How is the straight-line fattening method for fattening pigs carried out?

Straight-line fattening, also called the continuous fattening method, means that according to the growth and development characteristics of pigs, from weaning to the end of fattening, a relatively high nutritional level is always adopted according to the characteristics of nutritional needs at different stages of pig growth and development; the concentrate mix increases with the pig's age in days and body weight, that is, from 20 to 100 kg, abundant nutrition is given throughout, feed is not reduced in the middle period, so that the pigs grow fully and a higher daily weight gain is obtained, with the requirement that body weight reach 90 to 100 kg at 4 months of age.