﻿TEANSMITTING ABILITY OF HOLSTEIN-FEIESIAlSr SIRES 



29 



There is a significant correlation between the daughters and their 

 dams with respect to percentage of butterfat in the cases of the fol- 

 lowing seven sires (Table 17) : 



Table 17. 



■Sires between lohose daughters and their dams there is a significant 

 correlation 



Sire 



Correlation 



Sire 



Correlation 



F - -- 



+0. 75 ±0. 10 

 +0.98 ±0.01 

 +0. 65 ±0. 16 

 +0. 94 ±0. 03 



s 



V. 



+0. 75 ±0. 11 



11 



+0. 79 ±0. 09 







M 



+0. 93 ±0. 04 



R . 











This marked correlation is easily seen when the percentages of 

 butterfat of daughter and of dam are placed side by side and ranked 

 according to the size of the daughters' tests, as shown in Table 18 

 for the daughters of sires S, IT, and R. 



Table 18. — Percentage of hutterfat of daughters of sires S, H, and R, and their 

 dams, shoioing positive correlation 



Sire 



Daugh- 

 ters 



Dams 



Sire 



Daugh- 

 ters 



Dams 



Sire' 



Daugh- 

 ters 



Dams 



S - 



Per ceni 

 4.30 

 4.00 

 3.88 

 3.44 

 3.28 

 3.27 

 3.18 



Per cent 

 4.44 

 3.88 

 3.22 

 3.37 

 3.63 

 3.34 

 3.24 



n. 



Per cent 

 3.75 

 3.66 

 3.37 

 3.13 

 3.04 

 3.01 



Per cent 

 3.72 

 3.74 

 3.39 

 3.14 

 3.08 

 2.92 



R 



Per cent 

 3.40 

 3.31 

 3.23 

 3.20 

 2.75 

 2.61 



Per cent 

 3.53 









3.25 



■ 3.33 



3.53 



2.74 

 2.74 



These figures show, as does the coeflicient of correlation, that the 

 butterfaft test of the daughters of these sires follows very closely 

 that of their dams. The average percentage of butterfat of the 

 daughters was very close to the average percentage of butterfat of 

 the dams, with each of these tliree sires. The average percentage 

 of butterfat of the daughters of sires R and H were slightly less than 

 the average of the dams, whereas the average for the daughters of 

 sire S was slightly greater. On the other hand a comparison of tests 

 of the daughters of other sires and their dams shows that the test 

 of the daughters does not follow that of their dams. The compara- 

 tive tests of the daugliters of the two sires G and J and their dams, 

 shown in Table 19, illustrate this point. 



Table 19. — Per cent of butterfat of daughters of sires G and J and their dams, 



showing no correlation 



Sire 



Daugh- 

 ters 



Dams 



Siro 



Daugh- 

 ters 



Dams 





Per cent 



Pcrc cnl 





Per cent 



Per cent 



O 



4,31 



3.83 

 4.30 



J (COlltillUOllj 



3.70 

 3.70 



3.58 







4.01 





4.25 



3.01 





3.00 



3.00 





4.21 



3. 25 





3.01 



3.70 





3. 81 



'i.M 





3.59 



3.29 





3. 43 



3. 60 





3. 59 



3.29 





3. 32 



3. 52 





3. 55 



3. 55 



J 



4.29 

 4.14 



3.42 

 3. 5* 





3. 55 

 3.48 



3.33 





3.40 





4. 04 



3. 4« 





3.44 



3.42 





3.80 



3.01 





3.40 



3.40 





3.79 



3. 45 





3. 39 



3.27 





3. 78 



3. .'-.9 





3.24 



3.00 





3.77 



3, 2S 









