Document Type : Research Paper
Authors
Razi University
Abstract
This study was conducted to evaluate the effect of dietary inclusion of zinc-methionine and seleno-methionine on feed intake, rumen fermentation and protozoa population in sheep. In Exp. 1, 20 Sanjabi rams were assigned to one of the four treatments as: 1) basal diet or control without Zn-met and Se-met ; 2) basal diet supplemented with 300 mg Se kg-1 of DM; 3) basal diet supplemented with 400 mg Zn kg-1 of DM;4)basal diet supplemented with 300 mg Se plus 400 mg Zn Kg-1 of DM . In Exp. 2, the fermentation parameters were studied by an in vitro gas test using the rumen fluid from control rams. The gas test was conducted for the treatments as: 1) basal diet or control; 2) basal diet supplemented with 300 mg Se/30 ml rumen fluid ; 3) basal diet supplemented with400 mg Zn/200mg of 30 ml RF; 4) basal diet supplemented with300 mg Se and 400 mg of Zn /200mg of 30 ml RF . In Exp. 1, metabolisable energy, organic matter digestibility, ammonia nitrogen and total short chain fatty acids were decreased by Zn-met and Se–met supplementation , however, the partitioning factor and microbial protein were improvedin treatments containing mineral supplement. In conclusion, the addition of Zn-met and Se-met had no useful effect on the rumen fermentation parameters of sheep, however, the protozoa population was increased. Also in this study, in vitro method was not a suitable index for evaluating the effect of mineral supplements on the in vivo rumen fermentation.
Keywords
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