﻿22 



BULLETIN 1312, U. S. DEPARTMENT OF AGEICULTUEB 



Table 10. — Correlation between daughters of each sire and their dams with respect 



to total yield of butterfat 



Sire 



Number 



of 

 daugh- 

 ters with 

 yearly 

 records 



Average produc- 

 tion of butterfat 



Standard deviation 



Correlation 

 between 



Daugh- 

 ters 



Dams 



Daughters 



Dams 



daughters 

 and dams 



A -.. 



5 



13 

 12 

 9 

 6 

 9 

 7 

 6 

 6 

 20 

 6 

 11 

 6 

 9 

 6 

 6 

 11 

 6 

 7 

 7 

 7 

 7 

 16 



Pounds 

 657.9 

 745.3 

 786. C 

 688.7 

 783.9 

 760.3 

 795. 9 

 659.4 

 632.8 

 735.3 

 622.2 

 623.6 

 523. 5 

 607.2 

 556.3 

 582. 2 

 585.7 

 432.3 

 503.8 

 634.5 

 452. 3 

 508.0 

 621.2 



Pounds 

 466.9 

 581.5 

 647.9 

 562.4 

 663. 5 

 651.3 

 697.2 

 567.0 

 541.8 

 658.7 

 548.3 

 578.8 

 492.9 

 589.7 

 543. 1 

 525.8 

 589.6 

 442.7 

 536.0 

 685.8 

 510.5 

 568.5 

 693.5 



90.9 

 131.9 



100.8 

 95.6 

 103.1 

 144.7 

 161.9 

 68.7 

 170.3 

 158.0 

 107.4 

 99.0 

 47.0 

 76.3 

 136.7 

 95.7 

 95.8 

 51.5 

 61.0 

 71.2 

 30.2 

 48.5 

 89.4 



±19.3 

 ±17.4 

 ±13.9 

 ±15.2 

 ±20.1 

 ±2.3.0 

 ±29.2 

 ±13. 4 

 ±33.2 

 ±16.8 

 ±20.9 

 ±14.2 

 ±9.2 

 ±12.1 

 ±26.6 

 ±18.6 

 ±13. 8 

 ±10.0 

 ±11.0 

 ±12.8 

 ±5.5 

 ±8.7 

 ±10.7 



85.0 

 80.6 

 113.4 

 128.9 

 25.6 

 92.6 

 110.5 

 78.5 

 62.7 

 217. 7 

 91.2 

 86.1 

 72.7 

 148.7 

 142.9 

 66.9 

 80.3 

 6-3.1 

 64.3 

 35.5 

 78.0 

 77.7 

 61.6 



±18.1 

 ±10.7 

 ±15.6 

 ±20.5 



±5.0 

 ±14.7 

 ±19.9 

 ±15.3 

 ±12.2 

 ±23.2 

 ±17.8 

 ±12.4 

 ±14.2 

 ±23.6 

 ±27.8 

 ±13.0 

 ±11.5 

 ±12.3 

 ±11.6 



±6.4 

 ±14.1 

 ±14.0 



±7.3 



-0. 09±0. 30 



B 



-0. 23±0. 18 



C 



-fO. 17±0. 19 



D 



-fO. 60±0. 14 



E.. 



-f 0. 15±0. 27 



F 



4-0. 71±0. 11 



G 



-fO. 43±0. 21 



H 



+0. 48±0. 21 



!..._ 



+0. 47±0. 22 



J 



+0. 34-+-0. 13 



K. 



+0. 67±0. 15 



L.- . 



-fO. 71±0. 10 



M. 



—0. 22±0. 26 



N.. 



—0. 39±0. 19 







-fO. 51±0. 30 



P _ 



H-O. 90±0. 05 



Q-. - - 



-0. 15±0. 20 



R 



+0. 66±0. 16 



S 



+0. 09±0. 25 



T 



-0. 27±0. 24 



TJ 



-0. 23±0. 24 



V 



+0. 06±0. 25 



w.. 



-J-0. 06±0. 16 







The number of tested daughters that these 23 sires have is rather 

 small for the determination of a coefficient of correlation that is 

 really indicative. A study of the coefficients of correlation between 

 the daughters and their dams indicates that with the daughters of 

 three sires there is a marked correlation. These tkree decided cor- 

 relations are between the daughters and their dams of sire L ( + 0.71 

 ±0.10), sire F ( + 0.71 ±0.11), and sire P ( + 0.90 ±0.05). The last 

 is the most significant of the three. In Table 2 it may be noted 

 how closely both the milk and butterfat yields of the daughters of 

 sire P follow those of the dam (from the highest daughter out of the 

 highest dam down to the lowest daughter out of the lowest dam). 

 The ranking of the records of the dams according to size of record 

 does not follow that of the daughters so closely with the other two 

 sires, though the similarity of sequence is very apparent. 



The daughters of four other sires show evidence of correlation with 

 their dams with respect to yield of butterfat, though the probable 

 error is rather high. These four sires are: Sire D ( + 0.60 ±0.14); 

 sire H( + 0.48 ±0.21); sire K ( + 0.67 ±0.15); sire R ( + 0.66 ±0.16). 



A study of the records of the daughters of these bulls and their 

 dams indicates somewhat the same general ranking of the dams' 

 records with reference to size as that of the daughters; for instance, 

 with 2 of the 4 sires the lowest-record daughter is out of the lowest- 

 record dam, and with 3 of the 4 sires the highest-record daughter is 

 put of the highest-record dam. 



