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Abstract
In this study, orange pulp (OP) and/or organic Se were fed to broilers in order to investigate their effects on the performance, behavior, breast meat quality, and oxidative stability. A total of 240 chicks were allocated to four groups: a control group; an OP group, fed with OP at 50 g/kg of diet; a Se group, fed with organic Se at 0.15 ppm; and an OP + Se group, fed with OP and organic Se at 50 g/kg and 0.15 ppm, respectively. The selenium and OP + Se groups showed improved meat oxidative stability during frozen storage from 90 to 210 days (p < 0.05), whereas the performance and meat quality were unaffected by the dietary treatments (p > 0.05), apart from a reduction in the meat pH and the dressing percentage in the OP-supplemented groups (p < 0.05). A synergistic action between OP and Se was observed for the meat oxidative stability. The polyunsaturated fatty acid (FA) and α-linolenic acid (ALA) contents in the breast meat lipid fractions were increased in the OP groups (p < 0.05). Dietary intervention did not affect the feeding or drinking behaviors of the broilers (p > 0.05). The dietary supplementation of broiler chickens with the citrus industry byproduct orange pulp at 50 g/kg, along with organic Se at 0.15 ppm, beneficially improves the meat oxidative stability and the meat nutritional value, with no negative side effects on the performance or the meat quality.
Highlights
In recent years, a continuous increase in livestock production costs has been observed, due to the increased prices of feedstuffs, such as soybean products and cereal grains
No significant differences were determined among the experimental diets, apart from an increase in n-3 fatty acids, and a slight increase in the monounsaturated fatty acid (MUFA) content, whereas the saturated fatty acids (SFA) were slightly decreased in the orange pulp (OP)-supplemented diets
The broiler performance in the present study was not influenced by the dietary supplementation with organic Se, which is in agreement with a number of studies related to organic selenium supplementation in broiler chickens, at dosages ranging from 0.1 to 0.5 ppm [35,36,37,38,39]
Summary
A continuous increase in livestock production costs has been observed, due to the increased prices of feedstuffs, such as soybean products and cereal grains. Low-input feeding strategies are a prerequisite for minimizing the animal nutrition expenses that are based on alternative feeding resources, such as shrubs, bushes, novel pastures, and agroindustrial byproducts [1]. Animal products are, nowadays, intended to satisfy nutritional needs, and to protect human organisms against degenerative diseases that are linked to oxidative stress. The consumption of foods rich in functional compounds (nutraceuticals) can, reinforce the activity of the endogenous systems against these diseases and lead to an improvement in mental and physical wellbeing [2,3]. Agroindustrial byproducts are considered to be a cheap source of these compounds, and their application in animal nutrition minimizes the environmental impact induced by their disposal (due to their high organic load) and enables the sustainability of high-added value ingredients inside the food chain [4].
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