Investigation of excretion and absorption of different zinc salts in puppies

The effects of dietary zinc on zinc absorption and excretion were evaluated with six 12-week-old beagles. The dogs were fed a commercial dry food late r supplemented with 2 and 4 mg/kg of body weight per day of either zinc sul phate, zinc acetate or zinc oxide. The concentrations of zinc in the urine and faeces of all treatment groups were increased depending on the type of zinc salts and tile dosage in the diet (P < 0.05). The apparent absorption of zinc salts ranged from 0.20 to 0.36. The zinc salt supplements at both d osages did not affect the digestibility of crude protein, fat and fibre. Th e zinc concentration in plasma varied with the type of zinc salt and with t he dosage. The mean concentrations ranged from 61 +/- 1.46 mug to 73 +/- 1. 57 mug/dl in the unsupplemented groups, whereas it was 115 +/- 2.33 mug/dl in the group supplemented with zinc acetate at the highest dosage.