Effect of dietary protein and lysine levels on growth performance and immune response in broiler chicks

M, Orma

doi:10.21608/mvmj.2010.183689

Effect of dietary protein and lysine levels on growth performance and immune response in broiler chicks

Document Type : Original Articles

Author

Orma M

10.21608/mvmj.2010.183689

Abstract

The present worle was carried out to study the effect of decreasing the dietary pro tein content by 10% (LCP- diet) with supplementation of lysine (0, 0.2, and 0.4%) over the recommended level in broiler diets on growth performance, carcass traits, blood me tabolites, immune response. One day old Cobb chicks (120) were used. The chicks were distributed randomly into 4 groups and fed 23% or 20.7% CPfor the starter diets,20 or 18.2% CP for the grower and 18 or 16.2% CPfor thefmisher diets with different dietary lysine level (1.1, 1.29 or 1.48%)jor starter diets, 1, 1.22 or 1.4%jor the grower diet and 0.85, 1.05 or 1.25%for thefmisher diets, respectively and 3200 Kcal ME/Kg. The chicles were vaccinated against Avian influenza. Newcastle and Gumboro diseases at proper time. The growth performance indices (body weight,jeed intake andjeed con version ratio) were measured. Blood samples were collectedjrom the broilers at 14, 21 and 28 days of age without anticoagulant for separation of sera to detect titer of anti bodies against Newcastle disease vaccine using haemagglutination inhibition test (HI) as indicative of birds immune response in the different experimental groups and also at 42 days of age, blood samples collected for determination of serum metabolites. At the end of the experiment, 5 chicles from each group were slaughtered to obtain some of the carcass traits. The results revealed that body weight and feed conversion ratio of the broiler fed 10% LCP-diet supplemented with 0.4% lysine above that recommendedfor the broilers significantly improved on comparison to those fed the LCP diets supplemented with 0, 0.2% lysine. Feeding the.broiler chicks the LCP-diet decreased the body weight gain and increased the feed conversion ratio. The abdominal fat % in the carcass of the broiler chicles fed LCP-diet supplemented with 0.4% lysine were lower than those jed on the diets supplemented with 0, 0.2% lysine. Feeding LCP-diet supplemented with 0.4% lysine increased serum total protein, albumin, and globulin and decreased serum total lipids, cholesterol, triglycerides, low density lipoprotein and high density lipopro tein. It can be concluded that feeding the broiler chicks on LCP-diet supplemented with 0.4% lysine diet resulted in better growth performance, lower total lipids, cholesterol

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