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Abstract：
The present study investigated the effects of various inclusion levels of dietary Chinese herbal medicine (CHM) preparation on feed consumption, milk yield and milk composition, serum biochemistry, hematological profile, and reproductive efficiency of Holstein dairy cows. A total of 117 lactating Holstein cows were randomly divided into four groups as control (n = 27; without CHM supplementation) and treatment groups CHM-0.5 (n = 31), CHM-0.75 (n = 29), and CHM-1 (n = 30) fed diet supplemented with 0.5, 0.75, and 1 kg/cow/d for 30 days, respectively. The study began at d 20 postpartum (d 0 of the study). At d 50 postpartum, the cows in all groups were subjected to estrus synchronization using a modified Ovsynch protocol (GPGMH) and observed for reproductive variables. Feed intake, milk yield and milk composition, serum biochemistry and hematological profile, and reproductive efficiency were measured. A significantly higher milk yield with improved milk lactose, milk protein and milk fat were found in the CHM-0.75 group compared to the other groups (p < 0.05). Besides, the estrus response, ovulation rate, ovulatory follicle diameter, and pregnancy rate increased in CHM-0.75 compared to CHM-0 or CHM-0.5 group (p < 0.05). The serum metabolites (glucose, AST, arginine, BUN, and NO) showed variations among the treatment groups at different time points (synchronization, AI, or post-AI). In conclusion, CHM supplementation improves the milk yield, milk composition, and serum metabolites in dairy cows. Daily supplementation of 0.75 kg CHM before the GPGMH protocol application enhances the reproductive traits in dairy cows under summer conditions.
摘要：
本研究调查了日粮中草药（CHM）制剂的各种包含水平对饲料消耗的影响，产奶量和牛奶成分，血清生物化学,血液学特征,和荷斯坦奶牛的繁殖效率。将117头泌乳荷斯坦奶牛随机分为四组作为对照组（n=27；不补充CHM）和处理组CHM-0.5（n=31），CHM-0.75（n=29），和CHM-1（n=30）饲喂饮食，补充0.5、0.75和1kg/牛/天，持续30天，分别。研究在产后第20天(研究的第0天)开始。在产后50天，使用改良的Ovsynch方案(GPGMH)对所有组的奶牛进行发情同步,并观察其繁殖变量.饲料摄入量,产奶量和牛奶成分，血清生物化学和血液学特征，并测量了生殖效率。一个显著更高的牛奶产量与改善牛奶乳糖，与其他组相比,在CHM-0.75组中发现乳蛋白和乳脂肪(p<0.05)。此外,发情反应，排卵率,排卵卵泡直径，与CHM-0或CHM-0.5组相比，CHM-0.75组的妊娠率增加（p<0.05）。血清代谢物（葡萄糖，AST,精氨酸BUN,和NO)显示不同时间点治疗组之间的变化(同步，AI,或后AI)。总之,补充CHM可以提高产奶量，牛奶成分，和奶牛的血清代谢产物。在GPGMH方案应用之前，每天补充0.75kgCHM可增强夏季条件下奶牛的繁殖性状。
