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The effects of feeding 15 or 30 ppm of narasin on the growth performance of pigs during the grower period
The purpose of this study was to determine the effects of 15 or 30 ppm of narasin (NAR; Skycis®, Elanco Animal Health, Greenfield, IN) on the growth performance of pigs from 26.7 to 70.5 kg. On day -7, one hundred eight pens each containing 20 to 21 pigs with a BW of 26.7 kg were blocked and balanced for weight within block and then treatments: Control (CON), NAR 15 ppm, or NAR 30 ppm were randomly assigned to pens within each block. Diet treatments consisted of three identical mash diets containing corn, soybean meal, and DDGS with the appropriate amount of NAR premix added to each. Pigs were weighed on d 0, 15, 29, 43, and 50 to determine initial weight, phase weights, and ADG. Feed issuance and volumetric feeder measures were recorded in order to determine ADFI and G:F. ADG of pigs fed NAR 30 or 15 was greater (P<0.05) than that of CON on d 0 to 15 (0.81 or 0.79 kg vs 0.73 kg), 16 to 29 (0.95 or 0.95 kg vs 0.90 kg), 30 to 43 (0.98 or 0.98 kg vs 0.94 kg), and 0 to 50. ADFI of pigs fed NAR 30 or 15 was greater (P<0.05) than that of CON on d 0 to 15 (1.43 or 1.43 kg vs 1.35 kg, 16 to 29 (1.91 or 1.94 vs 1.81 kg), 30 to 43 (2.20 or 2.20 vs 2.12 kg), and 0 to 50. G:F of pigs fed NAR 30 was greater (P<0.05) than CON on d 0 to 15 (0.56 vs 0.54) and d 0 to 50. In conclusion, growing pigs fed NAR 15 or 30 for 50 d have a greater ADG and ADFI than pigs fed CON, but only pigs fed NAR 30 have a greater overall G:F than those pigs fed CON.
Item |
CON |
NAR 15 |
NAR 30 |
SE |
P |
ADG, d 0 to 50 |
0.86a |
0.90b |
0.91b |
0.005 |
<0.01 |
ADFI, d 0 to 50 |
1.84a |
1.92b |
1.91b |
0.014 |
<0.01 |
G:F, d 0 to 50 |
0.47a |
0.47ab |
0.48b |
0.002 |
<0.05 |
a,bMeans without common superscripts differ at P<0.05.
Keywords: Narasin, Pig, Growing