Investigations with Swine. 



551 



for maintenance. In general, then, and until this matter is 

 worked out more fully, we may say tliat a pig requires for its main- 

 tenance two pounds of feed of value equal to middlings for each 

 100 pounds of live weight. 



841. Weight, gain, and feed consumed by pigs. — At many of 

 our Stations records of weights and gains of pigs and feed con- 

 ^ sumed by them have been so reported as to permit of studies con- 

 cerning the influence of increased size and weight of the animal 

 on the consumption of feed. All of the available data from 

 trials of this character conducted in this country up to the time 

 of going to press enter into the composition of the table given 

 below. In compiling this table, six pounds of skim milk or 

 twelve pounds of whey are calculated as equal to one pound of 

 grain, according to the Danish valuation of these articles. For 

 convenience of study, the data are presented for each period cov- 

 ering fifty pounds of growth, the actual average weight of the 

 pigs, however, being given for each division. 



Data relative to feed, weight and gain of pigs — Many American 



Stations. 



In the above table the large number of trials reported for 

 pigs weighing up to 350 pounds each furnishes reliable data. 

 After this point is reached the number of animals is too small to 



