1. Structural abnormalities of seminiferous tubule or destruction of BTB can induce HBV DNA transfection in the whole seminiferous epithelium of rat testicle, and cause higher transfection efficiency.

2. Conclusion:LBP could decrease the structural damage of seminiferous tubule caused by higher temperature culture.

3. Inadequate energy or excessive protein in the diet was shown to decrease the relative growth rate of the testis of male broilers and inhibit the development of the seminiferous tubule.

4. The testis at spermatocyte phase develops, and is translucent, and the spermatogenetic cells in seminiferous tubule are primarily composed of primary spermatocytes and secondary spermatocytes.

5. The testis at mature sperm phase get to the biggest in volume, and is purple, and the spermatogenetic cells in seminiferous tubule are almost composed of mature sperms.

6. The testis at deteriorated phase reduces in volume, and is translucent , and the mature sperms in seminiferous tubule have almost been extruded.