144 Pork Production 



the saving of this quantity of corn and supplement by 

 the forage eaten effected a saving in the actual cost of 

 producing a given gain may be considered more profitably 

 in the light of the figures given in the last two spaces of 

 the summary table. 



An acre of forage in these experiments must be given 

 credit for producing an average of 266.77 pounds of pork, 

 or in effecting a saving of 1102.42 pounds of grain or 

 concentrates. The pork credited to each acre of forage 

 was determined from the original data by the following 

 method : The total pounds of concentrates fed the 

 forage lot was divided by the number of pounds of con- 

 centrates required to produce one pound of gain in the 

 dry lot. This gave the number of pounds of pork which 

 would have been produced in dry-lot feeding from the 

 concentrates actually fed in the forage lot. Then by 

 subtracting from the total gains made on forage the 

 calculated gains which would have been made in the dry 

 lot from the same concentrates, we get the gains which 

 must be credited the forage eaten. In other words, from 

 the same quantity of concentrates, pigs fed on one acre 

 of forage would have produced 266.77 pounds more pork 

 than those fed in the dry lot. The concentrates saved 

 by an acre of forage was calculated by multiplying the 

 number of pounds of pork credited to each acre of forage 

 by the pounds of feed required to produce one pound of 

 gain in the dry lot. To produce a gain of 266.77 pounds 

 in the dry lot, there would be required, according to these 

 figures, 1102.42 pounds of concentrates. 



As a means of reducing the cost of producing gains in 

 growing pigs during the summer, therefore, the average 

 acre of the above forage crops had values as shown in the 

 following table ; 



