PSX-38 Late-Breaking Abstract: Sequential feeding with diets varying differ in amino acid content on nutrient balance in growing-finishing pigs

Abstract

Abstract This study evaluated the effect of conventional and sequential feeding programs with diets varying in amino acid content over the day on nutrient balance for growing-finishing pig. Sixty-eight barrows with an average initial BW of 25.0±2.04 were housed in a single pen with five automatic intelligent precision feeders (AIPF; University of Lleida, Lleida, Spain). Pigs were distributed in four feeding programs: 1) conventional feeding (CONV) in which pigs received 100% of SID AA recommendations for the entire day; 2) sequential feeding (SEQ80-120) providing 80% SID AA recommendations from 0000 to 1159h and 120% from 1200 to 2359h; 3) sequential feeding (SEQ70-130) providing 70% SID AA recommendations from 0000 to 1159h and 130% from 1200 to 2359h; and 4) sequential feeding (SEQ60-140) providing 60% SID AA recommendations from 0000 to 1159h and 140% from 1200 to 2359h. Body lean mass and mineral body content were obtained by DXA analysis and were converted to body protein and P content. Three contrasts were constructed to evaluate the effects between CONV and sequential treatments. In phase 1 (0–28d), pigs fed SEQ70-130 presented higher crude protein intake, N retention, N excretion, P intake and P retention (P < 0.05) compared to CONV fed pigs. SEQ 60–140 fed pigs presented higher P retention and P retention efficiency (P < 0.05) compared to CONV fed pigs. In phase 2 (29–54d), no statistical difference for any evaluated variable was verified (P > 0.05). In phase 3 (55–82d), SEQ70-130 fed pigs showed higher N excretion and lower N retention efficiency and lysine efficiency (P < 0.05) when compared to CONV fed pigs. In the entire experimental period (0–82d), there were no significant differences between treatments. According to our results, sequential feeding program improves nutrient balance of pigs at the beginning of the growth period.