Eighteen Jersey and crossbred cattle heifers initially about 286 kg LW and 29 months of age were divided into three groups on the basis of age and live weights. Three experimental rations viz. 1. untreated rice straw ad libitum + 2 kg CM + Mineral lick (RS ), 2. Urea supplemented rice straw ad libitum + 2kg CM  + Mineral lick (USERS) were given at random to each group of animals. RS, USRS and UTRS had 9.7, 19.0 and 11.0 % crude protein contents. In takes of DM, OM, NDF, ADF. Cellulose, Hemicellulose, Lignin, CP, Mineral and Water, CP balance, LW again, and digestibility of DM, NDF, Cellulose, and Hemicelluloses were not found significantly different between R.s, USRS and UTRS. However, UTRS had significantly higher (P<0.05) OM and ADF digestibility than RS, and RS and USRS, respectively. Although the mean difference in the daily LW gain of the animals recieving RS , USRS and UTRS was not significant L W gain tended to be higher on the groups of animals receiving USRS and UTRS.

Eighteen Jersey and crossbred cattle heifers initially about 286 kg LW and 29 months of age were divided into three groups on the basis of age and live weights. Three experimental rations viz. 1. untreated rice straw ad libitum + 2 kg CM + Mineral lick (RS ), 2. Urea supplemented rice straw ad libitum + 2kg CM  + Mineral lick (USERS) were given at random to each group of animals. RS, USRS and UTRS had 9.7, 19.0 and 11.0 % crude protein contents. In takes of DM, OM, NDF, ADF. Cellulose, Hemicellulose, Lignin, CP, Mineral and Water, CP balance, LW again, and digestibility of DM, NDF, Cellulose, and Hemicelluloses were not found significantly different between R.s, USRS and UTRS. However, UTRS had significantly higher (P<0.05) OM and ADF digestibility than RS, and RS and USRS, respectively. Although the mean difference in the daily LW gain of the animals recieving RS , USRS and UTRS was not significant L W gain tended to be higher on the groups of animals receiving USRS and UTRS.