Document Type : Original Article
Authors
1
1Department of Poultry and Fish Production, Faculty of Agriculture, Menoufia University, Shibin El – Kom, Egypt.
2
Department of Poultry and Fish Production, Faculty of Agriculture, Menoufia University, Shibin El – Kom, Egypt.
3
Poultry Production Department, Faculty of Agriculture, Menoufia University Shibin El-Kom, Egypt.
4
Department of Poultry and Fish Production, Faculty of Agriculture, Menoufia University, Shibin El – Kom, Egypt.
Abstract
A total of one hundred and twenty unsexed, one-day-old Ross 308 broiler chicks were randomly allocated and divided evenly into 4 dietary treatment groups. Every group was represented by birds in 3 replicates of 10 chicks apiece. Broiler chicks were fed dietary treatments as: T1, basal diet without supplementation (control), T2, T3, and T4, fed a basal diet with 0.05, 0.10, and 0.15 g yeast/ kg diet, respectively, throughout the period of 1- 42 days of age. Ad libitum water and feed were supplied during the experimental period. The results indicated that: birds fed diets supplemented with yeast (Saccharomyces cerevisiae, Sc.) achieved the highest body weight gain, the best rate of feed conversion ratio, with a significant decrease in feed intake compared to birds in the control treatment. The percentage of dressing, weight of certaingiblets and weight of some immune organs in the treated birds fed on diets supplemented with yeast were greater compared to the control group birds, and the best of them were the birds of the fourth treatment fed on 0.15 g yeast/ kg of diet at 42 days of age. Adding yeast atvariedlevels (0.05, 0.10, 0.15 g yeast/ kg diet) to the diet led to anote worthy increase (P ≤ 0.05) in some blood serum components (total protein, globulin, high-density lipoprotein (HDL) and glutathione peroxidase (GPx) activity) and a significant decrease (P ≤ 0.05) in the level of total lipids and total cholesterol, low-density lipoprotein (LDL) and malondialdehyde (MDA) activity in the blood serum of birds compared to the control group. The concentrations of immunoglobulin (IgA, IgM, and IgG) in the blood serum of birds fed the diets supplemented with yeast were significantly improved (P ≤ 0.05) compared to the control group. The number of harmful bacteria decreased significantly (P ≤ 0.05) while the number of beneficial bacteria increased significantly (P ≤ 0.05) in the intestines of birds fed the diet supplementation with yeast compared to the control group. Histological measurements in the intestines of treatment birds fed on diets supplemented with Sc. showed a significant increase (P ≤ 0.05) in the height and width of the villi and a significant decrease (P ≤ 0.05) in the depth of the villi compared to control birds. Economic effectiveness and relative economic efficiency improved by adding yeast (Saccharomyces cerevisiae) at varying levels to the feed, and the highest values were discovered in the fourth treatment (0.91, 146.77, respectively) to which 0.15 g yeast/ kg diet was added versus the control group (0.62, 100, respectively). In general, based on the results obtained from the experiment, from a nutritional and economic perspective, it can be recommended to add yeast (Saccharomyces cerevisiae) to broiler chick diets at a rate of 0.15 g yeast/ kg diet - to obtain the best growth performance, carcass characteristics, oxidative and immune status, and intestinal health, without any negative effects on the health of broiler chicks under the conditions
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