414 



out the exi)eriinent so regulated as to contain 0.53 to 0.54 pound of albu- 

 minoids and amides, and 3.33 to 3.36 pounds of carbohydrates and fats 

 for each 100 pounds of live weight, and was calculated at the begiuniug 

 of each week " not on the actual weight at the commencement of the 

 week, but upon an estimate of what each lot would weigh at the end of 

 the week. * * * As a matter of fact, therefore, the quantity of food 

 was always figured for a greater weight than actually existed." The 

 daily amount of food given and water drank, gain in live weight, cost 

 of gain per pound (allowing 25 cents per 100 pounds for skim-milk, $20 

 per ton for corn meal, and $26 for middlings), digestible dry matter 

 consumed per 100 pounds of increase in live weight for each lot by 

 periods, and the average cost per pound of growth for each lot on each 

 of the two rations, are given in tables. 



The following brief summary gives the averages for the 133 days of 

 the trial : 



Gain per week, cost per pound of gain, and dry matter consumed. 



It is at once seen that the rate of gain is unmistakably greater on tlie skim-milk and 

 grain than on the grain alone, * * » -while the cost of growth in lots 1 and 2 is 

 1.2 cents and 1.9 cents greater per pound when the food was mixed grain. On grain 

 alone there was a loss of more than 1 cent for every pound of growth. * » * The 

 cost of growth and the amount of food required to produce 100 pounds of growth 

 increase as the pigs grow older, and it would have been much more proiitable to have 

 sold them when averaging 175 pounds each than when averaging 240 pounds. 



A calculation of the money value of the skim-milk made "by deter- 

 mining the value of the gain for each skim-milk period and subtracting 

 therefrom the cost of the corn meal which was fed with the 

 skim-milk," indicates that "with thrifty pigs from 20 to 30 cents per 

 hundred ought to be and can be realized for skim-milk wiien live hogs 

 sell at 4 cents per pound. It must be constantly kept in mind, however, 

 that they must be sold by the time they reach a live weight of from 

 200 to 230 pounds." 



Determination of the digestibility of rations, F. W. Morse, 

 B. S. (pp. 11-13).— For the purpose of determining the comparative 

 digestibility of the two rations, one pig was fed on the skim-milk and 

 corn -meal ration (1 part by weight of corn meal to 1.83 parts of skim- 

 milk), and another pig on the mixed-grain ration (equal parts of corn 

 meal and middlings), the excrement being collected for seven days in 

 each case. The average composition of the excrement from each i)ig, 

 the amounts of each constituent of the two rations consumed, voided, 



