INBREEDING IN RELATION TO EGG PRODUCTION 285 



The check pen was superior to the three inbred pens in mean weight of eggs 

 hatched and in hatching weight of chicks. In the percentage of fertile eggs 

 hatched, the check pen surpassed the others. Inbred pen 1 with progeny from 

 half brother-sister matings was superior to any other pen in vigor of chicks. 

 There were three families from this pen with no mortaUty up to September first, 

 while not a single family in the other pens was free from mortality during this 

 period. The fact should be noted that inbred pen 3 where the inbred lines were 

 crossed had a slightly greater chick mortahty than the other pens. 



Progeny weight records for one year show that the pullets descending from the 

 original check group after this group was closely inbred were smaller at first egg 

 than the pullets of the inbred groups. The same situation also existed for both 

 males and females at one year of age. 



The mortaUty rate for pullets in the laying houses was very significantly 

 greater in the check group than in either inbred groups 1 or 3. The daughters 

 from inbred pen 2, largely from sire-on-daughter matings, showed a mortaUty 

 rate somewhat greater than occurred in the check daughters. Possibly on the 

 whole the check daughters were less vigorous than the inbred daughters. 



¥7 



F 525 



C! 418 



•G601 

 G 1627 



F 1449 



~G 1184 



G 1738 

 G 1817 



Check Pen — Inbred 



H 706 

 H2968 



H2091 

 H2476 

 H2951 



H 2151 

 H2687 

 H2688 

 H 2689 

 H 3201 



H 222 

 H 225 

 H 745 

 H 1265 

 H 1268 

 H 1766 

 H 2162 

 H 2163 

 H 2165 



H 2839 

 H3290 

 H 3292 



188 

 204 



199 

 214 

 210 



215 

 196 

 187 

 201 

 200 



177 

 156 

 151 

 179 

 184 

 221 

 165 

 198 

 209 



209 

 193 

 199 



Inbred Pen 1 — Crossed 



103 

 173 



159 

 141 

 160 



131 

 170 

 153 

 188 

 161 



149 

 149 

 136 

 185 

 193 

 225 

 190 

 175 

 132 



168 

 165 

 157 



229 

 211 

 208 

 121 

 215 

 180 

 209 

 219 



215 

 163 

 187 



194 

 209 



158 



