junei, I920 Variation of Individual Pigs in Economy of Gain 227 



Table IV. — Grain required to produce lOO pounds gain in dry-lot pigs of test B, group j 

 [Average initial weight, 29.6 pounds; average final weight, ij7 pounds] 



Litter. 



Pig No. 



Daily gain. 



Grain for 100 

 pounds gain. 



Variations from mean grain for 

 100 pounds gain. 



DJ 



DJ 



r>J 



DJ 



DJ 



DJ 



PD 



PD 



PD 



PD 



DJ 



PY 



Mean grain for 100 

 pounds grain 



Pounds. 

 1.380 

 I. 326 

 1.258 

 I. 198 



1-397 

 I. 040 



1.4=^2 



1.282 

 1.052 

 I- 175 

 1-157 

 I. 177 



Pounds. 

 361.70 

 379. 20 



399- 60 

 392.20 

 406. 10 

 383- 10 

 3(>3- 30 

 392-30 

 378.20 

 431.40 

 358- 70 

 340. 30 



379- 79 



763 



15s 



216 

 267 



927 

 871 



341 

 293 

 418 



589 



553 

 307 



If the three groups are combined, the pigs may be classified as follows 

 on the basis of degree of variation from their respective means : 



6 pigs show a variation from the mean of more than 10 per cent. 



9 pigs show a variation from the mean of between 5 and 10 percent. 



10 pigs show a variation from the mean of less than 5 per cent. 



TEST C 



In 191 7 three tests were conducted. As before, 6 pigs were fed on pas- 

 ture and 9 were carried on individual self-feeders in dry lot. In addition 

 1 6 pure-bred pigs intended for breeding animals were selected for indi- 

 vidual feeding. Of the 15 market pigs 2 were very small at the beginning 

 of the test and much lighter than the others at the close. For that reason 

 they are omitted. The data for the three groups are given in Tables V 

 to VII. 



Table V. — Grain required to produce lOO pounds gain in pasture-Jed pigs of test C, group 



J , fed 118 days 



[Average initial weight, 35.8 pounds; average final weight, 172.84 pounds] 



