191 1.] Starch Equivalents of Feeding Stuffs. 731 



value of true protein; and, secondly, the "availability" or 

 "value" of the food must be considered. If the nutrients in 

 the food are not full value (see p. 726) then the correspond- 

 ing deduction must be made. Suppose, for example, that 

 the starch value of cocoanut cake is found to be 76*5, as 

 shown below, then the starch value requires no change to 

 be made in it, for the nutrients are full value. When, how- 

 ever, oats are considered, the calculated starch equivalent 

 has to undergo a deduction, because it has been shown that 

 the nutrients in oats are not so highly available as those in 

 linseed cake. In other words, whilst linseed cake is given 

 the full value of 100, oats only receive 95. An example will 

 make this clear; thus, taking oats to contain 9 per cent, of 

 digestible protein, 5*25 per cent, of digestible oil, and 45 per 

 cent, of digestible carbohydrates and crude fibre, and using 

 the figures given above for the calculation of starch equiva- 

 lents, we get : — 



9 per cent, protein x 0*94 = 8 "46 starch equivalent. 



5-25 oil X2-I2 = H'23 

 45 carbohydrates 



+ crude fibre x 1 *oo = 45 "00 , , 



64-69 



As the availability of food nutrients would only be 95 per 

 cent., then 64*69 x T %%=62 for starch equivalent. 



The figures representing the starch equivalent are included 

 in the tables which are to be found in Kellner's books, the 

 translation of the smaller of which has been published by 

 Messrs. Duckworth and Co. under the title of "The Scien- 

 tific Feeding of Animals." Some of the common feeding 

 stuffs have starch equivalents as under: — 



Starch Equivalents of Certain Foods. 



Linseed cake ... 

 Decort. cotton cake ... 

 Undecort. ,, ,, 

 Soya bean ,-, 

 Cocoanut 

 Sesame 



Gluten meal ... 

 Dried brewers' grains 

 Wet 



Oats 



Barley... 

 Maize ... 



Beans ... ... ... 



Peas ... 

 Meadow hay ... 

 Clover ,, 



lb, 





lb. 



71-8 



Pasture grass 



12 



72-3 



Red clover (young) 



10 



39 "2 



„ (old) 



97 



68 



Lucerne (according to age) 



8-4—9-1 



76-5 



Wheat straw ... 



12 



7i 



Oat „ 



.. 17 



77 



Barley 



19 



50'3 



Bean 



19 



127 



Pea „ ... ... i 



l6*2 



63 



Mangolds 



7 



74 



Turnips... 



4-6 



82-9 



Potatoes 



19 



67 



Cows' milk 



H7 



68 6 



Whey 



6-4 



3i 







3i 







