Comparative Utilization of Urea, Isobutylidene-Diurea, Monomethylol-Urea and Soyabean-Meal with Barley Based Ration1 Kausfial J.R.2, Swan H.3, Lewis D. School of Agriculture, University of Nottingham, Sutton Bonington, Loughborough, Leics., LE12 5RD, England 2Present address: Department of Animal Science, Punjab Agricultural University, Ludhiana-141004, India.
3Present address : Group Development Manager, George Worrell and Sons Ltd., 46-50 East Parade, Harrogate Yorks., England.
1Part of the thesis approved by the University of Nottingham for the award of Ph.D. degree. Online published on 21 January, 2012. Abstract Utilization of nitrogen from throe promising slow-release urea derivatives, viz. etude monomethylol-urea (MMU-I), purified raonomethylol-urea (MMU-H) and isobutylidene-dlurea (IBDU) were compared with SBM and urea in a barley based ration fed to sheep. The level of substitution was equivalent to 2% urea. Daily nitrogen intake was 31+0.5 g. The DM digestibility was minimum (76.5% I with MMU-I diett Purification of MMU from 20% N content to 22.4% N content improved both DM digestibility and N retention. Fractionation of faecal N revealed that 0.6, 9.2 and 23.9% of 1BDU, MMU-H and MMU-I, respectively were not digested. Maximum of absorbed N was retained with MMU-H (25.4%) followed by IBDU (25.0%), SBM (23.0%), MMU-I (22.2%) and urea (21.0%). The BV of 50, 47, 46, 45 and 39 for MMU-H, IBDU, MMU-I, SBM and urea diets were recorded, respectively. Among the slow-release urea derivatives MMU-II proved a better NPN source. Top |