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Optimising the nutrient specifications of manufactured feeds for farmed juvenile greenlip abalone (Haliotis laevigata Donovan)

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Coote, Thomas Albert (1998) Optimising the nutrient specifications of manufactured feeds for farmed juvenile greenlip abalone (Haliotis laevigata Donovan). PhD thesis, University of Tasmania.

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Abstract

A series of experiments were conducted to investigate the protein, energy and
lysine requirements of greenlip abalone Haliotis laevigata. An initial experiment
estimated the optimal crude protein requirement. Digestibility coefficients of the protein
and energy components of feed ingredients were then estimated and used to formulate
diets to investigate the optimal dietary ratio of digestible protein to digestible energy and
the effect these parameters have on tissue quality in abalone. Finally, the lysine
requirement of greenlip abalone was estimated using two methods of lysine
supplementation.
The first experiment involved feeding a series of semi-purified diets in which the
essential amino acid profile was similar to that of the soft tissue of abalone. Abalone
grew fastest at a crude protein level of 20.1%. Excess dietary protein reduced the
growth rate. The optimal digestible protein:digestible energy ratio was estimated at 14.4
gDP.M.VDE. Leaching of essential amino acids over 24 hours immersion ranged from
26-54%. The apparent and true digestibility coefficients of the protein and energy
components of five feedstuffs were estimated. Defatted soyflour provided the most
digestible protein (96.7% digestible). Pre-gelled starch provided the most digestible
energy (80.6%). Cost analysis indicated that defatted soyflour was the most costeffective
source of protein and energy of the feedstuffs studied.
In a factorial experiment, abalone were fed diets at ten levels of protein and two
levels of energy. The optimal dietary digestible protein level was estimated at only
13%, and the optimal ratio of digestible protein:digestible energy between 12.3-17.9 g.M.J. Abalone grew poorly on diets with fish oil levels of 6.0 - 9.0%, although their
growth rate increased when returned to a commercial diet containing less oil. The
composition of abalone foot muscle and, to a lesser extent, viscera, was affected by
dietary protein level and, in some cases, by dietary energy level. Carcass partitioning
revealed that meat yield was also affected by dietary protein level.
The lysine requirement of greenlip abalone was determined using two methods
of lysine supplementation; the addition of free L-lysine-hydrochloride to diets and the
use of gluten enriched with covalently-bound lysine. Abalone showed a linear response
to free-lysine, and a curvilinear response to covalently-bound lysine. The former
method was therefore unable to produce an estimate of dietary lysine requirement. Use
of covalently-bound lysine predicted that maximal growth occurred when lysine
accounted for 3.9% of crude protein.

Item Type: Thesis (PhD)
Keywords: Abalones, Abalone culture, Abalones
Copyright Holders: The Author
Additional Information:

Embargoed until 19/5/2004. Thesis (Ph.D)--University of Tasmania, 1999. Includes bibliographical references

Date Deposited: 25 Nov 2014 00:49
Last Modified: 11 Mar 2016 05:55
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