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Abstract
Photoperiod is considered to be one of the most effective environmental factor in controlling the reproductive cycle and gonadal maturation in some mammalian species, but very limited information are available on its effects on reproductive biology of the guinea fowl. Therein, we investigated the effects of varying photoperiodic treatments on morpho-biometry of the excurrent duct system of helmeted guinea fowl (Numida meleagris). A total of twenty-one (21) apparently healthy sexually-matured helmeted guinea fowls were randomly assigned into three (3) photoperiodic regimes; mainly [Group I: Short daylight (SD; 8 HL (Hour of light, Group II: Moderate daylight (MD; 12 HL) and Group III: Long daylight (LD; 16 HL)] of seven birds per group (n=7). After 8 weeks of experimentation, the excurrent ducts were excised and freed of all adhering connective tissues for gross-morphological and morphometric evaluations. The bio-morphometric data (weight and diameter) were significantly increased (p< 0.05) in the epididymis and ductus deferens of guinea fowl exposed to 16 HL, as compared to other treatments. However, no significant (p> 0.05) effect was observed in body weight and length of the excurrent ducts regardless of photoperiod. The observed changes in weight and diameter of the epididymis and ductus deferens of helmeted guinea fowl are thus a consequence of the stimulatory effects of long photoperiod exposure to reproductive activity. Thus, these findings would therefore be useful to guinea fowl breeders in designing appropriate intervention programs necessary to improve their reproduction efficacy and to preserve this species.
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References
- Abdul-Rahman, I.I., Robinson, J.E., Obese, F.Y., Jeffcoate I.A. and Awumbila, B. (2016). Effects of season on the reproductive organ and plasma testosterone concentrations in guinea cocks (Numida meleagris). Poult. Sci., 95(3):636-644. https//doi.org/ 10.3382/ps/ pev342
- Abdul-Rahman, I.I. and Jeffcoate I.A. (2018). Histological structure and age-related changes in the luminal diameter of the excurrent duct system of guinea cocks (Numidameleagris) and associated changes in testosterone concentrations. Can. J. Vet. Res., 82(1):60-65.
- Aire, T.A., Ayeni, J. S. O. and Olowo-Okorun, M. O. (1979). The structure of the excurrent ducts of the testis of the guineafowl (Numida meleagris). J. Anat., 129(3): 633-643.
- Assia, T. and Boulakoud, S.M. (2014). The Effect of Melatonin on Reproductive Parameters inPigeon Columba liviaExposed toDifferent Photoperiodic Regimes. World Appl. Sci. J., 32(7):1388-1393. https://doi.org/10.5829/idosi.wasj.2014.32.07.86202.
- Augustave, K., Lavoisier, F.T., Nathalie, M.N., Donatien A.A., Boris, T.M., Constant F.F., Fonkem, S., Atride, T.M. (2020). Effects of photoperiod on male African giant rat (Cricetomysgambianus) reproductive parameters in captivity. IOSR J. Agric. Vet. Sci. 13(9): 62-66.https://www.doi: 10.9790/2380-1309036266
- Ayo, J. O., Oladele, S. B., Ngam, S., Fayomi, A. and Afolayan, S. B. (1999). Diurnal fluctuations in rectal temperature of the sokoto goat during the harmattan season. Res. Vet Sci., 66(1): 7 9. https://doi.org/10.1053/rvsc.1998.0231
