The effects of copper-glycine complexes on chemical composition and sensory attributes of raw, cooked and grilled chicken meat

Abstract

To determine the influence of glycine-Cu chelates (Gly-Cu) on chemical composition and sensory characteristic of chickens meat, two hundred of Ross 308 broilers were fed diets containing 16 mg kg(-1) of copper sulfate (S-Cu; control group) or 16, 8 and 4 mg/kg of Cu-glycine chelate (Gly-Cu). The chemical composition was determined in crude and prepared (cooked and grilled) breast and thigh samples. No significant influence of Gly-Cu on the content of the protein, fat and ash in the breast meat was found. Substituting S-Cu with Gly-Cu at different doses in feed did not significantly modify the fatty acids profile of the meat. The breast meat from chickens administered with Gly-Cu contained significantly less cholesterol than that in S-Cu. No different effect of the experimental agent was observed regarding the content of Cu, Zn and Ca in the breast meat, while in chickens from all the groups administered Gly-Cu there was more significantly Fe (P < 0.01) in comparison with the S-Cu group. The thigh meat revealed significantly (P < 0.01) higher levels of Zn and Ca in comparison with the 16 mg S-Cu group. No significant effect of the diet on the sensory characteristics of the meat was observed.

The chemical composition and sensory properties of raw, cooked and grilled thigh meat of broiler chickens fed with Fe-Gly chelate

“…Characteristic of the capillary column: type CP WAX 52CB, DF 0.25 mm 9 60 mm, flow rate of gas (helium) carrier-1.4 ml/min, column temperature 120°C gradually increasing by 2°C/min up to 210°C, determination time 120 min, detector FID temperature 260°C, other gases-hydrogen and oxygen. The content of total cholesterol was determined by the colorimetric method using an EPOLL 20 colorimeter and C3045 standard (Sigma, USA) (Kwiecień et al 2014;Winiarska-Mieczan and Kwiecień 2015). The pH of raw meat was determined 15 and 45 min after slaughter using a method developed by Santé and Fernandez (2000) in a Testo 205 pH-metre (Testo AG, Germany), as described elsewhere (WiniarskaMieczan and Kwiecień 2015).…”

“…It was demonstrated that chelated minerals were characterised by better assimilability, and so could be used at levels even 75% lower than recommended with no significant reduction in the production performance and slaughter yield Winiarska-Mieczan and Kwiecień 2015), which reduces the excretion of minerals into the environment. The interest in chelates is connected with an increasing awareness among consumers who want to eat food that is not only highly valuable but is also produced without excessive environmental load.…”

Effects of dietary alfalfa protein concentrate on lipid metabolism and antioxidative status of serum and composition and fatty acid profile and antioxidative status and dietetic value of muscles in broilers

“…Because these were not directional modifications, it is not possible based on the present results to determine unequivocally the effect of the APC application on the fatty acid profile in the muscles of the studied broiler chickens. Similarly, no significant impact of the experimental factor on the proportion of acids in both muscles was found in a study conducted by Winiarska and Kwiecień (2015) . In other investigations ( Kiczorowska et al., 2015 ), only a tendency toward a reduction in the amount of SFA sum in favor of the MUFA sum was observed in breast and thigh muscles.…”

“…The total cholesterol content in the muscles was determined with the colorimetric method using an EPOLL 20 colorimeter and C3045 standard (Sigma) ( Winiarska-Mieczan and Kwiecień, 2015 ). The content of fatty acids in the feed and muscles was determined after extraction of fat with a mixture of chloroform and methanol using the method described by Folch et al.…”

The effect of feed supplementation with a copper-glycine chelate and copper sulphate on cellular and humoral immune parameters in chickens

“…determined according to procedure 978.10 (AOAC, 2006) using the Ankom 220 Fibre Analyzer (Ankom Technology, Macedon, NY, USA). Cu content in the diets, the following incineration in a muffle furnace at 550°C, with hydrogen peroxide as an oxidizer, was determined by FAAS in a Unicam 939 AA Spectrometer, using Merck standards (Germany), as described by Winiarska-Mieczan and Kwiecień (2015). Total P content was determined by colorimetry according to PN-76/R-64781 in a Helios α-Unicam spectrometer.…”