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中文摘要：
试验选用健康的三江平原放牧肉牛50头，体重在320kg左右，随机分成5组，每组10个重复，每个重复1头牛。肉牛放牧采食的同时，试验各组按牛重的0．6％、0．8％、1．0％、1．2％和1．4％每头每天分别饲喂1．9（A组）、2．5（B组）、3．3（C组）、3．8kg（D组）和4．5kg（E组）的精料补充料，预试期10d，试验期60d。旨在研究冬季放牧条件下，不同精料补饲量对放牧肉牛生长性能的影响。结果表明：（1）随着精料补饲量的增加，肉牛的平均日增重逐渐增加，B组显著高于A组（P〈0．05），C、D、E组极显著高于A组和B组（P〈0．01）；（2）饲料转化率以C组最高，为35．63％，显著高于其他各组（P〈0．05），并呈现先增加后降低的规律；（3）经济效益C组最高，C组60d育肥收入较A组极显著提高176．42％，较B组显著提高80．12％，与C组和D、E组相比略有增加，但差异均不显著（P〉0．05）。结果说明，按牛体重的1．0％补饲精料效果最好。
英文摘要：
This experiment was conducted to study the effects of different concentrate supplementation levels on growth performance of beef cattle.Under the same raising management condition,fifty Sanjiang Plain healthy beef cattle with 320 kg weight were divided into 5 groups with 10 replicates of 1 each.The difference of beginning weight was not significant （P 〉 0.05 ）.Trial groups were group A （1.9 kg）, group B （2.5 kg）, group C （3.3 kg）, group D （3.8 kg）, and group E （4.5 kg） of concentrate supplementation, respectively, according to cow weight of 0.6 %, 0.8 %, 1.0 %, 1.2 % and 1.4 %. Pre-trial period was 10 d,the trial period was 60 d.The results showed that： （1）With increasing of concentrate supple mentation, average daily gain of cattle was gradually increased.Average daily gain weight of group B cattle was significantly higher than that of group A （P 〈 0.05）,group C,D and E were extremely significantly higher than that of group A and group B （P 〈 0.01 ） ; （2）The feed conversion rate of group C was 35.63 % significantly higher than other groups （P 〈 0.05） ,and increased at first and then decreased; （3）Economic benefits in 60 d of group C was 176.42 % significantly higher than that of group A, and increased significantly by 80.12 % aganist that of group B,compared to group C, group D and group E,it was increased but the difference was not significant.The result was indicated that the optimum adding lev- els was 1.8 % of the cattle weight.
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