EFFECTS OF INBEEEDING AKi> CROSSBREEDING. 



55 



Table 24. — Number of young horn during successive 3-month periods, 1916-1919. 

 Inbreeding and crossbreeding experiments. 



Experi- 



1916 



1917 



1918 



1919 



Total. 



ments. 



1-3 



4-6 



7-9 



10-12 



1-3 



4-6 



7-9 



10-12 



1-3 



4-6 



7-9 



10-12 



1-3 



4-6 



7-9 



10-12 



2 



13 



32 



35 



39 



Other. . . 



59 

 59 

 44 

 69 

 SO 

 240 



61 

 47 

 31 



48 

 44 

 154 



78 

 90 

 41 

 58 

 41 

 192 



62 

 50 

 35 

 64 

 44 

 163 



47 

 37 

 24 

 41 

 26 

 124 



59 

 18 

 24 

 33 

 26 

 101 



36 

 34 

 17 

 43 

 13 

 80 



47 

 41 

 33 

 41 

 21 

 49 



49 

 24 

 24 

 41 

 13 

 38 



189 

 80 

 19 

 17 

 95 

 91 

 30 

 27 

 49 



46 

 23 

 26 

 39 

 16 

 14 



164 

 63 

 11 

 31 

 68 

 73 

 12 

 18 

 46 



56 

 21 

 28 

 53 

 12 

 8 



67 

 37 

 15 



45 

 4 



7 



100 

 58 

 26 

 54 

 16 



91 

 62 

 43 

 60 

 17 



82 

 79 

 39 

 71 

 12 



58 

 60 

 38 

 73 

 27 



998 

 740 

 488 

 833 

 382 

 1,170 





254 

 68 

 38 

 68 

 34 

 29 

 26 

 50 



105 



273 

 64 

 85 



134 









Inbred . . 

 CO 



521 



385 

 32 



500 

 100 



418 

 118 



299 



140 



4 



261 



137 



7 



1 



51 



53 



5 



223 

 174 

 13 

 5 

 128 

 70 

 11 



232 

 97 

 10 

 26 

 90 

 89 

 18 

 2 

 21 



178 

 56 

 14 

 28 

 57 

 64 

 22 

 25 

 43 



175 

 57 

 30 

 44 

 48 

 66 

 26 

 32 

 49 



283 

 77 

 116 

 102 



256 

 81 

 63 



115 



4,611 

 1,334 



CA 





410 



AC. 











571 



CC 







2 



16 

 22 



28 

 30 



617 



CI 







29 



18 



90 



111 



13 

 12 

 83 

 82 



...„ 



54 



75 



629 



C2 









182 



CL 













381 



CG.. .. 

















581 





















B 



115 



86 



139 



115 



105 



110 



106 



93 



87 



71 



79 



79 



123 



94 



82 



75 



1,559 



Table 25. — Number of young bom alive during successive 3-month periods, 1916-1919. 

 Inbreeding and crossbreeding experiments. 







1916 







1917 







1918 







1919 







Experi- 

































TotaU 



ment. 





































1-3 



4-6 



7-9 



10-12 



1-3 



4-6 



7-9 



10-12 



1-3 



4-6 



7-9 



10-12 



1-3 



4-6 



7-9 



10-12 





2 



29 



49 



56 



42 



25 



39 



26 



43 



42 



34 



44 



59 



79 



71 



67 



48 



753: 



13 



38 



35 



62 



36 



29 



12 



21 



28 



21 



11 



18 



30 



38 



56 



61 



42 



638 



32 



27 



20 



36 



27 



15 



19 



17 



25 



16 



19 



22 



16 



19 



41 



37 



31 



386 



35 



47 



36 



48 



45 



32 



20 



33 



35 



39 



19 



43 



37 



46 



44 



49 



63 



635 



39 



35 



32 



39 



28 



18 



18 



13 



19 



12 



13 



7 



4 



16 



16 



11 



25 



305 



Other. 



166 



108 



134 



136 



87 



74 



72 



40 



22 



13 



8 



7 











867 















•Inbred. . 



332 



280 



375 



314 



206 



182 



182 



190 



152 



109 



142 



162 



196 



228 



226 



209 



3,474 



CO 





22 



77 



71 



92 

 4 



115 



7 



1 



41 



48 



4 



135 

 13 

 5 



102 

 62 

 11 



86 

 8 

 24 

 78 

 78 

 12 

 2 

 20 



67 

 11 

 13 

 77 

 80 

 26 

 16 

 32 



42 

 9 

 20 

 58 

 66 

 11 

 13 

 34 



34 

 12 

 24 

 49 

 52 

 18 

 19 

 28 



47 

 21 

 42 

 46 

 51 

 26 

 30 

 48 



50 

 31 

 65 

 27 

 29 

 24 

 43 

 79 



54 

 72 

 124 



69 

 99 

 92 



76 

 67 

 96 



l,03r 



CA 





344 



AC 











606. 



CC 







2 



13 



17 



26 

 18 



619 



CI 







25 

 15 

 75 

 97 



10 



8 



73 



73 



"'i' 



50 

 56 



536 



C2 









156 



CL 













321 



CG 

















467 















.. - "i-- 





B 



93 



71 



121 



98 



79 



96 



90 



83 



65 



48 



64 



76 



112 



81 



70 



66 



1,313 



