_1757587759 20250911104919000 Rovedar Daryoushbabazadeh@gmail.com Rovedar Journal of World’s Poultry Science J. World's Poult. Sci. 2980-7999 09 01 2025 4 3 Joy Orife Jacob Eze https://orcid.org/0009-0002-6935-2584 Jacob Chinenye Raymond Eze https://orcid.org/0009-0009-0168-0144 Michael Chikezie Ugwuene https://orcid.org/0009-0009-2988-4018 Introduction: Performance characteristics, carcass yields, organ proportions, and economic aspects of production are statistical indicators that can be utilized to assess the protein and amino acid ratios responsible for reducing ammonia emissions in turkey waste, while simultaneously optimizing yield outcomes at the lowest feasible costs. The present study aimed to accurately identify the optimal combination of crude protein (CP) and amino acids to enhance performance and carcass yield, reduce production costs, and minimize ammonia excretion.Materials and methods: A total of 360 grower turkeys were randomly assigned to a completely randomized design. In the present study, each treatment group consisted of four sub-replicate groups, each containing ten poults per replicate. The local turkeys were assigned to nine different treatment diets, including T1 with 22% CP, 0.1% methionine, and 0.2% lysine, T2 with 22% CP, 0.2% methionine, and 0.4% lysine, T3 with 22% CP, 0.3% methionine, and 0.6% lysine, T4 with 20% CP, 0.1% methionine, and 0.2% lysine, T5 with 20% CP, 0.2% methionine, and 0.4% lysine, T6 with 20% CP, 0.3% methionine, and 0.6% lysine, T7 with 18% CP, 0.1% methionine, and 0.2% lysine, T8 with 18% CP, 0.2% methionine, and 0.4% lysine, and T9 with 18% CP, 0.3% methionine, and 0.6% lysine.Results: The current findings indicated that the final weight and weight gain in Group T3 were significantly higher than those of the turkeys fed other treatment groups. Turkeys in Group T3 had the best feed conversion ratio, indicating that they utilized diet 3 more effectively for weight gain compared to the other diets. The carcass weight of T3 was significantly higher than that of the other groups, while turkeys in group T7 had a better dress percentage. Carcass protein was significantly higher in T9, while energy content was significantly higher in T3 and T6 compared to other treatments. Group T3 exhibited significantly higher revenue and gross margin compared to all other treatment groups.Conclusion: The levels of amino acids and proteins used in the present study improved growth parameters, carcass characteristics, and organ proportions of turkeys. 09 01 2025 43 49 https://creativecommons.org/licenses/by/4.0 10.58803/jwps.v4i3.78 https://jwps.rovedar.com/index.php/JWPS/article/view/78 https://jwps.rovedar.com/index.php/JWPS/article/download/78/96 https://jwps.rovedar.com/index.php/JWPS/article/download/78/96 Inyeinyang MM, and Ukpong IG. The livestock sector and its contribution to the protein and energy needs of the Nigerian population. Ghana J Agric Sci. 2019; 54(2): 86-97. DOI: 10.4314/gjas.v54i2.9 Odedire JA, and Abegunde TO. Exploitation of unconventional protein sources in the feed of weaner rabbits (Oryctolagus cunniculus Linn.). Nigerian J Anim Prod. 2015; 42(1): 93-99. DOI: 10.51791/njap.v42i1.855 Liu SK, Niu ZY, Min YN, Wang ZP, Zhang J, He ZF, et al. Effects of dietary crude protein on the growth performance, carcass characteristics, and serum biochemical indices of Lueyang black-boned chickens from seven to twelve weeks of age. Rev Bras Cienc Avic. 2015; 17(1): 103-108. DOI: 10.1590/1516-635x1701103-108 Aniebo AO, Wekhe SN, Erondu ES, Owen OJ, Ngodigha EN, and Isirimah NO. Sustainable commercial maggot production (maggotry) for animal and aquafeeds in Rivers State, South South Nigeria. Int J Biotechnol Biochem. 