RT - Journal Article T1 - Effect of Two Urea Levels on Chemical Composition and Digestibility of Whole-crop Barley Silage and on Feedlot Performance of Lambs JF - JCPP YR - 2003 JO - JCPP VO - 6 IS - 4 UR - http://jcpp.iut.ac.ir/article-1-142-en.html SP - 127 EP - 139 K1 - Whole-crop barley silage K1 - Urea K1 - Digestibility K1 - BUN K1 - Feedlot performance AB - The effect of adding two urea levels (0.5 and 0.75% on fresh basis) to whole-crop barley (WCB) on chemical compositon and digestibility in Ghezel rams was studied. The effect of including these silages in the ration of fattening Ghezel and Mehraban rams was also investigated. Urea supplementation of WCB silage resulted in an increase in pH, total nitrogen level, and ammonia-nitrogen concentrations (P0.05), but apparent digestibility coefficient of total nitrogen was higher for 0.5% urea-WCB silage. Apparent digestibility coefficients of total nitrogen and nitrogen balance were higher for 0.5% urea-WCB silage than for 0.75% urea-WCB silage, but the differences were not significant. Ruminal fluid pH at 2.5 h, and ammonia-nitrogen concentration at 4 h post-feeding were higher for 0.75% urea-WCB silage than for 0.5% urea-WCB silage (P LA eng UL http://jcpp.iut.ac.ir/article-1-142-en.html M3 ER -