CHEMICAL COMPOSITION OF MAIZE GRAIN 667 



The average protein-content of all samples was 10-20 per cent, CHAP, 

 and twenty -two samples ranged from 8-i to n| per cent with XIIL 

 the mode at 94 to \o\ per cent, as follows: — 



8 ■ - 8| per cent = 1 sample 



8J - 94 .1 =6 samples 



9-J-10J ,, = 11 



I0 i- rl i .. = 5 



11J-12A ,, = 2 



12J - 13 ,, = 2 ,, 



It is also clear that variation in protein percentage depends 

 on the breed rather than on the locality, the range of variation 

 in protein-content of maize of different breeds grown on the 

 same farm extending to 1-5 per cent; between two different 

 breeds both grown at Leeuwdoorns there was a difference of 

 211 per cent protein. The difference between samples of the 

 same breed grown in the one case at Richmond, Natal, and in 

 the other case on the Transvaal High-veld, is only -44 per cent. 



As compared with the United States, a sample of Wills 

 Gehu grown in the Pretoria District shows an increase of -44 

 per cent protein over the original sample imported from the 

 breeder in the United States (but the imported grain was 

 more than a year old). 



622. Relative Feeding-value of Maize, Wheat, and Other 

 Cereals. — According to the Bureau of Chemistry of the United 

 States Department of Agriculture (U.S.D.A., 9), the same 

 amount of digestible matter in wheat and in maize is pur- 

 chased for the same amount of money when both are selling 

 at the same price per bushel. The maize would yield 2-\ lbs. 

 more carbohydrates than the wheat, and the wheat 2-J- lbs. 

 more protein than the maize. 



As compared with wheat, maize is rich in starch and fat 

 and low in protein-content As compared with rice it is richer 

 in protein and fat, but contains much less starch. The follow- 

 ing table (CX) taken mainly from Church (1), shows the 

 relative chemical composition of the principal cereals of the 

 world : — 



