Estudo morfológico do ciclo reprodutivo e variabilidade nos níveis de glicose, de glicogênio e de lipídeo ao longo do ano em pato doméstico (Anas platyrhynchus)

Abstract

Histologic studies on the seminiferous epithelium were performed to determine the reproductive annual cycle of domestic duck in mesothermic tropical region and to correlate it with metabolic parameters such as blood glucose, hepatic and muscular glycogen and lipids, which are basic metabolic substrates related to the reproductive process. The annual reproductive cycle of the duck could be divided in four successive phases along the year, which are named reproductive, regressive, quiescent and recrudescent phases. The reproductive phase began in winter (July) reaching its maximum peak in October. The regressive phase occurred in the end of spring and in the beginning of summer (December). The quiescent phase started in the summer between January and February. The recrudescent phase occurred in autumn and winter (June) when the spermatogenetic process resumed. Concerning the energetic metabolism only the blood glucose was related to the reproductive cycle, giving energetic support to this reproductive process