1983 Volume 49 Issue 9 Pages 1421-1427
Microencapsulated digestive enzymes were supplemented in various combinations and levels in diets for the shrimp Penaeus japonicus based on digestive enzyme activities of live short-necked clam Venerupis philippinarum. The effects of these digestive enzyme additives on growth, feed efficiency, hepatopancreatic glycogen, and digestive enzyme aotivities were investigatred.
Dietary supplements of α-amylase at levels comparable to those of live short-necked clam enhanced the growth and reduced the glycogen storage. However, an α-amylase supplement, at a level three times that found in clam, in combinatin with bovine trypsin, equal in levels to shortnecked clam, enhanced the growth but also increased the hepatopancreatic glycogen, as did a diet supplemented with bovine trypsin alone, A diet supplemented with amylase at a level two times that of cam, enhanced the growth without increasing the hepatopancreatic glycogen. Bovine trypsin dietary supplements may have activated the endogenous protease zymogen (s) of the shrimp, resulting in increased growht and total protease activities.
