Oct. IS. 1921 Inf,uence of Plane Nutrition on Maintenance 



119 



used in computing tlie energy intake on the basis of digestible organic 

 matter consumed. By use of the factors in Table IV, the weight in 

 pounds of digestible organic matter in the mixed ration was determined 

 for each period. This was multiplied by 1.588, the Armsby factor for 

 metabolizable energy in a pound of digestible organic matter from hay. 

 The thermal value of digestible organic matter from grain is 1.769, 

 however, or 0.181 therms more. Therefore, each pound of digestible 

 organic matter derived from grain was multiplied by 0.181, and the 

 product was added to the result obtained by multiplying the total 

 digestible organic matter by 1.588. This gave the total metabolizable 

 energy in both the hay and grain. The digestibility of the organic 

 matter of the grain was estimated by difference. This ranged closely 

 around 80 per cent. The factors for energy expenditure are given in 

 Table III. 



It seemed impracticable to calculate the net energy of the milk con- 

 sumed on the basis of digestible organic matter, so the calculation was 

 based on the quantity consumed, as previously described. Since the 

 amount was small, however, the method of calculation would have 

 little effect on the final result. [i;i> 0. 



The method used in correcting for changes in body weight has already 

 been described, and the maintenance requirement as calculated on the 

 basis of digestible organic matter consumed is given in Table V. 



Table v.- 



-Average daily maintenance requirement, as calculated front digestible organic 

 matter consumed 



In determining the maintenance requirement on the basis of digestible 

 organic matter, the calculations were based on digestion coefficients ob- 

 tained at this Station under similar conditions. This method is probably 

 more accurate than that of calculation on the basis of dry matter con- 

 sumed, and for the animals concerned it gives a result about lo per cent 

 higher. 



