Document Type : Research Paper

Authors

1 Department of Poultry Science, Faculty of Agriculture, Tarbiat Modares University

2 Professor, Department of Poultry Science, Faculty of Agriculture, Tarbiat Modares University

3 Professor Department of Microbiology and Immunology, Faculty of Veterinary Medicine, University of Tehran

4 Associate Professor, Medicinal Plant Research Center, Jihad Daneshgahi,

Abstract

In order to investigate the effect of Savory and Ajwain essential oils on performance and the quality of produced eggs in the challenged hens with Salmonella Enteritidis, 100 Hy-Line W-36 laying hens with 44 week-olds, in a randomized complete block design were studied for 13 weeks. Treatments included negative control, positive control, antibiotic: 0.15g oxyvet per kilogram of basal diet, Savory essential oil, and Ajwain essential oil ((1g per kilogram of the basal diet). All experimental groups except negative control were challenged with 1 mL of suspension solution containing 1×107 CFU/mL Salmonella Enteritidis bacteria by oral gavage in the ninth week. Quantitative and qualitative parameters were evaluated at the end of each week, and before and after the challenge, respectively. Challenge with Salmonella Enteritidis had no significant effect on laying hen performance and egg quality. Before the challenge, antibiotic and essential oils of two medicinal plants reduced feed intake and egg weight compared to the control group; and reduced feed intake and feed conversion ratio after the challenge (P<0.05). In the pre-challenge period, all three treatments, especially the essential oil of Ajwain, reduced the albumen Haugh unit (P<0.05). After the challenge, Savory essential oil reduced yolk cholesterol content; and essential oils of two medicinal plants decreased yolk lipid oxidation in both pre- and post challenge periods (P<0.05). The results of this study showed that the essential oils of two medicinal plants increase the quality of produced eggs by reducing egg yolk MDA and cholesterol levels.

Keywords

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