Nov. 4. 1918 Net Energy Values of Alfalfa Hay and Starch 



275 



Table IX. — Methane production 



Feed and period. 



ALFALFA HAY. 



Period 5 . 

 Period 6 . 

 Period 7 . 



Totals and means . 



Dry matter 

 eaten. 



Gm. 



7, 893. o 

 6,127.8 

 3, 501- 6 



17,522.4 



Methane. 



Total. 



Gm. 



173- 19 



132. 74 



79. 19 



ALFALFA HAY AND ST.\RCH. 



Period I . 

 Period 3 . 

 Period 2 . 

 Period 4 . 



Totals and means 



Totals and means, omitting period 3 



STARCH, COMPUTED, WITH MEAN FOR HAY. 



Period i , total . 

 Period I, hay . 



Period I, starch. 



Period 3 , total . . 

 Period 3, hay. . 



Period 3, starch. 



Period 2 , total . . 

 Period 2, hay . . 



Period 2, starch. 



Period 4, total . . 

 Period 4, hay . . 



Period 4, starch 



Totals and means 



Totals and means, omitting period 3 



8,821.0 

 S, 298. 8 



3> 750- 4 

 2, 480. o 



20,350.2 

 15.051-4 



8,821.0 

 6, 254. 7 



2, 566. 3 



5, 298. 8 



3. 747- 7 



1. 551- I 



3. 750- 4 



2, 645. 4 



1, 105. o 



2, 480. o 

 I, 754-0 



726. o 



5. 948. 4 

 4, 397- 3 



385- 12 



225. 14 



155- 93 

 112. 00 



83-34 



Per kilo- 

 gram of 

 dry matter 



Gm. 



21. 04 



21. 66 



22. 61 



Per 100 

 grams of 

 digested 

 carbohy- 

 drates. 



Gm. 



21. 



576- 41 

 420. 48 



225. 14 



87.66 



155- 93 

 82.37 



73-56 



112. 00 



58- 15 



53-85 



83-34 

 38.55 



44-79 



259. 86 

 186. 30 



25-52 

 29.42 

 29. 86 

 33- 60 



28.32 

 27. 04 



34- 16 



47.42 



48.73 



61. 70 



43.69 

 42.37 



5-0 



4.8 

 5.0 



4.9 



4.4 



5- I 

 5- o 

 5.6 



4.8 

 4.7 



3-6 



5-2 



5-1 



6-3 



4.6 

 4-4 



METABOLIZABLE ENERGY 

 By metabolizable energy is understood the total chemical energy 

 of the feed, as measured by its heat of combustion, minus the chem- 

 ical energy lost in the feces, urine, and combustible gases. In other 

 words, it is the amount of energy capable of conversion into other forms 

 in the body. Correcting the observed energy of the urine to a state of 

 nitrogen equilibrium ^ the following results (Table X) may be computed 

 as in the case of digestibility. Averages have also been computed omit- 

 ting the results of period 3. 



' By adding 7.45 Calorics for each gram of nitrogen retained by the animal or subtracting the same amount 

 or each gram of body nitrogen lost, the correction being regarded as representing energy of excretory mate- 

 rial temporarily retained in the body. 

 83814°— 18 2 