- Ayorinde KL, Ayeni JSO. (1986). The reproductive performance of indigenous and exotic varieties of the guinea fowl during different seasons in Nigeria. J. Anim. Prod. Res., 6(2):127-140
- Bonda‐Ostaszewska, E. and Wlostowski, T. (2015). Apoptosis, proliferation,and cell size in seasonal changes of body and organ weight in malebank voles Myodesglareolus. Mammal Res., 60(3): 255-261. http://dx.doi.org/10.1007/s13364-015-0224-2
- Bradshaw, W.E. and Holzapfel, C.M. (2007). Evolution of animal photoperiodism. Ann.Rev.Ecol.Evol.Syst.,38; :1 5. https://doi.org/10.1146/annurev.ecolsys.37.091305.1 10115
- Budras, K.D. and Meier, U. (1981). The epididymis and its development in ratite birds (ostrich, emu, rhea).Anat. Embryol., 162: 281 299. https://doi.org/10.1007/BF00299973
- Bull, M.L., Martins, M.R., Cesario, M.D., Podovani, C.R. and Mendes, A.A. (2007). Anatomical study on domestic fowl (Gallus domesticus): Reproductive system. Int. J. Morphol., 25(4): 709 716. http://dx.doi.org/10.4067/S0717-95022007000400007
- Calvo, A., Pastor, L.M., Martinez, E, Vanquez, J.M and Roca J (1999) Age-related changes in the hamster epididymis. Anat Record, 256:335–346 (1999)
- Chemineau, P., Malpaux, B., Brillard, J. P. and Fostier, A. (2007). Seasonality of reproduction and production in farm fishes,birds and mammals. Anim., 1:419-432. https://doi.org/ 10.1017/S1 751731107691873
- Cruceño, A.M., De Rosas, J.C., Fóscolo, M., Chaves, E.M., Scardapane, L., Dominguez, S. and Aguilera Merlo, C. (2013). Effects of photoperiod on epididymal and sperm morphology in a Wild Rodent, the Viscacha (Lagostomus maximus maximus). Int. Sch. Res. Notices, 2013. 128921. http://dx. doi.org/10.5402/2013/128921
- Dawson, A., King, V.M., Bentley, G.E. and Ball, G.F. (2001). Photoperiodic Control of Seasonality in Birds. J. Biol. Rhythms, 16(4): 365-380. https://doi.org/10.1177/074873 001129002079
- Dawson, A. (2002). Photoperiodic control of the annual cycle in birds and comparison with mammals. Ardea, 90(3): 355-367.
- Dzenda, T., Ayo, J. O., Lakpini, C. A. M. and Adelaiye, A. B. (2011). Diurnal, seasonaland sex variations in rectal temperature of African Giant rats (Cricetomys gambianus, Waterhouse- 1840). J. Therm. Biol., 36: 255 263. http://dx.doi.org/10.1016%2Fj.jther bio.2011.03.010
- El-Saba, A.A. and Abrabou, M. (2013). Histological and ultrastructural studies on the Epididymis of Pigeon (Columba livia). Sci. Nat.,2(4): 108-115.
- Freedman, M.S., Lucas, R.J., Soni, B., von Schantz, M., Muñoz, M., David-Gray, Z. and Foster, R. (1999). Regulation of mammaliancircadian behavior by non-rod, non-cone, ocularphotoreceptors, Sci., 284: 502. https://doi.org/10.1126/science.284.5413.502
- Flecknell, P.A. (1987). Laboratory animal anesthesia. Academic press L. T. D, London U.K. Pp: 32-133.
- Furuta, I., Porkka‐Heiskanen, T., Scarbrough, K., Tapanainen, J., Turek, F.W. and Hsueh, A.J. (1994). Photoperiod regulates testis cell apoptosis in Djungarian hamsters. Biol.Reprod., 51(6): 1315 1321. https://doi.org/10.1095/biolreprod51.6.1315
- Goldman, B.D. (2001). Mammalian photoperiodic system: Formal Properties and Neuroendocrine Mechanisms of Photoperiodic Time Measurement. J. Biol. Rhythms,16(4): 283 301. https://doi.org/10.1177/074873001129001980
- González-Morán, M.G. and Soria-Castro, E. (2010).Changes in the tubular compartment of the testis of Gallus domesticus during development. Br. Poult. Sci., 51(2): 296-307.
