweet and sour whey, but whey run through a separator or 

 from separator skim milk is worth only 75 to 80 per cent as much as 

 common whey obtained in the manufacture of American cheddar 

 cheese. 12 



Pastures. As with other farm animals, swine will make the 

 cheapest gains when grazing or harvesting their own feed (Figs. 

 79 and 80) ; pasture only, without any supplementary grain feed, 

 will not, however, produce satisfac+orv gains, whether this con- 

 sists of mixed grasses, clover, or alfalfa. In trials at the Utah 



FIG. 80. Making pork on blue grass. The average returns for four years on this pasture 

 were $15.18 per acre. (Missouri Station.) 



station 13 pigs weighing 60 to 75 pounds when on pasture (alfalfa 

 and mixed grasses, chiefly the former) gained only 0.2 pound daily; 

 pigs receiving one-half grain ration when on pasture gained 0.7 

 pound; and those receiving a full grain ration gained 1.2 pounds 

 daily. The pasturage saved about 15 per cent in the amount of 

 grain required for the production of 100 pounds gain. The 

 practice of feeding pastured pigs small grain rations is an econom- 



12 Ontario Reports, 1897 and 1909; Wisconsin Report 8, p. 47. 

 "Bulletin 94. 



