Evaluation of Dry Matter Intake and Average Daily Gain Predicted by the Cornell Net Carbohydrate and Protein System in Crossbred Growing Bulls Kept in a Traditionally Confined Feeding System in China

摘要: Two separate animal trials were conducted to evaluate the coincidence of dry matter intake (DMI) and average daily gain (ADG) predicted by Cornell Net Carbohydrate Protein System (CNCPS) observed actually in crossbred growing bulls kept a traditionally confined feeding system China. In Trial 1, 45 Simmental×Mongolia F1 assigned three treatments (T1-3) with 15 animals each treatment. 2 was 60 Limousin×Fuzhou F2 allocated 4 (t1-4). All individual stalls. DMI ADG for bull measured as mean data about animals, environment, management feeds required CNCPS model collected, predictions generated on Subsequently, model-predicted compared recorded results. 93.3, 80.0 73.3% points fell within range from -0.4 0.4 kg/d bias; similarly, four 2, 86.7, 73.3, 73.3 80.0% same range. These results indicate that can accurately predict There no significant differences between T1 (p = 0.06) T2 0.09) t1 0.07), t2 0.14) t4 0.83) 2. However, values T3 1 (p<0.01) t3 0.04). By regression analysis, statistically different value intercept zero equation or an identical obtained, whereas slopes significantly unity both ADG. Additionally, small root square error (RMSE) obtained unbiased estimator two variances (DMI ADG). Thus, present indicated give acceptable estimates