- Gwinner, E. (2003). Circannual rhythms in birds. Curr. Opin. Neurobiol., 13: 770 778. https://doi.org/10.1016/j.conb.2003.10.010
- Han, Y.Y., Zhan, J.Q., Xu, Y., Zhang, F.W., Yuan, Z.R., and Weng, Q. (2017).Proliferation and apoptosis processes in the seasonal testiculardevelopment of the wild Daurian ground squirrel (CitellusdauricusBrandt, 1844). Reprod. Fertil. Dev.,29(9):1680-1688. https://doi .org/10.1071/rd16063
- Jeon, G.H., Kim, H.J, Park, J., Lee, S.H., Cheon, Y.P., Choi, D. (2020). The Effects of Daily Melatonin Gavage on Reproductive Activity in the Male Syrian Hamsters. Dev. Reprod., 24(4):263 276. https://doi.org /10.12717/dr.2020.24.4.263
- Kenfack. A., Fonou, L.T., Fopa, C.F.,Guiekep J.N., Ngoula, F.,Vemo, B.N.,Tsambou, A.M. and Fonkem, S. (2020). Effects of photoperiod on growth performance in female African Giant Rat (Cricetomysgambianus). Int. J.Agron. Agric. Res., 17(4): 11-16.
- Khatun, P. and Das, K.S. (2019).Gross Anatomy of epididymis and ductus deferens of adult Khaki Campbell duck (Anasplatyrhynchosdomesticus) in Bangladesh. J.Biosci. Agric.Res., 22(01): 1805-1809.https://doi.org/10.18801/jbar.220119.221
- Kirby, J.D. and Froman, D.P. (2021). Reproduction in male birds. In: Scanes C, Dridi S ed. Sturkie’s Avian Physiology. 7th ed. New York:Academic Press, 597-615. ISBN: 9780128197707.
- Kojima, D. and Fukada, Y. (1999). Non visual photoreception by a variety of vertebrate opsins. Novartis Found Symp., 224: 265. https://doi.org/10.1002/9780470515693.ch15.
- Kowal, J.M. and Knabe, D.T. (1972). An Agro-Climatic Atlas of the northern states of Nigeria. Ahmadu Bello University Press, Zaria, Nigeria.
- Kyere, C.G., Okyere, K., Duodu, A., Twumasi, G., Dapaah, P.K. and Poku, P.A. Jnr. (2021). Effect of light on Guinea fowl (Numidameleagris) production. A Review. World J. Adv. Res. Rev., 9(3): 337 345. https://doi.org/10.30574/wjarr.2021.9.3.0115
- Lewis, D. P., Middleton, A. B. and Gous, M. R. (2006). Exogenous Melatonin Modifies Rate ofSexual Maturation in Domestic Pullets. Poult. Sci., 85(1):117-122. https://doi.org/ 10.1093/ps/85.1.117
- Martinez‐Hernandez, J., Seco‐Rovira, V., Beltran‐Frutos, E., Ferrer, C.,Canteras, M., Sanchez‐Huertas, M.D.M. and Pastor, L.M. (2018).Testicular histomorphometry and the proliferative and apoptotic activities of the seminiferous epithelium in Syrian hamster during spontaneous recrudescence after exposure to short photoperiod. Reprod. Domest. Anim., 53(5): 1041 1051. https://doi.org/10.1111/rda.13201
- Maruch, S.M.D.G., Riberto, M.D.G. and Teles, M.E.D.O. (1998). Morphological and histochemical aspects of the epididymal region and ductus deferens of Columbina talpacoti (Temminck) (Columbidae, Columbiformes). Rev. Bras. Zool., 15(2): 365-373. https://doi.org/10.1590/S0101-81751998000200009
- McLelland, A. (1991). A Colour Atlas of Avian Anatomy. Wolfe Publishing Ltd. Pp. 66-82.
