1920.] 



Experiments with Dried Blood. 



271 



on maize meal alone compare exactl}^ with those obtained by 

 the American observers who undertook the experimental work 

 of feeding maize to pigs as a comparison with maize -f casein. 



The addition of a small quantity of fresh vegetables to the 

 diet showTd a very considerable gain against an ordinary 

 ration, but their use appeared to be unnecessary when a full 

 diet of wheat offal plus blood was fed. It is, however, recog- 

 nised that this part of the experiment is tentative only and 

 requires a further trial with at least seven pigs in each lot 

 before any definite conclusions can be arrived at. 



The results are recorded, as the pigs were in such a suitable 

 condition {i.e., used to the diet) after 11 weeks of experiment 

 as to justify the trial even on two or three animals. 



The cost of dried blood is fairly high, but it must be remem- 

 bered that only a few oz. should be fed daily, or an excess of 

 nitrogen in the diet would result, and this is undesirable. 

 In these trials the total cost of the blood was as follows : — 

 I -25 cwt. blood per pen at 185. 6d. per cwt. = 235. id. per pen for 

 Expt. I. 



20 lb. blood per piq at i8s. 6d. per cwt. = 35. ^d. per pig for 

 Expt. I. 



The thanks of the writer are due to the Food Investigation 

 Board, who provided the costs of the experiment, and to 

 Professor T. B. Wood and Professor Hopkins of the Animal 

 Nutrition Institute, Cambridge University, for permission 

 to use their laboratories and Nutrition Station and also for 

 much assistance and advice. 



