The Effect Of Supplement Of Rare Earth On The Digestion And Metabolism In Sheep

In this experiment, 4 of Small Tail Han ewes, with the body weight of 55 kg, were fitted with the permanent duodenum and ileum canula, and were supplied rare earth at the dose of 0 (control) and 216.49 mg·kg^-1 (as DM basis) ration in the condition of the type diets which corn staff occupied 50%. The collection of the chyme of duodenum and ileum and the experiment of digestion and metabolism were done, with the experimental design of self-control, to study supplement of rare earth on the digestion and metabolism in sheep. The results showed that the voluntary intake of sheep were 1197.0±211.0 g·d^-1, and were increased to 1314.9±195.2 (P<0.01) g·d^-1 when rare earth was supplied. In forestomach, the digested amounts of DM, OM, cellulose and semi-cellulose were 662.6±141.7, 644.0±132.6, 108.0±28.9 and 86.9±17.3 g·d^-1 respectively, and were increased to 699.8±99.5 (P>0.05), 685.3±96.7 (P>0.05), 140.5±33.7 (P<0.01) and 111.0±19.6 (P<0.01) g·d^-1 respectively, when rare earth was supplied. The amounts of the DM, OM, CP, microbial crude protein, by-pass protein, total amino acids and lysine arriving at small intestine were 526.44±74.17, 460.22±67.15, 129.45±23.26, 54.20±3.86, 37.47±12.89, 52.03±2.63 and 2.89±0.21 g·d^-1 respectively, and were increased to 644.31±86.26 (P<0.01), 563.12±76.05 (P<0.01), 149.22±15.83 (P<0.05), 72.79±6.89 (P<0.01), 40.54±16.26 (P>0.05), 61.09±2.34 (P<0.05) and 3.39±0.10 (P<0.01) g·d^-1 respectively when rare earth was supplied. The amounts of the DM, OM, CP, total amino acids and lysine digested and absorbed in small intestine were 94.65±36.01, 81.76±25.47, 43.25±11.46, 32.24±3.88 and 2.17±0.27 g·d^-1 respectively, and were increased to 182.06±44.74 (P<0.01), 163.02±37.17 (P<0.01), 65.28±17.51 (P<0.01), 40.41±1.15 (P<0.05) and 2.50±0.25 (P<0.01) g·d^-1 respectively, when rare earth was supplied. The apparent digestibility of the DM, OM, CP, cellulose and semi-cellulose were 67.07±3.05%, 69.21±2.51%, 60.77±3.95%, 58.86±5.95% and 58.88±1.24% respectively in control group, and were increased to 70.51±3.40% (P<0.01), 72.59±2.85% (P<0.01), 62.24±6.36% (P>0.05), 63.99±4.57% (P<0.05) and 62.95±2.19% (P<0.05) respectively when rare earth was supplied. The digested amounts of the DM, OM, CP, cellulose and semi-cellulose were812.59±173.87, 777.52±158.09, 78.95±13.27, 124.08±34.30 and 99.58±19.35 g·d^-1 respectively, and were increased to 909.91±179.93 (P<0.01), 869.07±162.85 (P<0.01), 88.82±15.06 (P<0.05), 141.91±32.71 (P<0.05) and 109.73±20.14 (P<0.05) g·d^-1 respectively when rare earth was supplied. The retention rates and amounts of the nitrogen were 17.60±10.45% and 3.92±2.78 g·d^-1, respectively, and were increased to 21.04±9.37% (P>0.05) and 5.02±2.80 (P<0.05) g·d^-1 respectively, when rare earth was supplied. From this research, it is concluded that supplement of rare earth may increase the intake, the digestibility of feed in forestomach, and the absorbed amount of nutrients, especially amino acids, in small intestine, and therefore would significantly improve the nutritional status of the sheep.