12 BULLETIN 1372, U. S. DEPARTMENT OF AGRICULTURE 
272 pounds over the dam. The highest-record dam produced 846 
pounds of butterfat and her daughter 744 pounds, or a 102-pound 
decrease. This daughter of the highest-record dam has a record that 
is 100 pounds lower than that of the highest-record daughter, whose 
dam's record, 572 pounds of butterfat, is 274 pounds less than that 
of the highest-record dam. 
The highest-record daughter of sire F was out of a dam with the 
highest record of any of the dams, 20,847 pounds of milk and 830 
pounds of butterfat; yet this daughter's record is larger than the 
dam's by 5,845 pounds of milk and 249 pounds of butterfat. His 
lowest-record daughter was out of the lowest-record dam. This 
dam has a record of 16,483 pounds of milk and 531 pounds of butter- 
fat. Her daughter's record is larger by 350 pounds of milk and 
49 pounds of butterfat. Note the difference between this increase 
from a low-record dam and the increase from the highest-record 
dam. Two of his other daughter's records were lower than those 
of their dams. 
The highest-record dam of the daughters of sire G has a record 
of 913 pounds of butterfat. The daughter of this dam exceeded this 
record by 59 pounds. This increase was due to a rise of almost 
1 per cent of butterfat. The yield of milk of the daughter was less by 
5,046 pounds. The lowest-record dam produced 581 pounds of 
butterfat and her daughter 531 pounds, a decrease of 50 pounds. 
This decrease was due to both a lower yield of milk and a lower per- 
centage of butterfat in the milk. The one other daughter of this 
sire that had a lower butterfat record than her dam was out of a dam 
which produced 802 pounds of butterfat. 
Included in the list of six daughters of sire I are two pairs of full 
sisters. The dam of one of these pairs had a record of 17,514 pounds 
of milk and 629 pounds of butterfat. Both daughters of this dam 
made more milk and more butterfat than the dam. One daughter 
exceeded her dam's production by 4,794 pounds of milk and 162 
pounds of butterfat and had nearly the same test as the dam. The 
other daughter produced 5,715 pounds of milk more than the dam, 
but the percentage of butterfat in her milk was 0.37 less than that 
of her dam and her increase in total butterfat was only 119 pounds. 
The dam of the other pair of sisters has a record of 14,178 pounds 
of milk and 500 pounds of butterfat. One of these sisters increased 
the yield of milk 7,971 pounds, lowered the percentage of butterfat 
0.49 (from 3.53 to 3.04) and increased the total butterfat 175 pounds. 
The other sister decreased the yield of milk 2,625 pounds, raised the 
percentage of fat 0.24 and decreased the total butterfat 64 pounds. 
Such examples as those mentioned may be cited in the records of 
the daughters of every sire in the list. A careful study of the com- 
parative records of each sire will show great variations in the records 
of the daughters of the same sire, and between the records of the 
daughters and their dams. Instances are found of the highest- 
record daughters coming from the lowest-record dams. There are 
other instances in which both the highest-record and the lowest- 
record dams have daughters which show increases, whereas other 
dams coming in between these extremes have daughters showing 
decreases. 
It seems clear that the daughters' records are not a blend between 
the production ability of sire and dam, and it also seems clear that the 
increase or decrease of the records of a sire's daughters over or under 
