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Effects of Zinc-methionine and Feed Restriction on Performance, Immunocompetence and Gut Content Osmolarity of Broilers Challenged with a Mixed Coccidial Infection

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Author(s): H. Hamidi | J. Pourreza

Journal: Journal of Biological Sciences
ISSN 1727-3048

Volume: 9;
Issue: 7;
Start page: 669;
Date: 2009;
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Keywords: Broilers | zinc-methionine | feed restriction | immunity | immunoglobulin A | osmolarity

ABSTRACT
An experiment was conducted in which 378 broilers received a basal diet (74 mg kg-1 zinc) supplemented with 0, 40 or 60 mg Zn kg-1 as zinc-methionine (Zn-Met) and with or without early Feed Restriction (FR) to investigate their effects on performance, humoral immunity, intestinal immune responses and gut content osmolarity especially in coccidiosis condition. Chicks consumed feed ad libitum or were restricted on alternate days from 11 to 18 day of age. To simulate a coccidiosis challenge, on day 28 of age the chickens were inoculated with a mixed culture of E. tenella and E. acervulina via drinking water. Antibody response to Sheep Red Blood Cell (SRBC) was determined on day 21. The immunoglobulin A (IgA) content was quantified in sera and mucous membrane tissue of intestine. Ileum and cecum content were measured for osmolarity at 21 and 42 day of age. Zn-Met could not affect average daily gain and feed intake but FR birds that dietary supplemented with 40 or 60 mg kg-1 Zn-Met had significantly (p
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