Male dog infertility

Male dog infertility means that male dogs cannot be fertilized or their sperm cannot fertilize eggs: there are many kinds of infertility, including primary infertility, low energy and acquired infertility.

In primary infertility, the most common is testicular hypoplasia, small size, hard or soft texture. Most sick dogs have normal libido, but have no sperm. In two sick animals with segmental epididymal dysplasia, the ejaculatory reflex is normal, but the ejaculated semen has no sperm. Low energy usually refers to a decrease in the number of sperm, a normal sperm count but extremely poor motility, or a large abnormal sperm count. Sperm with low receptivity and high energy either have near-central droplets, head separation, or tail or acrosome deformities. A ratio of more than 20% of any deformity will lead to a decrease in energy. The causes of acquired infertility are more complex, such as:

⑴ high temperature stress: when the temperature of the testis rises to the same as the body temperature, the sperm will lose its motility, and if it lasts a little longer, the testis will lose its spermatogenic ability.

⑵ local anemia: when testicular torsion occurs, the blood supply of testicular nine will be greatly reduced, so that it has serious anemia, thus affecting the spermatogenic ability of the testis. In addition, reduced testicular arterial flow, even for a short time, can damage more than half of the cells that produce testosterone.

⑶ autoimmunity: when the testis is damaged, the sperm overflows, causing the autoimmune system to produce antibodies, which sensitize white blood cells and cause local immune response. The combination of antigens and antibodies greatly reduces the ability of fertilization.

⑷ chemical poisoning: such as zinc can cause severe necrosis of Leydig cells and seminiferous tubules: drugs such as α-chloroglycerin and alkyl compounds (phenylbutyrate nitrogen mustard, amine phosphate) can cause pathological changes in testis and epididymis: amphotericin B, estrogen, anti-estrogen can cause testicular atrophy; anti-tumor mitotic agents such as phosphophthalamine and vinblastine can inhibit testicular cell division.

⑸ hormone imbalance: when hyperthyroidism, testicular spermatogenic ability decreases; changes in the content of adrenosteroid hormone can affect the function of pituitary and testis: hypothalamus or pituitary tumor occurs. Gonadotropin production and release is reduced, which can cause testicular degeneration and atrophy.

⑹ scrotal dermatitis: canine scrotal skin is very sensitive and can easily cause inflammation when stimulated by trauma or chemicals. Scrotal dermatitis can lead to sperm abnormalities, such as poor motility and an increase in the number of curly-tailed and ringhead malformed sperm.

Excessive sexual intercourse in ⑺ can reduce receptive energy.

The change of ⑻ environment can have a reversible adverse effect on the fertility of male dogs.

⑼ tumor, spermatoma, testicular cell and Leydig cell tumor can all decrease the spermatogenic ability of testis.

⑽ testicular duct obstruction: orchitis and epididymitis occur frequently.

⑾ age: aging and infertility. The diagnosis of infertility includes history investigation, general examination, semen quality examination, testicular biopsy, hormone examination, sexual behavior observation and so on. Treatment of infertility: if there are reproductive organ diseases or systemic diseases, corresponding treatment should be given to the primary disease; congenital infertility and aging infertility generally have no therapeutic value and are generally eliminated except for precious varieties; infertility caused by feeding management can improve feeding management, strengthen exercise, and provide nutritious and balanced food. For infertility caused by poor semen quality and impotence, in addition to strengthening feeding management and taking corresponding measures according to the etiology, testosterone, pregnant horse serum gonadotropin or human chorionic gonadotropin can also be used to treat infertility.