Hence all nutrients were kept at the same<br>levels expect for the zinc content. Approximately 200 g<br>of each diet was chosen and stored at –20◦C for analysis of the zinc content according to the method of<br>atomic absorption spectrometry using an atom absorption spectrophotometer. The analyzed zinc contents in<br>the 6 experimental diets were 87.98 (control), 29.35,<br>48.87, 69.96, 88.83, and 108.12 mg/kg. The experiment<br>lasted 11 wk included a 1-wk acclimation period and a<br>10-wk experimental period.
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