1. Yitbarek, M.B. and J.C. Okonkwo, 2019. Some selected animal wastes and by-products for poultry feed: Review. Int. J. Agric. Biosci., 8: 242-250.
2. Wariboko, O.N., D.N. Onunkwo, P.N. Nnadi, N.A. Tambari, J.C. Okonkwo and B.C. Kornom, 2019. Haematological and serum indices of rabbits fed RHIZO (Rhizophora mangle) PITH. Int. J. Applied Sci. Eng., 7: 25-28.
3. Wariboko, O.N., D.N. Onunkwo, P.N. Nnadi, B.C. Kornom, N.A. Tambari and J.C. Okonkwo, 2019. Semen characteristics of rabbit buck fed Rhizophora mangle PITH. Int. J. Agric. Bio., 8: 186-189.
4. Wariboko, O.N., D.N. Onunkwo, N.A. Tambari, P.N. Nnadi, B.C. Kornom and J.C. Okonkwo, 2019. Carcass characteristics and organ proportions of rabbits fed diets containing RHIZO (Rhizophora mangle) PITH. Int. J. Agric. Bio., 8: 174-177.
5. Wariboko, O.N., D.N. Onunkwo, N.A. Tambari, B.C. Kornom, P.N. Nnadi and J.C. Okonkwo, 2019. Growth response and apparent nutrient digestibility of rabbits fed RHIZO (Rhizophora mangle) PITH. Int. J. Vet. Sci., 8: 192-194.
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6. Wariboko, O.N., D.N. Onunkwo, B.C.Kornom, N.A. Tambari, P.N. Nnadi and J.C. Okonkwo, 2019. Reproductive and feed efficiency of rabbit does fed diet containing rhizopith. Int. J. Applied Sci. Eng., 72: 22-24.
7. Wariboko, O.N., D.N. Onunkwo, B.C. Kornom, P.N. Nnadi, N.A. Tambari and J.C. Okonkwo, 2019. Reproductive hormonal assay of rabbit does fed Rhizophora mangle PITH. J. Vet. Sci., 8: 195-197.
8. Okonkwo, J.C., J.I. Umegwuagu, I.F. Okonkwo and D.N. Onunkwo, 2019. Effect of sun dried, dehulled and boiled kidney beans on hematological and serum biochemistry of broiler birds. Int. J. Environ., Agric. Biotech., 4: 735-740.
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9. Ezeakacha, E.M., J.C. Okonkwo and B. Ezenyilimba, 2018. Effect of Mimosa diplotricha leaf meal on the organ weights and organoleptic properties of three broiler strains. Niger. J. Anim. Prod., 45: 239-251.
10. Egu, U.N. and J.C. Okonkwo, 2018. Kidney function test, weight gain/body conformation and serum protein values of mature balami rams treated with gonadotrophin (Diclair®) for sperm production. Int. J. Mol. Biol., 3: 65-68.
11. Okonkwo, J.C. and J.C. Uba, 2017. Haematological indices of various breeds of broiler chickens fed Mimosa diplotricha leaf meal. Int. J. Agriic Biosci., 6: 189-192.
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12. Egu, U.N. and J.C. Okonkwo, 2017. Effect of gonadotrophin (diclair®) on semen characteristics, hormonal profile and biochemical constituents of the seminal plasma of mature balami rams. Banat's J. Biotechnol., 8: 90-97.
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13. Umeghalu, I.C.E., I.F. Okonkwo, J.C. Okonkwo and J.O. Ngini, 2016. Performance evaluation of cumulative biogas yield from yellow yam waste co-digested with cow paunch in batch mode. Int. J. Agric. Biosci., 4: 35-37.
14. Umeghalu, I.C.E. and J.C. Okonkwo, 2016. Comparative evaluation of cumulative biogas yield of yellow yam brute co-digested with cow paunch manure in batch mode. Banat's J. Biotechnol., 7: 89-95.
15. Onwumelu, I.J., O.J. Akpodiete and J.C. Okonkwo, 2016. Economic implications of utilizing yeast treated soya bean in the diets of broiler chickens. Int. J. Vet. Sci., 5: 181-185.
