INBREEDING IN RELATION TO EGG PRODUCTION 287 



portions were 11 high to 3 low. The mean annual egg record for pen 1 was not 

 satisfactory, largely because of low intensity in more than half of the daughters. 



Inbred pen 2 was made up largely of daughters from father-daughter matings. 

 The character of the mothers of these birds did not differ greatly from the mothers 

 used in pen 1. Table 18 shows the daughters from pen 2 to be somewhat superior 

 to those from pen 1 chiefly in body weight, persistency and annual egg record. 

 Their high mean annual egg record was due largely to the nine daughters of hen 

 F 1589 that averaged 207 eggs. These appear first in Table 18 and are followed 

 by the 12 daughters of F 2147, her full sister. These two dams were both inbred 

 but not related to their inbred mate used in 1927. This type of mating gave 

 significant uniformity in the traits being studied in the daughters of F 1589 but 

 not in the daughters of ler sister F 2147. 



Inbred pen 3 daughters came from dams G 1221 and G 1418. The first six 

 listed were from G 1221. The daughters from these matings did not exhibit 

 uniformity in age at sexual maturity or in body weight. They were superior to 

 the other groups with respect to winter pause. The two families of daughters 

 were about equal in clutch size and in persistency. In annual egg records there 

 was a considerable degree of uniformity. This pen indicates that in two matings 

 out of six the crossing of inbred strains was advantageous. The offspring from 

 other matings was not carried through the year. 



Plan of Matings — 1928 



In 1928 the mating pens consisted of one check pen and three of the original 

 inbred pens. In this concluding year of the experiment it seemed desirable to 

 attempt to discover if any possible mating combinations would be particularly 

 advantageous from the standpoint of high fecundity. The mating pens were 

 made up as follows: 



The check pen contained male G 624, representing a sire-on-daughter mating 

 and traced to the outside "Standard" male C 75411 that was used in the original 

 check matings. The females used were G 418, a full sister to male G 624; G 601, 

 half sister to male G 624 and from a sire-daughter mating; two outbred sisters, 

 G764 and G1331, unrelated to male G 624; G 1218, not inbred and unrelated 

 to male G 624; G 1817, not inbred or related to male G 624; and two sisters, 

 H 224 and H 747, from half brother-sister mating and intimately related to male 

 G 624 through his sire. 



Inbred pen 1 was composed of nine females mated to male G 315. This male 

 was not himself inbred but traced directly to C 1124. The females used were as 

 follows: F 525 from former check group and unrelated to male G 315; hen F 1449, 

 from a half brother-sister mating from C 1124 and distantly related to male 

 G 315 through C 1124; F 1589, representing a sire-on-daughter mating and 

 related to male G 315 whose grandsire is her sire; G 1184, not inbred but a half 

 sister to male G 315; G 1241, a full sister to male G 315; G 1626. from a sire- 

 on-daughter mating but unrelated to male G 315; G 1745, not inbred but almost 

 a full "blood" sister to male G 315; two sisters, H 2687 and H2688, from full 

 brother-sister matings but not related to male G 315. 



Inbred pen 2 was made up of seven females mated to male G 1965. This male 

 came from mating male F 433 that was inbred to hen C 1124, back to hen C 1124. 

 He therefore represents distinct inbreeding to foundation hen C 1124. The 

 females in the pen were two sisters, H 314 and H 602, not inbred but carrying 

 C 1124 in their paternal ancestry and being half sisters to male G 1965; H 2267, 

 coming from a sire-daughter mating both tracing to C 1124, and a half sister to 

 male G 1965; two sisters, H 2774 and H 3192, not inbred but tracing to C 1124 

 on their dam's side and but remotely related to male G 1965 through C 1124: 



