270 



Journal of Agricultural Research 



Vol. XV. No. s 



ration being determined with a respiration apparatus and the heat pro- 

 duction computed. A difference calculation, after making certain cor- 

 rections, shows the net energy of the added starch. 



PERIOD AND RATIONS 



Each feeding period covered three weeks, of which the first 11 

 days constituted the preliminary period while during the last 10 the 

 feces and urine were collected quantitatively. A 48-hour determina- 

 tion of the respiratory products and of the heat production was made 

 on the eighteenth and nineteenth days of each period. The dates of 

 the several periods, the rations fed and the average live weight of the 

 animal in each period are shown in Table I. 



Table I. — Periods, rations, and average live weights 



Period. 



Preliminary period. 



Digestion period. 



Daily rations. 



Hay. Starch. 



Live 

 weights 

 of steer. 



Period I 

 Period 2 

 Period 3 

 Period 4 

 Period 5 

 Period 6 

 Period 7 



1912-13. 

 Dec. 22-Jan. I 

 Jan. i2-Jan. 22 

 Feb. 2-Feb. 12 

 Feb. 23-Mar. 5 

 Mar. i6-Mar. 26 

 Apr. 6-Apr. 16 

 Apr. 27-May 7 



1913- 

 Jan. 2- Jan. 11 

 Jan. 23-Feb. I 

 Feb. 13-Feb. 22 

 Mar. 6-Mar. 15 

 Mar. 27-Apr. 5 

 Apr. 17-Apr. 26 

 May 8-May 17 



Kgm. 



7-50 



Kgm. 

 3.00 

 I. 20 

 I. 70 

 .80 



Kgm. 



388, 

 366, 

 387 

 356. 

 403 

 403 

 377 



COMPOSITION OF FEEDING STUFFS 



The alfalfa hay was from a car of baled hay purchased the previous 

 year in Kansas City, Mo., and stated to have been grown in Idaho. The 

 starch was commercial cornstarch 



Table II. — Composition and energy content of dry matter of feeding stuffs 



Alfalfa hay. 



Period i. 



Periods 2 

 and 3. 



Periods 4 



and 5. 



Periods 6 



and 7. 



Average. 



Starch, 

 Periods 



Ash 



Protein 



Nonprotein 



Crude fiber 



Nitrogen-free extract. .. . 

 Ether extract 



Total nitrogen 



Protein nitrogen 



Carbon 



Energy, calories per kgm. 



Per cent. 



9-74 

 11-34 



3-27 

 30.69 

 43.22 



1.84 



Per cent. 



8.83 

 ID. 96 



3. 21 

 31.86 

 43-38 



I. 76 



Per cent. 



9.27 



11.36 



3-03 

 29. 46 



45- 14 



1-74 



Per cent. 



9-43 

 II. 51 



3. 12 

 29. 96 

 44. 21 



1.77 



Per cent. 



9. 26 



II. 29 



3-14 

 30-47 

 44- 10 



1-77 



100. 00 



2- 51 



I. 82 



45. 00 



4,335-34 



100. CO 



2.44 



1-75 

 44.94 



4, 389. 90 



100. CO 



ICO. 00 



2. 46 



I. 82 



44.98 



4, iZ^- 82 



2. 51 



1.84 



44- 74 



4, 334- 67 



2.48 



I. 81 



44.92 



4, 348. 18 



Per cent. 

 O. 24 



•35 



• 13 

 99. 28 



