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中文摘要：
为测定秋季放牧条件下，不同精料补饲量对放牧肉牛生产性能的影响，试验选择50头体重约350kg的健康肉牛随机分成5组（A、B、c、D、E组），每组10个重复，每个重复1头牛。肉牛放牧采食的同时，各试验组分别按牛重的0．0％、0．3％、0．6％、0．9％和1_2％每头每天分别饲喂0、1．1、2．1、3．2kg和4-2kg的精料补充料；预试期7d，试验期45d。结果表明：（1）随着精料补饲量的增加，肉牛平均日增重逐渐增加，A组，即未补饲精料补充料组为负值。B、C、D组间差异显著（P〈0．05），D组和E组差异不显著（P〉0．05），D组日增重较B、C组提高132．71％和43．55％：（2）经济效益，A组为损失，D组最高，D组育肥收入分别较B组和C组提高了116．44％和40．42％。D组和E组相比略有增加，但差异不显著（P〉0．05）。由此可见，三江平原放牧肉牛秋季按牛体重的0．9％补饲精料效果最佳。
英文摘要：
The experiment was conducted to study the effects of different concentrate supplementation levels on growth performance of beef cattle in autumn.Under the same raising management condition,fifty Sanjiang Plain healthy beef cattle with 350 kg boby weight were divided into 5 groups with 10 replicates of 1 each.The difference of beginning weight was not significant （P 〉 0.05）.Trial group A,group B,group C,group D,and group E supplemented with 0,1.1,2.1,3.2,4.2 kg concentrate,respectively ,according to cow weight of 0.0% ,0.3% ,0.6% ,0.9% and 1.2%.Pre-trial peri- od was 7 d, the trial period was 60 d.The results showed that： （1）With increasing of concentrate supplementation, average daily gain of cattle gradually increased.Average daily gain weight of group A was losing,there was sighificant difference a- mong B,C ,D group;group D were 132.71% and 43.55% significantly higher than that of group B and group C（P 〈 0.05）; compared to group E,it was increased but the difference was not significan （P 〈 0.05）. （2）Economic benefits in 45 d of group D were 116.44% and 40.42% higher than that of group B and group C （P 〈 0.05） ;compared to group E,it was in- creased but no significant difference （P 〈 0.05）;group A was losing.The results were indicated that optimum adding levels was 0.9% of the cattle weight in the autumn.
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