1909.] 



PUBLIC DOCUMENT — No. 31. 



153 



bolic by-products. Judging from the digestibility of the total 

 dry matter of the blood it may be safely concluded that the blood 

 protein must be quite thoroughly utilized by farm animals. 

 Kellner^ found the protein in blood meal to be 92 per cent, 

 digested; Wildt^ secured protein coefficients of from 01 to 72 

 per cent, on samples of blood which had been overheated. 



(3) Blood Meal v. Cotton-seed Meal for Dairy Cows. 



Object of the Experiment. ■ — To compare the total protein of 

 dried blood with an equal amount of protein in cotton-seed meal 

 upon the yield of milk and milk ingredients, and to note its 

 economy and suitability as a protein concentrate for dairy stock. 



Plan of the Experiment. — Four cows, Blanche, Brighty, 

 Dora and May, were divided into two lots and fed by the usual 

 reversal method. The care and weighing of the animals, method 

 of feeding and sampling of milk were the same as in the alfalfa 

 meal experiment (pages 158-166). 



It will be seen that the experiment proper lasted four weeks, 

 with an interval of seven days between the two halves. 



• Already cited. 



2 Landw. Jahrbiicher 6 Bd., 1877, p. 177. 



