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Development and assessment of novel endogenous markers in commercial aquafeeds to measure apparent digestibility in large Atlantic salmon (Salmo salar) on salmon farms

Citation

Witkowski, SJ and Carter, CG and Grunenwald, M and Hadley, S and MacLeod, CKA and Townsend, AT and Adams, LR, Development and assessment of novel endogenous markers in commercial aquafeeds to measure apparent digestibility in large Atlantic salmon (Salmo salar) on salmon farms, Aquaculture, 508 pp. 192-198. ISSN 0044-8486 (2019) [Refereed Article]


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DOI: doi:10.1016/j.aquaculture.2019.05.005

Abstract

As salmon aquaculture continues to grow, understanding aquafeed conversion is imperative for making informed strategic growth planning and management decisions. Accurately measuring the apparent digestibility (AD) of commercial aquafeeds on farms requires greater understanding and method development, including the validation of one or more inert endogenous AD markers. Laboratory and commercial experiments assessed the potential of elements that naturally occur in aquafeeds as potential endogenous AD markers. Two commonly used and validated AD markers, acid insoluble ash (an endogenous marker) and ytterbium oxide (an exogenous marker) were compared using protein AD calculated from a range of endogenous elements. Using a Percentage Similarity Analysis, comparison of protein digestibility calculated with recognised AD markers demonstrated lutetium (Lu) was the most accurate endogenous AD marker. Identification of Lu as an effective endogenous AD marker in commercial salmon aquafeeds will facilitate straightforward measurement of AD under commercial conditions. This work has important application in salmon aquaculture where protein AD is fundamental to growth efficiency.

Item Details

Item Type:Refereed Article
Keywords:apparent digestibility, digestibility marker, lutetium, nitrogen, protein
Research Division:Agricultural and Veterinary Sciences
Research Group:Fisheries Sciences
Research Field:Aquaculture
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Aquaculture
Objective Field:Aquaculture Fin Fish (excl. Tuna)
UTAS Author:Witkowski, SJ (Mr Stephen Witkowski)
UTAS Author:Carter, CG (Professor Chris Carter)
UTAS Author:Grunenwald, M (Dr Martin Grunenwald)
UTAS Author:Hadley, S (Mr Scott Hadley)
UTAS Author:MacLeod, CKA (Associate Professor Catriona MacLeod)
UTAS Author:Townsend, AT (Associate Professor Ashley Townsend)
UTAS Author:Adams, LR (Dr Louise Adams)
ID Code:132549
Year Published:2019
Deposited By:Fisheries and Aquaculture
Deposited On:2019-05-12
Last Modified:2019-05-21
Downloads:0

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