The boar's need for nutrients is mainly used to maintain metabolism and produce large quantities of high-quality semen and maintain a strong sexual desire. The boar's secondary ejaculatory capacity can often reach 200-500 ml, and the highest can reach nearly 1,000 ml, which is more than other livestock. According to the analysis of semen composition, moisture accounts for 97% and crude protein accounts for 1.2-2%. Crude fat accounts for 0.2%, and other sugars, salts, etc.
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In addition, boar ejaculation time is also longer than other livestock, an average of about 10 minutes, there are more than 15 minutes, which also requires more energy consumption. In order for a boar to have a healthy constitution, a strong sexual desire, a large amount of semen, and an increase in the breeding rate, it is necessary to obtain necessary nutrients from the feed.
Protein constitutes the main component of semen, meeting boar's demand for protein quality and quantity, it is the material basis for improving the quality of semen and ensuring that sperm has high vitality and longevity. Therefore, the boar diet should generally contain more than 14% of crude protein, and should be added to the appropriate amount of high-quality animal protein feed.
The amount and proportion of calcium and phosphorus in boar diets are appropriate or not, which also has a great influence on semen quality. In the absence of sperm, the sperm deformity rate increases and the vigor decreases. The general boar diet should contain 0.6-0.7% calcium, and the normal ratio of calcium and phosphorus should be between 1:1-1:2. Vitamins A, C, and E are also indispensable nutrients for boars. When there is a lack of vitamin A in the diet, testicular atrophy will occur and sperm will not be produced; vitamins C and E will be lacking. It can cause a decrease in semen quality, but it is often not felt to be lacking in broth-based diets. 
Boar essential nutrients