6o4 



Journal of Agricultural Research 



Vol. X, No. 13 



Table VIII. — Percentage digestibility of rations and of grain 



Animal and constituent. 



Steer D (hominy- 

 feed): 



Dry matter 



Ash 



Organic matter. 



Protein 



Crude fiber 



Nitrogen-free 

 extract 



Ether extract . . . 



Total nitrogen . . 



Carbon 



Energy 



Steer G(maize meal): 



Dry matter 



Ash 



Organic matter . 



Protein 



Crude fiber 



N i t r o g en -free 

 extract 



Ether extract . . . 



Total nitrogen . . 



Carbon 



Energy 



Hay. 



Period I. Period 4. Periods. Average 



55-96 

 40. 79 



57-09 

 44- 38 

 52.09 



62. 96 

 56-38 

 49. 10 

 52.98 

 52.80 



59-23 

 51.44 

 60. 54 

 48.56 

 56.91 



64. 02 



58-35 

 52- 53 

 57-21 

 56.61 



60.58 



34- 72 

 62. 32 



59-29 

 59-31 



66. 57 

 56.90 

 53-35 

 58-52 

 58-17 



60. 06 

 37-05 



61. 60 

 50. 72 

 59-36 



66. 26 



55-35 

 49-73 

 57-61 



57-24 



72 



58 



76 



52 



65 



54 



44 

 13 

 89 

 76 



72 



09 

 41 

 34 



75 



Mixed hay and | Computed diges- 

 grain. tibility of grain. 



Period 2. Periods. Period 2. Period 3 



72.71 



30-79 

 74.89 



55- 73 



61. 09 



81. 40 

 88. 50 



58-54 

 72.65 



72-35 



80. 72 



27- 23 

 82.62 

 63. 22 

 65- 13 



88. 90 



85-13 



62. 71 

 80.61 

 79.98 



72.42 

 43- 42 

 73-97 

 59.01 



54-92 



80.93 

 87.27 

 64. 06 

 71.91 

 71. 60 



72-73 

 36. 22 

 74.06 

 55-57 

 51-15 



80. 90 

 80.15 

 56-32 



72-37 

 71- 56 



87.56 

 II. 09 

 89.83 

 63.04 

 loi. 94 



91.97 



96-47 

 66.25 



89-33 

 88.52 



91.63 



— II. 90 



93. 16 



71. 06 



105. 80 



95-91 

 90.87 

 68.98 

 92-35 

 91-55 



14. 92 



85-54 

 85- 53 

 59- 22 

 79-82 

 78.96 



The average percentage digestibility of the hay, as computed from the 

 aggregate feed and excreta of the three periods, did not differ as between 

 the two animals to a greater extent than is often the case. The differences 

 as regards dry matter, organic matter, and energy are about 2 per cent, 

 for nitrogen about i per cent, for crude fiber about 3 per cent, and for the 

 remaining ingredients less than i per cent. 



The heavier hay and grain rations of period 3 as compared with the 

 lighter ones of period 2 show a slight decrease of digestibility in the case 

 of steer D (on hominy feed), and a decided decrease with steer G (on 

 maize meal). In the latter case it is to be noted that the difference in 

 the quantity consumed was also greater than with steer D and that the 

 ratio of grain to hay was also greater. 



METABOLIZABLE ENERGY 



The data obtained regarding the amount of chemical energy escaping 

 in feces, urine, and methane, and the metabolizable energy remaining 

 have already been published (2), but the principal results are repeated 

 in Table IX for convenience. 



