SUMMA.RY OF FIRST AND SECOND EXPERIMENTS 



First Experiment 



The results of the firet experiment, conducted for 2ii weeks during 

 periods of both cold and warm water, may be summarized as follows: 



lo The mean lot weight of the beef liver control during the cold- 

 water period was significantly inferior to the weights produced by most 

 of the diets in the first experiment, 



2, Hog spleen may be deleted from the meat-viscera mixture of 2?. 2 per- 

 cent each of beef liver, hog liver, and hog spleen, and 33-h percent salmon, 

 viscera. The diet without spleen which consisted of equal parts of beef liver, 

 hog liver, and salmon viscera produced results comparable to those of the meat- 

 viscera mixture. 



3. Crab meal, at the $ percent level, had no effect on growth or mor- 

 tality in the meat-viscera mixture during the cold-water period. During the 

 warm-water period, crab meal in combination with vacuum-dried salmon viscera 

 meal in this same meat-viscera mixture resulted in a growth stimulus inferior 

 to salmon meal alone. 



It. Salmon eggs, when substituted for salrao n viscera in the meat -viscera 

 mixture produced more growth than salmon viscera during; either cold or warm- 

 water periods. Salmon eggs, when substituted for salmon viscera in a diet of 

 30 percent each of beef liver, hog liver, and salmon viscera, and 10 percent 

 of salmon milt, did not exceed the gain produced by salmon viscera during the 

 cold-water periodj but during the Wt^rm-water period, salmon eggs again proved 

 superior, 



5o Salmon milt at the 10 percent level did not reduce the growth rate 

 produced by a diet of equal parts of beef liver, hog liver, and salmon viscera. 

 However, a diet with both salmon eggs and salmon milt caused an increased mor- 

 tality and a reduced growth rate during the cold-water period. During the Warm- 

 water period, the growth response to this diet was excellent. 



6o Vacuum-dried salmon viscera meal when added at the 10 percent level 

 gave growth increases up to 50 percent greater than comparable diet s without 

 meal during the warm-water period. Also it was found that the amount of increase 

 varied greatly with the diet used. 



7o The experiments with high-level salmon viscera diets showed that these 

 diets produced a growth response inferior to that of diets with hi^'her levels 

 of beef and hog liver. The supplementation with yeast proved valueless in these 

 high-level salmon viscera diets. It also was found that either beef liver or 

 hog liver provided comparable results when used in the high-level salinon viscera 

 diets, 



8, Of the diets recommended for production use on the basis of comparative 

 growth rates, the combination diets containing 33 percent or less of salmon eggs 



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