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- W2128889404 abstract "This study was undertaken to define the availability of different nutrients within feed rawmaterials for the tropical species barramundi Lates calcarifer (Bloch). Availability wasmeasured as the apparent digestibility coefficient (A.D.C.) measured as the difference incomposition between feed and faeces. Feed materials investigated include blood meal, fishmeals, meat and bone meal, soy meal, soy protein meals, yeast meal, squid meal, prawnshell meal and wheat.Initial trials were conducted to determine the best method for faecal collection, includingcontinual filtration and stripping. Individual aquariums holding ten fish were connected topurpose built filtration units for the collection of faeces. Experiments one, two and fourused the method of continual filtration of faecal material to determine the apparentdigestibility 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. Nodifferences 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.sfor crude protein and crude lipid of a reference diet with faeces collected by continualfiltration and stripping. Experiment four assessed production method for diet manufacture found a significantdifference between the methods of cold extrusion and steam pelleting. Different processingtechniques of raw materials and of finished diets and their effect of apparent digestibilitycoefficient are discussed.Results from this study were used to formulate a diet for barramundi using commercialproduction techniques, for trialing with existing commercial banamundi feeds. Resultsfrom this six week trial indicated that through the use of protein and lipid A.D.C.s thereformulation of diets for barramundi can see significant savings to the barramundi farmingindustry. Growth rates and food conversion rates were comparable to existing commercialdiets but at a 'greatly reduced cost.In all experiments faecal material was collected daily, analysed and used to calculateapparent digestibility coefficients. Results are also compared with existing informationavailable on cold water species to elucidate any major differences." @default.
- W2128889404 created "2016-06-24" @default.
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- W2128889404 date "1997-01-01" @default.
- W2128889404 modified "2023-09-27" @default.
- W2128889404 title "Apparent digestibility coefficients of feed raw materials for barramundi Lates calcarifer (Bloch)" @default.
- W2128889404 hasPublicationYear "1997" @default.
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