- Mohan, J., Sharma S.K., Kolluri, G., Singh, R.P., Tyagi, J.S. and Kataria, J.M. (2016).Semencharacteristics and seasonality in different varieties of male Guinea fowl. Adv. Anim. Vet. Sci.,4(6): 320-326. http://dx.doi.org/10.14737/journal.aavs/2016/4.6.320.326
- Mou, J., Xu, J., Wang, Z., Wang, C., Yang, X., Wang, X., Xue, H., Wu, M. and Xu, L. (2020).Effects of photoperiod on morphology and function in testis and epididymis of Cricetulusbarabensis. J. Cell. Physiol., 236(3): 2109 2125. http://doi.org/10.1002/jcp.29998
- Noori, S. J. M and Mirhish, S. M. (2018). Histomorphological Study of Epididymis, ductus deferens and phallus in Adult Male Guinea Fowl (Numidameleagris). Iraqi J. Vet. Med.,42(2):58-65. https://doi.org/10.30539/iraqijvm.v42i2.298
- Ogawa, H., Kuwayama, T. and Ichinoe, K. (1993). Effect of photoperiods on testicular growth and onset of egg-laying in the guinea fowl. Japan Poult. Sci., 30: 49-54.https://doi.org/ 10.2141/ jpsa.30.49
- Okano, T. and Fukada, Y. (1997). Phototransduction cascade andcircadian oscillator in chicken pineal gland. J. Pineal Res., 22: 145. https://doi.org/10.1111/j.1600-079x.1997.tb00316.x
- Okyere, K., Kagya-Agyemang, J.K, Annor, SY, Asabere-Ameyaw, A, 2 and Kyere, CG (2020). Influence of Season and Day Length on Production and Reproductive Traits and Egg Characteristics of the Guinea Fowl (Numida meleagris). Asian J.Res.Zool 3(1): 26 34 https://doi.org/10.9734/ajriz/2020/v3i130081.
- Olayaki, L.A., Soladoye O., Salman, T.M., and Joraiah, B. (2008). Effects of Photoperiod on testicular functions in male Sprague-Dawley rats. Nig. J. Physiol. Sci., 23 (1-2): 27-30
- Pieri, N.C.G., Santos, P.R.D., Roballo, K.C.S., Flamini, M.A., Barbeito, C.G., Ambrosio, C.E. and Martins, D. D. (2014). Seasonal variations cause morphological changes and altered spermatogenesis in the testes ofviscacha (Lagostomusmaximus). Anim.Reprod. Sci., 149(3‐4): 316 324. https://doi.org/10.1016/j.anireprosci.2014.07.007
- Razi, M., Hassanzadeh, S. H., Najafi, G. R., Feyzi, S., Moshtagion, M., Janbaz, H. and Amin, M. (2010). Histological and anatomical study of the White Rooster of testis, epididymis and ductus deferens. Int. J. Vet. Res.,4(4): 229-236.
- Sharp, P. (2005). Photoperiodic regulation of seasonal breeding in birds. Ann. N. Y. Acad. Sci., 1040(1): 189-199. https://doi.org/10.1196/annals.1327.024.
- Siopes, T. D. and Wilson, W.O. (1974). Extraocular modification ofphotoreception in intact and pinealectomizedCoturnix. Poult. Sci.,53: 2035. https://doi.org/10.3382/ps.0532035
- Tamilselvan, S., Dhole, B. and Sinha, R. (2021). Age wise changes in morphology and morphometry of epididymis of Guinea fowl (Numidameleagris). J. Expl.Zool.,24: 79-82.
- Tavolaro, M., Thomson, L., Ross, A., Morgan, P. and Helfer, G. (2015). Photoperiodic effects on Seasonal Physiology, Reproductive Status and Hypothalamic Gene Expression in Young Male F344 Rats. J.Neuroendocrinol., 27:79-87. https://doi.org/10.1111%2Fjne.12241
- Thiele, H.H. (2009). Light Stimulation of Commercial Layers.Lohmann Information, 44(2):Pp. 40.
- Umosen, A.D., Onyeanusi, B.I., Salami, S.O., Nzalak, J.O., Imam, J. and Ibe, C.S. (2008).Observations on the Wattles of Adult Helmeted Guinea Fowls (Numidameleagrisgaleata). Int. J. Poult. Sci., 7(12): 1204-1206. https://dx.doi.org/10.3923/ ijps.2008.1 204.1206
- Vijayakumar, K., Balasundaram, K., Paramasivan, S., Kumaravel, A. and Madhu, N. (2014). Macroanatomy of femalereproductive tract during laying and non-laying period in adult emu birds (Dromaiusnovaehollandiae). Asian J. Sci. Technol., 5(12): 793-795.