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16. Egu, U.N., J.C. Okonkwo and P.E. Etusim, 2016. Effect of gonadotrophin (Pergonal®) on body size, reproductive characteristics and sperm reserves of mature Ouda rams. J. Agric. Sci. Pract., 1: 65-71.
17. Egu, U.N. and J.C. Okonkwo, 2016. Effect of gonadotrophin (pergonal®) on haematological and serum biochemical parameters of mature ouda rams treated for sperm production. Int. J. Environ. Agric. Res., 2: 74-80.
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18. Egu U.N., J.C. Okonkwo and I.F. Okonkwo, 2016. Effect of gonadotrophin (Pergonal®) on erythrocyte indices, serum protein values and liver/kidney functions of mature West African dwarf rams treated for sperm production. Int. J. Applied Sci. Engr., 4: 27-32.
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19. Umeghalu, I.C.E., E.I.U. Nwuba, I.F. Okonkwo, J.O. Ngini and J.O. Ajaefobi, 2015. Kinetics of biogas production from jackfruit wastes co-digested with cow paunch in batch mode. Agric. Adv., 4: 34-41.
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20. Umeghalu, I.C.E., E.I.U. Nwuba, D.O. Onukwuli, I.F. Okonkwo and J.O. Ngini, 2015. Kinetics of biogas production from fermentation broth of wild cocoyam co-digested with cow paunch in batch mode. Scient. J. Pure Applied Sci., 4: 98-104.
21. Obiakor, M.O., J.C. Okonkwo and C.D. Ezeonyejiaku, 2015. Trace metal contamination in tropical endemic fish: Factorial effect interactions and in situ quantitative risk assessment. J. Environ. Occupat. Sci., 4: 10-21.
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22. Egu, U.N. and J.C. Okonkwo, 2015. Haematological and serum biochemical parameters of mature balami rams treated with human menopausal gonadotrophin (Diclair) for spermatogenesis. Int. J. Agric. Biosci., 4: 266-271.
23. Samy, R.P., J. Manikandan, G. Sethi, O.L. Franco and J.C. Okonkwo et al., 2014. Snake venom proteins: Development into antimicrobial and wound healing agents. Mini-Rev. Organic Chem., 11: 4-14.
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24. Onwumelua, I.J., O.J. Akpodiete and J.C. Okonkwo, 2014. Carcass, organ and organoleptic characteristics of broilers fed yeast treated raw soya bean and full fat soya bean. Scient. J. Zool., 3: 7-16.
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25. Okonkwo, I.F., J.C. Okonkwo and F.J.C. Odibo, 2014. Purification of Aspergillus flavus enzyme using ion exchange and gel filtration technique. Aarjmd Asian Acad. Res. J. Mult., 1: 563-574.
26. Obiakor, M.O., J.C. Okonkwo, C.D. Ezeonyejiaku and C.N. Okonkwo, 2014. Polycyclic aromatic hydrocarbons (pahs) in freshwater media: Factorial effects and human dietary exposure risk assessment. Resour. Environ., 4: 247-259.
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27. Obiakor, M.O., J.C. Okonkwo and C.D. Ezeonyejiaku, 2014. Genotoxicity of freshwater ecosystem shows DNA damage in preponderant fish as validated by in vivo micronucleus induction in gill and kidney erythrocytes. Mutat. Res./Genet. Toxicol. Environ. Mutagen., 775-776: 20-30.
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28. Nwoye, C.I., I.C.E. Umeghalu, S.E. Ede, N.I. Amalu, W.C. Onyia and N.E. Idenyi, 2014. Quadratic yield response of methane gas to input ratio of organic loading rate and hydraulic retention time during microbial digestion of fruit wastes. Biomed. Biotechnol., 2: 93-101.
29. Nsofor, C.I., O.O. Ikpeze, U.C. Ngenegbo, C.F. Ikeogu and J.C. Okonkwo, 2014. Histopathological alterations in the liver and kidney of the fish Chrysichthys nigrodigitatus due to heavy metals in Niger river. J. Natural Sci. Res., 4: 11-18.
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30. Allanah, T.O., J.C. Okonkwo and S.I. Omeje, 2014. Fertility and hatchability characterization of three strains of egg type chickens. Scient. J. Biol. Sci., 3: 59-68.
