UTAH ACADEMY OF SCIENCES 115 
The first year, after the preliminary period, the first 
test period consisted of four weeks, the second test period 
four weeks, and the third test period three weeks, it being 
necessary to finish the experiment one week earlier than 
planned on account of the hay running short. 
Both feed and milk were carefully sampled for chem- 
ical analysis. The milk was composited for a week and 
the samples tested for butter fat each week, the calcula- 
tions for fat being based upon these results. 
The results here reported are only for the yields of 
butter fat and the feed consumed, the chemical data not 
having been included. The results are stated in number 
of pounds of butter fat produced for each 100 feed units 
consumed. A feed unit is an expression to equate the vari- 
ous feeds used to a uniform basis. The factors used are 
those reported as results of a very great number of Danish 
feeding experiments and include also data from the results . 
obtained in the United States recently published by the 
Wisconsin Experiment Station, that is, one pound of grain 
of certain kinds, such as corn, barley, wheat, and so on, is 
considered to equal one feed unit. This is taken as a basis. 
1.1 pounds of oats are required to equal 1 feed unit, 1.1 
pounds of bran equal one feed unit and 2 pounds of alfalfa 
hay are considered equivalent to 1 feed unit. That is, the 
grains used stand in the ratio 1 pound of barley equals 1.1 
pounds of oats equals 1.1 pounds of bran, equals 2 pounds 
of alfalfa hay. 
The calculations based upon these factors give the 
first year for each 100 feed units consumed: the first hay 
crop produced 5.16 pounds of butter fat; the second crop 
produced 5.40 pounds of butter fat; the third crop pro- 
duced 4.88 pounds of butter fat. 
The results of the second year show that 100 feed units 
from the various crops produced as follows: First crop, 
4.80 pounds of butter fat; second crop, 5.30 pounds of but- 
ter fat; third crop, 4.66 pounds of butter fat. 
Both years’ results, then, seem to favor second crop 
hay. This is decidedly contrary to the experience of the 
