﻿18 BDXJJilTIlSr 1372, V. S. DEPARTMENT OF AGEICTJLTUBE 



PREPOTENCY OF THE SIRE 



The available records do not indicate whether a sire can be com- 

 pletely prepotent in raising the production of his daughters, for the 

 reason tnat comparatively few of the tested daughters of the various 

 sires have dams that have been tested. Then, too, the lowest- 

 producing daughters of a sire may not be tested, for it is doubtful 

 whether some breeders would test a low-producing daughter of their 

 herd sires. When the dam of a tested daughter does have a record, 

 information is not available to show whether the dam's record was 

 made under as favorable conditions as was the daughter's record. 

 Although the information relative to the conditions under which the 

 dams and daughters were tested is not available, and it is not known 

 whether the poorer-producing daughters of these sires were tested, 

 the information contained m Table 8 should be of interest. It 

 shows the number of each of the 23 sires' daughters that increased and 

 the number that decreased the yield of milk and butterfat, and the 

 percentage of butterfat in the milk as compared with the 3delds of 

 their dams. 



Table 8. — Number of each sire's tested daughters that increased or decreased the 

 milk and butterfat yield and the percentage of butterfat, as compared with their 

 dams 



Sire 



Number 



of 



daughters 



with 



tested 



dam^ 



MOk yield 



Percentage of 

 butterfat 



Total butterfat 



In- 

 creased 



De- 

 creased 



In- 

 creased 



De- 

 creased 



In- 

 creased 



De- 

 creased 



A.- - 



5 

 13 

 12 

 9 

 6 

 9 



4 

 11 

 10 

 7 

 6 

 7 

 3 

 5 

 4 

 11 

 4 

 9 

 4 

 5 

 3 

 1 

 7 

 3 

 3 

 4 

 2 

 1 

 5 



1 

 2 

 2 

 2 

 

 2 

 4 

 1 

 2 

 9 

 2 

 2 

 2 

 4 

 3 

 5 

 4 

 3 

 4 

 3 

 5 

 6 

 11 



4 

 8 

 7 

 4 

 4 



14 

 4 

 2 

 1 

 115 

 6 

 2 

 2 



13 

 3 

 5 



13 

 2 

 3 

 1 

 1 

 5 

 2 



1 

 5 

 5 

 5 

 2 



14 

 3 

 4 

 5 



14 



I 



4 

 15 

 3 

 1 

 J7 

 4 

 4 

 6 

 6 

 2 

 14 



4 

 11 

 9 

 8 

 6 

 7 

 6 

 5 

 4 

 14 

 5 

 9 

 4 

 5 

 4 

 3 

 8 

 2 

 2 

 2 

 1 

 2 

 2 



1 



B 



2 



C 



3 



D 



X 



E - . 







F 



2 



G 



H 



7 

 6 



2 

 1 



I 



6 

 20 



6 

 11 



I 

 6 

 6 



11 

 6 

 7 

 7 

 7 

 7 



16 



2 



J 



6 



K 



1 



L 



■ 2 



M 



2 



N 



4 



o 



2 



P 



3 



Q 



3 



R 



4 



S 



5 



T 



5 



U -.- 



6 



V 



6 



w 



14 







1 One daughter had same test as dam. 



In Table 8, the second column gives the number of daughters of 

 each sire that have yearly records and have dams with yearly records. 

 In the column headed ''Milk yield" is shown, on the left side, the 

 number of daughters that made larger milk yields than their dams, 

 and on the right side the number of daughters that made smaller 



Sields than their dams. Similar comparisons are given in the columns 

 eaded ''Percentage of butterfat" and "Total butterfat." In the 

 column headed "Percentage of butterfat," it will be noted that the 

 number of daughters increasing and the number of daughters decreas- 



