The ejaculation volume of boars is usually 200 ~ 500ml, and the semen contains about 4.6% dry
The ejaculation volume of boars is usually 200 ~ 500ml, and the semen contains about 4.6% dry matter, and more than 80% dry matter is composed of protein. The higher the sperm motility and density, the higher the pregnancy rate.
Therefore, protein, vitamin A, calcium and phosphorus are the most important nutrients for boars. The crude protein level in the diet should not be lower than 16% in the breeding period and 14% in the non-breeding period, and the essential amino acids contained in protein should be balanced.
Advocate the popularization and application of complete compound feed. In rural areas, we should make full use of leguminous green feed, leguminous seed feed and high-quality silage, and properly mix with 5% ~ 10% animal protein feed, which has a good effect on improving semen quality. Calcium, phosphorus and vitamin A are the main components of sperm. The dietary calcium content is 0.6% ~ 0.7%, phosphorus 0.5% ~ 0.6%, and carotene 7~8 mg. So as to maintain high vitality and density of sperm. The diet of boars contains not less than 3 000 kilocalories (12 540 kilojoules) per kilogram.
The diet of boars should be mainly protein-rich feed to ensure the balance of various nutrients in the diet. The volume should not be too large, otherwise it will easily cause the abdominal circumference to increase and the abdomen to sag, which will affect the breeding ability. It should also be noted that we can't completely feed the boar with carbohydrate feed, which will make the boar obese, reduce its physique, affect its reproductive function, and even lose its reproductive ability in severe cases. Feeding quantity: 3.0 kg per day in breeding period and 2.5 kg per day in non-breeding period. In the cold winter, in order to maintain the body heat consumption, the feeding amount should be appropriately increased.
Although boars are fed standard feed at different stages, they will also be overweight and thin. Therefore, feed must be increased or decreased at any time according to different situations.