beef and hog liver combination (Diet 3). Combinations of beef liver and 

 beef lung (Diet U) and hog liver and beef lung (Diet 5) also produced 

 gains coraprable to the beef and hog liver combination. The hemoglobin 

 content of the blood was lower and the mortality significantly higher in 

 the straight lung diet indicating a possible nutritional deficiency 

 which was not reflected in the growth rate during the first 12-week 

 period. The addition of either beef liver or hog liver to beef lung 

 (Diets k and 5) appeared to correct the deficiency while still producing 

 excellent gains . From this experiment it may be concluded that beef 

 lung has a greater growth potential than beef liver and that when com- 

 bined vflth either beef or hog liver produces a diet comparable in 

 nutritional adequacy to the beef and hog liver combination. Heretofore 

 the beef and hog liver combination has been recommended as the most 

 satisfactory starting diet for blueback salmon. The results of this 

 experiment indicated that either the beef liver and beef lung or the hog 

 liver and beef lung combinations would be equally as good. 



Beef lung has an additional characteristic which recommends it as a 

 diet component. When combined with salt it produces a bound diet which 

 is equal to or better than a similar combination of hog spleen and salt. 

 Hog spleen has been one of the best-binding agents known. 



Salmon viscera at the 50 percent level in combination with hog 

 liver (Diet 6), hog liver and hog spleen (Diet 7), and tuna liver (Diet 

 12) were evaluated by comparison with other hog liver combinations ajid 

 the standard meat-viscera control (Diet 8). Hog spleen at the 10 per- 

 cent level was substituted for an equal portion of hog liver in Diet 7 to 

 produce a more tightly bound diet to improve the feeding consistency. 

 The addition of the spleen resulted in no depression of the growth rate 

 and obviously improved the feeding consistency of the diet. The salmon 

 viscera included in Diets 6 and 7 provided an impetus to the growth rate 

 significantly greater than comparable diets which included combinations 

 of hog liver with either beef liver (Diet 3) or beef lung (Diet 5)o 

 Either Diet 6 or Diet 7 produced a total gain which was equal to that of 

 the standard meat->viscera mixture. The combination of tuna liver and 

 salmon viscera (Diet 12), however, was inferior to the hog liver and 

 salmon viscera combination (Diet 6). Previous trials indicated that 

 tuna liver at the 100 percent level had an extremely low growth potential 

 but the anti-anemic factor appeared to be present. The results of the 

 present experiment confirmed these indications in that the addition of 

 tuna liver to salmon viscera definitely depressed the growth rate. 



It is significant that the hog liver plus salmon viscera (Diet 6) 

 and the hog liver - spleen - viscera (Diet 7) combinations were compara- 

 ble to the standard meat-viscera control (Diet 8). Previous trials have 

 indicitnd the possibilities of a hog liver - viscera combination, but 

 heretofor-.) thn results i:-;ve not been such as to provide conclusive proof 

 as to the nutritional adequacy of this combination. The results from 

 this experiment indicated that either the hog liver-viscera or hog liver 

 - spleen - viscera combinations were adequate diets for blueback salmon 



