摘要
The transition period is a crucial stage in the lactation cycle and can lead to significant metabolic changes in cows. The use of nutritional interventions, such as direct-fed microbials, may assist cows during the transition from pregnancy to early lactation, reducing the occurrence of metabolic disorders and improving overall health. The primary goal of this study was to assess the effects of a commercial rumen-derived direct-fed microbial (DFM) product (Galaxis™ Frontier (GF) Native Microbials Inc., CA, USA) on various factors such as performance, blood biomarkers, rumen fermentation, and bacterial population in dairy cows during the transition period up to 100 d in milk (DIM). Overall, the results showed that rumen derived DFM supplementation could promote positive responses on performance, such as milk yield and feed efficiency. In the rumen, the DFM product contributed to increased butyrate and valerate, accompanied by an improved ruminal abundance of lactic acid-utilizing bacteria. Moreover, DFM supplementation may have influenced lipid metabolism, leading to greater oxidative stress and inflammation within non-pathological levels. In conclusion, our study suggests that supplementing DFM during the transition period to mid-lactation can positively impact lactation performance and the rumen environment, indicating an overall beneficial effect.
摘要译文
过渡期是泌乳周期中的关键阶段，可以导致牛的代谢变化。在从妊娠到早期泌乳过渡期间，使用营养干预措施（例如直接喂养的微生物）可以帮助母牛，从而减少了代谢性疾病的发生并改善了整体健康状况。这项研究的主要目的是评估商业瘤胃衍生的直接喂养微生物（DFM）产品（GARAXIS™Frontier（GF）Native Microbials Inc.，CA，USA）对性能，血液生物标志物等各种因素的影响在过渡期内，牛奶奶牛的瘤胃发酵和细菌种群在牛奶中最高100 d（昏暗）。总体而言，结果表明，瘤胃衍生的DFM补充可以促进对性能的积极反应，例如牛奶产量和饲料效率。在瘤胃中，DFM产物导致丁酸酯和瓣膜增加，并伴随着乳酸酸性细菌的瘤胃丰富。此外，补充DFM可能影响了脂质代谢，从而导致非病理学水平内的氧化应激和炎症更大。总之，我们的研究表明，在过渡期间补充DFM为中期可以积极影响泌乳性能和瘤胃环境，这表明总体有益效果。
Lopez, Marcela Bulnes. In-Vivo Assessment of a Direct-Fed Microbial on Lactation Performances, Blood Biomarkers, Ruminal Fermentation and Microbial Abundance in Transition to Mid-Lactation Holstein Cows.[D]. US: South Dakota State University, 2023