248 



Journal of Agricultural Research 



Vol. XVIII, No. s 



Week 



No. 



3- 

 4- 

 5- 

 6. 



7- 

 8. 



9- 

 10. 

 II. 

 12. 

 13- 

 14- 

 15- 

 16. 



17- 

 18. 

 19. 

 20. 

 21. 

 22. 

 23- 

 24- 

 25- 

 26. 

 27. 

 28. 

 29. 

 30- 

 31- 

 32. 

 33- 

 34. 

 35- 

 36. 

 37- 



Tabi,E V. — Nitrogen metabolism of steers — Continued 



FULL FEED LOT 



[Expressed as pounds per period of seven days] 



Steer 661.0 



Nitro- 

 gen 



ingest- 

 ed. 



2.959 

 2.838 

 2. 694 

 2.797 

 2.540 

 2.468 

 2.591 



2-595 

 2.590 

 2.637 

 2.549 

 2.531 

 2.133 

 1.828 

 1.832 



1. 840 



2. 031 

 1.778 

 2. 064 

 I. 741 



2.434 

 2.847 



3 

 3 

 3 

 3 



167 

 140 

 398 



3-3^3 

 3.209 



3-474 

 3-435 

 3-491 

 3.406 

 3-368 

 3-381 

 3-158 



Nitrogen excreted. 



In 



urine. 



O- 653 

 .580 

 . 700 

 .667 



•753 

 .724 

 .724 

 .838 

 .865 

 .790 

 .837 

 •757 

 •775 

 . 641 



•589 

 .587 

 •589 

 •748 



•659 

 .719 



•725 

 1^357 

 I. 619 



1. 189 

 1.674 

 1-754 

 1.990 



I- 951 

 1.886 



1-873 



2. 069 

 2.056 

 2. 023 

 I. 920 

 1.930 



In 

 feces. 



I. 641 

 I. 632 



1.852 



I- 738 

 I. 664 



1-579 

 1.474 



1-327 

 1.509 

 I. 466 

 1-536 

 1.498 



243 

 024 



934 

 043 

 068 



•915 

 •987 

 •944 

 I. 029 

 I. 051 

 I. 103 

 I. 091 

 I. 126 



I- 159 

 I. 104 



I- 133 

 I. 122 

 I. 160 

 1.049 

 I. 027 

 1.068 

 I. 179 

 1-037 



In 



urine 

 and 

 feces. 



2. 294 

 2. 212 



2-552 



2.405 

 2.417 

 2-303 



2. 198 

 2. 165 



2-374 

 2.256 



2-373 

 2- 255 

 2. 018 

 1.665 



I- 523 

 I. 630 



I- 657 

 1.663 

 I. 646 



1. 663 



I- 754 



2. 408 

 2. 722 

 2. 280 

 2. 800 

 2.913 



094 

 0S4 

 008 



033 

 1x8 



083 

 091 



099 



3 

 3 

 3 

 3 

 3 

 3 

 3 

 3 

 2. 967 



Bal- 

 ance. 



O. 665 

 .626 

 . 142 



■392 

 .123 

 .165 

 •393 

 •430 

 . 216 



•381 

 . 176 

 . 276 



•115 

 • 163 



•309 

 . 210 



•374 

 -115 

 .418 

 .078 

 .680 

 •439 

 •367 

 .887 

 •340 

 •485 

 .289 

 .125 

 .466 

 . 402 

 •373 

 •323 

 .277 

 .282 

 .191 



Steer 663.'' 



Nitro- 

 gen 



ingest- 

 ed. 



2-557 

 2. 612 



2-837 

 2. 542 

 2. 410 

 2. 542 

 2. 367 

 2. 292 

 2. 418 

 2.427 

 1.947 

 1.964 

 2. 115 

 2. 140 

 1-954 

 I- 313 

 I. 621 



I- 541 



1. 650 



1-785 

 1.787 

 1.686 



2. 118 

 2. 481 

 2.396 

 2. 320 

 2.683 

 2.950 



2-573 

 I. 692 



Nitrogen excreted. 



In 

 urine. 



0.491 

 •530 



•573 



• 631 



.687 



• 70s 



•745 

 •703 

 .746 

 I- 154 

 •779 

 . 620 

 .606 



•635 

 .866 



• 66s 



• 445 

 .516 

 .512 

 .634 

 . 670 



• 645 

 .886 



1.309 

 1.499 

 I. 408 

 I. 672 

 1.683 

 1-815 

 1.625 



In 

 feces. 



1.469 

 1.449 

 1-509 

 I- 571 

 1-459 

 1.427 



1-319 

 1.293 



1-233 

 I. 228 

 I. 122 



I- 154 

 1.054 

 I. 232 

 .882 

 . 690 

 .842 

 .808 

 •803 

 .798 

 .802 

 .790 

 .848 



•905 

 .746 



•695 

 .845 



.772 

 . 670 

 •551 



In 

 urine 

 and 

 feces. 



1. 960 

 1.979 



2. 082 

 2. 202 

 2. 146 

 2. 132 

 2. 064 

 1.996 

 1.979 

 2.382 

 I. 901 



1-774 

 I. 660 

 1.867 

 1.748 



1-355 

 1.287 



1. 324 



1-315 

 1.432 

 1.472 

 I- 435 

 1-734 



2. 214 

 2- 245 



2- 103 

 2-517 



2-455 



2.485 



2. 176 



Bat- 

 ance. 



597 

 683 



755 

 340 

 264 

 410 



303 

 296 



439 

 045 

 046 

 190 

 455 

 273 

 206 

 042 



334 

 217 



335 

 353 

 31S 

 251 

 384 

 267 



151 

 217 

 166 



495 

 088 



484 



a No data obtained for first and second weeks. 

 6 Removed at end of thirtieth week. 



From the curve showing the live weights of the two steers it is seen 

 that they made considerable gain during the experiment. However, 

 from the eighth to the twenty-second week they made practically no 

 gain. During this time the steers consumed from 0.40 to 0.45 pounds of 

 digestible crude protein daily per 1,000 pounds live weight. In this con- 

 nection it should be noted that 0.60 pounds of digestible crude protein 



