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Thirty 3-month-old G-K rats were treated with drinking water containing: (i) no additives; (ii) 10 mg·L−1 zinc only; or (iii) 1.0-mg CHP plus 10 mg zinc·L−1 for 4 weeks. Only the rats on zinc + CHP showed a reduced weight gain. ***P < 0.001 compared with controls.
