目的 为研究有机酸肠道调节剂对奶牛产奶量、采食量和主要DHI 指标的作用效果。方法 选择388 头泌乳母牛,根据体重、产奶量、泌乳天数,按照随机区组设计分为两组,1组为对照组（日粮不添加肠道调节剂）、2组为试验组（日粮中每头每天添加48 g有机酸为主要成分的肠道调节剂）。结果 试验组比对照组产奶量平均提高了1.1 kg/d·头（P<0.05）,干物质采食量平均增加0.84 kg/d·头（P<0.05）,乳脂肪含量增加0.20 个百分点（P<0.05）,乳中脂蛋比显著高于对照组（P<0.05）,对乳蛋白含量、体细胞计数（万个/mL）、体细胞评分、乳尿素氮含量无影响。结论 在日粮中添加有机酸肠道调节剂能够提高奶牛产奶量、干物质采食量和乳中脂肪含量。
[Objective] This study was to investigate the effect of supplemental intestinal modulator containing organic acids on milk yield， dry matter intake and main DHI parameters of dairy cows.[Method] Three hundred eighty-eight Chinese Holstein cows were divided into two groups according to random block design with milk yield，day in milking and parity. The animals were fed basic diets without intestinal modulator（control）or with 48 gram per cow per day intestinal modulator（treatment）.[Result] The milk yield，dry matter intake and milk fat content was improved 1.1 kg/d·h（P＜0.05），0.84 kg/d·h（P＜0.05）and 0.2 percentage point（P＜0.05）by treatment，respectively. Cows fed with intestinal modulator had greater ratio of milk fat to protein（P＜0.05）. There was no effect of intestinal modulator on milk protein content，somatic cell count，somatic cell score，milk urea nitrogen.[Conclusion] Supplemental intestinal modulator containing organic acids was improved milk yield，dry matter intake and milk fat content of dairy cows.
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