FEEDING BV-PRODUCTS 395 



pings from the cattle. An experiment on this Hne con- 

 (hicted at the Ohio experiment station (Circular No. y2>) 

 showed that hogs which received one-third pound of 

 tankage daily per head, made gains 52.22 per cent larger 

 than those dependent solely upon the droppings. Six 

 lots of steers were fed upon two different rations. There 

 were seven head in each lot, and three lots were fed upon 

 each ration. One ration consisted of shelled corn, cot- 

 tonseed meal, corn stover, corn silage, and mixed hay. 

 The other was shelled corn, cottonseed meal, corn stover, 

 and mixed hay. At the end of 63 days the three hogs 

 which had been placed with each lot of cattle were re- 

 placed by thinner hogs, four to each lot. All lots of 

 hogs were supplied with a mixture of ashes and salt, but 

 no other food save the droppings except the tankage. 

 It was noticeable that the hogs fed on tankage had less 

 desire for ashes and salt than the other lots. The gains 

 made through the addition of tankage were not only 

 much larger, but were found to be cheaper, with tank- 

 age figured at $37.60 a ton. A comparison of gains is 

 shown in the table on tlie next page. 



The Ohio experiment led to the following general ob- 

 servation regarding supplements to the feed of hogs fol- 

 lowing fattening cattle (Circular No. yT^) : "While, on 

 account of its cheapness as a carrier of protein and "a.sh 

 and convenience for feeding, tankage was used in the 

 work reported herein, it is believed that other feeds, such 

 as linseed-oil meal, soy beans, skim milk, buttermilk, or 

 middlings, would greatly increase the efficiency of the 

 'cattle hog' in making economical gains. Feeders need, 

 however, lo exercise keen discrimination in the pnrcliase 



