B12. The Journal 
Crossbred No. 22 was the result of 
the mating of Kayan, Aberdeen Angus 
bull, to College Creusa, Guernsey cow. 
The corrected monthly milk yield for 
the sire, dam and resulting crossbred 
is shown in the first graph of Fig. 15. 
The milk record of this crossbred cow 
has had some difficulties. In her sec- 
ond lactation this cow gave birth to a 
calf at 245 days which did not live. 
At that time her udder had only just 
begun to make up to its coming lacta- 
tion. Consequently Crossbred No. 22 
produced no milk for this lactation. 
The lactations which have been per- 
fectly normal and which are used to 
determine her milk production are 
those commencing at two years and 
three months and at three years and ten 
months. The abortion which came in 
between these dates is thought to have 
come from an accident in the yard dur- 
ing the time the cows were out for 
exercise and not from contagious abor- 
tion of cattle. This supposition is 
made somewhat stronger by the fact 
that only rare cases of this kind have 
appeared in the herd and then were 
some time apart. 
From the upper graph of Fig. 15 it 
is clearly seen that the milk yield of 
Crossbred No. 22 is intermediate be- 
tween that of her high and her low 
producing line ancestrally speaking. 
The lactation for each month is how- 
ever nearer the milk yield of the high 
parent than it is near the low parent. 
Thus during the first eight months, 
the milk yield of Crossbred No. 22 was 
3320.8 pounds, her high producing 
dam, College Creusa produced 4057.9 
pounds and her low producing sire, 
Kayan’s, potential production was 
1661.5 pounds. Crossbred No. 22 was 
consequently 737.1 pounds of milk less 
than her high producing parent and 
1659.3 pounds more in milk yield than 
her low producing parent or Crossbred 
No. 22 favored the milk yield of the 
high line 2.3 times as closely as she did 
the milk yield of the low line. 
The record for Crossbred No. 26 to- 
gether with that of her parent is shown 
in the second graph of Fig. 15. The 
mating which produced this cow was 
of Heredity 
Kayan, Aberdeen Angus bull, bred to 
Creusa of Orono 3d, Guernsey cow. 
The milk yield of this crossbred cow is 
intermediate between that of her high 
and low parents for the first four 
months of lactation. After the fourth 
month the milk yield of the high parent 
is surpassed by that of the crossbred. 
As will be noted from the other pre- 
ceding graphs this is the first instance 
where the crossbred has actually sur- 
passed the milk yield of her two par- 
ents. The milk yield of Crossbred 
No. 26 for the eight months period is 
4303.5 pounds, that for Creusa of Orono 
3d is 4156.1 pounds and for Kayan 
1661.5 pounds. The crossbred cow 
produced 147.4 pounds more milk than 
her purebred Guernsey parent and 
2642.0 pounds more than her sire’s 
potential milk yield. Crossbred No. 
26 consequently resembles the high 
line of production 17.9 times as closely 
as she does the low line of production. 
Crossbred No. 26 produced this 
amount of milk when calving at one of 
the most unfavorable times of the year, 
September, whereas the lactation of 
her parents came in months which 
were favorable to an average yield. 
Crossbred No. 27 was the result of 
a mating of the Jersey bull, Lakeland’s 
Poet, to the Aberdeen Angus cow, 
Orono Madge. The milk yield of 
Crossbred No. 27 is shown in the third 
graph of Fig. 15. For the first four 
months of lactation the milk produc- 
tion of this cow is lower than that of 
the intermediate between the high and 
the low milk producing lines of her 
ancestry. From the fourth month of 
lactation this crossbred’s milk  pro- 
duction continues to constantly ap- 
proach the milk production of her high 
line ancestry. In describing the milk 
production of this cow it might be said 
it was the persistence with which this 
cow maintained her milk production 
month after month rather than the 
large quantity of her milk yield at any 
one time that causes her to be inter- 
mediate between the high and low lines 
of production. In this connection it 
should be said that this crossbred cow 
commenced her lactations in two 
