Gowen: Transmission of Butter-fat Percentage 
367 
CROSSBRED NO. 2, HOLSTEIN-FRIESIAN X GUERNSEY CROSS 
In size of body and profile of nose this crossbred shows the characteristics of her Holstein-Friesian 
sire. Her percentage of butter fat production is slightly lower than that of either parent. See 
the second graph in Fig. 24. (Fig. 18.) 
The graph for the butter-fat percent- 
age of Crossbred No. 12 shows it to be 
intermediate between the high testing 
and the low testing parents. The low 
testing parent is more closely followed 
by the Crossbred for each monthly test. 
The eight months butter-fat percent- 
age of Crossbred No. 12 is 3.885 per 
cent, the Guernsey dam has a butter- 
fat percentage of 5.476 percent and the 
Holstein-Friesian sire’s potential but- 
ter-fat percentage is 3.399 per cent. 
The crossbred cow’s butter-fat per cent 
is 1.591 per cent less than her high 
testing dam and 0.486 per cent more 
than her low testing parent, or the 
crossbred is 3.3 times as near the low 
butter-fat percentage as she is the high 
butter-fat percentage. 
BUTTER-FAT PERCENTAGES OF SIMILAR 
MATINGS 
It is of some interest to compare the 
butter-fat percentage of the similar 
mating for Crossbred No. 2 with the 
results for this mating of Crossbred No. 
12. The Guernsey dam in the first case 
had a very low butter-fat percentage 
3.961 whereas the Guernsey dam for 
number 12 had a butter-fat percentage 
which is above the average for the 
breed. The butter-fat percentage of 
the Crossbred in the first case was low, 
lower even than the Holstein-Friesian 
parent. The butter-fat percentage of 
the Crossbred in the second case was 
higher, almost equaling that of the low 
testing Guernsey dam of the first cross. 
The Aberdeen-Angus breed has a 
butter-fat percentage about the same 
as that of the lower testing Jerseys and 
Guernseys of these experiments, that 
is a mean of about 4.4 per cent with 
considerable range on either side of this 
point. The crosses made between 
these lower testing Jerseys and Guern- 
seys with the Aberdeen-Angus are con- 
