juuei. 1920 Variation of Individual Pigs in Economy of Gain 229 



3 pigs showing a variation from the mean of more than 20 per cent. 

 3 pigs showing a variation from the mean of between 15 and 20 per cent. 

 3 pigs showing a variation from the mean of between 10 and 15 per cent. 

 5 pigs showing a variation from the mean of between 5 and 10 per cent. 

 2 pigs showing a variation from the mean of less than 5 per cent. 



The occurrence and scope of variation are further emphasized by Table 

 VIII in which the extremes from 1 1 litters are compared. 



Table VIII. — Extremes of daily gain and weight of grain required to produce 100 pounds 



gain in 11 litters. 



Litter. 



I. .. 

 I. .. 



2. .. 

 2. .. 



PD 

 PD 



DJ. 

 DJ. 



DJ. 

 DJ. 



PY 

 PY 



DJ. 

 DJ. 



PC. 

 PC. 



PC. 

 PC. 



DJ. 

 DJ. 



DJ. 

 DJ. 



Pig No. 



30 

 36 



38 

 43 



Daily gain. 



Pounds 

 2 



I 



I 



Grain for 100 

 pounds gain. 



Pounds. 



423. 04 



430. 76 

 355-31 



325-00 

 364. 10 



455- 20 

 382. 30 



361. 70 

 406. 10 



386. 25 

 320. 94 



370- 85 

 419. 12 



309-78 

 394- 50 



451- 73 

 309-93 



396. 15 

 327.81 



461. 51. 

 308. 81 



Of the 65 pigs an unexpectedly large number show marked variation 

 from the normal or mean grain requirement per unit of gain. 

 Summing up all groups, we find : 



22 pigs showing a variation from the mean of more than 10 per cent. 

 19 pigs showing a variation from the mean of between 5 and 10 per cent. 

 . 22 pigs showing a variation from the mean of less than 5 per cent. 



On a percentage basis: 



34.92 per cent exceeded 10 per cent variation. 



30.15 per cent showed between 5 and 10 per cent variation. 



34.92 per cent showed less than 5 per cent variation. 