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31. Umeghalu, I.C.E., J.O. Ngini and E.C. Chukwuma, 2013. Challenges and prospects of lower Anambra river irrigation project Omor Anambra state. Int. J. Agric. Biosci., 2: 141-143.
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32. Umeghalu, I.C.E., J.C. Okonkwo, J.O. Ngini and E.C. Chukwuma, 2013. Impact of anambra state tractor and equipment hiring scheme on mechanization of rice production in anambra state nigeria: An appraisal. J. Appl. Agri. Res., 5: 61-71.
33. Obinne, J.I., F.U.C. Mmereole and J.C. Okonkwo, 2013. Response and haematological parameters of juvenile rabbits fed concentrate diets supplemented with varying levels of Tridax procumbens. Sci. J. Anim. Sci., 2: 310-315.
34. Obiakor, M.O., J.C. Okonkwo, C.D. Ezeonyejiaku and C.O. Ezenwelu, 2013. Physicochemical and heavy metal distribution in freshwater column: Season location interaction effects and public health risk. J. Life Sci. Biomed., 3: 308-317.
35. Eze, J.N., O.J. Akpodiete, J.C. Okonkwo and D. Eruvbetine, 2013. Cost benefit analysis and effects of feed preference on performance of giant African land snail (Archachatina marginata) reared intensively. J. Applied Agri. Res., 5: 83-90.
36. Ahaotua, E.O., J.C. Okonkwo, R.E. Uwalaka and J.P. Ihezuo, 2013. Effect of processed wild cocoyam corn meal (Caladiumbicolor) on the growth and carcass characteristics of broiler birds. Sci. J. Anim. Sci., 2: 304-309.
37. Ahaotu, E.O., J.C. Okonkwo, P.N. Onu and V.N. Okonkwo, 2013. Performance and economic analysis of broiler chicks fedenzyme supplemented heat treated goat manure-baseddiets, GRA-Global. Res. Anal., 2: 14-17.
38. Uzokwe, U.N. and J.C. Okonkwo, 2012. Survival strategies of women farmers against climate change in delta state and implicationfor extension services. Int. J. Sci. Res., 1: 1-4.
39. Umerie, S.C., J.C. Okonkwo, N.H. Okorie and B.O. Ibekwe, 2012. Improving qualities of oils from Elaeis guineensis species by processing with Nelsonia canescens Linn spreng (Acantheceae) leaves. Int. J. Curr. Res. Rev., 4: 6-10.
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40. Umeghalu, I.C.E., J.C. Okonkwo and E.I.U. Nwuba, 2012. Modern technologies and nigerian’s small scale farmers: Constraints and prospects of its adoption. Sci. J. Agri., 1: 68-73.
41. Umeghalu, I.C.E. and J.C. Okonkwo, 2012. Mitigating the effect of climate change on Nigerian agricultural productivity. Scient. J. Agric., 1: 61-67.
42. Umeghalu, C.E., E.C. Chukwuma, I.F. Okonkwo and S.O. Umeh, 2012. Potentials for biogas production in Anambra State of Nigeria using cow dung and poultry droppings. Int. J. Vet. Sci., 1: 26-30.
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43. Onwumelu, I.J., J.C. Okonkwo and O.J. Akpodiete, 2012. Growth response of broiler chickens fed gradedlevels of yeast treated raw soya bean and full fat soya bean. Acta Argic. Slov., 100: 47-57.
44. Olele, N.F., P. Tawari-Fufeyin and J.C. Okonkwo, 2012. Reproductive biology of freshwater prawn Macrobrachium vollenhovenii (Herklot, 1857) caught in Warri River. Arch. Zootech., 15: 41-57.
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45. Olele, N.F. and J.C. Okonkwo, 2012. Replacement of fish meal with graded levels of earthworm meal in the diet of fingerlings: Effect on feed and growth parameters. J. Agric. Sci. Technol., 2: 901-908.
46. Obiakor, M.O., J.C. Okonkwo, P.C. Nnabude and C.D. Ezeonyejiaku, 2012. Eco-genotoxicology: Micronucleus assay in fish erythrocytes as in situ aquatic pollution biomarker: A review. J. Anim. Sci. Adv., 2: 123-133.
