EFFECTS OF INBREEDING AND CROSSBREEDING. 



Table 15. — The -percentage horn alive. Control stock by years, 1911 to 1920. 

 [The average in each size of litter and the index, as in Table 7.] 



35 





Size of litter. 







Size of litter. 





Year. 





In- 

 dex. 



Year. 





In- 



























dex. 





1 



2 



3 



4 



5 



6 







1 



2 



3 



4 



5 



6 





1911.. 



100.0 



87.5 



SI. 3 



87.5 



86.7 



91.7 



86.3 



1916.. 



90.0 



92.0 



88.5 



73.8 



80.0 



16.7 



86.8 



1912.. 



81.8 



90.3 



92.4 



96.9 



91.4 



77.8 



91.6 



1917.. 



72.7 



91.2 



84.2 



84.4 



90.0 





85.2 



1913.. 



87.5 



87.8 



92.9 



86.8 



88.9 



63.3 



89.6 



1918. . 



85.7 



87.5 



79.8 



79.4 



40.0 





82.6 



1914.. 



82.3 



86.3 



93.3 



86.9 



85.6 



81.2 



88.8 



1919.. 



90.9 



92.7 



87.7 



87.5 



83.6 



83.3 



89.5 



1915. . 



73.7 



87.1 



92.5 



92.8 



84.6 



50.0 



89.1 



1920.. 



78.3 



88.6 



84.7 



81.6 



85.4 



70.8 



84.6 



Table 16. — The percentage raised to 33 days of the young born alive. Control stock by 



years, 1911 to 1920. 



[The average in each size of litter and the index, as in Table 7.] 



Year. 



Size of litter. 



In- 

 dex. 



Year. 



Size of litter. 



In- 



1 



2 



3 



4 



5 



6 



1 



2 



3 



4 



5 



6 



dex. 



1911.. 

 1912.. 

 1913.. 



66.7 



88.9 

 85.7 

 85.7 

 64.3 



91.4 



92.8 

 81.5 

 94.3 

 87.0 



92.0 



89.7 

 85.3 

 90.9 

 89.2 



75.0 

 83.9 

 57.6 



84.2 

 88.7 



87.2 

 100.0 

 75.0 

 93.5 



78.2 



72.7 

 82.2 

 68.4 

 79.5 

 66.7 



85.9 

 89.4 

 78.7 

 90.0 

 86.0 



1916.. 

 1917.. 

 1918.. 

 1919. . 

 1920.. 



83.3 



87.5 

 87.5 

 70.0 

 88.9 



86.4 

 86.0 

 84.3 

 88.2 

 93.5 



82.4 

 78.5 

 84.5 

 86.8 

 9L3 



77.4 

 75.3 

 85.2 

 83.9 

 80.2 



42.9 



77.8 



100.0 



82.7 

 8L0 

 84.9 



1914.. 

 1915.. 



82.6 

 66.0 



45.0 

 52.9 



85.0 

 89.5 



Table 17. — The percentage raised to 33 days of all young horn. Control stock by years, 



1911 to 1920. 



[The average in each size of litter and the index, as in Table 7.] 



Year. 



Size of litter. 



In- 

 dex. 



Year. 



Size of litter. 



In- 



1 



2 



3 



4 



5 



6 



1 



2 



3 



4 



5 



6 



dex. 



1911.. 

 1912. . 

 1913.. 

 1914.. 

 1915.. 



66.7 

 72.7 

 75.0 

 70.6 

 ^7.4 



80.0 

 83.9 

 71.6 

 81.4 

 75.8 



74.8 

 82.9 

 79.3 

 84.8 

 82.5 



65.6 

 81.2 

 50.0 

 73.2 



82.2 



75.6 

 91.4 

 66.7 

 80.0 

 66.2 



66.7 

 63.9 

 43.3 

 64.6 

 33.3 



73.7 

 81.9 

 70.5 

 79.9 

 76.6 



1916.. 

 1917.. 

 1918.. 

 1919. . 

 1920.. 



75.0 

 63.6 

 75.0 

 63.6 

 69.6 



79.5 



78.4 

 73.7 

 81.7 

 82.9 



72.9 

 66.1 

 67.4 

 76.1 

 77.3 



57.1 

 63.5 

 67.6 

 73.4 

 65.4 



34.3 

 70.0 

 0.0 

 69.1 



56.4 



16.7 



'37.'5' 

 37.5 



71.8 

 69.0 

 70.1 

 76.0 



75.8 



Table 18. — The average birth weight in grams. Control stock by years, 191'1 to 1920. 

 [The average in each size of litter and the index, as in Table 7.] 





Size of litter. 







Size of litter. 





Year. 





In- 

 dex. 



Year. 





In- 



























dex. 





1 



2 



3 



4 



5 



6 







1 



2 



3 



4 



5 



6 





1911.. 



92.8 



89.8 



77.1 



64.8 



64.3 



57.8 



80.0 



1916. . 



89.2 



85.0 



70.1 



56.8 



48.6 



50.3 



73.8 



1912. . 



115.4 



94.8 



85.9 



72.9 



67.0 



60.0 



88.9 



1917.. 



99.5 



83.4 



69.5 



57.8 



62.5 





74.3 



1913.. 



110.2 



90.6 



81.1 



70.2 



60.5 



53.5 



84.7 



1918.. 



109.5 



85.6 



68.2 



65.8 



48.3 



47.8 



77.1 



1914. . 



105.1 



101.1 



83.6 



73.6 



69.3 



58.9 



89.0 



1919. . 



105.4 



95.3 



80.5 



69.5 



62.2 



58.7 



85.2 



1915. . 



98.2 



94.2 



83.4 



68.7 



61.3 



47.0 



85.2 



1920. . 



118.0 



90.4 



80.8 



69.2 



59.2 



45.8 



85.1 



