Effects Of Different Se Source And Suplementary Concentration On The Production Performance Of Diary Cows And The Whole Alimentary Canal Digestibility Of Steers

This experiment was conducted to investigate the most optimum selenium source and suitable addition level for ruminent animals by feeding experient and digestibility experiment. Thirty healthy Holstein diary cows were assigned into ten groups(one control group and nine treat group) randomly according bodyweigh, milk production and lactating periods to study the effects of different Se source and concentration on the production performance. Each group has three diary cows and was further subdivided into three subgroups. Each subgroup has one diary cow. Four Simmexte crossed steers fitted with permanent ruminal cannulas were used in a 4×4 Latin squre design to study the effects of different Se source and concentration on the whole alimentary canal digestibility. All fetal was collected during the experiment. Sodium selenite, Se-yeast and rumen by-pass selenium were supplemented in diary cows' and steers' dietary with the concentration of 0.3mg, 0.6mg and 0.9mg per kilogram dry material. The results showed that:(1) Compared with the control group, the decline of milk production was ameliorated afer height period of milking of selenium supplemented diary cows. The standard milk production was maintained during the period of supplementing sodium selenite and Se-yeast; and it was increased by 4.85%and 6.03% of the rumen by-pass selenium supplemented animals with concentration of 0.3mg/kgDM and0.6mg/kgDM, respectively.(2) The yields of milk fat, milk protein, milk glucose and milk dry-material of the selenium supplemented animals were increased during the experiment. Among the Se source, rumen by-pass selenium with the concentration of 0.6mg/kg was the best one, with it, the four milk components were increased by 21.09%, 45.49%, 3.72% and 11.11% respectively compared with pre-experiment.(3) Milk Se concentration of the selenium supplemented animals were increased extremely significant (p<0.01). It was increased 19.8 multiples compared with pre-experiment of the rumen by-pass selenium supplemented diary cows with the concentration of 0.6mg/kgDM.(4) Milk somatic cell counts (SCC) was declined significantly (p<0.05) of the selenium supplemented animals. It was declined by 50.49% of 0.6mg/kgDM of the rumen by-pass selenium diary cows.(5) The whole alimentary canal digestibility of CF, CP, NDF, ADF and N, Ca, P, and the availability of N, Ca, P were declined significantly (p<0.05) compared with the control group of the sodium selenite steers. But it was increased significantly of the Se-yeast and rumen by-pass selenium supplemented steers.(6) The blood glutathione peroxidase and activity were increased extremely significant (p<0.01). It was increased by 2.13 multiples during the experimented of 0.6mg/kgDM of the rumen by-pass selenium.(7) All the results of the experiment showed that rumen by-pass selenium with the concentration of 0.6mg/kg is the best Se source and suitable supplemented concentration, it is probably because rumen...