Magnesium increase semen quality. For covering the requirements, 40-55 ppm in the feed are recommendable. Copper takes part actively in boar reproduction because it is a component of several enzymes. Levels of 8-13 ppm are appropriate.
Vitamins and in specially, Biotin, A, D3 and C have a great importance. Biotin works like a cofactor in several processes and prevents lesions in the hooves. Levels of 200-300 mg/kg. in the feed are recommendable. Vitamin E acts like an antioxidant helping the sperm plasma membrane integrity. Levels of 200 mg/kg. are recommendable.
Although pigs have capacity of synthesis, vitamin C, increases the testosterone synthesis, vitamin E regeneration, carnitine synthesis and bone and cartilage formations. It is necessary levels of 300-500 mg/kg in the feed. The vitamin D acts in the stance quality working on the bone ossification. The minimum recommendable is 200 IU. Quantities higher than 2000 IU are forbidden.
Vitamin A works in the epithelial tissue formation and maintenance and increase of the libido. It is necessary a level of 5500 IU per kg of feed.
Choline acts in skeletal muscle development. Levels of 1,5 mg/kg are recommended. For niacin 30 mg/kg, riboflavin 13 mg/kg, acid pantothenic 20 mg/kg and acid folic 1,2 mg/kg are recommendable levels.
Polyunsaturated fat acid like linolenic acid, linoleic acid and arachidonic acid are very important in the reproduction, acting in the prostaglandin formation and take part in the membrane structure of spermatozoon.
The fibre, in levels of 6-7 % of low lignins fibre like alfalfa, bran, etc; works avoiding weight excess, enhance the intestinal transit, avoiding constipation and increases the satiety sensation of boars.
Due to the great impact that the boar represents in the farm, it is necessary to supplement the base diet, if it is not formulated specifically for the boar, with a nutritional complex in order to produce excellent sperm quality, good libido and a correct physical condition and stances.