ANIMAL PRODUCTION. 271 



•'I'Lo margin botweeu buying and selling prices necessary to insure a profit 

 increases with tlie age of the cattle. . . . 



" The amount of pork purchasetl from the droppings increased with the age 

 of the cattle. . . . 



"The profit per dollar invested in cattle, hogs, and feeds for 6 months was 

 12.5 cts. in feeding calves, 13.7 cts. in feeding yearlings, and 12.5 cts. in feeding 

 two-year-olds. . . . 



"A greater margin is necessary to insure a profit from feeding a period of ISO 

 days than from one of 120 days. 



" The margin necessary to prevent loss on short-fed cattle was .$1.41 per hun- 

 dred ; on long-fed cattle, $2.07 per hundred." 



" The addition of corn silage to a ration of shelled corn, cotton-seed meal, and 

 clover hay resulted in a more rapid and cheaper gain and a higher finish on 

 the cattle." 



Dairy by-products as supplements to corn for fattening hogs, J. H. Skin- 

 ner and W. A. Cochel {Indiana Hta. Bui. 137, pp. 51-72). — This is a continua- 

 tion of a series of experiments undertaken to determine the value of various 

 supplements to corn in pork production (E. S. R., 17, p. 387; 20. p. 369). Its 

 object was to determine the value of skim milk and buttermilk as supplements, 

 and to compare dairy by-products with home-grown and commercial nitrogenous 

 concentrates. 



The feeds used were shelled corn, corn meal, skim milk, buttermilk, mid- 

 dlings, tankage, linseetl oil meal, soy bean meal and rape. In 1906, 5 pigs 

 weighing 6S lbs. each, kept on a ration of shelled corn and skim milk for 90 

 days, made an average daily gain of 1.22 lbs. per head and required 2.53 lbs. 

 of shelletl corn for each pound of gain. Another lot on shelled corn and rape 

 pasture made an average daily gain of O.Sl lb. per head and required 3.97 lbs. 

 corn for each pound of gain. The experiment was repeated in 1907 with 6 

 pigs in each lot, and fed for 50 days. Those receiving the skim milk made an 

 average daily gain of 1.57 lbs. per head and required 3.08 lbs. of shelled corn 

 in addition to make 1 lb. of gain. The lot which was on rape pasture made a 

 corresponding gain of 0.97 lb. per head and required 4.5 lbs. of shelled corn 

 for each pound (»f gain. 



In comparing supplements to corn meal 5 lots of 5 pigs each, weighing about 

 113 lbs. each, were fed for 60 days. The average daily gains per head were 

 as follows: On corn meal and linseed meal 8: 1 1.75 lbs. at a cost of 3.63 cts. 

 l\ev pound ; on corn meal and soy bean meal 7 : 1 1.82 lbs. at a cost of 3.57 cts. 

 per pound; on corn meal and tankage 15: 1 1.83 lbs. at a cost of 3.71 cts. per 

 pound ; on corn meal and middlings 1 : 1 1.97 lbs. at a cost of 3.88 cts. per 

 pound ; and on corn meal and skim milk 1 : 1.5 2.02 lbs. at a cost of 3.56 cts. per 

 pound. In calculating the cost the different feeds were estimated as follows : 

 Corn meal $18, linseed meal $30, soy bean meal $30, tankage $40, and middlings 

 $25 per ton, and skim milk 20 cts. per hundredweight. In the lot where corn meal 

 and tankage were fed, there was a greater amount of corn used in proportion 

 to other feeds than in any other lot, and where corn meal and middlings were 

 used, the proportion of corn was smallest. The smallest amount of dry matter 

 necessary to produce a pound of pork was in the lot fed on corn meal and 

 skim milk, and the greatest amount was in the lot fed corn meal and tankage. 



In another test of supplements to corn, 3 lots of 6 pigs, weighing about 105 

 lbs., each were fed for 60 days and made the following average daily gains per 

 head: Corn meal and skim milk 1: 1.5 1.76 lbs. at a cost of 4.6 cts. per pound; 

 corn and linseed meals 8 : 1 0.98 lbs. at a cost of 6.36 cts. per pound : and corn 

 /ind soy beau meals 8 : 1 0.9 lb. at a cost of 6.16 cts. per pound. The prices of 

 25493— No. 3—10 6 



