Effects of the repartitioning agent ractopamine on the growth and body composition of rainbow trout, Oncorhynchus mykiss (Walbaum), fed three levels of dietary protein

Moccia, Richard D.; Gurure, R.M.; Atkinson, Joanne; Vandenberg, Grant W.

doi:10.1046/j.1365-2109.1998.00264.x

Cited by 16 publications

(14 citation statements)

References 9 publications

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“…Regarding fish, phenethanolamines had a more pronounced effect on performance, protein increase and fat reduction of Siluriforms (Mustin and Lovell, 1993;Mustin and Lovell, 1995;Webster et al, 1995). Moccia et al (1998) speculated that differences in responses to RAC observed between Siluriforms and Salmonids could be partly caused by differences in rearing water temperatures. However, the Cyprinid rohu reared in warm water (26-30ºC) showed growth performance, protein increment and fat reduction similar to rainbow trout.…”

Section: Resultsmentioning

confidence: 99%

Growth, body composition and hematology of juvenile pacu (Piaractus mesopotamicus) fed increasing levels of ractopamine

Bicudo

Sado

Cyrino

2012

Arq. Bras. Med. Vet. Zootec.

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Growth, body composition and hematology of juvenile pacu (Piaractus mesopotamicus)fed increasing levels of ractopamine [Crescimento, composição corporal ABSTRACTThe effects of four levels of dietary ractopamine (RAC) on growth, body composition and hematology of pacu, Piaractus mesopotamicus juveniles (103.6±3.3g) were studied. Fish were housed into 12 circular tanks of 1 m 3  15 fish per tank  and fed for 60 days with practical diets supplemented with 0; 10; 20 or 40mg RAC per kg of diet, in a totally randomized design trial (n=3). Fish fed diets containing up to 40mg RAC/kg diet for 60 days did not have improved growth or body composition parameters. There were no significant differences in hematocrit, hemoglobin and mean corpuscular hemoglobin. Plasma glucose and triglycerides were significantly smaller in fish fed with RAC; however no significant differences between RAC levels were detected. The inclusion of up to 40mg RAC/kg of diet did not improve growth and body composition, but influenced some hematological and biochemical parameters of juvenile pacu. Keywords

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Section: Resultsmentioning

confidence: 99%

Growth, body composition and hematology of juvenile pacu (Piaractus mesopotamicus) fed increasing levels of ractopamine

Bicudo

Sado

Cyrino

2012

Arq. Bras. Med. Vet. Zootec.

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“…While pigs have large weight gain in the finishing phase, most of the fish in the same phase have a minimal growth rate (Johnston, 1999). Other researchers have also reported that the use of dietary ractopamine does not improve the performance of P. mesopotamicus juveniles (Bicudo et al, 2012) or other fish species such as Cyprinus carpio juveniles (Devens et al, 2012) and Oncorhynchus mykiss (Moccia et al, 1998).…”

Section: Discussionmentioning

confidence: 99%

Metabolic and histologic responses of pacu (Piaractus mesopotamicus) fed diets supplemented with increasing concentrations of ractopamine

et al. 2018

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An experiment was conducted during 60 days with forty pacu males fed diets supplemented with increasing concentrations of ractopamine (0.00, 11.25, 22.50, 33.75, and 45.00 mg kg −1). Eight fish were evaluated for each experimental diet. Performance and survival rate of the fish were measured. At the end of the experiment, blood was collected to determine the levels of cortisol, triacylglycerol, and protein. Moreover, the liver was collected to determine the activities of glucose-6phosphate dehydrogenase and malic enzymes. The fillets were collected to determine chemical composition, and histologic cuts were analyzed to verify muscle growth and deposition of adipose tissue between muscle fibers. Increasing concentrations of dietary ractopamine did not change feed intake, fillet yield, fillet content of protein and ash, and frequency of relative distribution of muscle fibers. By increasing the dietary ractopamine concentration, the serum cortisol level was elevated. Ractopamine supplementation (45.00 mg kg −1) increased serum levels of triacylglycerol and protein and reduced the activity of hepatic lipogenic enzymes and the survival rate of the fish, probably in response to the high concentration of circulating cortisol. In addition, the higher level of ractopamine supplementation evaluated in this research impaired the weight gain and feed conversion. However, 11.25 mg kg −1 ractopamine reduced the ether extract level determined in the fillet and the fat deposition between muscle fibers, improving the nutritional quality of meat.

