Fig. 1
From: Impacts of weaning age on dietary needs of whey permeate for pigs at 7 to 11 kg body weight
Feed efficiency (G:F) of pigs weaned at different ages (21 and 25 d of age) with increasing average daily whey permeate intake (DWI) from 7 to 11 kg BW. Daily whey permeate intake (g/d) was calculated based on supplemental levels of whey permeate and average daily feed intake. Pigs weaned at 21 and 25 d of age fed a common diet until pigs reach 7 kg BW for 11 and 2 d, respectively. The changes in feed efficiency were: [G:F]21d = 0.487 + 0.065 log (DWI) (P < 0.05; R2 = 0.24; dotted line) and [G:F]25d = 0.667 + 0.042 log (DWI) (P = 0.061; R2 = 0.15; solid line). Therefore, [G:F]overall = 0.580 + 0.042 log (DWI21d) + 0.064 log (DWI25d) (P < 0.05; R2 = 0.52). The slope-ratio between different weaning ages was different, indicating that the feed efficiency of pigs weaned at 25 d of age responded greater (P < 0.05) than growth of pigs weaned at 21 d of age as increasing whey permeate intake