47. Chukwuma, E.C., C. Nzedegwu, A.O. Nwoke, I.C.E. Umeghalu and J.N. Chukwuma, 2012. Comparative evaluation of co-digestion of cow, pig and poultry droppings. J. Agric. Eng. Technol., 20: 200-206.
48. Okonkwo, J.C., M.O. Obiakor and P.C. Nnabude, 2011. Micronuclei profile an index of chromosomal aberrations in freshwater fishes (Synodontis clarias and Tilapia nilotica). Online J. Anim. Feed Res., 1: 40-45.
49. Okonkwo, J.C., I.S. Omeje and I.F. Okonkwo, 2011. Effect of source and sex on blood protein fractions of West African Dwarf Goats (WADG). Res. Opin. Anim. Vet. Sci., 1: 158-161.
50. Okonkwo, J.C., I.F. Okonkwo and U.E. Godday, 2011. Effects of breed, sex and source within breed on the haematological parameters of the Nigerian goats. Online J. Anim. Feed Res., 1: 8-13.
51. Okonkwo, J.C., 2011. Land and Agricultural Productivity. In: Essentials of Geography and Meteorology, Obienusi, E., B. Osuiwu and N. Igu (Eds.)., Allied Micro Production, Awka, Nigeria.
52. Ebenebe, C.I., O. Itefue, T.C. Ebere-Ohameje and J.C. Okonkwo, 2011. Fortification of the nutritive value of mushroom (Termitomyces microcarpus) with paw-paw leaf meal for broiler chicks diet. Pak. J. Nutr., 10: 155-158.
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53. Afomezie, P.I., C.I. Ebenebe, O.O. Njoku, A.N. Ufele and J.C. Okonkwo, 2011. Effects of different soil treatments on weight gain, shell length and shell aperture of snails (Archachatina marginata). Pak. J. Nutr., 10: 151-154.
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54. Umerie, S.C., I.F. Okonkwo, N.A. Nwadialor and J.C. Okonkwo, 2010. Studies on the oil and nutritive value of seeds of Crotoalaria retusa L. (Fabaceae). Pak. J. Nutr., 9: 912-914.
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55. Okonkwo, J.C., I.S. Omeje, I.F. Okonkwo and I.C.E. Umeghalu, 2010. Effects of breed, sex and source within breed on the blood bilirubin, cholesterol and glucose concentrations of Nigerian goats. Pak. J. Nutr., 9: 120-124.
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56. Okonkwo, J.C., I.S. Omeje and U.N. Egu, 2010. Identification of X-chromatin and determination of its incidence in Nigerian goat breeds. Livest. Res. Rural Dev. Vol. 22. .
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57. Okonkwo, J.C., I.F. Okonkwo, S.C. Umerie, N.J. Ubaduba and G.U. Anene, 2010. Haematological profiles of West African Dwarf Goat (WADG) of the rainforest ecological zone of Southern Nigeria: Sex and breed effects. J. Environ. Res. Policies Duncan Sci., 5: 22-39.
58. Okonkwo, J.C., I.F. Okonkwo and S.C. Umerie, 2010. Replacement of feed concentrate with graded levels of cassava leaf meal in the diet of growing rabbits: Effect on feed and growth parameters. Pak. J. Nutr., 9: 116-119.
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59. Okonkwo, J.C., D.O. Amaefule and U.N. Egu, 2010. Relationship between body weight and other biometric characteristics of the Nigerian goat breeds. Int. J. Anim. Sci., 2: 102-106.
60. Okonkwo, J.C. and M.O. Obiakor, 2010. Karyological and chromosomal studies of catfish (Clariidae, Clarias gariepinus, Burchell, 1822) from Anambra basin, Anambra state, Nigeria. Pak. J. Nutr., 9: 112-115.
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61. Obiakor, M.O., J.C. Okonkwo, C.D. Ezeonyejiaku and C.O. Ezenwelu, 2010. Genotoxicology: Single and joint action of copper and zinc to Synodontis clarias and Tilapia nilotica. J. Appl. Sci. Environ. Manage., 14: 59-64.
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62. Obiakor, M.O., I.F. Okonkwo, S.C. Umerie and J.C. Okonkwo, 2010. Pollution survey of lagos lagoon and its environmental consequences. J. Environ. Res. Policies, 5: 28-38.