2008; 4(2): 197-205. Adeyemi OA, and Eruvbetine D. Nutritional evaluation of cassava root meal fermented with rumen filtrate in rats. Nigerian J Anim Prod. 2021; 37(2): 207-217. DOI: 10.51791/njap.v37i2.1368 Alli OI, Bolarinwa SA, Chimezie VO, and Sola-Ojo, FE. Effect of garri sievate on egg production of Isa Brown hens. Nigerian J Anim Prod. 2024: 31-35. DOI: 10.51791/njap.vi.6743 Mbajiorgu CA, Ng`ambi JW, Norris D, and Alabi OJ. Effect of dietary lysine to energy ratio on performance of unsexed indigenous Venda chickens. Asian J Anim Vet Adv. 2011; 6(5): 517-524. DOI: 10.3923/ajava.2011.517.524 National research council (NRC). Nutrient requirement of poultry, 9th ed. Washington, DC, USA: National Academy Press; 1994. Available at: https://www.agropustaka.id/wp-content/uploads/2020/04/agropustaka.id_buku_Nutrient-Requirements-of-Poultry_Ninth-Revised-Edition-1994-NRC.pdf Nwagu BI. Production and management of indigenous poultry species. In: Gefu JO, Adeyinka IA, and Sekoni AA, editors. Poultry production in Nigeria. 2002. p. 10-19. United states department of agriculture-natural resources conservation service (USDA-NRCS). Effects of diet and feeding management on nutrient content of manure. Nutrient management technical note No. 1. 2003. p. 1-6. National Root Crop Research Institute (NRCRI). Umudike, Abia State, Nigeria: Meteorological Station Reading; 2000. p. 20. Njeri FM, Sanchez J, Potterson R, Gachuiri CK, and Kiarie EG. Comparative growth performance, gizzard weight, ceca digesta short chain fatty acids and nutrient utilization in broiler chickens and turkey poults in response to cereal grain type, fiber level, and multienzyme supplement fed from hatch to 28 days of life. Poult. Sci. 2023; 102(10): 102933. DOI: 10.1016/j.psj.2023.102933 Aduku AO. Tropical feed stuff analysis table. Ahmadu Bello University, Samaru-Zaria, Nigeria. 2005. Utama CS, Sulistiyanto B, and Haidar MF. Performance and digestibility of grower-stage turkeys fed different forage-based rations. Adv Anim Vet Sci. 2025; 13(4): 892-899. DOI: 10.17582/journal.aavs/2025/13.4.892.899 Shukla M, Bhattacharyya A, Shukla PK, Roy D, Yadav B, and Sirohi R. Effect of Azolla feeding on the growth, feed conversion ratio, blood biochemical attributes and immune competence traits of growing turkeys. Vet World. 2018; 11(4): 459-463. DOI: 10.14202/vetworld.2018.459-463 Lestari GP, Hermana W, and Suci DM. Pemberian Eceng Gondok (Eichhornia crassipes), Indigofera sp dan Kangkung (Ipomea sp) sebagai Hijauan pada Ransum Kalkun Berbasis Dedak Padi dan Ransum Komersial terhadap Performa dan Kadar Kolesterol Daging [The Use of Eichhornia crassipes, Indigofera sp and Ipomea sp. as forage in turkey rations on performance and meat cholesterol]. J Ilmu Nutr Teknol Pakan. 2020; 18(2): 32-37. DOI: 10.29244/jintp.18.2.32-37 Bryan DD, and Classen HL. In vitro methods of assessing protein quality for poultry. Animals. 2020; 10(4): 551. DOI: 10.3390/ani10040551 Babazadeh D, and Ahmadi Simab P. Methionine in poultry nutrition: A review. J World's Poult Sci. 2022; 1(1): 1-11. DOI: 10.58803/jwps.v1i1.1 Baéza E, Guillier L, and Petracci M. Review: Production factors affecting poultry carcass and meat quality attributes. Animals. 2022; 16(1): 100331. DOI: 10.1016/j.animal.2021.100331 Ojewola GS, Abasiellong SF, and Nwachukwu CS. Methionine supplementation in the productive efficiency, carcass characteristics and economics of growing indigenous turkey. Trop J Anim Sci. 2001; 4(2): 161-170. Available at: https://www.ajol.info/index.php/tjas/article/view/49949 Barekatain R, Romero LF, Sorbara JOB, and Cowieson AJ. Balanced nutrient density for broiler chickens using a range of digestible lysine-to-metabolizable energy ratios and nutrient density: Growth performance, nutrient utilisation and apparent metabolizable energy. Anim Nutr. 2021; 7(2): 430-439. DOI: 10.1016/j.aninu.2020.12.003