INBREEDING IN RELATION TO EGG PRODUCTION 281 



this experiment a strain of low intensity has been estabUshed. These daughters 

 also exhibited a low degree of broodiness. Even in the check pen broodiness 

 was practically eliminated. The first inbred pen showed 5 daughters high in 

 persistency to 3 low in persistency, and the second inbred pen showed 6 high to 

 4 low. These daughters therefore ran lower in persistency than the first genera- 

 tion of inbred daughters hatched in 1923. The three check daughters of 1926 

 showed improved persistency over 1923 (see Table 14). Annual egg records for 

 the check daughters averaged 174 in 1926 as compared with 149 in 1923. The 

 check group was less variable in annual production, and the inbred pens exhibited 

 no change. In general, it may be said that crossbreeding these inbred strains 

 did not result favorably in 1926. 



Plan of Matings — 1927 



Original check groups were again inbred in 1927. The check pen carried 

 male G 417 from a sire-on-daughter mating and related to his mates. The 

 females in this pen consisted of F 7, a half sister to male G 417 and F 525, his 

 mother. Females G 601 and G 1321 were sired by the father of male G 417 

 mated to a full sister of the mother of male G 417. The other birds in this pen 

 were G 418, G 1351, G 1352, G 1626 and G 1627, all full sisters to male G 417. 

 This pen, therefore, represented a very high degree of inbreeding of the original 

 check groups. 



Inbred pen 1 was made up of eleven females mated to male G 315. This male 

 was not inbred but came from one of the inbred strains. The hens in the pen 

 consisted of C 6127, one of the original sisters in the inbreeding experiment; 

 F 1449, a full sister to the sire of male G 315; three sisters, G 311, G 911 and 

 G 2016, that are also half sisters to male G 315; and six sisters, G 739, G 1183, 

 G 1184, G 1738, G 1739 and G 1817, that are also half sisters to male G 315. 



Inbred pen 2 consisted of ten females mated to male F 433. Male F 433 came 

 from a half brother-sister mating tracing directly to foundation hen C 1124. 

 The females in the pen were: C 1124, double granddam of male F 433; F 1489 

 and F 2147, sisters from son-mother mating but not related to male F 433; five 

 sisters, G 372, G 373, G 764, G 766 and G 768, not inbred but all daughters of 

 male F 433; G 1241 and G 1242, sisters whose mother was a full sister to the 

 dam of the preceding five hens and whose sire was male F 433. 



Inbred pen 3 included seven females all mated to male G 624, a brother to 

 male G 417 from a sire-on-daughter mating. The females consisted of three 

 sisters, G 724, G 1219, and G 1221, also not inbred or related to male G 417; 

 G 1418, neither inbred nor related to male G 417; and two sisters, G 1672 and 

 G1745, not inbred and not related to male G 624. 



