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A multi-species direct-fed microbial supplement alters the milk lipidome of dairy cows. | LitMetric

AI Article Synopsis

  • - The study examined how a multi-species direct-fed microbial (DFM) supplement affects the milk lipid composition of lactating dairy cows over a 91-day period, using 24 Holstein cows divided into control and DFM treatment groups.
  • - Milk samples were analyzed for lipid content, revealing that the DFM supplementation increased long-chain polyunsaturated fatty acids (LC-PUFA) and certain triacylglycerides while decreasing some saturated fatty acids and triacylglycerides, indicating a change in the milk's fatty acid profile.
  • - The results suggest that the DFM could enhance the health benefits of milk produced by dairy cows by improving the fatty acid composition, making it potentially healthier for consumers.

Article Abstract

The study evaluated the effects of supplementing a multi-species direct-fed microbial (DFM) on the milk lipidome of lactating dairy cows. Twenty-four multiparous Holstein cows (41 ± 7 d in milk) were used in a randomized complete block design with experimental duration of 91 d. Cows were blocked based on energy-corrected milk yield from a 14-d pretreatment period, and were assigned randomly within each block to the following treatments: (1) control (CON): corn silage-based total mixed ration without DFM; or (2) BOV+: basal diet top-dressed with a DFM containing a mixture of (LA-51), (PF-24), (CH201), and (CH200) at 11.8 × 10 cfu/d. Milk samples were taken from morning and evening milkings on 2 consecutive days of each week of the pretreatment and treatment periods. Separate composites of pretreatment period and treatment period samples were prepared for individual cows and used for lipidome analysis. Lipidome analysis of the milk samples was performed using an ultra-high-performance liquid chromatograph linked to a quadrupole time-of-flight mass spectrometer in both positive and negative ionizations. The relative concentrations of 14 lipid species, including long-chain polyunsaturated fatty acids (LC-PUFA) such as FA 20:8 and FA 28:7 and triacylglycerides (TG) such as TG 40:3 and TG 54:2, were increased [false discovery rate (FDR) ≤0.05], whereas 13 lipid species, including saturated FA 24:0 and TG 40:0 were decreased (FDR ≤0.05) by supplemental BOV+. The relative concentration of de novo FA in milk was greater, whereas that of preformed FA was lower in dairy cows supplemented with BOV+. Results from this study demonstrate the potential of a DFM containing , and to alter the milk lipidome in lactating dairy cows toward increased relative concentration of LC-PUFA, which might offer a healthier profile of FA to consumers with its associated health benefits.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9873687PMC
http://dx.doi.org/10.3168/jdsc.2022-0244DOI Listing

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