1918] ANIMAL PRODUCTION. 475 



In the eighth experiment pigs averaging 79 lbs. were used in five lots of five 

 each in comparing corn and skim milk alone and in combination, and corn and 

 tankage. The experiment lasted 15 weeks. Rations of corn alone and skim 

 milk alone gave poor results compared with a combination of the two feeds. 

 The pigs fed skim milk alone made fair gains but did not fatten. They con- 

 sumed daily an average of 36.7 lbs. of skim milk each and gained over 1 lb. 

 per day. With a ration of skim milk and corn in equal parts compared with 

 corn alone, 3.37 lbs. of the former replaced 1.37 lbs. of the hitter. With skim 

 milk as the supplement to corn, less nutrients were needed per pound of gain 

 than when tankage was the supplement. With tankage, however, the rate 

 of gain was higher. 



The ninth experiment was made to secure further data on the u.se of varying 

 proportions of corn and skim milk for fattening pigs. Seven lots of five pigs 

 each were employed, of which five lots were fed corn and skim milk in different 

 proportions, one corn alone, and one corn and tankage. The initial weight of 

 the pigs averaged 43.6 lbs. and the experiment lasted 15 weeks. The lot fed 

 corn alone made a very poor showing, averaging 0.35 lb. daily gain per head 

 at a cost of 6.85 lbs. of feed per pound of gain. The lot on corn and tankage, 

 9 : 1, made a lower rate of gain than any of the lots on a corn and skim milk 

 ration. With corn and skim milk in equal parts, and corn and tankage, 9 : 1, 

 less dry matter of the skim milk than of the tankage was required per pound 

 of gain. As the proportion of skim milk to corn increased above 50 per cent in 

 the ration there was a decrease in its replacement value. Where the pigs were 

 fed corn and skim milk ad libitum, the ratio of milk to corn increased for the 

 first five weeks and gradually decreased from the seventh to the fifteenth 

 week. The pigs consumed an average of 20.5 lbs. of milk daily or an average 

 of 6.4 lbs. of milk to 1 lb. of corn. Their rate of gain was higher than that 

 of those receiving less milk, while the aiuount of total nutrients required per 

 pound of gain was lower. 



Some conclusions from the results of all the experiments noted are indicated. 

 While further experiments are necessary to determine the best proportion of 

 tankage to feed to pigs, it appears that where as much as 10 per cent is given 

 there is no advantage in feeding a larger proportion in the earlier than in the 

 later period of the test, but where the tankage is 5 per cent of the ration it 

 is advisable to feed a larger proportion in the beginning. 



The results indicate that as a supplement to corn skim milk has an advan- 

 tage over tankage, especially for young pigs. There is believed to be no one 

 best supplementary feed to corn nor one best ratio in which to feed it. There 

 must be taken into consideration the age of the pigs, the market price when 

 finished, and the prevailing prices of corn and available supplements. 



The self-feeder for hog's, F. G. Ashbrook and R. E. Gonuweu {U. S. Dcpt. 

 Agr., Farmers' Bui. 906 (1917), pp. 12, figs. 9). — In an experiment made at the 

 Department Experiment Farm at Beltsville, Md., two lots of nine pigs each 

 were fed by hand and self-feeder for 70 days on corn meal, middlings, and tank- 

 age. The hand-fed lot made an average daily gain of 1.04 lbs. per head at 

 the rate of 4.1 lbs. of feed per pound of gain. The lot self-fed made a correspond- 

 ing gain of 1.62 lbs. with a food consumption of 4.06 lbs. of feed. 



In another experiment lasting 28 days, five pigs on rye pasture, corn meal, 

 and tankage, self-fed, made an average daily gain of 1.61 lbs. per head using 

 3.63 lbs. of feed per pound of gain. The corresponding gains for five pigs on rye 

 pasture, shelled corn, and tankage, self-fed, were 1 53 lbs. with a consumption 

 of 3.32 lbs. feed, and for a third lot of five on rape pasture, corn meal, mid- 

 dlings, and tankage, 5:4:1, hand-fed, 1.48 lbs. with a consumption of 3.69 lbs. 

 of feed. 



