Impacts of Dietary Supplementations of Orange Peel and Tomato Pomace Extracts as Natural Sources for Ascorbic Acid on Growth Performance, Carcass Characteristics, Plasma Biochemicals and Antioxidant Status of Growing Rabbits

Abstract

The effect of dietary orange peel (OPE) and tomato pomace extract (TPE) supplementations on growth performance, plasma biochemicals, carcass characteristics and antioxidant status of growing male rabbits were investigated. A total of 96 rabbits (5 weeks old) were distributed into four groups. The first group received untreated pelleted diet (control). The second group was fed a diet containing ascorbic acid (AA; 1.0 g/kg diet), while the third and fourth groups consumed diets supplemented with 200 gm of OPE or (TPE, respectively. Our results indicated that OPE and TPE contained 59, 14.03 mg ascorbic acid/100 g DM, respectively. Growth performance, except feed conversion ratio, and carcass weight were improved by dietary supplementations. Dietary supplementations decreased kidneys, abdominal, back fats and ether extract of meat. Plasma protein and globulin levels were high in rabbits fed AA and TPE-supplemented diets. Low plasma total cholesterol and LDL-cholesterol concentrations were observed in rabbits fed the supplemented diets. Plasma AA was increased in rabbits fed AA and OPE-supplemented diets. Rabbits fed OPE and TPE-supplemented diets had great SOD activity. The best economic efficiency was recorded by rabbits fed the supplemented diets. Dietary supplementations of OPE and TPE could effectively improve growth performance, antioxidative status, modulate AA level in plasma and meat and lower plasma total cholesterol and LDL.

Tomato pomace as a nontraditional feedstuff: productive and reproductive performance, digestive enzymes, blood metabolites, and the deposition of carotenoids into egg yolk in quail breeders

“…Another point of view related to carotenoids incorporation into the egg yolk increased lycopene and other carotenoids into the egg yolk was associated with decreased egg yolk MDA concentrations ( Akdemir et al, 2012 ). The reduction in MDA in egg yolk due to tomato supplementation is considered as an effective strategy to enhance oxidative stability of fresh eggs ( Saed et al, 2018 ; An et al, 2019 ; Panaite et al, 2019 ) and meat quality in rabbits ( Hassan et al, 2021 ), so we could conclude that in the current study the improvement in the percentage of fertility and hatchability may be due to increase the oxidative stability of the egg yolk.…”

“…Also, tomato pomace inclusion into laying hens diets reduced triglycerides under heat stress conditions ( Saed et al, 2018 ). Dietary supplementation of TP extract reduced cholesterol, LDL, while increased HDL in growing rabbits ( Hassan et al, 2021 ). Tomato juice had hypocholesterolemic effects via suppressing 3-hydroxy-3-methylglutaryl coenzyme A reductase ( HMGCR ) activity that serving as the rate-limiting enzyme of cholesterol synthesis ( Periago et al, 2016 ) then adjust the low-density lipoprotein receptor ( LDL-R ) and suppress the activity of acyl-coenzyme A: cholesterol acyltransferase ( ACAT ) ( Palozza et al, 2012 ).…”

“…Dietary tomato paste improved antioxidant capacity by increasing lycopene serum concentrations and decreased MDA in laying hens ( Orhan et al, 2021 ). Moreover, lycopene as a powerful antioxidant compound reduced MDA concentration and reactive oxygen species ( ROS ) levels, while improving the total antioxidant capacity ( T-AOC ) and antioxidant enzyme activities in mice ( Xu, et al, 2019 ) and rabbits ( Hassan et al, 2021 ). Tomato paste or lycopene supplementation to laying hens reduced serum and egg yolk MDA ( An et al, 2019 ).…”

Sweet Orange (Citrus sinensis) Peel Powder with Xylanase Supplementation Improved Growth Performance, Antioxidant Status, and Immunity of Broiler Chickens

“…Citric acid, flavonoids, and phytochemicals are abundant in the orange peel, making it a powerful antioxidant (Arora and Kaur 2013;M'hiri et al 2015). For example, the flavonoids and vitamin C contents of dried OPP are 110-128mg/g, (Hassan et al 2021). The dietary inclusion of orange peel ethanolic extract enhanced the antioxidant capacity of growing rabbit (Hassan et al 2021) and reduced the oxidative stress product MDA and lipid peroxidation in broiler chicken meat (Vlaicu et al 2020).…”

Protective effects of vitamin C against oxidative stress induced by diethylene glycol in liver and kidney

“…Furthermore, as a natural scavenger of free radicals, its effectiveness in neutralizing reactive oxygen species is enhanced by the oxidation of vitamin C to monodehydroascorbate, reacting to free radicals. Furthermore, ascorbic acid protects against harmful effects [6]. The goal of this study is to see the vitamin c protective influences against oxidative stress, liver and kidney destructions which diethylene glycol in rabbit induces.…”