146 



Journal of Agricultural Research 



Vol. XXII, No. 3 



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 S 100 



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Fig. 8.— Graph show- 

 ing bad results from 

 lack of roughage in 

 ration of 65 parts 

 yellow com, 15 parts 

 gelatin, 5 parts but- 

 ter fat, 5 parts ash 

 mixture, and 10 

 parts starch for 

 chicks of lot 217. 

 The time at which 

 chick died is indi- 

 cated by X. 



(2) Yellow corn is deficient in quality and quantity of protein required 

 for normal growth of chicks. The addition of more com protein by 

 including corn gluten in the ration did not markedly 

 improve the efficiency of the ration. Compare growth 

 curves, lots 208 and 211. 



(3) The addition of 15 per cent purified casein to a 

 basal ration of yellow corn and ash did improve the 

 ration decidedly. Compare growth curves, lots 211 and 

 213. The amino acid deficiencies of the corn proteins 

 are no doubt supplemented by the amino acid contribu- 

 tions of the casein. 



(4) Supplementing the basal yellow com ration with 

 certain other proteins, ^^g albumen, and gelatin, lowered 

 rather than raised the efficiency of the ration. The poor 

 results with rations 217 and 218 were probably due to 

 a distinctly sticky physical quality which prevented 

 normal nutrition. 



(5) The fat-soluble food accessory does not appear to 

 be a limiting factor in a yellow com diet for baby 

 chicks. The addition of butter 

 fat to a yellow corn, casein, 



and ash ration (lot 215) did not improve but 

 rather lowered the efficiency of the ration. A 

 slight change in the physical condition of the 

 ration may explain this lowered efficiency, 

 though it is more probable that the butter fat 

 addition temporarily stimulated growth so that 

 the supply of some other essential accessory 

 was exhausted earlier than would have been 

 the case had the butter fat been omitted. It 

 is apparent at least that the failure of chicks 

 on ration 215 was not due to fat-soluble A 

 starvation. 



(6) Green feeds make certain very valuable 

 contributions to a ration for growdng chicks. 

 The addition of wheat greens to a yellow com, 

 casein, and ash ration effected a decided im- 

 provement in the efficiency of the ration. An 

 excess of the wheat greens was offered, and 

 subsequent observations indicate that about 5 

 per cent (dry matter basis) of this kind of green 

 food are consumed when offered regularly in excess. The helpful influ- 

 ence of the wheat greens may have been due to, first, an improvement 

 of the physical condition of the ration; second, a food accessory con- 



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Fig. 9.— Graph showing that be- 

 cause proper physical quality 

 was lacking the addition of 15 

 parts egg albumen did not im- 

 prove ration of 65 parts yellow 

 com, 5 parts butter fat, s parts 

 ash mixture, and 10 parts starch 

 for chicks of lot 218. The time 

 at which chicks died is indi- 

 cated by X. 



