Eﬀects of dietary protein and lipid levels and DP DE-1 ratio on growth, feed utilization and hepatosomatic index of juvenile haddock, Melanogrammus aegleﬁnus L.

From National Research Council Canada

DOI	Resolve DOI: https://doi.org/10.1111/j.1365-2095.2004.00326.x
Author	Search for: Tibbetts, S. M.¹; Search for: Lall, S. P.¹; Search for: Milley, J. E.¹
Affiliation	National Research Council Canada. NRC Institute for Marine Biosciences
Format	Text, Article
Subject	greater amberjack; digestible protein; digestible energy; growth; feed efficiency; energy; gadoids; haddock; lipid; protein
Abstract	Juvenile haddock, Melanogrammus aeglefinus L. (initial weight, 13.5 ± 0.1 g) were fed practical diets containing digestible protein to digestible energy (DP DE⁻¹) ratios of 25-30 g DP MJ DE⁻¹ as-fed using three protein levels (450, 500 and 550 g kg⁻¹) each at two lipid levels (110 and 160 g kg⁻¹) for 63 days. The results showed mean weight gain and feed conversion ratio were highest for diets containing 28.5 and 30.2 g DP MJ DE⁻¹. DP DE⁻¹ ratio had no significant effect on protein efficiency ratio except at the lowest level (24.7 g DP MJ DE⁻¹) indicating a protein sparing effect of higher lipid when dietary protein is below the requirement. Haddock appears to preferentially use protein as the prime source of DE. DP DE⁻¹ ratio had little effect on apparent digestibility (AD) of protein while AD of lipid was significantly affected. Significant differences in AD of energy and organic matter were found to be inversely related to the carbohydrate level of the diet. DP DE⁻¹ ratios of 28.5 g DP MJ DE⁻¹ or lower resulted in significantly higher hepatosomatic indexes. The highest whole-body nitrogen gains and energy retention efficiencies were achieved at 28.5 and 30.2 g DP MJ DE⁻¹, whereas only slight differences in nitrogen retention efficiencies were observed. The highest levels of energy retained in the form of protein were achieved at 28.5 and 30.2 g DP MJ DE⁻¹. The diet that provided the best growth, feed utilization and digestibility with minimal HSI contained 546 g kg⁻¹ protein (513 g kg⁻¹ DP), 114 g kg⁻¹ lipid, 164 g kg⁻¹ carbohydrate, 17.0 MJ kg DE⁻¹ and a DP DE⁻¹ ratio of 30.2 g DP MJ DE⁻¹.
Publication date	2005-02-02
Terms of use	Copyright 2006 TheAuthors
In	Aquaculture Nutrition 11, no. 1 (2 February 2005): 67–76.
Language	English
Peer reviewed	Yes
NRC number	NRCC 54678 1675
NPARC number	3538469
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Record identifier	46cc1e79-f34b-4973-824b-1fbcfb30ba01
Record created	2009-03-01
Record modified	2020-04-07

Date modified:: 2026-01-13