1920.] 



Experiments with Dried Blood. 



269 



to use pure nitrogen-free starches for farm animals. The 

 object of the experiment was to demonstrate the use or value 

 of blood as an addition to ordinary agricultural foods. 



The composition of the offals and maize used was as follows : — 



Maize Meal. Wheat Offal. 



Water .. .. .. 12-81 .... 12-62 



Ash 1-12 4-53 



Protein (= N x 6-25) 9-37 ' .... i4'3o 



Fibre . . . . . . -60 .... 9-60 



Fats . . . . . . 3-26 .... 4-16 



Carboh5^drates . . . . 72-84 .... 55 "99 



These were supplied through the ordinary channels ; the maize 

 was of good quality, well-ground and in good condition, but the 

 offals were of somewhat inferior quality, especially in comparison 

 with pre-war standards. Different bags varied somewhat in 

 appearance, so that three were kept in use at a time and the ration 

 made up by mixing the contents to ensure as far as possible an even 

 qualit}^ from day to day. 

 The pigs were weighed at weekly intervals, and after 11 

 weeks' feeding gave the following total results : — 



Value of 



Weight at Weight at Gain or Gain or 



Lot. start. finish. Loss [—), Loss( — ). 



lb. lb. lb. I s. d. 



I. .. 381J 600 2i8i II 7 o 



II. .. 409i 406 -3i -030 



III. .. 402 J 686 283I 14 18 o 



IV. .. 415I 623 207I 10 18 o 



The pigs in Lot II. showed very little appetite, and after a 

 week or two took their ration of plain maize meal only with 

 reluctance and when pressed by hunger. As will be seen from 

 the table, they put on no weight and rather fell off in condition, 

 so that it was not considered advisable to continue the diet. 

 Lots I. and III. were continued on their diet until they weighed 

 about I cwt. (porker), so that it vvould be ascertained whether 

 the use of blood gave a greater proportion of carcass to live 

 weight than wheat offals only. 





Live 



Carcass 



Plucks. 



Entrails. 



Lot. No. 



ivcight. 



weight. 









lb. 



lb. 



lb. 



lb. 



I.-(i) .. 



120 



80 



4 



17 



I.-(ii.) .. 



I36i 



88 



6 



14 



I.— (iii.) 



I20i 



81 



5 



14 



l.-(iv.) 



120 



84 



4 



12 



III.-(i.) .. 





S5 



6 



18 



III.-(ii.) .. 



138 



93 



6 



i5i 



III.— (iii.) 





78 



4 



14 



III.— (iv.) 



108 



71 



4 



16 



III.— (vii.) 



119 



94 



5 



13 



IV.— (i.) .. 



I25J 



88 



4 



13 



IV.-(v.) .. 



121 



83 



4 



TI 



IV.— (vi.) 



124 



79 



5 



14 