- Yakubu, A., Jegede, P., Wheto, M., Shoyombo, A.J., Adebambo, A.O., Popoola, M.A., Osaiyuwu, O.H., Olafadehan, O.A., Alabi, O.O., Ukim, C.I. and Vincent, S. T. (2022). Multivariate characterisation of morpho biometric traits of indigenous helmeted Guinea fowl (Numida meleagris) in Nigeria. PloS one, 17(6):p.e0261048. https://doi.org/10.1371/journal.pone.0261048
- Young, K.A. and Nelson, R.J. (2001). Mediation of seasonal testicularregression by apoptosis. Reprod. 122(5): 677 685. https://doi.org/10.1530/rep.0.1220677
- Zubairu, M., Ali, M.N., Umosen, A.D., Muazu, T.A., Baso, A., Atabo, S.M. and Usman, M.D. (2021). Effects of Photoperiodism on the Histomorphometry of the Thyroid Gland of the African Giant Rat (Cricetomysgambianus). Sahel J. Vet. Sci., 18(4): 7-13. https://doi.org/10.54058/saheljvs.v18i4.287
References
Abdul-Rahman, I.I., Robinson, J.E., Obese, F.Y., Jeffcoate I.A. and Awumbila, B. (2016). Effects of season on the reproductive organ and plasma testosterone concentrations in guinea cocks (Numida meleagris). Poult. Sci., 95(3):636-644. https//doi.org/ 10.3382/ps/ pev342
Abdul-Rahman, I.I. and Jeffcoate I.A. (2018). Histological structure and age-related changes in the luminal diameter of the excurrent duct system of guinea cocks (Numidameleagris) and associated changes in testosterone concentrations. Can. J. Vet. Res., 82(1):60-65.
Aire, T.A., Ayeni, J. S. O. and Olowo-Okorun, M. O. (1979). The structure of the excurrent ducts of the testis of the guineafowl (Numida meleagris). J. Anat., 129(3): 633-643.
Assia, T. and Boulakoud, S.M. (2014). The Effect of Melatonin on Reproductive Parameters inPigeon Columba liviaExposed toDifferent Photoperiodic Regimes. World Appl. Sci. J., 32(7):1388-1393. https://doi.org/10.5829/idosi.wasj.2014.32.07.86202.
Augustave, K., Lavoisier, F.T., Nathalie, M.N., Donatien A.A., Boris, T.M., Constant F.F., Fonkem, S., Atride, T.M. (2020). Effects of photoperiod on male African giant rat (Cricetomysgambianus) reproductive parameters in captivity. IOSR J. Agric. Vet. Sci. 13(9): 62-66.https://www.doi: 10.9790/2380-1309036266
Ayo, J. O., Oladele, S. B., Ngam, S., Fayomi, A. and Afolayan, S. B. (1999). Diurnal fluctuations in rectal temperature of the sokoto goat during the harmattan season. Res. Vet Sci., 66(1): 7 9. https://doi.org/10.1053/rvsc.1998.0231
Ayorinde KL, Ayeni JSO. (1986). The reproductive performance of indigenous and exotic varieties of the guinea fowl during different seasons in Nigeria. J. Anim. Prod. Res., 6(2):127-140
Bonda‐Ostaszewska, E. and Wlostowski, T. (2015). Apoptosis, proliferation,and cell size in seasonal changes of body and organ weight in malebank voles Myodesglareolus. Mammal Res., 60(3): 255-261. http://dx.doi.org/10.1007/s13364-015-0224-2
Bradshaw, W.E. and Holzapfel, C.M. (2007). Evolution of animal photoperiodism. Ann.Rev.Ecol.Evol.Syst.,38; :1 5. https://doi.org/10.1146/annurev.ecolsys.37.091305.1 10115
Budras, K.D. and Meier, U. (1981). The epididymis and its development in ratite birds (ostrich, emu, rhea).Anat. Embryol., 162: 281 299. https://doi.org/10.1007/BF00299973
Bull, M.L., Martins, M.R., Cesario, M.D., Podovani, C.R. and Mendes, A.A. (2007). Anatomical study on domestic fowl (Gallus domesticus): Reproductive system. Int. J. Morphol., 25(4): 709 716. http://dx.doi.org/10.4067/S0717-95022007000400007
Calvo, A., Pastor, L.M., Martinez, E, Vanquez, J.M and Roca J (1999) Age-related changes in the hamster epididymis. Anat Record, 256:335–346 (1999)
Chemineau, P., Malpaux, B., Brillard, J. P. and Fostier, A. (2007). Seasonality of reproduction and production in farm fishes,birds and mammals. Anim., 1:419-432. https://doi.org/ 10.1017/S1 751731107691873
Cruceño, A.M., De Rosas, J.C., Fóscolo, M., Chaves, E.M., Scardapane, L., Dominguez, S. and Aguilera Merlo, C. (2013). Effects of photoperiod on epididymal and sperm morphology in a Wild Rodent, the Viscacha (Lagostomus maximus maximus). Int. Sch. Res. Notices, 2013. 128921. http://dx. doi.org/10.5402/2013/128921
Dawson, A., King, V.M., Bentley, G.E. and Ball, G.F. (2001). Photoperiodic Control of Seasonality in Birds. J. Biol. Rhythms, 16(4): 365-380. https://doi.org/10.1177/074873 001129002079
Dawson, A. (2002). Photoperiodic control of the annual cycle in birds and comparison with mammals. Ardea, 90(3): 355-367.
