Document Type : Research Paper
Authors
1 1MSc Student, 2Associate Prof., 3Professor, Dept. of Animal Science, College of Animal Science and Fisheries, Sari University of Agricultural Sciences and Natural Resources, Sari, Iran
2 2Associate Prof., 3Professor, Dept. of Animal Science, College of Animal Science and Fisheries, Sari University of Agricultural Sciences and Natural Resources, Sari, Iran
Abstract
This study was conducted to investigate the effects of different sources of organic and inorganic selenium supplements in crossbred Zel lambs. Twenty-five male lambs aged 4-5 months and with average body weight (32 ± 1.5 kg) were assigned to 5 treatments with 5 repetitions, as a completely randomized design for 84 days. The experimental treatments were:1) basal diet without selenium supplement (control); 2) basal diet + 0.5 mg Se/kg DM as selenium glycine; 3) basal diet + 0.5 mg Se/kg DM as selenium methionine; 4) basal diet + 0.5 mg Se/kg DM as selenium cysteine, and 5) basal diet + 0.5 mg Se/kg DM as sodium selenite. TPlasma selenium concentration increased significantly in all treatments supplemented with selenium compared to that in the control group. In the treatments containing selenium methionine and selenium cysteine supplements, the concentration of triiodothyronine hormone increased significantly compared with the treatments containing inorganic selenium and the control group (P<0.05). In addition, the serum concentration of tetraiodothyronine decreased in all lambs receiving selenium supplements compared to that in the control group (P<0.05), and the tetraiodothyronine/triiodothyronine ratio was lower in the treatments containing organic selenium supplement than in the control group (P<0.05). In conclusion, the results of this research show that the addition of 0.5 mg Se/kg DM from both organic and inorganic sources meets the needs of growing lambs.
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