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An experiment was conducted to determine the effects of added Zn level on growth performance and hemoglobin of nursery pigs. A total of 673 pigs (initial BW = 6.0 kg) were used in a 45-d trial. There were 3 treatments based on added Zn level: 100, 2,000, or 3,000 mg/kg from Zn oxide. Experimental diets were fed for 21 d. After that, pigs were fed a common corn and soybean meal-based diet with 100 mg/kg added Zn for 24 d. There were 8 replicates per treatment. Pigs were weighed approximately every 10 d to evaluate growth performance, and blood samples were collected for hemoglobin analysis. Data was analyzed with SAS MIXED procedure. From d 0 to 10, there was a linear improvement (P &amp;lt; 0.05) in ADG, ADFI, and G:F with increasing Zn level. From d 10 to 21, increasing Zn level resulted in higher ADFI (linear, P = 0.009). However, there was no difference (P &amp;gt; 0.10) in ADG and G:F. From d 0 to 21, pigs fed increasing added Zn had improved (linear, P &amp;lt; 0.05) ADG and ADFI. From d 21 to 45, pigs previously fed high levels of added Zn had higher ADFI (linear, P = 0.023), but there was no evidence for differences (P &amp;gt; 0.10) for ADG and G:F. Overall (d 0 to 45), pigs fed increasing added Zn levels had improved (linear, P &amp;lt; 0.05) ADG, ADFI, and final BW. A quadratic response (P &amp;lt; 0.05) was observed for hemoglobin on d 10 and 45, with no differences (P &amp;gt; 0.10) observed on d 21. In summary, pigs fed high levels of added Zn presented improved growth performance. Although the response was linear in nature, the differences between pigs fed 2,000 or 3,000 mg/kg Zn were minimal for the response variables evaluated.

PSIV18 Effects of Added Zn Level on Growth Performance and Hemoglobin of Nursery Pigs