1. Ajala AO, Ogunjimi SI, Famuwagun OS and Adebimpe AT. 2021. Poultry production in Nigeria: exploring its potentials for rural youth empowerment and entrepreneurship. Nigerian Journal of Animal Production, 48(10):114-123. Doi:10.51791/njap.v48i1.2890.
2. Adeyonu A, Okunola A., Alao M., Oyawoye E and Okonkwo C. 2021. An assessment of broiler value chain in Nigeria. Open Agriculture, 6 (1) 296-307. Doi:10.515/opag-2020-0168.
3. Odubote K. 2015. The Local Chickens Of Nigeria-A Review. https://www.researchgate.net/publication/276058544 (accessed 6.4.2024). Doi:10.13140/RG.2.1.2193.5520.
4. Adeleke MA, Bello KO, Akinyemi IO, Irekhore OT, Ilori BM, Adeyeye OA and Famakinde SA. 2022. Morphological variations of qualitative and quantitative traits of Fulani ecotype chickens in Nigeria. Genetika 54 (1): 43-62. Doi:10.2298/GENSR2201043A.
5. Giraudeau M, Duval C, Guillon N. 2010. Effects of access to preen gland secretions on mallard plumage. Nature weissen schaften, 97(6) 577-581. Doi:10.1007/s00114-010-0673-z.
6. Reynolds SM, Castro I, Alley MR. 2017. Apteryx Spp. (Kiwi) possess an uropygial gland: Anatomy and Pathology. European Journal of Anatomy. 21 (2): 125-139.
7. Ushakumary S, Venkatesan S, Sabiha HB. 2011. Histoloy and histochemistry of the preen gland in guinea fowl. Indian Veterinary Journal, 88(6), 132–134.
8. Harem I, Kocak M, Kozlu T. 2010. Histologic Structure of the Uropygial Gland of the Osprey(Pandion haliaetus ). Journal of Zoo Wildlife Medicine, 41(1), 147–150. Doi:10.16.1638/2008-0205.1.
9 Sandilands V, Powell K, Keeling LJ, Savory J. 2004. Preen gland function in layer fowls: Factors affecting preen oil fatty acid composition. British Poultry Science, 45 (1):109-15. Doi:10.1080/0071660410001668932.
10. Moreno-Rueda G. 2017. Preen oil and bird fitness: a critical review of the evidence. Biological Reviews. Doi:10.1111/brv.12324.
11. Rajathi S, Ashok N, Kumaravel A, Muthkrishnan S. 2013. Histological Development of papilla of preen gland in Duck. Indian Journal of Veterinary Anatomy, 90 (7): 56-58.
12. Al-khazraji KI. 2017. Histological and Morphological study of the Uropygial gland in Gull (Larus canus). Diyala Journal of Pure Science, 13 (3): 230-239. Doi:10.24237/djPS.1303.308a.
13. Johnston DW. 1988. A morphological atlas of the avian gland. Bulletin of the British Museum of Natural History. Zoology, 54, 199–259.
14. Moller AP, Laursen, K. 2019. Function of the Uropygial gland in eiders (Somateria mollissima). Avian Research 10, 24. Doi:10.1186/s40657-019-0163-8.
15. Jawad HSA, Naji LHBI, Bakar SA. 2015. Partial Ablation of Uropygial Gland Effect on Production Performance of Akar Putra Chicken. International Journal of Poultry Science, 14 (4), 213–221. Doi:10.3923/ijps.2015.213.221.
16. Das LN, Mishra DB, Biswal G. 1962. Comparative anatomy of the domestic duck (Anas bochas). Indian Veterinary Journal, 42: 320-326.
17. Delius JD. 1988. Preening and associated comfort behavior in birds. Annals of New York Academy of Sciences 525: 40–55. Doi:10.1111/j.1749-6632.1988.tb38594.x.
18. Cotgreave P, Clayton DH. 1994. Comparative-analysis of time spent grooming by birds in relation to parasite load. Behaviour, 131 (3-):171–187. Doi:10.1163/156853994X00424.
19. Van LDW, Bokma S. 1987. Short-term feather maintenance as a function of dust-bathing in laying hens. Applied Animal Behaviour Science, 18, 197—204. Doi:10.1016/0168-1591(87)90193-6.
20. Shawkey MD, Pillai SR, Hill GE. 2003. Chemical Warfare Effects of Uropygial Oil on Feather Degrading Bacteria. Avian Biology, 34 (4):345–349.
21. Stettenheim PR. 2000. The integumentary morphology of modern birds – an overview. Am Zoology, 40, 461–477. https://academic.oup.com/icb/article/40/4/461/101379.
22. Wanmi N, Samuel MO, Byanet O. 2016. Morphormetric Study of the Forebrain and Cerebellum of the Wild Rock Pigeon (Columba livia). International journal of Vet. Sci. 5(3): 118-121.
23. Gosomji IJ, Salami SO, Nzalak JO, Kawu MU, Tizhe E.M, Gurumyem YG, Dung EC.2015. Morphological Development of the Gastrointestinal Tract Of Helmeted Guinea Fowl (Numida meleagris) at Pre-Hatch and Post-Hatch. Journal of Vet. Anatomy 8(2)17 – 27. Doi:10.1155/2016/9827956.
24. Sara Q, Cecilia M, Chiara, D, Alexandra MG, Giovanni D. 2006. Adaptive evolution of secretory cell lines in vertebrate skin. Caryologia, 59 (2): 187-206. Doi:10.1080/00087114.2006.10797915.
25. Mobini B, Ziaii A. 2011. Comparative histological study of the preen of broiler and native chicken. Journal of Veterinary Microbiology 6 (2 (20)): 121–128.
26. Rajathi S, Ashok N, Kumaravel A, Muthukrishnan S. 2014. Post hatch micrometrical development of the preen gland in the duck. Indian Veterinary Journal. 91 (7) : 51-53.
27. Sadoon AH. 2011. Histological study of European Starling uropygial gland (Sturnus vulgaris). International Journal of Poultry Science, 10 (8): 662–664. Doi:10.3923/ijps.2011.662.664.
28. Hassanin A, Shoeib M, Massoud D. 2021. Micro and Macroanatomical features of the uropygial gland of duck (Anas platyrrhynchos) and pigeon (Columba livia). Biotechnic and Histochemistry, 96 (93), 213-222. Doi:10.1080/10520295.2020.1782990.
29. Isbilir F, Avci Kupeli Z, Isbilir I, Arican I, Ozyigit O. 2024. Macroscopic and microscopic characteristics of uropygial gland of Budgerigars (Melosittacus undulatus). Turkish Journal of Veterinary Research, 8 (1): 43-51. Doi:10.47748/tjvr.1393777.
30. Sawad AA. 2006. Morphological and histological study of uropygial gland in moorhen (G. gallinula C. choropus). International Journal of Poultry Science, 5 (10): 938–941. Doi:10.3923/ijps.2006.938.941.
