EFFECTS OF INBREEDING AND CROSSBREEDING. 



53 



Table 20. — Average daily rate of gain betioeen birth and weaning {S3 days), in grams. 



Average in litters of each size and the index (see Table 18). Inbreeding and crossbreeding experiments, 



1916-1919.1 



Experiment. 



Size of litter. 



Index. 



1 



2 



1 

 3 1 4 



5 



6 



7 



2 



3.58 

 5.06 

 4.32 

 4.98 

 4.31 

 4.50 



3.20 ; 



4.54 

 4.27 

 4.44 

 3.90 ' 



3.48 ; 



2.95 2.78 

 3.99 3.67 

 3.24 2.96 

 3. 92 3. 39 

 3. 09 2. 80 

 2.98 i 2.52 









3.10 



13 



3.05 







4.29 



32 







3.73 



35 



2.88 

 3.91 

 2.70 







4.18 



39 







3.51 



•Other 







3.30 











Inbred -. 



4.43 

 5. 15 

 5.51 

 .5.49 

 5.34 

 5.36 

 5.68 



3.85 

 4.31 

 4.93 1 

 5.06 

 5.12 ! 

 4.63 

 4.58 1 



3.36 ; 3.09 

 3.82 : 3.40 

 3. 98 3. 66 

 4.23 3.53 

 3. 81 3. 77 

 4. 07 3. 46 

 4. 73 3. 40 



3.09 

 3.10 

 3.02 

 3.45 

 2.80 

 3.24 

 4.09 







3.64 



■CO 







4.12 



CA 







4.49 



AC 



3.77 

 5.61 





4.61 



€C 





4.49 



€1 





4.37 



€2 







4.62 











€L 



6.27 

 5.80 



5.16 1 

 5.20 



4.69 : 4.14 

 4.63 3.90 



2.62 

 4.04 



3.92 

 5.20 





4.99 



CG 





4.90 









B 



5.49 



4.77 



3.83 3.50 



i 



3.27 



3.54 





4.35 









Table 21. — Average weight at vjeaning {S3 days), in grams. 



(Average in litters of each size and the index (see Table 18). Inbreediag and crossbreeding experiments, 



1916-1919.] 



Experiment. 







Size of litter. 





Index. 



1 



2 



3 



4 



5 



6 



7 



2 



213.2 

 277.8 

 246.1 

 269.0 

 233.3 

 249.8 



182.4 

 238.5 

 225.0 

 233.8 

 205.1 

 195.1 



163.3 

 206.8 

 177.7 

 203.6 

 170.3 

 167.7 



150.2 

 188.1 

 160.9 

 175.6 

 153.2 

 142.1 









175.1 



225.2 

 201.9 

 ;i9.6 

 189.1 

 185.0 



13 



164.5 







32 







35 



158.0 

 189.5 

 145.5 







39... . 







Other 













Inbred 



247.1 

 271.7 

 292.9 

 292.6 

 279.8 

 284.0 

 292.8 



209.0 

 225.1 

 252.7 

 265.5 

 258.6 

 238.5 

 237.7 



181.4 

 197.5 

 205.4 

 216.9 

 198.1 

 208.5 

 233.6 



163.8 

 174.0 

 189.8 

 184.3 

 192.1 

 181.3 

 177.1 



164.0 

 165.5 

 160.3 

 177.5 

 147.8 

 170.5 

 194.5 







197.8 

 214.2 



CO 







CA 







232.1 



AC 



i79.9 

 259.5 





240.5 



CC 





230.3 



Cl.. 





225.8 



C2 







235.5 











CL 



317.5 

 303.4 



261.6 

 263.0 



229.6 



210.fi 



149.5 

 201.0 



188.3 

 238.4 





250.2 



CG 



235. 7 198. 6 





249.8 













B 



292.6 



248.3 



201.4 



183.2 



170.9 



176.7 





228.1 









