22 



Bulletin 304 



the grain was weighed for a lot and then averaged for the individuals. 

 The hay was weighed for all the calves and then averaged for each calf 

 according to his age. The milk and gruel of all kinds was weighed for 

 each individual calf at each feed. 



In computing the cost of feed for each calf, the same prices were charged 

 for each food in 1908-9 as in 1907-8, in order to make comparisons more 

 uniform. 



In 1907-8, some of the calves were troubled with scours. In order 

 to avoid this trouble, about one tablcspoonfui of blood flour was mixed 

 with each feed for each calf. The blood flour is sold by Swift and Com- 

 pany of Chicago, and under the name " Soluble Blood Flour." The 

 manufacturers state that this material, which is a by-product from the 



Fig. 7a. — Calf No. 24, lot D, at 5 months of 

 age (see Fig. 7) 



Fig. 8a. — Showing calf 24, lot D, Fig. "ja. at 

 two years of age 



abattoirs, will prevent scours. It is sold for $1.50 per hundredweight, 

 and since the cost was so small no account has been taken of the cost 

 of the amount used. The effect of the blood flour on the digestion was 

 good, keeping the calves in good condition. The manufacturers state 

 that this blood flour contains 47% protein, so that as a food its effect 

 would be good on growing calves; but in this experiment it was not in- 

 tended as a food but for the control of digestive troubles. 



The amounts of food eaten by the different lots of calves, together 

 with the cost of feed, total gain, and the cost of one pound of gain, are 

 given below for each group. The amounts of feed were kept for each 

 day's feeding, the totals were added at the end of each month, and the 

 sum of these totals for the five months from birth for each calf is given 

 in the tables. 



