Influence of dietary vitamin E and zinc on performance, oxidative stability and some blood measures of broiler chickens reared under heat stress (35 °C)

Abstract

Influence of dietary vitamin E and zinc on performance, oxidative stability and some blood measures of broiler chickens reared under heat stress (35 °C)This study was conducted to determine the effects of vitamin E (αTA; dL-α-Tocopheryl acetate) and zinc (Zn; ZnCl2) on performance, oxidative stability and some blood measures of broiler chickens under normal and hot temperatures. One hundred sixty 10-day-old male chicks were assigned to four groups in four replicates. The birds received two diets, control and enriched with two levels of vitamin E and Zn (100 and 50 mg/kg of diet, respectively) under two ambient temperatures (22 °C and 35 °C). Although the diets enriched with the antioxidant vitamin and element compared with un-enriched diets resulted in the better performance of the birds, significant differences were related to temperature conditions, as the lowest feed conversion ratio (FCR) and the highest body weight (BW) were observed in the group fed the enriched diet under normal temperature. The serum malondialdehyde (MDA), cholesterol (C), triglycerides (TG), glucose (G), total protein (TP), and hematocrit and heterophil: lymphocyte ratio levels were significantly lower in birds reared under 22 °C compared with the group under 35 °C but the hematocrit was not significantly lower in groups fed enriched diets and exposed to normal conditions (P>0.05). It was concluded that a combination of 100 mg of vitamin E and 50 mg of Zn provides the better performance and the least blood C and TG levels accompanying the better oxidative stability in male broilers under normal temperature (22 °C) and that this combination can be considered as a protective strategy in broiler diets for reducing the negative effects of heat stress.

Synergistic Ameliorative Effects of Organic Chromium and Selenium Against Heat Stress in Japanese Quails: Performance, Immunological, Hematological, Biochemical And Antioxidant Studies

“…(2008), Hosseini Mansoub et al (2010 and Tawfeek etal. (2014) they reported that heat stress enhances lipid metabolism associated with the increase in serum total cholesterol (TC) and triglyceride (TG).…”

“…Heat stress causes an increase in free radicals by starting lipid peroxidation in cell membranes and the release of stress hormones that directly influence glucose and lipid metabolisms as well as protein catabolism (Hosseini-Mansoub et al, 2010;Imik et al, 2013).Therefore, poultry production suffers significant economic losses every year because of heat stress such as high morbidity and mortality, reduced growth rate and immune suppression (Utomo et al, 1994) and (Star et al, 2007).…”

<b>Heat stress and vitamin E in diets for broilers as a mitigating measure

“…According to Hosseini-Mansoub et al (2010), the combination of 100 mg kg -1 of vitamin E + 50 mg kg -1 zinc is a strategy for broilers reared under heat stress, as it favors the growth performance. Nevertheless, Lopes et al (2015) claimed that levels of zinc and vitamin E above the commonly used do not improve the feed intake, weight gain, feed conversion, production viability and the production efficiency index of broilers kept under high temperatures reared on reused litter.…”

Effects of Dietary Supplementation of Some Antioxidants on Liver Antioxidant Status and Plasma Biochemistry Parameters of Heat-Stressed Quail

“…Reduction of glucocorticoids secretion may limit the lipid catabolism and the lipolysis (Hajati et al 2016). Likewise, Hosseini-Mansoub et al (2010) found that the antioxidant (vitamin E+zinc) supplementation to diets of broiler chickens reared under thermoneutral and high temperature significantly decreased serum cholesterol and triglyceride levels compared to diet without antioxidant supplementation. Morever, Sujatha et al (2010) indicated that polyherbal premix supplementation to broiler diets exposed to HS significantly reduced plasma cholesterol.…”

“…HS causes an increase in free radicals by starting lipid peroxidation in cell membranes and the release of stress hormones that directly influence glucose and lipid metabolisms as well as protein catabolism (Hosseini-Mansoub et al, 2010;Imik et al, 2013). Increasing concentrations of corticosterone were parallel to increases in serum glucose, triglyceride and cholesterol concentrations (Sahin et al, 2003).…”