Effect of Dietary Fat Source on the Digestibility of Fat and Fatty Acids in Rainbow Trout and Mink

Austreng, Erland; Skrede, Anders; Eldegard, Åshild

doi:10.1080/00015127909435220

Cited by 95 publications

(46 citation statements)

References 16 publications

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“…Apparent digestibility coefficients for protein, fat and energy were all above 90%, and did not vary significantly among treatments. The dietary lipid source is known to affect digestibility (Austreng et al 1979), however, in this study, the apparent digestibility coefficients (ADC) of lipids were very high (99%), regardless of dietary soybean oil level, suggesting that Table 4. Whole body composition of sea bass and rainbow trout juveniles fed on diet A, B and C (0, 25 and 50% soybean oil added, respectively), for 12 weeks (mean±standard deviation, n=3).…”

Section: Adc (%) Dietmentioning

confidence: 72%

Growth, digestibility and nutrient utilization of rainbow trout (Oncorhynchus mykiss) and European sea bass (Dicentrarchus labrax) juveniles fed different dietary soybean oil levels

et al. 2005

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A shortage of marine raw ingredients, such as fish oil, is predicted in the near future. The use of suitable alternative lipid sources, such as vegetable oils, is crucial for sustainable growth of the aquaculture sector. Three isonitrogenous (50% Crude Protein) and isoenergetic (19 kJ g )1 ) diets, in which fish oil was gradually replaced by soybean oil (0, 25 and 50% of the oil fraction) were tested for 12 weeks, using European sea bass (Dicentrarchus labrax) and rainbow trout (Oncorhynchus mykiss) juveniles. No dietary effects (p>0.05) on growth performance, feed conversion, digestibility or body composition were observed with either species. The results obtained suggest the inclusion of soybean oil up to 50% of the dietary lipid is possible, in diets for sea bass and/or rainbow trout juveniles.

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Section: Adc (%) Dietmentioning

confidence: 72%

Growth, digestibility and nutrient utilization of rainbow trout (Oncorhynchus mykiss) and European sea bass (Dicentrarchus labrax) juveniles fed different dietary soybean oil levels

et al. 2005

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“…Zooplankton lipids appear to be well digested by both rainbow trout (95.8%) and herring, Clupea harengus, (99.4%) (Sargent et af., 1979). More detailed studies carried out with carp and rainbow trout have demonstrated that digestibility of fat declines with increased level of ' (1972) hydrogenation and as the melting point of the fat increases (Austreng et al, 1979;Takeuchi et al, 1979b). This depression in digestibility was more marked in small fish (Takeuchi et al, 1979b) but did not appear to be influenced by water temperature (Austreng et al, 1979;Takeuchi et al, 1979b).…”

Section: Measurement and Expression Of Energy Contentmentioning

confidence: 96%

A short review and critique of methodology used in fish growth and nutrition studies

Jobling

1983

Journal of Fish Biology

166

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A number of the techniques commonly employed in fish growth and nutrition studies are evaluated and limitations imposed by their use are indicated. Total and digestible energy values of dietary formulations should be measured directly and the use of caloric conversion coefficients and assumed digestibility values may lead to serious error. There is considerable misunderstanding relating to the term metabolizable energy and metabolizable energy has been estimated in a number of ways, all of which are unreliable. In view of this, it is suggested that there is a good case to be made for ceasing to use the term.

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“…Mustelids Enhydra lutris, Lontra canadensis, Martes pennati, Mustela nigripes, M. nivalis, M. putorius, M. vison, Taxidea taxus Sinclair et al, 1962;Allen et al, 1964;Roberts and Kirk, 1964;Morris et al, 1974;Moors, 1977;Davison et al, 1978;Austreng et al, 1979;Skrede, 1979;GlemHansen, 1980;Harlow, 1981;Chwalibog et al, 1982;Costa, 1982;Rouvinen, 1990;Szymeczko and Skrede, 1990;Rouvinen and Kiiskinen, 1991excl. high-ash diets;Borsting, 1992;Engberg et al, 1993;Skrede, 1995, 1998;Borsting et al, 1995;Hellinga et al, 1997;Mertin et al, 1999;Po¨lo¨nen, 2000;Tauson et al, 2001;Fekete et al, 2005;White et al, 2007 Pinnipeds …”

Section: Hamor 1983mentioning

confidence: 98%

Carnivorous mammals: nutrient digestibility and energy evaluation

2010

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Estimating the energy content is the first step in diet formulation, as it determines the amount of food eaten and hence the concentration of nutrients required to meet the animal's requirements. Additionally, being able to estimate the energy content of a diet empirically known to maintain body condition in an animal will facilitate an estimation of maintenance energy requirements. We collated data on nutrient composition of diets fed to captive wild canids, felids, hyenids, mustelids, pinnipeds, and ursids and the digestibility coefficients from the literature (45 species, 74 publications) to test whether differences in protein and fat digestibility could be detected between species groups, and whether approaches suggested for the estimation of dietary metabolizable energy (ME) content in domestic carnivores (NRC [2006] Nutrient requirements of dogs and cats. Washington, DC: National Academy Press.) can be applied to wild carnivores as well. Regressions of digestible protein or fat content vs. the crude protein (CP) or fat content indicated no relevant differences in the digestive physiology between the carnivore groups. For diets based on raw meat, fish, or whole prey, applying the calculation of ME using "Atwater factors" (16.7 kJ/g CP; 16.7 kJ/g nitrogen-free extracts; 37.7 kJ/g crude fat) provided estimates that compared well to experimental results. This study suggests that ME estimation in such diets is feasible without additional digestion trials. For comparative nutrition research, the study implicates that highly digestible diets typically fed in zoos offer little potential to elucidate differences between species or carnivore groups, but research on diets with higher proportions of difficult-to-digest components (fiber, connective tissues) is lacking.

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Effect of Dietary Fat Source on the Digestibility of Fat and Fatty Acids in Rainbow Trout and Mink

Cited by 95 publications

References 16 publications

Growth, digestibility and nutrient utilization of rainbow trout (Oncorhynchus mykiss) and European sea bass (Dicentrarchus labrax) juveniles fed different dietary soybean oil levels

Growth, digestibility and nutrient utilization of rainbow trout (Oncorhynchus mykiss) and European sea bass (Dicentrarchus labrax) juveniles fed different dietary soybean oil levels

A short review and critique of methodology used in fish growth and nutrition studies

Carnivorous mammals: nutrient digestibility and energy evaluation

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