Recent trials in the United States have shown that increasing vitamin B supplementation in the diets of weanling pigs and growing pigs leads to higher lean growth rates. The data shows that in order to obtain the best protein deposition, the pig of this genotype must be added 3 times the normal standard amount of vitamin B. The high dose of vitamin B is mainly added to compensate for the growth loss caused by the pig. Current vitamin additions are mainly based on experimental studies 20 to 40 years ago, but compared with 20 years ago due to the appearance of lean, fast-growing pigs, and adoption of new technologies such as early Segregated Weaning Technology (SEW) allows up to 80% of the capacity to deposit protein, and those pigs with low immune status can deposit 200 g of protein per day, which is twice the amount of conventional feeder-type deposition. If it is assumed that every unit of protein deposition requires the participation of vitamins, then the vitamin B needed for high lean pigs may be 4-8 times that of the current NRC standard. In 1996, American scholars Stahly and Cook studied the immune status. The effect of vitamin B requirement was stimulated by medium- and high-level antigens from the rearing animals. Pigs weighing 10-28 kg were fed freely, and niacin, pantothenic acid, and riboflavin were added to each group of diets. For B12 and folic acid, the bioavailability of vitamins provided by the diet is equivalent to 70%, 170%, 270%, 370, and 470% of the NRC (1998) requirements for the 5 to 10 kg phase. Whether in the medium-level antigen stimulation state or in the high-level antigen stimulation state, the addition of vitamin B in excess of the NRC standard can increase body weight gain by 21% and 19%, respectively, and the feed required per unit weight gain is Decreases of 10% and 6%, according to these data, in the 10 to 28kg stage, the amount of vitamin B added to the NRC standard of 370% can have the best growth efficiency and feed conversion rate. The US feed industry is tending to use 3 times the amount of NRC standard vitamin B. The authors' experimental results show that adding 16 times the NRC standard vitamin dosage will obtain the best growth performance, carcass quality and economic benefits.
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