To maintain a good reserve boar, mainly do the following: (1) Feeding of reserve boars should not only allow them to grow normally, but also maintain appropriate body conditions. Excessively high or too low nutrient levels can result in overweight or overweight of the reserve boar, which can adversely affect the species value of the reserve boar. (2) Adopting the method of “open front and rear limit†is to divide the reserve boar into two stages before and after using 60 kg body weight. In the early period (before 60 kg of body weight), the mixed feed per kilogram contained 13.37 to 13.79 MJ of digestive energy, about 17% of crude protein, and the daily feed volume gradually increased to 1.7 to 1.8 kg. In the later period (60-90 kg body weight), the mixed feed per kilogram contains 12.96-13.37 MJ of digestive energy, about 16% of crude protein, and the daily feed of boars gradually increases to 2.2 kg. Ingredients should pay particular attention to the addition of lysine and other essential amino acids, vitamins, calcium and phosphorus balance. (3) Reserve boars are fed twice a day, dry powder or wet mix feed, free intake in the early period, quantitative feeding in the later period, free drinking water. (4) The reserve boar should perform appropriate exercise every day to promote blood circulation, increase the firmness of muscles and limbs, and prevent obesity. (5) Reserve boars should be raised on a single lap, and the pens should be kept dry and sanitary. (6) Adjustment: The reserve boar generally starts to adjust at 6 months of age. When adjusting and mating, the estrus stable sow should be selected. The sows and the adjusted boar can not be too far apart. One month before mating, sperm collection and breeding training is conducted to check the quality of semen and prepare for formal breeding. When the reserve boar first climbs, it is necessary to assist the boar to insert the penis into the sow's vagina and complete the ejaculation.
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