Semen quality checks should be performed indoors at 18-20 degrees. A glass rod or pipette is inserted into the vagina of the newly hatched female fox to extract or draw a drop of the contents 10-12 cm above the glass slide, and is observed with a 200-600 magnification microscope. The microscopic examination first determines the presence or absence of sperm, and then observes sperm morphology, vigor, and density. The number of spermatozoa is relatively high, and the activity is lively and straight forward. It is shaped like a beak and can be divided into heads and tails. The size is uniform and there is no deformity (shortheads, double heads, missing tails, two tails, volume tails, etc.). If microscopic examination shows that there is no sperm, or there are few sperm, and the vigor is not strong, the male fox should be replaced. After several inspections, male foxes without sperm or semen quality should stop breeding.
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