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Apparent digestibility coefficients of feed raw materials for barramundi Lates calcarifer (Bloch)


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Krogh, PK 1997 , 'Apparent digestibility coefficients of feed raw materials for barramundi Lates calcarifer (Bloch)', Research Master thesis, University of Tasmania.

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This study was undertaken to define the availability of different nutrients within feed raw
materials for the tropical species barramundi Lates calcarifer (Bloch). Availability was
measured as the apparent digestibility coefficient (A.D.C.) measured as the difference in
composition between feed and faeces. Feed materials investigated include blood meal, fish
meals, meat and bone meal, soy meal, soy protein meals, yeast meal, squid meal, prawn
shell meal and wheat.
Initial trials were conducted to determine the best method for faecal collection, including
continual filtration and stripping. Individual aquariums holding ten fish were connected to
purpose built filtration units for the collection of faeces. Experiments one, two and four
used the method of continual filtration of faecal material to determine the apparent
digestibility coefficient of raw materials, using fish with a mean weight of 396.65+/- 65g.
Considerable variation was found in protein and lipid A.D.C.s for the ingredients tested.
Fish meals tested had significantly different absorption efficiencies. Experiment two assessed the effect of temperature on faecal collection chambers. No
differences were found on the nutritional parameters of crude protein and crude lipid.
Experiment three, carried out with experiment four was a practical evaluation of A.D.C.s
for crude protein and crude lipid of a reference diet with faeces collected by continual
filtration and stripping. Experiment four assessed production method for diet manufacture found a significant
difference between the methods of cold extrusion and steam pelleting. Different processing
techniques of raw materials and of finished diets and their effect of apparent digestibility
coefficient are discussed.
Results from this study were used to formulate a diet for barramundi using commercial
production techniques, for trialing with existing commercial banamundi feeds. Results
from this six week trial indicated that through the use of protein and lipid A.D.C.s the
reformulation of diets for barramundi can see significant savings to the barramundi farming
industry. Growth rates and food conversion rates were comparable to existing commercial
diets but at a 'greatly reduced cost.
In all experiments faecal material was collected daily, analysed and used to calculate
apparent digestibility coefficients. Results are also compared with existing information
available on cold water species to elucidate any major differences.

Item Type: Thesis - Research Master
Authors/Creators:Krogh, PK
Keywords: Giant perch
Copyright Information:

Copyright 1996 the author - The University is continuing to endeavour to trace the copyright owner(s) and in the meantime this item has been reproduced here in good faith. We would be pleased to hear from the copyright owner(s).

Additional Information:

Thesis (M.App.Sci.)--University of Tasmania, 1997. Includes bibliographical references

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