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Titolo:
Growth and feed utilisation of rainbow trout subjected to changes in feed lipid concentrations
Autore:
Rasmussen, RS; Ostenfeld, TH; McLean, E;
Indirizzi:
Univ Aalborg, Dept Civil Engn, Aquaculture Div, DK-9000 Aalborg, Denmark Univ Aalborg Aalborg Denmark DK-9000 lture Div, DK-9000 Aalborg, Denmark
Titolo Testata:
AQUACULTURE INTERNATIONAL
fascicolo: 6, volume: 8, anno: 2000,
pagine: 531 - 542
SICI:
0967-6120(2000)8:6<531:GAFUOR>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
SALMON ONCORHYNCHUS-TSHAWYTSCHA; PROTEIN; FAT; DIET; PERFORMANCE; ADIPOSITY; MYKISS; RATIOS; SALAR;
Keywords:
feed intake; growth; protein utilisation; proximate; composition; rainbow trout (Oncorhynchus mykiss);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Rasmussen, RS Univ Aalborg, Dept Civil Engn, Aquaculture Div, Sohngaardsholmsvej 57, DK-9000 Aalborg, Denmark Univ Aalborg Sohngaardsholmsvej 57 Aalborg Denmark DK-9000
Citazione:
R.S. Rasmussen et al., "Growth and feed utilisation of rainbow trout subjected to changes in feed lipid concentrations", AQUACUL INT, 8(6), 2000, pp. 531-542

Abstract

Rainbow trout Oncorhynchus mykiss grew from 44 to 326 g in 96 days when held at similar to 12 degreesC. Fish were fed to satiation twice daily with either high (L-1: 30.8%, L-2: 31.4%) or lower-lipid feeds (C-1: 18.8%, C-2: 21.8%). Four feeding treatments were studied. Group C1C2 received feed C-1 for 43 days (days 0-43) and C-2 thereafter (days 44-96). Groups L1L2, L1C2 and C1L2 were subjected to dietary changes as indicated by the feed designations. After a short period of feed adaptation, fish ingested similar amounts of feed energy i.e., they ate less by weight of the lipid-rich (L) feeds. Feed lipid content did not affect growth but fish fed L-feed had reduced feed conversion ratio (FCR) compared to fish fed C-feed (0.731 vs. 0.773) during days 0-43 (P < 0.01). After 96 days, L1L2-fish were lower in body protein (15.8%) than the C1C2-fish (16.8%) (P < 0.01). L-feeds also tended to increase percentage lipid and reduce percentage whole body moisture and ash. A higher net protein utilisation (NPU) was recorded in fish fed L-feeds (43.6%) compared to fish fed C-feeds (38.8%) in days 0-43 (P < 0.05). This seemed to be the result of a lower protein intake rather than a protein-sparing effect of feed lipid. Above a threshold value of approximately 6.5 mg protein eaten .g body wt(m)inus 1 . day(-)1, NPU decreased.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 21:32:30