6 
Colorado Agricultural Experiment Station 
approximating the cost of the tankage delivered at Fort Collins, 75 
miles from Denver. 
While the cost of gain with the fertilizer tankage was less than 
for the other lots, it was not enough less to mark the fertilizer tankage 
as a superior feed, for the finish of the pigs in this lot was not so good 
as in the others because of the smaller gain in weight. The results 
were striking enough, however, to warrant further investigation of the 
fertilizer tankage as a hog feed. 
Because of certain processes sometimes used in making fertilizer 
tankage, the product from some packing houses is mot a safe hog feed. 
A discussion of the merits and dangers will be found in the final dis¬ 
cussion of results farther on in this bulletin. 
Selected Tankage with Corn. 
There were three lots of hogs upon selected tankage and corn, 
Pen 3 receiving 1 part of tankage to 6 parts of corn, Pen 4 receiving 
1 part of tankage to 3 parts of corn, and Pen 5 receiving during the 
first four weeks 1 part of tankage to 3 parts of corn, during the second 
four weeks 1 part to 4, and during the last six weeks 1 part tankage 
to 6 parts corn. Thus the shoats in this lot received a ration with less 
protein and more carbohydrates towards the close. 
Pen 3, receiving 1 part selected tankage to 6 parts corn, gave the 
largest gain of the three, and this gain was produced more economically 
than that of any other pen fed selected tankage and corn. The proportion 
of tankage fed Pen 4, one part to three of corn, caused a heavy expense 
for gain. No advantage was found from feeding one part tankage to 
three of corn at the start and decreasing until the proportion was 1 to 6. 
It seems better to feed 1 part tankage to 6 parts corn from start to 
finish. 
Selected Tankage, Corn, and Barley 
The highest gain made by any pen in the series was that made by 
Pen 1, fed 3 parts corn, 3 parts barley, and 1 part selected tankage 
Compared with the ration of 6 parts corn and 1 part tankage (Pen 3) 
the cost of gain was practically the same, and the finish of the hogs 
higher, making this ration a very satisfactory one. 
Corn and Wheat Shorts. 
This ration was used as a comparison or check ration for all the 
others, as most hog feeders know about what this ration will do. It 
will be seen that out of six pens, the pen on this ration made the poor¬ 
est gains of any, and the gain made was the most expensive excepting 
that made by lot 4. This means that all of the other rations except the 
one where selected tankage was fed too heavily, proved superior to a 
ration that is considered a very good one by practical feeders in the 
corn belt. 
