THE VETERINARY SCIENCE 
these cases put the cow to the bull immediately after fixing it. 
If from inbreeding, try and start her to breed by putting her 
to a mongrel-bred bull. 
Little can be done for a barren bull. We, however, 
highly recommend an impregnator, directions for the use of 
which are given with the instrument. See announcement. 
7. What Constitutes a Dose. 
All the doses mentioned in Part III. if not specially men- 
tioned to the contrary, are intended for an average sized cow, 
steer or bull under ordinary conditions. Consequently in 
prescribing for calves or young cattle it is necessary to 
regulate the dose according to the age, size and condition of 
the animal. 
Calves under one year should be given about one-third of 
the dose indicated as an average dose for a cow, steer or bull 
under ordinary conditions. 
Two-year-olds should be given one-half of the dose indi- 
cated. 
Three-year-olds and those older may be considered to 
require the average dose. 
Cattle above the average size, such as large bulls, cows, 
or steers, may be given a Httle more than the average. 
