The Study Of Different Components Of Additive On Body Weight Gain, Digestion And Metabolism, And Rumen Digestion Of Ram

In this study, different components (micro-mineral, vitamin, amino acid, antibiotic) of additives superimposed to feed lamb in order to study the effect of them on body weight gain, digestion and metabolism, and rumen digestion of ram lamb. The results were as follow:In test 1, 100 the first hybrid of Romney X Merino ram lambs were divided into 5 groups (20 animals each group) on basis of initial body weight. 4 groups were fed on the additive with components of micro-mineral (mi.), mi.+vitamin (v.), mi.+v.+amino acid (aa.), and mi.+v.+aa.+antibiotic (ab.), respectively, except group 1 in order to research the effect of them on body weight gain of ram lambs. The results demonstrated that micro-mineral, amino acid and antibiotic components adding increased body weight gain, intake of roughage and concentrate conversion efficiency by 29.2%, 9.1% and 9.7%, respectively, whereas vitamin components decreased body weight gain, intake of roughage and concentrate conversion efficiency by 8.8%, 0.5% and 8.8%, respectively. Significant effect was found from mi.+v.+aa.+antibiotic components of additive on body weight gain, intake of roughage and concentrate conversion efficiency of ram lamb by 40.9% (p<0.01), 15.7% and 40.7%, respectively, when they were compounded. It indicated that mi., v., aa., and ab. components of additive served the function of enhancing body weight gain, intake of roughage and concentrate conversion efficiency of ram lamb, but vi. components adding decreased that of them. It was the most significant when they were compounded.In test 2, 24 Romney X Merino ram were divided into 4 groups on basis of initial body weights in order to study the effect of the different components (micro-minerals, vitamin + amino acid, antibiotic) of additives on the digestion and metabolism of ram. It was shown that micro-mineral component adding increased the apparent digestibility of DM, OM, CP, cellulose, and semi-cellulose in diet by 7.9% (p<0.05), 7.8% (p<0.05), 4.6% (p>.05), 13.1% (p<0.05) and 13.8% (p<0.05) respectively, and increased N digestion , N retention and utilizing efficiency of absorbed N by 8.5% (p>0.05) ,18.3% (p>0.05) and 10.5% (p>0.05) respectively. Vitamin + amino acid component adding did not increase apparent digestibility of DM, OM, CP, cellulose in diet, however, it increased N digestion, N retention and utilizing efficiency of absorbedN by 2.7% (p>0.05"), 10.2% (p>0.05) and 8.0% (p>0.05) respectively. Antibiotic component adding increased nitrogen excretion from urine therefore the utilizing efficiency of absorbed Ndecreased by 9.7%. The results indicated that the effect of components of the additive on the intake and digestion of diet is superimposed, namely, every component contributes to it, but it is the most significant when they are compounded (p<0.01) .In test 3, the first hybrid of Romney X Merino rams with age of 2 years were fitted fistula in the rumen and duodenum and used to study the effects of different components of additives on the metabolism in the rumen. The results demonstrated that micro-mineral, vitamin, amino-acid, antibiotic components adding increased digesta flow by 8.5% (p<0.05), 3.9%, 5.4% and 4.6%, respectively. Micro-mineral, amino-acid, antibiotic components adding increased MCP yield in rumen by 16.6%, 7.4% and 6.5%, respectively.. Micro-mineral and amino acid components adding increased efficiency of MCP synthesis by 17.2% and 3.5%, respectively. No significant effect was found from vitamin component adding on MCP yield and efficiency of MCP synthesis, but antibiotic component adding decreased efficiency of MCP synthesis in rumen by 4.1%. Therefore, each component of additive has the function of increasing digesta flow. Micro-mineral and amino acid components adding serve the function of improving MCP yield and enhancing NH3-N utilization ratio of rumen. Antibiotic component adding has the function of increasing MCP yield, but it decreased the efficiency of MCP synthesis. It showed that antibiotic component adding relatively decreased NH3-N utilization ratio...