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Asian-Australas J Anim Sci > Accepted Articles
DOI: https://doi.org/10.5713/ajas.19.0263    [Accepted] Published online August 3, 2019.
Replacement value of cassava for maize in broiler chicken diets supplemented with enzymes
Edwin Peter Chang'a1,*  , Medani Eldow Abdallh1  , Emmanuel Uchenna Ahiwe1  , Said Mbaga4  , Ze Yuan Zhu1  , Fidelis Fru Nji3  , Paul Ade Iji3 
1University of New England, School of Environmental and Rural Science, Department of Animal Science, Armidale, New South Wales 2351, Australia
2Tanzania Livestock Research Institute, P.O. Box 352, TALIRI-Mabuki, Mwanza, Tanzania
3DSM Nutritional Products, Animal Nutrition and Health, 30 Pasir Panjang Road #13-31Mapletree Business City, 117440, Singapore
4Sokoine University of Agriculture, P.O. Box 3004, Morogoro, Tanzania
5University of Khartoum, Department of Poultry Production, 13314, Khartoum, Sudan
6College of Agriculture, Fisheries & Forestry, Fiji National University, Suva, Fiji
7Department of Animal Science and Technology, Federal University of Technology, Owerri, Imo State, 1526, Nigeria
Correspondence:  Edwin Peter Chang'a, Tel: +61-434033787, Fax: +61-2-6773-3543, Email: edwinchanga4@gmail.com
Received: 1 April 2019   • Revised: 22 May 2019   • Accepted: 16 July 2019
Pellet durability, particle size distribution, growth response, tibia bone characteristics and energy retention were measured to evaluate cassava as an alternative energy source to replace maize in broiler diets with or without Ronozyme (A+VP) enzyme composites.
A total of 480 one-day broiler chicks were randomly assigned to 8 treatments in a 4 × 2 factorial arrangement. Four levels of cassava: (0, 25, 50, 75%) and 2 levels of enzymes (0 and 500 g/tonne) were used. Each treatment was replicated six times, with ten birds per replicate.
The particle size distribution in the diets showed an increasing trend of small particles with increase in cassava level. Pellet durability decreased (p<0.05) with cassava inclusion. Feed intake was highest in birds fed diets with medium cassava level at 1-24d and 1-35d of age. The BWG of birds reduced (p<0.037) as cassava level increased, but it increased (p<0.017 when enzymes were added. The FCR was high (p<0.05) when cassava level was increased, but it reduced (p<0.05) when enzymes were added. The dressing percentage (DP), and weight of drumsticks reduced (p<0.05) with increasing cassava level. Enzyme supplementation increased (p<0.05) DP, and weight of breast, thighs and drumsticks. Ash content, weight, length, width and bone strength decreased (p<0.05) when cassava level was increased, however, they were increased with enzyme addition. The contents of Ca, K and Zn were raised (p<0.001) with increasing cassava level. Enzyme inclusion increased (p<0.001) all mineral contents in tibia bones. Body fat and energy retained as fat decreased (p<0.001) as cassava level increased. Enzyme inclusion increased (p<0.05) body protein content and ERp.
Although broiler performance was depressed by high levels of cassava inclusion, but it was not affected with low levels, which further improved by enzyme supplementation.
Keywords: Bone Quality; Cassava; Energy Retention; Maize; Meat Yield; Performance

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