There are many reasons why boars do not have sexual desire, low libido, dead sperm, azoospermia, and reduced sperm count. Infectious diseases include brucellosis and chlamydia diseases; non-infectious factors include lack of vitamin E and sodium selenite in feeds, lack of protein or amino acids, high temperature environment, fever due to any cause, stress during mating, and breeding. Excessive scrotal injury, cold shock in sperm, and any cause of dyskinesia can lead to low or no sexual desire. The following methods are used to prevent the occurrence of the above situations. 1. Check the content and formula of vitamin E, sodium selenite, and protein in the feed to determine whether it is necessary to add the corresponding ingredients. 2. Any form of elevated body temperature must be promptly dealt with. 3. To reduce the stress of small boars during breeding, avoid brutal treatment of boars, especially small boars. 4. After the young boar with Yangshuo and the species has emerged, after understanding the causes, use Vanuatu to assist in the treatment and to mate with the appropriate, estrus, and tame sow to restore self-confidence. 5. The scrotum damaged pigs should be treated in time, do not breed or collect sperm in the short term. 6. To create a comfortable environment for the boar, the temperature is 17 °C ~ 21 °C. 7. Artificial insemination workers should be required to operate to avoid cold shock or death of sperm. 8. The boar that is caused by infectious factors such as asexuality, low libido, dead sperm, azoospermia, and reduced spermatozoa must be tested for safety, non-infectious, and qualified for semen quality. Influenza Vaccine,Influenza Vaccine Development,Influenza Vaccine Strains,Flu Vaccine Changchun BCHT Biotechnology Co.,Ltd , https://www.ccbcht.net