Publication Date:
2021-05-19
Description:
An experiment was conducted to study the effects of oil source, L- carnitine and ractopamine
supplements on growth performance and blood biochemical parameters of rainbow trout. With 2×2×2
factorial experimental design, 288 fish with 90 ±5 g initial weight were randomly distributed to 32
fiber glass thanks and fed two times a day at ad libitum by eight dietary treatments during 8 weeks.
The experimental diets were containing two supplemental dietaries L- carnitine levels (0 and 1 g.kg-1
),
two levels of ractopamine (0 and 10 mg.kg-1
) and two dietary oil sources (fish and soybean oil). Feed
conversion ratio (FCR), specific growth rate (SGR), feed intake, body weight gain and biochemical
parameter of blood serum in fish such as albumin, total protein, triglyceride, cholesterol and high
density lipoprotein (HDL) were measured at the end of experiment. Results showed that feed
conversion ratio of fish was not affected by dietary oil sources and ractopamanie supplements but
addition of L- carnitine to diet reduced it significantly. Addition of L-carnitine and ractopamine to diet
which contain fish oil improved significantly FCR of fish. Fish oil increased fish SGR and its highest
level was seen at fish oil plus ractopamine dietary treatment. Feed intake was affected by fish oil and
L- carnitine supplement which is increased and reduced it, respectively. Addition of L- carnitine to
diet containing fish oil with ractopamine, significantly reduced feed intake of fish. Body weight gain
of fish were not affected by dietary oil sources, L-carnitine and ractopmanine supplement; however,
addition of ractopamine to diet containing fish oil improved it. Ractopamine supplement significantly
reduced level of triglyceride and L-carnitine increased albumin and HDL of blood serum of fish.
Interaction between oil sources and addition of L- carnitine and ractopamine supplements were seen
on biochemical blood serum of fish except HDL. The highest level of albumin and triglyceride in
blood serum were seen in fish fed by soybean oil plus L- carnitine, and also the highest level of total
protein and globulin in serum were in fish fed by soybean oil plus ractopamine. Overall, results of this
experiment showed that physiological and growth responses of rainbow trout to dietary L- carnitine
and ractopamine supplements were affected by dietary oil sources.
Description:
Published
Keywords:
Rainbow trout
;
Oncorhynchus mykiss
;
L-carnitine
;
Ractopamine
;
Soybean oil
;
Oil source
;
Dietary
;
Blood
;
Growth
;
Performance
;
Biochemical
;
Parameters
;
Fish oil
Repository Name:
AquaDocs
Type:
Journal Contribution
,
Refereed
Format:
pp.109-120
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