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Ducks occur in all continents of the world except Antarctica (24). Duck populations have been depleted due to habitat loss and pollution (17). Presently duck conservation is a priority for governments and private agencies. Although ducks are known worldwide, their economic importance and contribution to food security varies between countries. It has been reported that meats and eggs of duck have a high nutritional value, as they contain an optimal composition of essential amino acids and a high percentage of polyunsaturated fatty acids with a favorable ratio of omega-6 to omega-3 fatty acids (8). Despite the superior quality of duck eggs and meat, interest in duck production in Nigeria is negligible. Most probably, the reduced interest in duck production forced researchers to shift their attention to studies involving other avian species. To stimulate interest in duck production, extensive knowledge of the duck’s reproductive potential is required. It is therefore essential to search for baseline information on the anatomy and physiology of the reproductive organs of ducks. In temperate regions, the duck has been described as a seasonal breeder, breeding only during the spring (8). In evaluating the spermatogenic efficiency of males reared under varying environmental conditions, it is essential to determine their sperm production potential (19). The environment, encompassing climatic, nutritional, and biotic factors, plays a major role in synchronizing reproductive rhythms (27). Quantitative histology has been used in determining daily sperm production in boars (10), rabbits (3), rats (13), goats (6), and domestic fowl (19). Information on possible seasonal variation in the breeding potential of ducks in the tropical environment is lacking. The present study is aimed at investigating the effects of different seasons on the reproductive potential of drakes with the use of both descriptive and quantitative histology in the Nigerian tropical environment. Information from such a study may be helpful in the proper and profitable management of duck production. Effect of season on structural composition of drake testes and daily spermatozoa production as determined by quantitative testicular histology