32 BULLETIN 931, U. S. DEPARTMENT OF AGRICULTURE. 
Of 134 men who owned 6 or 7 head before purchasing trucks — 
83 disposed of none. 
4 disposed of 1. 
42 disposed of 2. 
5 disposed of 3. 
Of 126 men who owned 8 or 9 head before purchasing trucks — 
70 disposed of none. 
6 disposed of 1. 
33 disposed of 2. 
12 disposed of 3. 
5 disposed of 4. 
Of 103 men who owned 10 or 11 head before purchasing trucks — 
46 disposed of none. 
4 disposed of 1. 
33 disposed of 2. 
13 disposed of 3. 
6 disposed of 4. 
1 disposed of more than 4. 
Of 76 men who owned 12 or 13 head before purchasing trucks— 
35 disposed of none. 
3 disposed of 1. 
12 disposed of 2. 
3 disposed of 3. 
16 disposed of 4. 
7 disposed of more than 4. 
Of 111 men who owned 14 or more head before purchasing trucks — 
53 disposed of none. 
1 disposed of 1. 
10 disposed of 2. 
5 disposed of 3. 
26 disposed of 4. 
16 disposed of more than 4. 
In all, 57 per cent have disposed of no work stock. 
25 per cent have disposed of 1 or 2 head. 
14 per cent have disposed of 3 or 4 head. 
4 per cent have disposed of 5 or more head. 
Evidently the displacement of horses by motor trucks is not as 
great as the displacement by tractors in the corn belt. Farmers' 
Bulletin 1093, " Influence of the Tractor on Use of Horses," shows 
that on 141 corn-belt farms averaging 346 acres in size 2.5 head per 
farm were disposed of after the purchase of tractors. 
FARMS ON WHICH TRACTORS ARE OWNED. 
Tractors as well as motor trucks are owned on about half of these 
farms. However, most of the tractors are on the larger farms. Only 
33 per cent of the men with 160 or less crop acres own tractors, while 
65 per cent of those with over 320 crop acres own them. 
In all, 745 men stated whether they owned tractors and also gave 
the number of crop acres in their farms. The number of those with 
