Hog Spleen 



Hog spleen in combination with beef or hog liver (Table 2, Diets 

 2 and h) made no. measurable contribution to the growth of the fish in 

 excess of that made by either beef or hog liver fed separately. In the 

 case of the hog liver-hog spleen combination the final weight was 

 significantly below that of hog liver. The anemia which developed in 

 the hog liver-hog spleen fish indicates that hog spleen is inferior 

 to hog liver in its content of the anti-anemic factor. Karrick and 

 Edwards (19u8) found that hog spleen was inferior to either beef 

 liver or hog liver in its protein content. Both the vitamin assays 

 of the Cortland Laboratory (Cortland Hatchery Reports 1°UU, 19u5> 

 191*65 and 19u7) and those of Karrick and Edwards (19^8) indicate 

 that hog spleen contains a reduced amount of the B-complex vitamins 

 when compared with beef liver. The low protein content, the defic- 

 iencj r in the anti-anemic factor, and the low content of certain of 

 the B-complex vitamins, all combine to make hog spleen a rather un- 

 desirable diet component particularly since the cost per pound now 

 approximates that of either flukey beef or hog liver. Hog spleen, 

 however, is one of the best binding agents known when combined with 

 salt and for this reason can be used to advantage in minimal amounts 

 in composite diets. 



Beef Liver - Hog Liver 



A combination of equal parts of beef liver and hog liver (Table 2, 

 Diet 3) resulted in a significant increase in growth over any other 

 all-meat diet tested. As beef liver and hog liver have approximately 

 the same protein content, the acceleration in growth rate may be at- 

 tributed to the complementary nature of the proteins. 



The feeding trials conducted with all-meat diets indicate that a 

 beef liver-hog liver combination is superior in growth potential to 

 either product fed separately or when combined at the $0 per cent 

 level with hog spleen. The anti-anemic factor is present in the greatest 

 amount in beef liver and to a lesser extent in hog liver. Hog spleen 

 is inferior to either beef or hog liver in the amount of the anti-anemic 

 factor it contains. 



Fish Products 



Fish products, particularly those which are not utilized for human 

 consumption, such as the offal from canning or filleting operations or 

 undesirable fish taken incidentally in a fishery, offer a cheap source 

 of fish food. One of the objectives of the feeding trials was to evaluate 

 the growth potential and nutritional adequacjr 



13 



