 | Abstract 640MULTI-NUTRIENT BLOCKS (MUB) AS SUPPLEMENT FOR MILKING COWS FED FORAGES OF LOW NUTRITIVE VALUE IN SOUTH VIETNAMBui Xuan An*, Luu Trong Hieu* and T R Preston** * University of Agriculture and Forestry, Thu Duc, Hochi Minh City, Vietnam ** Convenio Interinstitucional para la Producción Agropecuaria en el Valle del rio Cauca (CIPAV) AA 7482, Cali, Colombia. Livestock Research for Rural Development 1991 3(2): 1-7. Two experiments were carried out at An Phuoc state farm and on private small farms to determine animal response, farmer acceptance and benefits of supplementing MUB to crossbred Holstein cows. EXPERIMENT 1: On 3 small farms, seven milking cows fed rice straw, native grasses and concentrate were supplemented with 1 kg MUB (5% urea) during 40 days. Milk yield and milk fat content (before and after supplementation) were 7.17 kg/d, 3.4% and 8.17 kg/d and 3.9% respectively. EXPERIMENT 2: Ten cows were divided in two groups: control fed low quality grass and crop by-products and concentrate (as basal diet); experiment group fed basal diet plus 1kg MUB (10%urea)/d. The experiment lasted 140 days. Milk yield, adjusted by covariance for yield prior to starting the trial was (kg/d): 6.257 and 7.203 (SEmean ±0.069) for the control and MUB supplemented animals. This abstract relates to the following species:
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