Full text
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| Author(s): |
Arlindo Saran Netto
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Conjunto das Químicas (IQ e FCF) (CQ/DBDCQ) |
| Defense date: | 2003-01-17 |
| Examining board members: |
Marcus Antonio Zanetti;
Celia Colli;
Raul Franzolin Neto
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| Advisor: | Marcus Antonio Zanetti |
| Abstract | |
The experiment was conducted at the Faculty of Zootechny and Food Engeneering, Campus of Pirassununga. Thirty two not castrated lambs, three months of age, average initial weight of 23 kg were housed in indvidual metabolic plastic cages. After 14 days of adaptation period they were allocated to one of the treatments during 90 days. Control: O.2ppm Se; 8 ppm Cu; 0.25 % S, Treatment 1: 5 ppm Se; 8 ppm Cu; 0.25% S, Treatment 2: 0.2 ppm Se; 8 ppm Cu; 0.37 % S Treatment 3: 5 ppm Se; 8 ppm Cu; 0.37 % S Treatment 4: 0.2 ppm Se; 25 ppm Cu; 0.25 % S, Treatment 5: 0.2 ppm Se; 25 ppm Cu; 0.25 % S, Treatment 6: 5 ppm Se; 25 ppm Cu; 0.25 % S, Treatment 7: 5 ppm Se; 25 ppm Cu; 0.37% S. The experimental design was in randomized block by weight and it was studied the interaction among selenium, copper and sulfur, through analysis on the serum, feces, urine and liver, hematocrit and weight gain. It was verified a triple interaction, high concentrations of sulfur and copper on the diets of lambs receiving 5 ppm Se, reduced concentration of selenium on the serum and Iiver, increased the selenium excretion through feces and elimination through urine. Selenium and supplemental sulfur reduced the amount of copper absorbed and copper concentration in the liver and serum. It was a good weight gain ( higher than 209g/lamb/day), but with hight concentration of sulfur and copper for the levei normal selenium the weight gain was higher (P < 0.05), in average 236g/lamb/day. The hematocrit was not affected. (AU) | |