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Effects of Increasing Zinc from Zn Hydroxychloride on Growth Performance, Carcass Characteristics, and Economic Return of Pigs Housed in a Commercial Environment
Effects of Increasing Zinc from Zn Hydroxychloride on Growth Performance, Carcass Characteristics, and Economic Return of Pigs Housed in a Commercial Environment
Tuesday, March 13, 2018: 9:20 AM
213 (CenturyLink Convention Center)
A total of 2,430 pigs (PIC 337×1050; initial BW=30.1 kg) were used in a 113-d growth trial to determine the effects of increasing Zn on growth performance and carcass characteristics of grow-finish pigs housed under commercial conditions. Two identical barns were used for a total of 18 pens per treatment with 27 pigs per pen. Pigs were placed in mixed gender pens and blocked by BW within barn in a randomized complete block design. The 5 dietary treatments consisted of 50, 87.5, 125, 162.5, and 200 ppm added Zn from Zn hydroxychloride (IntelliBond Z, Micronutrients, Indianapolis, IN). Corn-soy-dried distillers grains with solubles-based experimental diets were fed in 5 phases and contained a trace mineral premix without added Zn. Data were analyzed using PROC GLIMMIX of SAS with pen as the experimental unit and barn and block nested within barn as random effects. There was no evidence for Zn effects on overall ADG (P>0.10). Increasing Zn resulted in marginally significant quadratic responses in ADFI (P=0.073) and G:F (P=0.059), with the lowest ADFI and best G:F observed when 87.5 and 125 ppm of Zn was fed, respectively. There was no evidence for differences in carcass characteristics (P>0.10). Regarding economic variables, there was a marginally significant quadratic response in feed cost per pig (P=0.075) and feed cost per kg of gain (P=0.088). The lowest feed cost per pig and feed cost per kg of gain was observed when 87.5 and 125 ppm of added Zn was fed, respectively. In summary, there was no evidence for improvements in ADG when feeding beyond 50 ppm added Zn. However, feeding 125 ppm added Zn resulted in the best G:F and lowest feed cost per kg of gain.
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Added Zn, ppm |
|
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|
50 |
87.5 |
125 |
162.5 |
200 |
SEM |
BW d 0 |
30.1 |
30.1 |
30.1 |
30.1 |
30.1 |
0.704 |
BW d 113 |
132.2 |
129.7 |
130.7 |
131.7 |
130.9 |
2.499 |
ADG, kg |
0.94 |
0.92 |
0.93 |
0.93 |
0.93 |
0.021 |
ADFI, kg1 |
2.58 |
2.50 |
2.52 |
2.53 |
2.53 |
0.032 |
G:F1 |
0.364 |
0.366 |
0.371 |
0.369 |
0.367 |
0.005 |
Feed cost per pig, $1 |
67.65 |
65.77 |
66.33 |
66.77 |
66.89 |
1.413 |
Feed cost/kg gain, $1 |
0.637 |
0.636 |
0.629 |
0.633 |
0.637 |
0.006 |
1 Quadratic, P < 0.10 |
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