Growth Efficiency and Trace Mineral Status of Growing Awassi Lambs Fed Two Levels of Zinc Methionine

Mutassim M. Abdelrahman

Abstract


Eighteen growing Awassi lambs were used in this study to determine the effect of supplementing two levels of
protected Zinc-methionine (Zn-met) on their growth rate, trace minerals concentrations and growth performance.
The lambs were divided to three groups, the dietary treatments were the control diet (C), the control diet plus 400
mg Zn-met/ kg feed (T1), the control diet plus 800 mg Zn-met/ kg feed (T2). The lambs received 200 mg/ lamb/
day and 400 mg/ lamb/ day for T1 and T2, consequently. Lambs general performance were recorded and mineral
concentrations in blood, liver, kidney, bone and meat were analyzed using Atomic Absorption
Spectrophotometery (AAS).
Results show a significant higher (P<0.05) total gain, average daily gain and lower feed conversion ratio in
lambs from T1 compared with lambs from the control and T2 groups. No significant effect (P>0.05) of Zn-met
supplementation on total feed intake and dressing percentage. Significant effects (P<0.05) of treatment and
treatment×time interaction on Cu, Co and Mn concentrations in blood serum were detected, but no effect on Zn
concentrations. Moreover, lambs received 200-mg/ day Zn-met showed a significantly higher (P<0.05) Cu, Zn
and Co concentrations in liver and only Zn in kidney when compared with the control and T2. Zinc, Cu and Co
concentration in meat of lambs from T2 (400 mg/ lamb/ day Zn- met) were significantly higher (P<0.05) when
compared with lambs from the control and T1.
In conclusion, feeding growing Awassi lambs methionine in a form of Zn-met, with a low level of 200 mg/ lamb/
day, improved growth and utilization of dietary Cu, Zn and Co by growing lambs and consequently increased
profit.

Keywords


Awassi Lambs, Growth, Zinc Methionine, Tissues and Minerals.

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