A total of 16 Xia Nan cattle with an initial weight of about 490 kg were randomly assigned to two groups with eight replicates,including the treatment group with niacin supplementation 800 mg/kg and the control group.This experiment was conducted to study the effect of niacin on the growth performance,nutrient digestibility and blood biochemical index of Xia Nan cattle.The prepared test lasted 5 days and the experiment 40 day.The results showed:(1) The dry matter intake of each group had no significant difference (P>0.05);the ADG of the treatment group increased by 14.28%( P>0.05) compared with the cotrol group;the DMI/ADG of the treatment group was lower than that of the control group (P0.05) compared with the cotrol group;the NDF digestibility of the treatment group increased (P>0.05).(3)The IgG and TP contents of the treatment group were higher than those of the control group ( P>0.05);the glucose content of the treatment group increased by 2.84%( P>0.05) compared with the cotrol group;the triglycerides content of the treatment group decreased( P>0.05) compared with the cotrol group;the urea nitrogen content of the treatment group decreased by 1.86% ( P>0.05) com⁃pared with the cotrol group.In conclusion,800 mg/kg niacin added in the diet properly increased the growth of Xia Na cattle and significantly reduced the material weight ratio;niacin could improve blood biochemical inde⁃xes and nutrient digestibility of Xia Na cattle.%选取质量490 kg左右的夏南牛16头，随机分为两组，每组8头牛，试验组添加800 mg／kg的烟酸，对照组不添加。旨在研究其对夏南牛生长性能、养分消化率及血液生化指标的影响。预试期5 d，正试期40 d。结果表明：（1）两组干物质采食量差异不显著（P＞0．05）；试验组平均日增重比对照组提高了14．28％，组间差异不显著（P＞0．05）。料重比试验组极显著低于对照组（P＜0．01）。（2）试验组OM、CP、EE、ADF的消化率比对照组有所提高，但两组间差异不显著（ P＞0．05）；而试验组 NDF 与对照组相比有所降低，但两组间差异不显著（P＞0．05）。（3）IgG和总蛋白含量试验组比对照组有所提高，但各组间差异不显著（P＞0．05）；血糖试验组比对照组提高了2．84％，但是各组间差异不显著（ P＞0．05）；甘油三酯含量试验组比对照组有所降低，各组间差异不显著（P＞0．05）；尿素氮含量试验组比对照组降低了1．86％，各组间差异不显著（P＞0．05）。结果表明：在日粮中添加800 mg／kg烟酸可以适当提高夏南牛生长性能，且显著降低其料重比；烟酸对夏南牛血液生化指标和养分消化率有改善作用。
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