﻿TRAlSrSMITTING ABILITY OF HOLSTEHST-FEIESIAN SIRES 3 



Table 1. — A.ges and per cent used in calculating production records to maturity 



Age, calculated to nearest whole month 



Mature 

 record 

 equiva- 

 lent 



Age, calculated to nearest whole month 



Mature 

 record 

 equiva- 

 lent 



9. flTirl nndPT 9^4 yp.nrs 



Per cent i 

 70.0 

 72.5 

 75.0 

 77.5 

 80.0 

 82.5 

 85.0 



3^ and under 4 years 



Per cent^ 

 87.5 



2M and under 2>^ years _ . 



4 and under 4K vears 



90.0 



9M and under 2^.^ year.s 



4M and under 4V^ vears _ 



92.5 



93/[ and nndpr f! yp.nrs 



4J^ and under 4% vears.. 



95.0 



3 and nndpr 3l/( ypars 



43^ and nndpr 5 ypars 



97.5 



31/^ and nndpr SVii ypars 



5 years and over.. 



100.0 



aJ/i and nndp.r 33^ ypars 











1 The percentages used for calculating records to maturity correspond very closely to the percentage 

 differences of the average production in the various classes for the Holstein-Friesian breed. Aside from 

 the corrrection for differences in age, other factors that might cause variation between the records of the 

 daughters and their dams, such as number of times mUked per day, were not considered, as the information 

 is not available. 



PRODUCTION RECORDS OF DAUGHTERS AND THEIR DAMS 



Table 2 shows detailed production records of the daughters of these 

 23 sires, together with the production of their dams; the dam's record 

 in every case is given on the same line as that of her daughter. 

 Averages are stated also, to facilitate comparison. Other figures show 

 the average quantity of milk, percentage of butterfat, and pounds 

 of butterf at by which the daughters exceed their dams or are exceeded 

 by their dams. Plus and minus signs indicate excess or deficiency of 

 the average daughter's performance compared with the average dam's 

 performance. 



The object of the investigation was to study the hereditary trans- 

 mission of production, not to point out the good or the poor sires of the 

 breed; hence the sires in these lists have been designated by letter 

 and not by name. The records are arranged in the order of the 

 daughters' butterfat records, beginning with the highest record. 



Table 2. — Production records of daughters and their dams 

 SIRE a 





Daughters 



Dams 





Milk 



Butterfat 



Milk 



Butterfat 



1 



Pounds 

 22, 757. 

 22,51.5.2 

 21,260.8 

 10, 200. 

 15, 079. 7 



Per cent 

 3.43 

 3.21 

 3.20 

 3.47 

 3.60 



Pounds 

 779.7 

 723. 1 

 678.6 

 6G4. 7 

 543.4 



Pounds 

 10, 928. 3 

 18, 290. 1 

 13, 28.5. 

 17, 287. 3 

 12, 533. 4 



Per cent 

 3.30 

 3.03 

 3.40 

 3.32 

 3.12 



Pounds 

 361.4 



2. 



554 7 



3 



451. 8 



4 



575.0 



6 



391.8 







Average of 5 



19, 575. 7 



+5,110.9 



+35.3 



3.36 

 +0. 13 

 +4.02 



057. 9 

 + 191.0 

 +40.9 



14, 464. 8 



3.23 



466.9 



Increase (+) of daughters over dams 





Per cent increase 

















Four daughters exceeded dams in milk. 



Four daughters exceeded dams in butterfat. 



Four daughters exceeded dams in percentage of butterfat. 



