184 REpoRT OF THE First ASSISTANT OF THE 

having been made. Only the average results are here given. 
As yarying amounts of milk of different quality were given by 
different animals the actual weights of the different constituents ) 
yielded by each cow were considered in determining the average 
composition of all the milk. 
A sufficient supply of one kind of forage was not always 
obtainable for periods longer than 15 days—as a number of 
other animals besides those from which the results are here 
reported were always fed at the same time;— but whenever a 
good succession was available one kind of forage was fed for a 
month. The periods of feeding are, therefore, often not so long 
as would be desired. For the purpose of securing data, other 
than that here reported, relative to the production of individual 
animals, it was necessary to feed-a fairly constant proportion of 
grain at certain months of lactation. On this account no results 
are here reported that have been obtained when the forage was 
fed without grain. The grain was fed in moderate quantities, 
but always separately from the coarse fodder, so that if any 
should be left at any time it could be weighed. The grain was 
fed twice daily, at 5 o’clock a. m. and at 5 o’clock Pp. m., in 
generally equal quantities — when there was any difference the 
evening feed was one-half pound the greater. Forage or hay was 
fed at 5 o’clock a. m., at 11:30 a.m. and at 5 o’clock Pp. m. The 
forage and hay were generally fed in quantities likely to be 
entirely eaten, but account was kept of any- food left to the 
amount of one ounce. Only the weight of food actually con- ~ 
sumed is given in the tables. The cows were milked at 
5 o'clock a. m. and at 5 o’clock p. m. Analyses were madeat 
frequent intervals of milk from each cow, and all the foods were 
analyzed. , 
In estimating the amounts of digestible constituents in the — 
different foods the average co-efficients of digestibility obtained 
in digestion experiments made in this country and Germany 
were used. Whenever enough data were available the American 
co-efficients were used. 
In calculating the cost of the rations, wheat bran was rated at 
$18 per ton, corn meal at $20, ground oats at $25, linseed meal, 
O. P., at $27, linseed meal, N. P., at $25, gluten meal at $25, 4 
wheat middlings at $20, cottonseed meal at $30, gluten feed at — a 
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