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Stages of the spermatogenic cycle in the horse were determined by trans-illumination of enzymically isolated, seminiferous tubules and were verified by whole-mounted tubules observed by Nomarski optics and by conventional histology. Isolated tubules were obtained from young (less than 2 years) and adult (4-10 years) horses by enzymic digestion. Dispersed tubules were separated into three different groups based on the presence, size, and intensity of a dark region in the centre of the tubules: (1) pale--homogeneously light, (2) spotty--light on the periphery with a wide spotty region in the central two-thirds, or (3) dark--an intensely dark, narrow region through the central one-third. Seminiferous tubules from young stallions separated easily, but were only of the homogeneously light pattern as they lacked mature spermatids. After observation by Nomarski optics and bright-field microscopy, pale tubules under transillumination largely contained Stages I and II, spotty tubules contained Stages V and VI, and dark tubules contained Stages VII and VIII of the spermatogenic cycle. In-vitro incorporation of [3H]thymidine in spermatogonia and preleptotene/leptotene primary spermatocytes of these tubules confirmed the viability of germ cells in isolated tubules, and ultrastructural analysis confirmed excellent preservation of normal structure of seminiferous epithelium in isolated tubules. Hence, segments of seminiferous tubules in specific stages of the spermatogenic cycle can be obtained from enzymically digested horse testes when viewed by transillumination.

Isolation and staging of horse seminiferous tubules by transillumination