Gowen: Transmission of Milk Yield gai 
months quite unfavorable to a high 
milk flow for the subsequent eight 
months of production. 
The milk yield for the eight months 
period was 2995.7 pounds for Cross- 
bred No. 27; 3919.0 pounds for Lake- 
land’s Poet, her purebred Jersey sire; 
and 1569.3 pounds for Orono Madge, 
her purebred Aberdeen Angus dam. 
The crossbred cow’s milk production 
was consequently 923.3 pounds less 
than her high producing sire and 1426.4 
pounds more than her low producing 
dam. The crossbred cow resembled 
the high producing parent 1.5 times 
as closely for the eight months period 
as she did her low producing dam. 
The fourth graph of Fig.15 shows the 
monthly milk yield of Crossbred No. 
29 and her purebred parents. _Cross- 
bred No. 29 is the result of a cross 
between the Aberdeen Angus bull, 
Kayan, and the Guernsey cow, Creusa’s 
Lady. The milk yield of the crossbred 
cow is intermediate between that of 
her high milk producing parent and 
her low milk producing parent for the 
first four months of lactation. After 
the fourth month Crossbred No. 29 
follows the high line of production 
quite closely until the last two months 
of her lactation when she approaches 
the intermediate again. 
For the eight months lactation period 
Crossbred No. 29 produced 2909.7 
pounds of milk; her purebred Guernsey 
parent produced 3271.5 pounds and 
her Aberdeen Angus sires potential 
milk yield was 1661.5 pounds. The 
difference of the crossbred’s milk yield 
and that of her Guernsey mother was 
361.8 pounds. The difference from 
the potential milk yield of her sire was 
1248.2 pounds. The crossbred cow 
consequently resembled her high pro- 
ducing line 3.4 times’as closely as she 
did her low producing line. 
Crossbred No. 37 was the result of 
mating Kayan, Aberdeen Angus, to 
Dot Alaska, Ayrshire. The milk pro- 
duction of this crossbred exceeded that 
of her high line Ayrshire dam during 
the first four months of lactation. 
After that time the milk yield was ap- 
proximately equal. During the first 
2 
ww 
. 
eight months of lactation Crossbred 
No. 37 produced 3984.7 pounds of milk 
or 129.0 pounds more than the produc- 
tion of her purebred Ayrshire dam. 
The potential milk production of 
Kayan was 1661.5, pounds, or Crossbred 
No. 37, his offspring, produced 2323.2 
pounds more milk than this potential 
yield. The crossbred cow was conse- 
quently 18 times as close to the high 
line of production as she was to the low 
line of production. The time of calv- 
ing during the year was favorable to 
medium to high yield records. 
Crossbred No. 44 was the result of 
crossing the Holstein-Friesian bull, 
Taurus Creamelle Hengerveld on to 
the Aberdeen Angus cow, Orono 
Madge. The bottom graph of Fig. 15 
shows the milk production of the two 
parents and the crossbred. Too much 
weight should not be given this record 
as the first lactation record is as yet not 
even complete. It is to be expected 
that subsequent lactation records may 
modify considerably the record of this 
crossbred cow from what it is as it now 
stands. For the first four months of 
lactation the crossbred cow occupies a 
strictly intermediate position between 
the high and low lines of production. 
After the fourth month the lactation 
record approaches the high line of pro- 
duction. The milk yield for the eight 
months period was 4306.3 pounds for 
Crossbred No. 44; 5548.9 pounds for 
the potential milk yield of the pure bred 
Holstein-Friesian sire; and 1569.3 
pounds for the Aberdeen Angus dam. 
The crossbred cow was 2737.0 pounds 
more milk than its low producing dam 
and 1242.6 pounds less than its high 
line sire. The crossbred resembles the 
high line of production 2.2 times as 
closely as it does the low line of pro- 
duction. 
DOMINANCE OF MILK PRODUCING FAC- 
TORS 
If the substance of the preceding 
pages is recapitulated it is found that 
Crossbred No. 1 resembles her low 
producing parent 7.7 times as closely as 
she does the high producing parent. 
The other eleven crossbreds resemble 