Dzenda, T., Ayo, J. O., Lakpini, C. A. M. and Adelaiye, A. B. (2011). Diurnal, seasonaland sex variations in rectal temperature of African Giant rats (Cricetomys gambianus, Waterhouse- 1840). J. Therm. Biol., 36: 255 263. http://dx.doi.org/10.1016%2Fj.jther bio.2011.03.010
El-Saba, A.A. and Abrabou, M. (2013). Histological and ultrastructural studies on the Epididymis of Pigeon (Columba livia). Sci. Nat.,2(4): 108-115.
Freedman, M.S., Lucas, R.J., Soni, B., von Schantz, M., Muñoz, M., David-Gray, Z. and Foster, R. (1999). Regulation of mammaliancircadian behavior by non-rod, non-cone, ocularphotoreceptors, Sci., 284: 502. https://doi.org/10.1126/science.284.5413.502
Flecknell, P.A. (1987). Laboratory animal anesthesia. Academic press L. T. D, London U.K. Pp: 32-133.
Furuta, I., Porkka‐Heiskanen, T., Scarbrough, K., Tapanainen, J., Turek, F.W. and Hsueh, A.J. (1994). Photoperiod regulates testis cell apoptosis in Djungarian hamsters. Biol.Reprod., 51(6): 1315 1321. https://doi.org/10.1095/biolreprod51.6.1315
Goldman, B.D. (2001). Mammalian photoperiodic system: Formal Properties and Neuroendocrine Mechanisms of Photoperiodic Time Measurement. J. Biol. Rhythms,16(4): 283 301. https://doi.org/10.1177/074873001129001980
González-Morán, M.G. and Soria-Castro, E. (2010).Changes in the tubular compartment of the testis of Gallus domesticus during development. Br. Poult. Sci., 51(2): 296-307.
Gwinner, E. (2003). Circannual rhythms in birds. Curr. Opin. Neurobiol., 13: 770 778. https://doi.org/10.1016/j.conb.2003.10.010
Han, Y.Y., Zhan, J.Q., Xu, Y., Zhang, F.W., Yuan, Z.R., and Weng, Q. (2017).Proliferation and apoptosis processes in the seasonal testiculardevelopment of the wild Daurian ground squirrel (CitellusdauricusBrandt, 1844). Reprod. Fertil. Dev.,29(9):1680-1688. https://doi .org/10.1071/rd16063
Jeon, G.H., Kim, H.J, Park, J., Lee, S.H., Cheon, Y.P., Choi, D. (2020). The Effects of Daily Melatonin Gavage on Reproductive Activity in the Male Syrian Hamsters. Dev. Reprod., 24(4):263 276. https://doi.org /10.12717/dr.2020.24.4.263
Kenfack. A., Fonou, L.T., Fopa, C.F.,Guiekep J.N., Ngoula, F.,Vemo, B.N.,Tsambou, A.M. and Fonkem, S. (2020). Effects of photoperiod on growth performance in female African Giant Rat (Cricetomysgambianus). Int. J.Agron. Agric. Res., 17(4): 11-16.
