Abstract
ABSTRACTThe present study was carried out to examine the effects of a trace mineral premix (MP) reduction or withdrawal from finisher diet (29–42 d) on performance, meat lipid oxidation, and immune system of chicks fed wheat- or barley-based diet. The diets were formulated based on wheat and barley for seven treatments and five replicates of each treatment. At 29 and 36 d, 4 birds from each replicate were injected with sheep red blood cells. The cell-mediated immunity was determined via phytohemagglutinin and dinitrochlorobenzene at 34 and 42 d of age. At 35 and 42 d of age, the oxidative stability was evaluated by thiobarbituric acid reactive substances on the thigh samples that were stored for 180 days at −20˚C. The reduction or withdrawal of MP from diets did not affect the performance or the immune system. Results of TBARS showed that lipid peroxidation of the treatment without MP was significantly higher than of the other treatments when slaughtered at 42 days of age. Finally, the results of this study demonstrated that it is not possible to remove the MP in finisher broilers’ diets without negative effects on meat quality during the time of freezing.
Highlights
Minerals have important biological functions, and the requirements of broiler chickens have to be met for optimum growth and performance
The present study was carried out to examine the effects of a trace mineral premix (MP) reduction or withdrawal from finisher diet (29–42 d) on performance, meat lipid oxidation, and immune system of chicks fed wheat- or barley-based diet
Performance: mortality for all groups was within the expected range and there was no significant difference in mortality of all treatments
Summary
Minerals have important biological functions, and the requirements of broiler chickens have to be met for optimum growth and performance. Food manufacturers use much higher concentrations than those specified by NRC (1994) (Jafari Sayadi et al 2005). For this reason, mineral deficiencies are not commonly observed. Several reasons should be taken into account: (1) the instability of world corn prices increases the propensity of producers to use wheat and barley instead of corn in the diet; (2) differences between mineral content in wheat, barley and corn and (3) lack of reports about effect of withdrawal or reduction of MP on the meat lipid oxidation. This study was carried out to evaluate the effects of reduction or withdrawal of the MP from broiler diets during finisher period on performance, immune system and meat lipid oxidation
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