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Efficacy of a NSP enzyme blend Easyzyme to improve pig performance depends on dietary ME concentration
To determine whether the efficacy of EasyzymeTM(EZ) on improving pig performance depends on dietary ME concentration, a completely randomized block design experiment was conducted with 6 treatments in a 2 (EZ 0 vs. 0.05%) × 3 (added fat 0, 2, or 4%) factorial arrangement. Each treatment had 8 block-replicates (2 BW × 2 rooms × 2 sexes) of 2 pigs/pen. All diets included corn, soybean meal, and 30% dry distiller's grains with solubles (3.9% fat; DDGS), and met or exceeded the requirements calculated with Swine NRC model (2012). Feeding program had 4 phases of 14, 14, 21, and 21 d each, respectively. Across phases, calculated ME in diets with 0, 2, or 4% fat was about 3,256, 3,354, and 3,452 kcal/kg, respectively. Standardized ileal digestible Lys was 0.93, 0.84, 0.78 and 0.96% in phases 1 through 4, respectively. Other amino acids were provided as a ratio to Lys. Phase 4 included ractopamine (0.05% Paylean). Data were analyzed using MIXED procedure of SAS. Block was used as a random effect in the model. Linear and quadratic polynomial analyses were conducted to assess added fat dose effect by EZ interaction, as well as across and within EZ treatments. ADG at d 28 increased 3.7% by EZ (P=0.06), and by fat addition in a linear fashion (P<0.05). No differences were detected on final BW (121.5±2.0 kg). The G:F improved (P<0.05) as more fat was added in the absence, but not in the presence of EZ (Table). Within pigs fed 0% fat diets, G:F was greater (P<0.05) in those fed EZ. In conclusion, the efficacy of EZ to improve pig performance depends on dietary ME concentration.
Dietary effect of Easyzyme (EZ) and added fat on pig performance*:
|
EZ 0% |
EZ 0.05% |
|
||||
Item |
0% fat |
2% fat |
4% fat |
0% fat |
2% fat |
4% fat |
SEM |
ADG 0-28 d, g/da |
944 |
956 |
999 |
962 |
1,002 |
1,043 |
35 |
G:F 0-28, g/kgb |
391 |
427 |
453 |
418 |
441 |
436 |
9 |
ADG 0-49 d, g/d |
935 |
947 |
980 |
969 |
981 |
981 |
26 |
G:F 0-49, g/kgb |
363 |
396 |
417 |
386 |
400 |
399 |
9 |
ADG 0-70 d, g/d |
978 |
1,008 |
1,034 |
1,028 |
1,017 |
1,017 |
23 |
G:F 0-70, g/kgb |
372 |
407 |
428 |
399 |
399 |
398 |
9 |
* Initial BW was 50.4±0.9 kg.
aMain effects EZ (P=0.06) and Fat (linear, P=0.02).
bInteraction EZ×Fat linear, P<0.05.
Keywords: Pigs, DDGS, Enzyme