hog spleen, 30 percent salmon eggs, and 10 percent of vacuun- dried salri.on vis- 

 cera meal, ^iet 13 consisted of 27 percent each of beef liver, hog liver, and 

 salmon eggs, 9 percent of salmon milt, and li^ percent of vacuum-dried salmon 

 viscera meal. The next highest rate of growth WdS produced by Diets 3 and 9. 

 ^iet 3 consisted of beef liver, hog liver, hog spleen at 20 percent each, sal- 

 mon viscera at 30 percent, and vacuum-dried sal.non viscera meal at 10 percent. 

 Diet 9 consisted of 30 percent each of beef liver, bog liver, and salmon viscera, 

 and 10 percent vacuum-dried salmon viscera meal. Follo',^dng Diets 3 and 9 was 

 Diet 11, which consisted of 2? percent each of beef liver, hog liver, and salmon 

 viscera, and 10 percent salmon milt. 



In summarj'- of these recommended diets, the greatest gains irere attained 

 with the meat-egg mixtures, the next greatest gains with the meat-viscera mix- 

 tures, and least ga'^n with high-level salmon viscera diets. 



RESULTS OF SECOND EXPERIMENT 



The results of the second experiment are siiinmarized in Table 2. 



Beef ■'-'iver Control 



As in the first experiment, the beef liver control was included in 

 order to make comparisons with results of other investigations in which a beef 

 liver control was included and to make comparisons with the diets in this 

 experiment. 



The final mean weight of the beef liver control of the second experi- 

 ment (Table 2, Diet 19) was relatively low in comparison with most of the com- 

 posite diets. This relative standing was, of course, to be expected since this 

 was a warm water experi.-aent. The comparisons of the beef liver diet with single 

 raw component diets showed that beef liver was a superior diet to whole cod, 

 equal to halibut sawdust, and inferior to fresh-frozen salmon eggs. This last 

 comparison confirmed the results of the warm-water section of the I9I49 trials. 



Meat-Vise era-Meal Control 



The meat-viscera-raeal control (Table 2, Jiet lj6) sf-rved as a measure 

 of the composite diets. The components of this control diet were: 20 percent each 

 bf-beef liver, hog liver,, and hog ; spleen, 30tpercent salmon viscera, and because 

 the experiment was conducted during a warm-water period, 10 percent of vacuum- 

 dried salmon viscera meal. 



Comparisons of final mean weights demonstrated that the meat-viscera- 

 meal control usually produced significantly smaller gains than the comparable 

 diets which included salmon eggs. Similar results were attained x/ith the meat- 

 viscera-meal mixture when halibut sawdust was substituted for hog spleen and 

 when tuna liver was substituted for beef liver. This diet resulted in signif- 

 icantly greater gains than the diets testing hake or whole cod as a substitute 

 for hog spleen, or the diet testing air-lift dried mackerel offal meal as a 

 substitute for vacuum.-dried salmon viscera meal. 



11 



