CALCULATION OF THE MONEY VALUE OF FEEDING STUFFS 129 



grade material. Necessary requirements for these biscuits are that thej 

 serve the purpose of complete rations for dogs and that they be whole- 

 some. Dog biscuits put on the market during and after the war fre- 

 quently contained substances indigestible for carnivora, such as chaff, 

 hay, seed hulls, leaves, sawdust, bran refuse, excessive amounts of salts 

 in the form of carbonate of lime, ground and cracked bone, etc. Dogs 

 nourished on these products for any length of time inevitably suffer in 

 health (Hanslian). 



XII. Calculation of the Money Value of Feeding Stuffs 



In the preface of this work attention was directed to the necessity of utilizing every 

 possible home product for feeding purposes. Whenever possible, low-priced feed- 

 ing stufifs should be used to replace expensive material. Production expense should 

 be reduced to the minimum. Feeding rations should be accurately adjusted to the 

 requirements of each individual animal. The least deficiency, or the least excess, 

 should alike be regarded as unnecessary waste of material. 



The market prices of many feeding stufifs ofifered to the public are far from 

 being commensurate to their actual value. This is true in both senses of the 

 word. While the content of digestible nutrients was formerly used as the sole basis 

 in calculating the money value of feeding stuffs, Kellner has demonstrated the 

 error of this method. A more accurate method consists in using the starch value 

 of a given feed, with due consideration of the digestible albumen content, as a basis 

 for calculation. In addition, the following points should be considered, viz. : agree- 

 ableness, keeping quality, value of the resulting manure, and the expense of trans- 

 portation, storage and preparation. 



According to estimates made on the basis of average prices for 1907 and 1908, 

 the value of 1 kg. of digestible albumen is 26 pfennigs, and of 1 kg. starch value 

 nearly 20 pfennigs (3J4 and 2J^ cents per pound, respectively). To estimate the 

 actual value of a feeding stuff according to these values, multiply the starch value 

 of 100 pounds of the feeding stuff in question by 2^ cents, and add to this the 

 product obtained from the figure indicating the digestible albumen content in 100 kg. 

 or 100 pounds respectivelj-. Thus, 3% minus 2J/2 equals }i cent; or, to reduce to 

 decimals, 3.25 minus 2.50 equals 0.75. 



For example : Oats contain 7.2 per cent digestible albumen and a starch value 

 of 59.7 per cent The value of 100 pounds is estimated as follows: 



59.7 times 2.5 cents equals $1.4925 

 7.2 times 0.75 cents equals 0.54 



Total $2.0325 



According to the rules adopted by the Association of German Experiment Sta- 

 tions, the money value of feeding stuffs may be estimated by multiplying the protein- 

 and fat contents by 2, the nitrogen-free extract content by 1, adding the three prod- 

 ucts thus obtained and dividing the price of the feeding stuff by the sum. The 

 quotient will be the price unit of the feeding stuff in question. 



Example for estimating the price unit of peanut cake containing 45.5 per cent 

 protein, 7.5 per cent fat and 25.6 per cent nitrogen-free extract, the market price 

 being $1.88 per 100 pounds: 



Protein 45.5 by 2= 91.0 



Fat 7.5 by 2= 15.0 



Nitrogen-free extract 25.6 by 1 = 25.6 



Total 131.6 



1.88 



Dividing the price $1.88 bv 131.6= $0.1444-=Price unit. 



131.6 



With the price unit in our possession, the trade allowance or rebate due from the 

 merchant is easily calculated according to the instructions given on page 130. 



