Table 1. Changes in growth performance and lean (%) of growing-finishing pigs between 1980s and 2020s

Item	1980s1)	2020s2)	% Change3)
Growth performance4)
Average daily gain (kg/d)	0.79	0.825)	4.0
Average daily feed intake (kg/d)	2.71	2.156)	−20.6
Gain to feed ratio	0.29	0.38	30.9
Duration (d)	99.3	117.3	18.1
Market weight (kg)	100.0	127.3	27.3
Lean (%, at market weight)	58.1	56.5	−2.7

Data were based on 3 references [46–48].
Data were based on 2 references [49,50].
The percentage changes were determined in the 2020s relative to the 1980s.
Averaged initial and final body weight ranged from 22 to 100 kg in 1980s and 27.6 to 127 kg in 2020s, respectively.
The ADG in 2020s was adjusted to compare the ADG in 1980s using the coefficient 0.9624 data adapted from Duarte et al. [51].
The ADFI in 2020s was adjusted to compare the ADG in 1980s using the coefficient 0.9373 data adapted from Duarte et al. [51].