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Evaluation of different zinc sources and levels on nursery pig performance
Zinco+ (Jefo, Quebec, Canada) is an encapsulated ZnO that when added to diets at 500 ppm is suggested to elicit performance advantages similar to 3,000 ppm Zn from ZnO. To test this hypothesis, 294 pigs (PIC 327 × 1050, initially 6.4 kg BW) were used in a 31-d trial to evaluate the effects of different Zn sources on nursery pig performance. Pigs were weaned at 21 d of age and fed pelleted diets for 7 d and a mash diet for the remainder of the 31-d trial. Each treatment had 7 replicate pens with 7 pigs per pen. All diets contained 110 ppm Zn from ZnSO4 from the trace mineral premix. The 6 experimental diets included: a control diet or the control with 390 or 1,390 ppm added Zn from Zinco+; or 390, 1,390, or 2,890 ppm added Zn from ZnO. From d 7 to 21, adding dietary Zn from Zinco+ tended to increase (linear; P=0.06) ADG and improved (linear; P<0.01) G:F. Increasing Zn from ZnO increased (linear; P<0.01) ADG and ADFI and improved (quadratic; P=0.02) G:F. Pigs had greater (P<0.01) ADG and ADFI when 2,890 ppm Zn from ZnO was fed compared with pigs fed 390 ppm Zn from Zinco+. Day 21 BW increased linearly with increasing Zn from Zinco+ (P<0.03) and Zn from ZnO (P < 0.001), with pigs fed 2,890 ppm Zn from ZnO having heavier (P<0.01) BW compared with those fed 390 ppm of Zn from Zinco+. Overall (d 0 to 31), increasing Zn from Zinco+ did not affect growth performance, but increasing Zn from ZnO increased (P<0.01) ADG and ADFI. Pigs fed 390 ppm of Zn from Zinco+ had poorer ADG (P<0.02) and ADFI (P<0.01) than pigs fed 2,890 ppm of Zn from ZnO. This study shows the growth promoting benefits of adding high levels of Zn from ZnO in diets fed to newly weaned pigs. Lower levels of Zn from Zinco+ did not elicit the same growth-promoting response as 2,890 ppm of Zn from ZnO.
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|
Total Added Zn, ppm |
|
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Control |
Zinco + |
ZnO |
|
||||
Item |
110 |
500 |
1,500 |
500 |
1,500 |
3,000 |
SEM |
d 7 to 21 |
|
|
|
|
|
|
|
ADG, g |
261 |
274 |
302 |
271 |
315 |
346 |
21.2 |
G/F |
0.615 |
0.658 |
0.682 |
0.656 |
0.700 |
0.694 |
0.02 |
d 0 to 31 |
|
|
|
|
|
|
|
ADG, g |
303 |
311 |
319 |
318 |
332 |
347 |
10.5 |
G/F |
0.617 |
0.636 |
0.634 |
0.643 |
0.644 |
0.642 |
0.01 |
Keywords: growth performance, nursery pig, Zinc