Gowen: 
Transmission of Milk Yield 307 
CROSSBRED NO. 16 
The product of the Angus and Jersey parents shown on the opposite page. The polled head and 
heavy fleshing of the fore-quarters are characteristic features of such a cross. 
For the whole 
lactation period, this crossbred’s milk production was clearly intermediate between that of the 
high producing parent and the lower producing parent. 
last graph in Fig. 14 (Fig. 13.) 
is based on six lactation records. The 
record for the sire, Delva’s University 
De Kol, is that of the Holstein-Friesian 
milk production for this herd at two 
years as previously described. The 
curve for the milk production of Cross- 
bred No. 2 clearly follows that of the 
Holstein-Friesian, or the high milk 
producing breed. The continuation 
of the lactation from the eighth month 
on for the Crossbred No. 2 would 
clearly follow the milk yield of the 
Holstein-Friesian parent. Unfortu- 
nately this record is not available as the 
cow on the tuberculin test showed a 
temperature, was judged. tubercular 
and killed. Her autopsy did not how- 
ever show any lesions which were 
noticeable. Her record is therefore rep- 
resentative, so far as it goes. The 
photograph of this cow is shown in the 
following paper of this series, in the 
next issue of this Journal. 
Compare the records as shown by the 
PERIOD OF LOWEST MILK YIELD 
Considering the record of the differ- 
ent months individually it is seen that 
the milk yield of the first four months 
is more nearly intermediate than is the 
milk yield of the succeeding months. 
This more nearly intermediate condi- 
tion or approach of the crossbred cows 
to the low line is somewhat typical of 
the other crosses. What explanation 
may be found for its occurrence is ob- 
scure in the light of our present knowl- 
edge. It is known that the time of 
year when a cow freshens may increase 
or reduce the milk yield somewhat. 
The times of year favoring the lowest 
milk yield are the months July, Au- 
gust, and September in this climate. 
As Crossbred No. 2 calved in August 
this may explain her not reaching the 
production of the high parent during 
these first four months. Before this 
