THIRTEENTH ANNUAL YEAR BOOK— PART IV 



141 



steer were twice as large as the oil meal. The gains were also more 

 rapid with the cottonseed, or 2.87, as compared to 2.6. Silage was used 

 as a roughness in this experiment. 



The relative efficiency of oil meal and cottonseed meal, therefore, is 

 not easy to express in figures. However, when silage is being used, oil 

 meal is probably worth for calves about $35 a ton, when cottonseed costs 

 $30; for yearlings $32 or $33, while with two-year-olds or older it is a 

 toss-up. Now when prairie or timothy hay, corn fodder, corn stover, mil- 

 let, or other neutral or constipating roughage is used, oil meal for calves, 

 with cottonseed rneal at $30, should be worth 337 to $39; with yearlings, 

 $34 to $35, and with two-year-olds or older $31 to $32. 



How about cottonseed meal versus cold pressed cake? We compared 

 these two supplements with the following results: 



COTTONSEED MEAL VS. COLD PRESSED CAKE. 



Yearlings (seven at 700 pounds), December 18, 1908, to June 4, 1909—168 

 days. Animal Husbandry Section, Iowa Experiment Station. Corn 

 and cob meal, supplement, and mixed hay. 



Daily gain, average 



Daily feed, average — 



Corn and cob meal . . . 



Supplement 



Mixed hay 



Feed for 100 pounds gain- 

 Corn and cob meal . . 



Supplement 



Mixed hay 



Cost of 100 pounds gain . . 



Selling price of cattle 



14.43 

 4.35 

 5.29 



*Corn and cob meal, 43 cents; cottonseed meal, $30; cold pressed cake, 

 $25; hay, $10. **Corn and cob meal, 53 cents; cottonseed meal, $30; cold 

 pressed cake, $25; hay, $12. Cottonseed meal, 42.867 protein; cold cake, 

 28.09 per cent. 



With the yearlings, mixed hay being used, the two supplements gave 

 practically equal gains, equal costs, and equal selling prices. The cold 

 pressed cake, however, was figured at $25 and the cottonseed meal at 

 $30. .It is interesting to note that the staple average price difference be- 

 tween these two feeds as determined directly by supply and demand (or 

 indirectly by the common sense of the feeder), is approximately $5. 



At the Missouri station. Professor Allison compared cold pressed cake 

 and cottonseed meal. He fed them, however, in equal quantities, which 



