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Effects of aggressive feed-grade amino acid supplementation in reduced CP diets formulated on ME or NE basis on growth performance of nursery pigs
Effects of aggressive feed-grade amino acid supplementation in reduced CP diets formulated on ME or NE basis on growth performance of nursery pigs
Tuesday, March 15, 2016
Grand Ballroom - Foyer (Community Choice Credit Union Convention Center)
Abstract Text: Barrows and gilts (PIC 29 × 380, n = 147) were blocked by initial BW (6.42 ± 1.21 kg) at weaning (21 ± 3 d) and allotted to pens (7 pigs/pen) within each of 7 blocks to evaluate the effects of aggressive feed-grade AA supplementation with reduced CP (RCP) diets formulated on either a ME or NE basis on growth performance of nursery pigs. Pens within blocks were randomly assigned to 1 of 3 treatments: 1) corn-SBM-corn DDGS-based diets formulated to meet the Trp requirement without addition of feed-grade Trp (feed-grade Trp was added in phase 3 to increase the Trp:Lys ratio from 17 to 19; Ctrl); 2) RCP diets formulated to meet the His:Lys ratio requirement (His:Lys = 32) without added feed-grade His and formulated on a ME basis (RCP-ME); or 3) RCP diets to meet the His:Lys requirement without feed-grade His and formulated on a NE basis (RCP-NE). Feed-grade AA were added to diets to meet all SID AA:Lys ratio requirements (M+C:Lys, 58; Thr:Lys, 60; Trp:Lys, 17 in phase 1 & 2 and 19 in phase 3; Ile:Lys, 55; Val:Lys, 65 in phase 1 & 2 and 70 in phase 3; His:Lys, 32) during each phase. During phases 1 and 2, feed-grade AA in RCP diets completely replaced poultry byproduct and partially replaced SBM in Ctrl diets. In phase 3, feed-grade AAs were included at the expense of SBM. Poultry fat was reduced in NE compared to ME-based diets. Neither ADG, ADFI, G:F, nor BW at the end of phases 1 and 2, as well as the end of the study, were affected (P ≥ 0.40) by high inclusion levels of feed-grade AA in either ME- or NE-formulated diets. These results indicate that similar performance can be achieved with either ME- or NE-based nursery diets formulated to meet the His:Lys ratio without adding feed-grade His when supplemented with high levels of essential feed-grade amino acids to meet the AA:Lys ratios.
Keywords: Reduced crude protein, Feed-grade amino acids, Nursery pigs
Item |
Treatments |
SEM |
P-value |
||
Ctrl |
RCP-ME |
RCP-NE |
|||
Overall ADG, kg |
0.46 |
0.44 |
0.47 |
0.02 |
0.403 |
Overall ADFI, kg |
0.73 |
0.70 |
0.72 |
0.03 |
0.651 |
Overall Gain:Feed |
0.64 |
0.64 |
0.65 |
0.02 |
0.765 |
Final BW, kg |
24.4 |
23.8 |
24.7 |
1.0 |
0.404 |