Research oncomposition of total mixed rationfor F1 crossbreed (BBB x Lai Sind) in the period from 13 to 18 months of age
An experiment was conducted to determine the suitable formulaes of total mixed ration (TMR) for F1 crossbreed (BBB × Lai Sind) in the period from 13 to 18 months of age. A total of 24 bulls were divided into 4 groups. All groups used the same diet ingredients such as cornmeal, soybean cake, beer brewers, molasses, urea, but different of fiber ingredients in each group. Group 1 used 20% untreated rice straw, group 2 used 20% urea treatedrice straw, group 3 used 20% whole crop maize silage and group 4 used 10% urea treated rice straw and 10% whole crop maize silage. The ingredients of TMR were mixed before every meal, elephant grass was choped 2-3cm short before TMR mixing. Bulls were fed freely 2 meals/day, drinking water freely. Mineral needs are met by a licking block thathang above the feeder in the barn. Each bull was raised individually, numbered to determine the criteria: bodyweight gain, daily feed intake. The experimental results showed that the bulls in group 3 (using whole crop maize silage) had a significantly higher bodyweight than the bulls in group 1 (using untreated rice straw), 553.50 and 537.66kg. Bulls in group 3 (using whole crop maize silage) had not much higher bodyweight than bulls in group 2 (using urea treated rice straw) and bulls in group 4 (using a combination of whole crop maize silage and urea treated rice straw). The treatment of rice straw with urea improved the nutritional value of rice straw, improved the average bodyweight gain of bulls (1.04 and 1.07 kg/day compared to 0.98 kg/day). Use diets with ME 9.5-10.0 MJ/kg and crude protein 14.0-15.0% in diet DM with combination of elephant grass – urea treated rice straw – whole crop maize silage gave highly efficiency (high average bodyweight gain, low feed conversion ratio and low feed cost per 1kg bodyweight gain, take advantage of using of agricultural by-products).
