Dahlanuddin, S.R. McLennan, S.P. Quigley and D. P. Poppi
ABSTRACT. Rice straw (RS) is the most abundant yet under-utilised feed resource for ruminants in Indonesia. Development of feeding strategies to improve the performance of Bali cattle fed a RS basal diet will contribute to improved Bali cattle productivity and facilitate an increase cattle herd numbers in Indonesia. A 5×5 Latin square design experiment was conducted using five Bali cows (Bos javanicus) in West Nusa Tenggara, Indonesia. The five dietary treatments were: RS ad libitum (RSAL), RS ad libitum with urea/sulphate of ammonia (US) at 20 g/kg RS as fed (RSUS), RS ad libitum with a Urea Molasses Multi-nutrient Block offered at 2 g (as fed)/kg liveweight (LW).day (RSUM), RS ad libitum with rice bran (RB) and US offered at 5 g dry matter (DM)/ kg LW.day (RSRB) and RS ad libitum with Sesbania grandiflora offered at 5 g DM/kg LW.day (RSSES). Except for RSUM, all supplements increased the concentration of ammonia-N in the rumen, but only RSRB and RSSES increased the digestibility [from 48.0 % to 53.7 and 53.9% organic matter (OM) digestibility, respectively]. Supplementation had no effect on total DM intake but digestible OM (DOM) intake was significantly increased with all supplements. Microbial crude protein (MCP) production did not differ significantly between treatments. The RSRB and RSSES diets provided sufficient metabolisable energy (ME) to meet maintenance ME requirements (both at 1.02 estimated ME requirement for maintenance) while the other diets provided ME intake below maintenance requirements for Bali cows (0.72, 0.87 and 0.85 of estimated ME requirements for RSAL, RSUS and RSUM respectively).
Key Words: Bali cattle, Rice straw, Supplements, Intake, Digestibility Download File PDF