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“…Commercial extruded trout feed was used as the feed material according to the size of the fingerlings (No: 0-1-2-3). The doses of the growth agent added to the feeds were calculated as (0.0, 27.4, 54.8 and 82.2 µg/g) by taking the results of other studies conducted with similar purposes (McLean et al, 1997;Moccia et al, 1998; into consideration.…”

Section: Methodsmentioning

confidence: 99%

“…At the end of the experiment, 4 fingerlings randomly chosen from each of the 16 units were weighed on a ±1 mg precision digital scale, their weights were determined, their total length was measured with 0.1 cm error, and their values of head, fin, carcass weight, hepatosomatic index and viscerosomatic index were measured respectively in order to determine meat composition as described by Moccia et al (1998).…”

Section: Methodsmentioning

confidence: 99%

Effects of different water temperatures and growth agent (recombinant human somatotropin) (r-hGH) on features such as growth, condition factor, feed conversion ratio, survival rate and meat composition of rainbow trout (Oncorhynchus mykiss) fingerlings

Karabulut¹,

Aras²

2011

Afr. J. Biotechnol.

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In this study, the effects of temperature and different levels of recombinant human somatotropin, one of the growth agents, on growth performances and body composition of the rainbow trout (Oncorhynchus mykiss) were investigated. Two different temperatures (10.1 ± 0.10°C and 14.8 ± 0.50°C) and four different doses of the growth agent were added to the feed (0.0, 27.4, 54.8 and 82.2 µg/g) in this experiment. The following results were obtained from the research conducted according to 2 x 4 x 2 randomized factorial experimental design which lasted for a total of 230 days (114 feeding days with growth agent). At the end of the experiment, weights of the fingerlings whose initial weights were 0.23 ± 0.04 g, differed between applications. While the highest value was obtained as 17.51 ± 0.56 g from the 27.4 µg/g growth agent at higher temperature group, the lowest values were obtained as 7.05 ± 0.06 g from the control group at normal temperature and 8.35 ± 0.19 g from the 82.2 µg/g growth agent normal water temperature group. The differences between water temperatures and levels of growth agents were found to be statistically significant (p < 0.01). In terms of feed conversion ratio (FCR), different values were obtained from the groups and the differences between them were also found to be statistically significant (p < 0.01). While the best feed conversion ratio was obtained as 1.43 ± 0.24 and 1.43 ± 0.23 g from the 27.4 and 54.8 µg/g growth agents at normal temperature groups, the lowest value was obtained as 1.85 ± 0.11 in the control group at higher temperature. From the survival rate (SR) point of view, the difference between the results obtained from the groups was found to be statistically significant in terms of water temperatures, but not significant in terms of the levels of growth agent (p < 0.05). As a result of proximate analyses of fish meat, the differences between water temperatures and levels of growth agents were found to be statistically significant in terms of crude protein and crude lipid values (p < 0.01). The crude protein ratio was found to be higher and the crude lipid ratio was found to be lower in the groups given the growth agent. After investigating the results obtained from other analyses at the end of the study, the carcass weight was found to be statistically significant (p < 0.01), the condition factor (CF) was not found to be significant, and values of hepatosomatic index (HSI) and viscerosomatic index (VSI) were found to be statistically significant (p < 0.01) in terms of water temperatures and levels of the growth agent. According to GC-MS (gas chromatography-mass spectrophotometer) tests, residue of the growth agent was found to be negative in the body of fries 15 days after addition to the feed was ceased.

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Effects of the repartitioning agent ractopamine on the growth and body composition of rainbow trout, Oncorhynchus mykiss (Walbaum), fed three levels of dietary protein

Cited by 16 publications

References 9 publications

Growth, body composition and hematology of juvenile pacu (Piaractus mesopotamicus) fed increasing levels of ractopamine

Growth, body composition and hematology of juvenile pacu (Piaractus mesopotamicus) fed increasing levels of ractopamine

Metabolic and histologic responses of pacu (Piaractus mesopotamicus) fed diets supplemented with increasing concentrations of ractopamine

Effects of different water temperatures and growth agent (recombinant human somatotropin) (r-hGH) on features such as growth, condition factor, feed conversion ratio, survival rate and meat composition of rainbow trout (Oncorhynchus mykiss) fingerlings

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