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Effect of direct-fed microbial on commercial dairy drylot.

J. Lefler



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Effect of direct-fed microbial on commercial dairy drylot.
J. Lefler*1, S. Minini1, A. Morandi2, M. Embree1. 1Ascus Biosciences San Diego, CA, 2Independent Nutritional Advisor Argentina.

The rumen microbiome plays a key role in the digestion of feed components, allowing the dairy cow access to nutrients and compounds that are crucial for milk production and health. As such, optimizing the productivity of the rumen microbiome is an overlooked strategy for increasing the performance of the animal. This study evaluated the efficacy of an orally administered, daily microbial feed supplement (MFS; Galaxis, Ascus Biosciences, San Diego, California) on a commercial dairy. One-hundred and 40 one, multiparous Holstein cows (DIM = 23 +/− 15) were split into 2 groups, 1 of which was fed an MFS containing 2 native rumen microbes (Clostridium beijerinckii and Pichia kudriavzevii) mixed daily with a TMR ration (30% Corn silage, 11% soy flour, 23% ground corn, 8% mineral premix, 2% wheat straw, 8% cottonseed, 6% ground soybean shell, 5% alfalfa hay, 7% alfalfa silage). The MFS was administered daily for 216 d on farm. The cows were milked 3 times a day and milk components were measured monthly. Mixed effects model analysis was conducted with cow ID specified as the subject and an imposed autoregressive covariance via the R package “nlme.” Estimated marginal means were subsequently generated to compare the difference in response between treatment and control across weeks of trial via the R package “emmeans.” The treatment by week interaction was significant (P < 0.001) for daily milk yield, which exhibited a 2.8 L (7.9%) increase in milk yield across the entire trial period. Milk components showed small changes in yield (kg) between treatment and control — most of which were non-significant except for milk fat (P = 0.01), which showed a roughly 2.3% decrease across the entire trial period. Energy-corrected milk (ECM) increased roughly 1.4% across the entire trial period (P = 0.4). These findings demonstrate the promise of using microbial based feed supplements in the improvement of herd production.

Keywords: microbial supplement, Clostridium, Pichia.