Effects of Dietary Inclusion of Oil Sources With or Without Vitamin E on Body Composition and Meat Oxidation Level in Broilers*

Eö Taşdelen,N Ceylan

doi:10.1590/1806-9061-2016-0174

Abstract

ABSTRACT The objective of this study was to investigate the effects of rapeseed oil substitution and vitamin E supplemantation on performance and meat quality. 4 replacement levels of rapeseed oil with sunflower oil ( 0, 33.3 , 66.7 and 100%) and 2 levels of vitamin E (0 (50 I.U. from vitamin premix) 300 mg/kg) in a 2 x 3 factorial arrangement for a total of 8 treatments with 4 replicates each, containing 10 day-old male Ross 308 broilers, were examined in the experiment. Dietary treatments had no significant effect on carcass parameters, feed conversion (FCR) and mortality (p>0.05). However, a significant interaction was observed between oil replacement and vitamin E: the negative effect of 100% sunflower oil on BWG (p<0.01) was alleviated by the addition of vitamin E. On the other hand, inclusion of rapeseed oil improved BWG (p<0.01). Rapeseed oil substitution significantly increased amount of total n-3 PUFA and decreased n-6:n-3 ratio in thigh and breast meat (p<0.01). Vitamin E supplemantation contributed to deposition of n-3 PUFA (p<0.01). Replacement of rapeseed oil without vitamin E tended to increase (p<0.01) malonaldehyde production. However, the dietary supplementation of vitamin E markedly (p<0.01) decreased the susceptibility of meat to peroxidation. Inclusion of rapeseed oil did not cause any negative perception on olfactory, texture, and taste of broiler meat. So, it can be concluded that rapeseed oil substitution significantly increased n-3 PUFA deposition without altering performance and sensory properties of broiler meat and, vitamin E had strong potential to prevent the meat lipids from oxidation.

Highlights

Ancestral human nutrition studies revealed that, compared to today’s diets, the amount of fat in a balanced diet did not exceed 20-30% of total energy intake, in which 5-6 g/d of omega-3 poly unsaturated fatty acids (n-3 PUFA) with rich eicosapentanoic acid (EPA, C20:5n-3) + docosahexaenoic acid (DHA, 22:6n-3) and the ratio of n-6:n-3 averaged 1:1 or 1:2 with low saturated and trans fatty accids (FAs)
The sunflower oil diet contained a greater proportion of linoleic acid (LA) (18:2n-6) which was the major FA (60.40%) compared to rapeseed oil diet (20.82%) the only one of the n-6 series
Dietary oil level had significant effect on body weight gain (BWG) during the starter period of trail so that, birds fed on diet containing 33.3 % replacing level had the highest BWG (p=0.01); the effect of vitamin E and its interaction with dietary oil was not significant for starter period

Summary

Introduction

Ancestral human nutrition studies revealed that, compared to today’s diets, the amount of fat in a balanced diet did not exceed 20-30% of total energy intake, in which 5-6 g/d of omega-3 poly unsaturated fatty acids (n-3 PUFA) with rich eicosapentanoic acid (EPA, C20:5n-3) + docosahexaenoic acid (DHA, 22:6n-3) and the ratio of n-6:n-3 averaged 1:1 or 1:2 with low saturated and trans fatty accids (FAs). Nowadays, this ratio has changed to 15:1 to 20:1, which points out the significantly reduced amount of n-3 PUFA in the diets (Simopoulos, 2000; Simopoulos, 2008; Molendi-Coste et al, 2011) but the approved ratio for human health is between 4:1 to 10:1 (Mazalli et al, 2004). N-3 PUFAs such as EPA, Taşdelen EÖ, Ceylan N

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Results