Khatun, P. and Das, K.S. (2019).Gross Anatomy of epididymis and ductus deferens of adult Khaki Campbell duck (Anasplatyrhynchosdomesticus) in Bangladesh. J.Biosci. Agric.Res., 22(01): 1805-1809.https://doi.org/10.18801/jbar.220119.221
Kirby, J.D. and Froman, D.P. (2021). Reproduction in male birds. In: Scanes C, Dridi S ed. Sturkie’s Avian Physiology. 7th ed. New York:Academic Press, 597-615. ISBN: 9780128197707.
Kojima, D. and Fukada, Y. (1999). Non visual photoreception by a variety of vertebrate opsins. Novartis Found Symp., 224: 265. https://doi.org/10.1002/9780470515693.ch15.
Kowal, J.M. and Knabe, D.T. (1972). An Agro-Climatic Atlas of the northern states of Nigeria. Ahmadu Bello University Press, Zaria, Nigeria.
Kyere, C.G., Okyere, K., Duodu, A., Twumasi, G., Dapaah, P.K. and Poku, P.A. Jnr. (2021). Effect of light on Guinea fowl (Numidameleagris) production. A Review. World J. Adv. Res. Rev., 9(3): 337 345. https://doi.org/10.30574/wjarr.2021.9.3.0115
Lewis, D. P., Middleton, A. B. and Gous, M. R. (2006). Exogenous Melatonin Modifies Rate ofSexual Maturation in Domestic Pullets. Poult. Sci., 85(1):117-122. https://doi.org/ 10.1093/ps/85.1.117
Martinez‐Hernandez, J., Seco‐Rovira, V., Beltran‐Frutos, E., Ferrer, C.,Canteras, M., Sanchez‐Huertas, M.D.M. and Pastor, L.M. (2018).Testicular histomorphometry and the proliferative and apoptotic activities of the seminiferous epithelium in Syrian hamster during spontaneous recrudescence after exposure to short photoperiod. Reprod. Domest. Anim., 53(5): 1041 1051. https://doi.org/10.1111/rda.13201
Maruch, S.M.D.G., Riberto, M.D.G. and Teles, M.E.D.O. (1998). Morphological and histochemical aspects of the epididymal region and ductus deferens of Columbina talpacoti (Temminck) (Columbidae, Columbiformes). Rev. Bras. Zool., 15(2): 365-373. https://doi.org/10.1590/S0101-81751998000200009
McLelland, A. (1991). A Colour Atlas of Avian Anatomy. Wolfe Publishing Ltd. Pp. 66-82.
Mohan, J., Sharma S.K., Kolluri, G., Singh, R.P., Tyagi, J.S. and Kataria, J.M. (2016).Semencharacteristics and seasonality in different varieties of male Guinea fowl. Adv. Anim. Vet. Sci.,4(6): 320-326. http://dx.doi.org/10.14737/journal.aavs/2016/4.6.320.326
Mou, J., Xu, J., Wang, Z., Wang, C., Yang, X., Wang, X., Xue, H., Wu, M. and Xu, L. (2020).Effects of photoperiod on morphology and function in testis and epididymis of Cricetulusbarabensis. J. Cell. Physiol., 236(3): 2109 2125. http://doi.org/10.1002/jcp.29998
Noori, S. J. M and Mirhish, S. M. (2018). Histomorphological Study of Epididymis, ductus deferens and phallus in Adult Male Guinea Fowl (Numidameleagris). Iraqi J. Vet. Med.,42(2):58-65. https://doi.org/10.30539/iraqijvm.v42i2.298
Ogawa, H., Kuwayama, T. and Ichinoe, K. (1993). Effect of photoperiods on testicular growth and onset of egg-laying in the guinea fowl. Japan Poult. Sci., 30: 49-54.https://doi.org/ 10.2141/ jpsa.30.49
Okano, T. and Fukada, Y. (1997). Phototransduction cascade andcircadian oscillator in chicken pineal gland. J. Pineal Res., 22: 145. https://doi.org/10.1111/j.1600-079x.1997.tb00316.x
Okyere, K., Kagya-Agyemang, J.K, Annor, SY, Asabere-Ameyaw, A, 2 and Kyere, CG (2020). Influence of Season and Day Length on Production and Reproductive Traits and Egg Characteristics of the Guinea Fowl (Numida meleagris). Asian J.Res.Zool 3(1): 26 34 https://doi.org/10.9734/ajriz/2020/v3i130081.
