Effects of Hydrolyzed Cottonseed Meal on Performance, Ileal Digestibility of Protein and Essential Amino Acid and Some Immune Responses of Broiler Chicks

Mohammadrezaei, Mohammad (2020) Effects of Hydrolyzed Cottonseed Meal on Performance, Ileal Digestibility of Protein and Essential Amino Acid and Some Immune Responses of Broiler Chicks. Doctoral thesis, University of Mohaghegh Ardabili.

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Abstract

Research Aim: The main objectives of the outlined studies were to quantify the optimum inclusion rate of hydrolyzed cottonseed meal as an alternative to antibiotic growth promoter, and also to utilize hydrolyzed cottonseed meal to reduce the level of crude protein in broiler chickens' diet. A total number of 1320-day-old broiler chicks were used in 4 separate experiments. In the first experiment, the hydrolyzed cottonseed meal was evaluated physically and chemically. Then, the second experiment was conducted to quantify the optimum inclusion rate of the products by feeding diets containing zero to 20 g/kg of feed hydrolyzed cottonseed meal. The two levels that showed the best growth performance in the second experiment were selected and evaluated in the third experiment along with two levels of dietary crude protein reduction. In the fourth experiment, the same two levels were compared with an antibiotic growth promoter. The entire production cycle in each of these experiments was from day 1 to 35. Growth performance, economic performance, ileum digestibility of protein and amino acid, immune system responses, amino acids and biochemical parameters of blood serum, carcass characteristics and internal organs relative weight were the response measures evaluated in all the studies. The results obtained showed that hydrolyzed cottonseed meal at 15 and 20 g/kg of feed can improve growth performance as a growth stimulant, improve protein and amino acids digestibility, stimulate immune system responses, increase serum antioxidant capacity, improve carcass yield, and reduce carcass fat deposition, enhance economic efficiency, improve gut morphological characteristics and microflora profile. Conclusion: In concussion, enzymatically hydrolyzed cottonseed meal may be used as an alternative to antibiotic growth promoter to improve performance, immune and physiological responses, in diets with lower crude protein than the standard levels.

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