Wang Lize, fur animal breeding expert of Hebei Agricultural University, said: At present, the early detection of male fertility is mainly testicular palpation. The male otter testes develop rapidly from late December and reach the maximum size from the end of January to the beginning of February and begin to shrink in mid-March. There are two cases of infertility in the male testicles: one is from December until March of the following year and is called the cryptorchidism; the other is the testicular development delay, that is, the testes from January to mid-February. Smaller, and increased in late February and early March, and reached normal size. Therefore, through palpation of the testes within a certain period of time, it is possible to estimate the fertility of male leeches to a certain extent. The timing of testicular palpation is very important. In early January, the diameter of the male testes varied greatly between individuals, and it was difficult to distinguish between dysplasia and normal testes except for cryptorchidism. From the end of January to the beginning of February, 2 to 3 palpation examinations are performed with good results. At the time of palpation, the size of the testicles in the scrotum, compactness, location, and sliding properties were combined. Any testicle that does not reach the testis, with a testicular diameter of less than 0.7 cm, or a soft testicle, must be eliminated.
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