EFFECTS OF INBREEDING AND CROSSBREEDING. 



51 



Table 16. — Percentage raised to 3S days of the young horn alive. 



[Average in litters of each size, the combined average, and the index (see Table 15). Inbreeding and cross- 

 breeding experiments, 1916-1919.] 



Experiment. 



Size of litter. 



Total. 



Index. 



1 



2 



3 



4 



5 



6 



7 



2 



81.7 

 78.4 

 84.6 

 80.0 

 76.5 

 70.4 



83.7 

 76.6 

 74.0 

 79.5 

 74.7 

 70.9 



79.9 

 72.2 

 63.9 

 78.0 

 61.3 

 53.9 



62.8 

 67.4 

 47.7 

 71.3 

 39.0 

 63.8 



0.0 

 55.2 







79.3 

 72.5 



68.7 

 76.4 

 62.6 

 63.5 



79.4 



13 







74.0 



32 







68.2 



35 



36.8 

 55.6 

 45.5 







78.0 



39 









65.4 



Other 



63.6 











Inbred 



77.6 

 88.6 

 96.3 

 92.9 

 91.7 

 88.9 

 100.0 

 75.0 

 85.2 



76.8 

 88.0 

 92.9 

 92.1 

 86.6 

 85.4 

 87.5 

 89.6 

 88.7 



68.9 

 83.1 

 89.9 

 91.7 

 85.0 

 79.0 

 86.7 

 86.9 

 86.7 



62.2 

 76.7 

 89.2 

 86.8 

 69.7 

 77.8 

 61.8 

 90.2 

 80.2 



46.5 

 51.7 

 96.0 

 76.9 

 37.5 

 57.1 

 44.4 

 90.9 

 66.7 









71.2 

 84.0 

 91.6 

 86.1 

 79.6 

 79.9 

 80.1 

 87.5 

 82.9 



72.1 



CO 



84.8 



CA 







91.7 



AC 



60.0 

 66.7 





91.4 



CC 



84.5 



CI 



82.5 



C2 







85.5 



CL 



84.2 

 60.0 





86.8 



CG 



86.4 







B 



83.8 



86.3 



82.7 



79.8 



67.1 



50.0 





81.6 



83.8 







Table 17. — Percentage raised to S3 days of all young, horn dead or alive. 



[Average in litters of each size, the combined average, and the index (see Table 15). Inbreeding and cross- 

 breeding experiments, 1916-1919.] 



Experiment. 







Size of litter. 





Total. 



Index. 



1 



2 



3 



4 



5 



6 



7 



2 



56.3 

 64.4 

 73.3 

 .56.2 

 66.7 

 58.0 



66.0 

 62.6 

 66.7 

 71.3 

 64.2 

 56.9 



61.9 

 56.1 

 48.7 

 61.4 

 49.7 

 40.7 



42.2 

 43.9 

 29.2 

 45.0 

 23.5 

 34.1 





 26.7 





 15.6 

 50.0 

 14.3 







59.8 

 52.7 

 54.3 



58.2 

 50.0 

 46.5 



53.6 

 65.3 

 76.8 

 76.2 

 66.9 

 68.0 

 68.7 

 73.8 

 66.6 



60.3 



13 









58.0 



32 



56.1 



35 







62.4 



39 









54.0 



Other 



48.1 











Inbred 



61.1 

 75.4 

 83.9 

 68.4 

 78.6 

 80.0 

 92.3 

 71.4 

 71.9 



63.8 

 76.6 

 80.7 

 85.4 

 74.6 

 79.9 

 79.0 

 86.2 

 79.7 



53.3 

 62.8 

 77.5 

 83.6 

 76.0 

 67.1 

 68.4 

 80.3 

 77.4 



38.2 

 48.5 

 71.7 

 78.4 

 54.3 

 62.8 

 52.5 

 62.5 

 59.1 



20.0 

 27.3 

 68.6 

 66.7 

 26.7 

 40.0 

 40.0 

 66.7 

 40.0 









56.3 



CO 



67.8 



CA 







78.8 



AC 



43.7 

 33.3 





81.7 



CC 



73.1 



CI 



73.0 



C2 







73.4 



CL... . 



53.3 

 37.5 





79.2 



CG 



75.3 







B 



70.4 



78.5 



70.6 



64.7 



54.3 



26.2 







68.7 



72.8 







