تاثير استفاده از مكمل هاي معدني بر ري رشد بره هاي نر چرا كننده در مراتع سميرم

The effect of mineral block consumption on growth of grazing lambs in Semirum range

Investigation on Semirum range forage from mineral status point of view have been shown that phosphorus, magnesium and copper content of these forages were deficient. Therefore the consumption ofʹ mineral supplement is essential. The aim of this experiment was evaluation effects of mineral supplement on growth and body weight of lambs in range of Semirum. Sixty-six native lambs from Semirum area were used for this trial during months of ,lone and Oct. of 2000 (grazing season). All Iambs were adapted fir 14 days on range at Hamzavi Research Station. Then the lambs were allocated to 3 treatment groups on the live weight basis. Control group had an average live weight of 26.44±3.84 Kg with no access to mineral blocks. Second group with an average live weight of 26.45±3.76 Kg with access to common mineral block (CMB). Third group with an average live weight ofʹ 26.43 ± 3.80 Kg with access to special mineral block (SMB), which provides deficient mineral in Semirum range forages. All lambs were grazed on the range from morning until evening and then they were housed in individual pen for night. All groups had ad libitum access to water and mineral supplement for only group 2 and 3. Lambs body weights were taken monthly. The intake of mineral blocks had significant effect on the body weight and growth rate of lambs in last month of grazing period (Ps 0.05). Daily gain and live weight gain of lambs in treatment group of 2 and 3 were significantly higher than control (P<. 0.01). However daily live weight gain SMB group were higher than CMB group but there were no significant difference between them.