Olayaki, L.A., Soladoye O., Salman, T.M., and Joraiah, B. (2008). Effects of Photoperiod on testicular functions in male Sprague-Dawley rats. Nig. J. Physiol. Sci., 23 (1-2): 27-30
Pieri, N.C.G., Santos, P.R.D., Roballo, K.C.S., Flamini, M.A., Barbeito, C.G., Ambrosio, C.E. and Martins, D. D. (2014). Seasonal variations cause morphological changes and altered spermatogenesis in the testes ofviscacha (Lagostomusmaximus). Anim.Reprod. Sci., 149(3‐4): 316 324. https://doi.org/10.1016/j.anireprosci.2014.07.007
Razi, M., Hassanzadeh, S. H., Najafi, G. R., Feyzi, S., Moshtagion, M., Janbaz, H. and Amin, M. (2010). Histological and anatomical study of the White Rooster of testis, epididymis and ductus deferens. Int. J. Vet. Res.,4(4): 229-236.
Sharp, P. (2005). Photoperiodic regulation of seasonal breeding in birds. Ann. N. Y. Acad. Sci., 1040(1): 189-199. https://doi.org/10.1196/annals.1327.024.
Siopes, T. D. and Wilson, W.O. (1974). Extraocular modification ofphotoreception in intact and pinealectomizedCoturnix. Poult. Sci.,53: 2035. https://doi.org/10.3382/ps.0532035
Tamilselvan, S., Dhole, B. and Sinha, R. (2021). Age wise changes in morphology and morphometry of epididymis of Guinea fowl (Numidameleagris). J. Expl.Zool.,24: 79-82.
Tavolaro, M., Thomson, L., Ross, A., Morgan, P. and Helfer, G. (2015). Photoperiodic effects on Seasonal Physiology, Reproductive Status and Hypothalamic Gene Expression in Young Male F344 Rats. J.Neuroendocrinol., 27:79-87. https://doi.org/10.1111%2Fjne.12241
Thiele, H.H. (2009). Light Stimulation of Commercial Layers.Lohmann Information, 44(2):Pp. 40.
Umosen, A.D., Onyeanusi, B.I., Salami, S.O., Nzalak, J.O., Imam, J. and Ibe, C.S. (2008).Observations on the Wattles of Adult Helmeted Guinea Fowls (Numidameleagrisgaleata). Int. J. Poult. Sci., 7(12): 1204-1206. https://dx.doi.org/10.3923/ ijps.2008.1 204.1206
Vijayakumar, K., Balasundaram, K., Paramasivan, S., Kumaravel, A. and Madhu, N. (2014). Macroanatomy of femalereproductive tract during laying and non-laying period in adult emu birds (Dromaiusnovaehollandiae). Asian J. Sci. Technol., 5(12): 793-795.
Yakubu, A., Jegede, P., Wheto, M., Shoyombo, A.J., Adebambo, A.O., Popoola, M.A., Osaiyuwu, O.H., Olafadehan, O.A., Alabi, O.O., Ukim, C.I. and Vincent, S. T. (2022). Multivariate characterisation of morpho biometric traits of indigenous helmeted Guinea fowl (Numida meleagris) in Nigeria. PloS one, 17(6):p.e0261048. https://doi.org/10.1371/journal.pone.0261048
Young, K.A. and Nelson, R.J. (2001). Mediation of seasonal testicularregression by apoptosis. Reprod. 122(5): 677 685. https://doi.org/10.1530/rep.0.1220677
Zubairu, M., Ali, M.N., Umosen, A.D., Muazu, T.A., Baso, A., Atabo, S.M. and Usman, M.D. (2021). Effects of Photoperiodism on the Histomorphometry of the Thyroid Gland of the African Giant Rat (Cricetomysgambianus). Sahel J. Vet. Sci., 18(4): 7-13. https://doi.org/10.54058/saheljvs.v18i4.287