1917] 



ANIMAL PRODUCTION. 



865 



talbumin again was superior, it talking 50 per cent more of casein and nearly 

 90 per cent more edestin to produce the same gain. With a lactalbumin food 

 containing 8 per cent it took 12 per cent of casein and 15 per cent of edestin to 

 produce the same gain in weight. The replacement of cystin by alanin in the 

 ration with casein failed to bring about a nutritive advantage. In mature ani- 

 mals where maintenance requirements and not growth are to be met, the results 

 with the different proteins are not so marked. 



Further experiments were made in which the three proteins were fed daily 

 in such a way that no essential gain or loss in body weight occurred. The total 

 energy intake was made sufficiently liberal, the protein only being kept at the 

 minimum. The results corroborate the former conclusions as to the compara- 

 tive superiority of lactalbumin when fed with the other two proteins in minimum 

 amounts. 



The efiEect of the amino acid content of the diet on the growth of chickens, 

 T. B. OsBOBNE, L. B. Mendel, et al. (Jour. Biol. Chem., 26 {1916), No. 2, pp. 

 293-SOO, pi. 1). — Experiments by the authors with rats have shown the im- 

 portance of certain amino acids for growth, notably tryptophane, lysin, and 

 cystin. Similar work by Buckner. Nollau, and Kastle (E. S. R., 34, p. 871) with 

 chickens is noted. Further work was carried on with chickens, using foods 

 similar to those employed with rats. 



The results with chickens were found in accord with those obtained in the 

 experiment with rats. Lactalbumin, rich in both tryptophane and lysin, proved 

 to be an efficient adjunct to the proteins of corn gluten. 



The productive values of some Texas feeding' stuffs, G. S. Fkaps (Texas 

 Sta. Bui. 203 (1916), pp. 5-42). — These experiments were conducted in the same 

 manner as those previously noted (E. S. R., 27, p. 6G8 ; 31, p. 862). The coeffi- 

 cients of digestibility and productive values as determined on sheep are shown 

 in the following table : 



Average coefficients of digestibility of feeding stuffs and productive values. 



Feeding staS. 



Pro- 

 tein. 



Ether 



ex- 

 tract. 



Cnide 

 fiber. 



Nitro- 

 gen- 

 free ex- 

 tract. 



Ash. 



Produc- 

 tive 



value. 



AcuS sorghum forage 



Com chop, Argentine , 



Com silage , 



Cotton seed , 



Dolichos lablah hay 



Feterita seed 



Feterita fodder 



Jack bean, chopped , 



Kafir stover , 



Kafir fodder , 



Milo head chop, average 



Milo stover 



Milo fodder , 



Moth bean hay , 



Peanuts, whole, average , 



Peanut bulls 



Peanut hay with nuts, average. . . 

 Peanut hay without nuts, average 



Peat 



Prairie hay, average 



Rhodes grass hay , 



Rough rice, ground, average 



Rice hay 



Shallu stover 



Sorghum silage, average 



Sorghum fodder, average 



Sorghum forage 



Sorghum hay 



Sadkn hay, average 



Sudan straw 



Wheat shorts 



Per ct. 

 9.1 

 86.3 

 59.2 

 79.5 

 72.3 

 90.0 

 50.1 

 89.6 

 18.2 

 62.4 

 75.6 





 38.1 

 67.1 

 80.8 

 62.2 

 75.8 

 64.0 





 10.8 

 43.8 

 75.6 

 37.8 









 38.0 

 9.1 

 38.2 

 49.4 

 45.9 

 92.1 



Perct. 

 37.1 

 91.3 

 69.4 

 96.3 

 52.0 

 74.5 

 58.7 

 81.6 

 47.6 

 66.4 

 86.7 

 56.6 

 70.9 

 10.8 

 93.3 

 95.9 

 92.0 

 63.8 

 100.0 

 42.0 

 45.3 

 76.1 

 56.0 

 32.3 

 56.0 

 65.0 

 37.1 

 62.0 

 54.0 

 34.5 

 86.7 



Perct. 

 58.2 

 92.4 

 74.7 

 52.5 

 54.7 

 50.0 

 66.3 

 80.2 

 48.6 

 68.8 

 51.7 

 65.8 

 72.0 

 52.3 

 34.4 

 16.4 

 47.9 

 49.6 

 

 58.4 

 67.9 

 10.4 

 51.3 

 64.7 

 5a 

 61.0 

 58.2 

 62.2 

 61.2 

 60.0 

 50.0 



Per ct. 

 45.6 

 97.9 

 76.3 

 68.1 

 64.6 

 96.6 

 60.9 

 96.8 

 46.3 

 69.8 

 90.8 

 49.2 

 78.2 

 64.9 

 12.8 

 57.6 

 68.3 

 75.5 

 

 51.8 

 58.0 

 90.6 

 47.6 

 50.4 

 64.0 

 63.0 

 45.6 

 63.0 

 52.9 

 47.7 

 98.5 



Perct. 



1.4 

 99.4 

 43.8 

 58.4 

 26.5 

 89.0 

 29.2 

 89.6 

 

 37.2 

 30.9 

 

 51.6 



6.3 

 



6.8 

 37.1 

 29.6 



1.6 



9.4 

 27.9 



7.7 



49.2 

 4.0 

 4.0 

 1.4 



28.4 



24.8 

 6.8 



35.5 



Lbs. 

 5.3 



22.4 

 3.8 



18.1 

 8.3 



21.2 

 8.2 



19.6 

 5.4 



10.3 



18.6 

 6.8 



13.6 

 8.3 



22.7 

 1.5 



15.6 



10.7 

 .4 

 7.1 

 8.2 



15.9 

 5.4 

 6.7 

 2.6 

 9.4 

 5.3 

 8.9 

 7.4 

 6.8 



21.9 



