junei,i92o Variation of Individual Pigs in Economy of Gain 231 



Table XIII. — Rank of pigs of test C, group I, in rate and economy of gain 



Table XIV. — Rank of pigs of test C, group 2, in rate and economy of gain 



Table XV. — Rank of pigs of test C, group j, in rate and economy of gain 



Selecting approximately the top half of each group, on the basis of 

 rate of gain, we have 4 top pigs from test A; 3 from test B, group i; 



3 from test B, group 2; 6 from test B, group 3; 3 from test C, group i; 



4 from test C, group 2 ; and 8 from test C, group i ; making a total of 31 

 pigs. Of this number 19 were placed in the corresponding top halves of 



. their respective economy columns. 



In other words, slightly more than 60 per cent of the fastest-growing 

 pigs were also distinctly economical producers. This would indicate 

 that slightly more than one-half of the fastest-growing pigs in an aver- 

 age group would qualify on an economy basis. 



The foregoing comparison is independent of litter relationships. Se- 

 lecting and comparing the fastest-growing pig with the slowest-gainer 

 from the same litter, we find the following results from 1 2 litters : 



In 6 cases the fastest growing pig was most economical. 

 In 3 cases the fastest growing pig was least economical. 