63. Eze, J.N., D. Eruvbetine, O.J. Akpodiete and J.C. Okonkwo, 2010. Feeding pattern, carcass and shell qualities of snails (Archachatina marginata) fed different materials. J. Innovative Res. Eng. Sci., 1: 111-120.
64. Umerie, S.C., J.C. Okonkwo and A.F. Okorie, 2009. Utilization of african yam beans (Sphenostylis stenocarpa) and guinea corn (Sorghum vulgare) in weaning food. Nat. Applied Sci. J., 10: 121-127.
65. Okonkwo, J.C., I.F. Okonkwo and I.J.N. Achufusi, 2009. Prevalence of bacteria infections and bio safety in poultry farms. J. Agric. Sci. Natl. Res., 2: 27-37.
66. Okonkwo, J.C., 2009. Effects of breed and storage duration on the beta-carotene content of egg yolk. Pak. J. Nutr., 8: 1629-1630.
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67. Umeghalu, I.C.E. and D.O. Amaefule, 2008. The challenge of African rice gall midge to rice production in the Omasi rice ecosystem Anambra state Nigeria. J. Eng. Applied Sci., 4: 134-138.
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68. Okonkwo, J.C. and M.O. Obiakor, 2008. Morphometric studies of Clarias gariepinus, Burchell, 1822 (Pisces, Claridae) from Anambra river basin, Anambra state, Nigeria. Natl. Applied Sci. J., 9: 329-335.
69. Achufusi, J.N., B.N. Emelugo and J.C. Nwafor, 2008. Isolation, characterization and propagation of bakers yeast from local palmwine (Elaeis guinensis). J. Biomed. Invest., 6: 24-28.
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70. Okonkwo, J.C., I.S. Omeje, I.F. Okonkwo and P.C. Onwuemesi, 2007. A preliminary study of some blood biochemical indices of the West African Dwarf Goats (WADG) of Southern Nigeria. J. Chem. Soc. Nig., 1: 44-48.
71. Okonkwo, J.C., I.S. Omeje, I.F. Okonkwo and F.U. Mmereole, 2007. Blood protein and its various fractions in the West African dwarf goats (WADG) of the humid tropics. Natural Applied Sci. j., 8: 8-13.
72. Umerie, S.C., A.N. Okpalaononuju, J.C. Okonkwo and S.C. Nwobi, 2006. The pesticidal effects of four different plant leaves: Lantana camara, Ocimun bacilicum (sweet basil), Micromelum pubecens (curry) and Ociumum viridis (scent plant) on beans and maize weevils. Natural Applied Sci. J., 7: 145-150.
73. Okonkwo, J.C., I.F. Okonkwo and P.C. Onwuemesi, 2006. Genetic correlation between egg quality traits. Natl. Applied Sci. J., 7: 33-36.
74. Okonkwo, I.F., R.A.U. Nwobu and J.C. Okonkwo, 2006. Antimicrobial activities of Ceiba pentandra. Natl. Applied Sci. J., 7: 166-168.
75. Achufus, I.J., R.A. Nwobu and J.C. Okonkwo, 2006. Tinea capitis among primary school children in onitsha north and ogbaru local government areas of anambra state, Nigeria. J. Biomed. Invest., 4: 28-31.
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76. Okonkwo, J.C. and I.F. Okoye, 2005. Genetic engineering of plant architecture. Natl. Applied Sci. J., 6: 82-88.
77. Okonkwo, J.C. and I.F. Okoye, 2005. Effect of forage on water consumption of the rabbit. Natl. Aapplied Sci. J., 6: 26-29.
78. Adegbola, T.A. and J.C. Okonkwo, 2002. Nutrient intake, digestibility and growth rate of rabbits fed varying levels of cassava leaf meal. Nig. J. Anim. Prod., 29: 21-26.
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79. Okonkwo, J.C. and S.N. Ibe, 1994. Repeatability of egg number and egg quality traits in commercial pullets. J. Nig. Soc. Anim. Prod., 21: 71-75.
80. Ibe, S.N. and J.C. Okonkwo, 1994. Relationship between laying age and repeatability of egg quality traits. J. Nigerian Soc. Anim. Prod., 21: 66-70.