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A total of 120 Hisex Brown laying hens of 22\u2010week\u2010old were randomly allocated into five treatments with six cage replicates for each (four hens\/replicate). Dietary treatments consisted of the basal diet with no Zn\u2010Met supplementation (control group) and basal diet supplemented with 25, 50, 75 or 100\u00a0mg Zn\u2010Met\/kg diet. No significant differences were observed on body weight, body weight gain or feed conversion ratio due to dietary Zn\u2010Met supplementation. However, highly significant impact was observed on daily feed intake. Egg number, egg weight and egg mass were increased in the group fed diet supplemented with the highest level of Zn\u2010Met (100\u00a0mg\/kg of diet) as compared to other groups. All egg quality traits were statistically (<jats:italic>p<\/jats:italic>\u00a0&gt;\u00a0.05 or .01) affected as a response to dietary Zn\u2010Met supplementation except egg shape index, shell percentage and yolk index. In comparison with the control group, dietary supplementation of 25, 50, 75 or 100\u00a0mg Zn\u2010Met\/kg decreased serum triglyceride and <jats:styled-content style=\"fixed-case\">LDL<\/jats:styled-content>\u2010cholesterol levels. Serum cholesterol level was increased with all dietary levels of Zn\u2010Met in comparison with the control group. Dietary Zn\u2010Met supplementation increased the serum content of zinc, where the highest values were recorded with 50 and 100\u00a0mg Zn\u2010Met\/kg diet. Dietary Zn\u2010Met levels did not affect the antioxidant indices in blood serum except for the activity of copper\u2013zinc superoxide dismutase (Cu\u2010Zn\u2010<jats:styled-content style=\"fixed-case\">SOD<\/jats:styled-content>). The activity of Cu\u2010Zn\u2010<jats:styled-content style=\"fixed-case\">SOD<\/jats:styled-content> was increased with Zn\u2010Met supplementations with no differences among supplemental zinc levels. It is concluded that dietary Zn\u2010Met supplementation reduced serum triglyceride, <jats:styled-content style=\"fixed-case\">LDL<\/jats:styled-content>\u2010cholesterol and increased Zn status and resulted in promoting antioxidant ability of laying hens, and the addition of 100\u00a0mg Zn\u2010Met\/kg to layer diet was appropriate for improving the above parameters in addition to egg production indices and Haugh unit score.<\/jats:p>","DOI":"10.1111\/jpn.12793","type":"journal-article","created":{"date-parts":[[2017,10,9]],"date-time":"2017-10-09T09:58:39Z","timestamp":1507543119000},"source":"Crossref","is-referenced-by-count":25,"title":["Effect of dietary supplementation of organic zinc on laying performance, egg quality and some biochemical parameters of laying hens"],"prefix":"10.1111","volume":"102","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-2831-8534","authenticated-orcid":false,"given":"M. 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A.","family":"Amer","sequence":"additional","affiliation":[{"name":"Department of Nutrition and Clinical Nutrition Faculty of Veterinary Medicine Zagazig University  Zagazig Egypt"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M.","family":"Arif","sequence":"additional","affiliation":[{"name":"Department of Animal Sciences University College of Agriculture, University of Sargodha  Sargodha Pakistan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"K. M. M.","family":"Wahdan","sequence":"additional","affiliation":[{"name":"Department of Agricultural Biochemistry Faculty of Agriculture Zagazig University  Zagazig Egypt"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M. 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