612 FEEDS AND FEEDING 



In other trials 20 where pigs have been fed limited rations in summer in 

 comparison with others full-fed on concentrates, but in which the limited- 

 fed pigs have not been carried to the same market weights, considerably 

 more feed has been required per 100 Ibs. gain by the full-fed pigs than 

 by the others. As has been pointed out, this was because the limited-fed 

 pigs were not yet well fattened. 



Where the pasture is unusually good, as in the irrigated districts of 

 the West, pigs may make the most economical gains if the grain allowance 

 is limited. The following table summarizes the results of trials during 2 

 years by Arnett and Joseph at the Montana Station 21 in which 33-lb. 

 pigs were fed various amounts of barley and tankage on irrigated pasture 

 in summer. All lots were then full fed to a weight of 200 Ibs. 

 Various amounts of barley for pigs on pasture 



Daily Time to Concentrates 



Daily concentrate allowance gain reach for 100 Ibs. 



during summer 200 Ibs. gain 



Lbs. Lbs. Lbs. 



1 lb. concentrates per 100 Ibs. live wt 0. 84 201 354 



2 Ibs. concentrates per 100 Ibs. live wt 0. 88 195 369 



3 Ibs. concentrates per 100 Ibs. live wt 0. 94 182 374 



Concentrates self-fed 1.02 170 400 



In these trials the pigs fed only 1 lb. concentrates daily per 100 Ibs. 

 live weight during the summer and then full-fed in the fall took 201 days 

 to reach the weight of 200 Ibs. 41 days longer than the self -fed pigs. 

 However, the self-fed pigs required 46 Ibs. more concentrates per 100 

 Ibs. gain. 



925. Factors determining economy of full-feeding. From all the Ex- 

 periments which have been carried on, we may conclude that it is general- 

 ly most profitable in the corn belt and eastward to full-feed early spring 

 pigs on pasture so they may be marketed in September or October before 

 the slump in prices occurs. The advisability of this practice is shown by 

 the following table which gives the average monthly receipts of hogs 

 at the Chicago markets and the average price received per cwt. live 

 weight for the 21-year period, 1901 to 1921, inclusive: 22 



Monthly receipts and average prices of hogs at Chicago 



Chicago Average price 



receipts per cwt. live wt. 



Head Dollars 



January 888,000 8. 17 



February 759,000 8. 43 



March . 646,000 9. 04 



April.. 531,000 9.16 



May.. 605,000 9.00 



June 603,000 8.83 



July 552,000 9. 28 



August 484,000 9. 27 



September 423,000 9.36 



October 535,000 8.75 



November 701,000 8.23 



December 858,000 8.00 



^Evvard, Iowa Bui. 136; Robison, Ohio Bui. 343; Waters, Kinzer, and Wright, 

 Kan. Bui. 192. 



^Mont. Bui. 128. ^Wentworth, Progressive Hog Raising, p. 58. 



