Sept.. 1941] PROTEIN REQUIREMENTS OF CHICKENS 9 



also increased. The exceptions to this rule, however, are in the fig- 

 ures presented for the 19 per cent meat scrap and 17 per cent mix- 

 ture groups. 



Combining groups by type of animal protein source used, the 

 mixed protein groups showed an average feed cost per dozen eggs 

 produced of 15.25 cents. This was followed by the fish meal, meat 

 scrap, and dried skimmilk groups with costs of 15.90, 16.36, and 20.94 

 cents, respectively. 



Table 6 also confirms previously reported statements to the efifect 

 that the per cent of, or type of, animal protein concentrate fed had 

 little or no effect on egg size. 



HATCHABILITY AND GIZZARD LESION STUDIES 



From December 20, 1939, to April 10, 1940 nine settings of eggs 

 were made from each of the twelve groups of experimental birds. 

 Upon the completion of each hatch and compilation of hatching rec- 

 ords on hatches 5, 6, 7, 8, and 9 all chicks were killed and examined 

 for the presence and severity of gizzard lesions. 



Table 7 presents the results of the hatchability test. The mixed 

 protein, fish meal, meat scrap, and dried skimmilk fed groups were 

 in the order named from high to low per cent hatch of fertile eggs. 

 The spread from high to low groups was 6.7 per cent. No explana- 

 tion is available for the relatively poor results secured from the 

 dried skimmilk fed groups. 



A determination of the riboflavin (Vitamin Bo or G) content of 

 the concentrates used by means of the microbiological assay of Snell 

 and Strong* showed dried skimmilk to possess 18.1, fish 8.4 and 

 meat scraps 5.8 micrograms per gram. A computation of the ribo- 



TABLE 3. SUMMARY OF FEED CONSUMPTION RECORDS IN POUNDS PER CHICK 

 FOR MEAT SCRAP AND FISH MEAL GROUPS 



Feed consumed Group Group Group Group Group Group 



1 2 3 4 5 6 



SUMMARY OF FEED CONSUMPTION RECORDS IN POUNDS PER CHICK FOR DRIED 

 SKIMMILK AND PROTEIN MIXTURE GROUPS 



Feed consumed Group Group Group Group Group Group 



7 8 9 10 11 12 



*The analyses were run by T. G. Culton and II. R. Bird, of the University of Maryland, Agr'I. 

 E.xperiment Station. 



