Effects of organically-complexed minerals on meat quality in chickens.
ABSTRACT The impact of combined lower concentrations of organically-complexed versus inorganic copper, zinc and manganese on meat quality in chickens was investigated. A total of 200 male broiler chicks (Ross-308), 1-d-old and weighing approximately 40 g, were divided into 4 groups comprising three experimental groups and one control group, with each consisting of 50 chicks. All groups were also divided into 5 subgroups, with each containing 10 broiler chicks. All birds were given a starter diet from d 1 to d 21, and a grower diet from d 22 to d 49. The diets were formulated according to the NRC recommendations. The mineral contents of the control diet were supplied using a standard inorganic mineral premix (containing 8 mg Cu as CuSO₄, 40 mg Zn as ZnSO₄, and 60 mg Mn as MnO, per kg). For the experimental diets, a mineral premix was prepared using organically complexed forms of those minerals at 1/3 (L1), 2/3 (L2) and 3/3 (L3) proportions. After slaughtering and evisceration, the carcases were stored at 3 ± 0·5°C for 10-12 h, and then the breast fillets removed from the carcases, and stored in a deep-freezer (-86°C) until analysis (for 30 d). For analyses, the breast muscles were then thawed at 4-6°C for 24 h. 6. The concentration of organically complexed mineral in the diet had no statistically significant effect on pH values of breast fillets. Treatments significantly affected the Thiobarbituric Acid Reactive Substances (TBARS) values. Lightness (L* value) of the fillet from broilers fed the diet containing inorganic minerals was significantly lower than that for broilers fed on the diets containing organically complexed minerals. The redness (a* value) and Chroma (C* value) significantly decreased while Hues (H* value) were higher in the fillet from broilers fed organically complexed minerals compared with those fed inorganic minerals. The yellowness (b* value) was not changed by dietary treatment.
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ABSTRACT: SUMMARY In an experiment with 2,040 Ross 308 broiler chickens, the effect of substituting inorganic with organic minerals in broiler feed on performance was determined. The experiment comprised 2 dietary treatments, with 6 replicates of 170 mixed-sex broiler chickens per pen replicate. Experimental diets consisted of a control treatment, formulated with inorganic Mn, Zn, Fe, and Cu sulfates at levels of 70, 37, 45, and 12 ppm, respectively, and an organic mineral diet supplemented with lower levels of Mn, Zn, Fe (all 10 ppm), and Cu (2.5 ppm) supplied as peptide chelates (Bioplex). Production performance was measured during the 39-d trial period, and mineral excretion was evaluated at 26 d of age. In the starter period (0 to 14 d), FCR tended to improve (P = 0.06) in broilers fed the organic mineral diet. However, no significant differences were observed in any of the productive performance parameters measured during the trial. Significantly lower (P < 0.05) excretion rates were recorded for all minerals in fecal samples taken from broilers receiving the organic mineral diet. Fecal levels of Mn, Zn, Fe, and Cu were 46, 63, 73, and 55%, respectively, compared to the controls.Journal of Applied Poultry Research - J APPL POULTRY RES. 01/2007; 16(4):592-597.
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ABSTRACT: Supplementation of trace minerals with a large safety margin in broiler chickens has resulted in a high level of mineral excretion that ends up in the environment. Organically complexed trace minerals (organic minerals) may be able to replace the inorganic trace minerals, because the former appear to have a greater bioavailability. Therefore, a 29-d cage study that included diets with supplemental trace minerals from organic and inorganic sources based on a trace mineral deficient control diet was conducted to examine the possible response of broiler chickens to organic mineral supplements. The results showed that supplementation with 4 mg of Cu and 40 mg each of Fe, Mn, and Zn from organic sources may be sufficient for normal broiler growth to 29 d of age. It is possible to use these lower levels of organic trace minerals in broiler diets to avoid high levels of trace mineral excretion.Journal of Applied Poultry Research. 16(3):448-455.
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ABSTRACT: The importance of poultry skin and meat color (both absolute and variations in color) in the market place have been well established. It has also been reported that these colors change over time. With the development of computer-assisted vision grading systems, the changes in skin and meat color during and after processing have become important, based on calibrations and assessment values based on color. Four independent experiments were conducted to determine the pattern of color change in broiler skin and meat during processing and storage. Skin color change was measured on subscald (57 C) and semiscald (50 C) breast skin surfaces and on breast and leg meat, on the carcass and following deboning and packaging. A reflectance colorimeter was used to determine lightness (L*), redness (a*), and yellowness (b*) at 20-min intervals for the first 3 h, at 30-min intervals between 3 and 8 h, hourly between 8 and 12 h, and daily up to 8 d postmortem. Results clearly show that color values for both skin and meat changed dramatically for the first 6 h postmortem, after which the changes were less pronounced. The skin from semiscalded birds showed less change than the skin from subscalded birds. These results indicate that on-line vision systems need to take into account the dramatic changes in skin and meat color during the first 6 h postmortem, after which the color changes may be less important.Poultry Science 11/2002; 81(10):1589-97. · 1.52 Impact Factor