Document Type : Research Paper
Authors
Abstract
This experiment was conducted to investigate the effect of thyme extract (TE) and dietary fat on performance and carcass antioxidant properties of Ross 308 broiler chicks (male/female ratio of 50/50). The used experimental design was a completely randomized design with six dietary treatments each replicated 4 times with 10 birds per replicate. Feed intake (FI) and body weight gain (BWG) of the chicks were recorded at the end of starter, grower and finisher periods. These records were used to calculate feed conversion ratio (FCR). The susceptibility to lipid oxidation of thigh muscles from two slaughtered chicks (on day 42) was determined during 45 and 90 days of refrigerated storage (-20 °C) using thiobarbituric acid reactive substances (TBARS) assay. Chicks fed diets supplemented with fat had higher BWG and FI, and lower FCR compared to diets without fat (P<0.05) in all experimental periods. Despite the non-significant effect of TE on growth performance, its use led to significant reduction in TBARS concentrations in thigh meat after 45 and 90 days of storage (P<0.05). Adding TE led to significant increase in glutathione peroxidase concentration in liver (P<0.05), but its increasing effect on liver superoxide dismutase activity was not significant (P>0.05). As an overall conclusion, adding TE and SO to the diets of broiler chicks for the entire experimental period led to improved growth rate in SO supplemented birds and increased oxidative stability of meat in birds supplemented with TE.
Keywords
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