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Susceptibility of dairy cows to subacute ruminal acidosis is reflected in both prepartum and postpartum bacteria as well as odd-and branched-chain fatty acids in feces

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Journal of Animal Science and Biotechnology 2023年第1期14卷 229-243页

作者： Hong Yang Stijn Heirbaut Xiaoping Jing Nympha De Neve leen vandaele Jeyamalar Jeyanathan Veerle Fievez Laboratory for Animal Nutrition and Animal Product Quality Department of Animal Sciences and Aquatic EcologyFaculty of Bioscience EngineeringGhent UniversityCampus Coupurebuilding F1st floorCoupure Links 6539000 GhentBelgium. State Key Laboratory of Grassland and Agro‑Ecosystems International Centre for Tibetan Plateau Ecosystem ManagementSchool of Life SciencesLanzhou UniversityLanzhou 730000China. Animal Sciences Unit Flanders Research Institute for AgricultureFisheries and FoodScheldeweg 689090 MelleBelgium.

Background:The transition period is a challenging period for high-producing dairy *** in early lactation are considered as a group at risk of subacute ruminal acidosis(SARA).Variability in SARA susceptibility in early lactation is hypothesized to be reflected in fecal characteristics such as fecal pH,dry matter content,volatile and odd-and branched-chain fatty acids(VFA and OBCFA,respectively),as well as fecal *** was investigated with 38 periparturient dairy cows,which were classified into four groups differing in median and mean time of reticular pH below 6 as well as area under the curve of pH below ***,we investigated whether fecal differences were already obvious during a period prior to the SARA risk(prepartum).Results:Variation in reticular pH during a 3-week postpartum period was not associated with differences in fecal pH and VFA *** the postpartum period,the copy number of fecal bacteria and methanogens of unsusceptible(UN)cows was higher than moderately susceptible(MS)or susceptible(SU)cows,while the genera Ruminococcus and Prevotellacea_UCG-001 were proportionally less abundant in UN compared with SU ***,only a minor reduction was observed in iso-BCFA proportions in fecal fatty acids of SU cows,particularly iso-C15:0and iso-C16:0,compared with UN *** with the bacterial changes postpartum,the lower abundance of Ruminococcus was already observed in the prepartum fecal bacterial communities of UN cows,whereas Lachnospiraceae_UCG-001 was ***,no differences were observed in the prepartum fecal VFA or OBCFA profiles among the *** fecal bacterial communities of cows were clustered into two distinct clusters with 70%of the SU cows belonging to cluster 1,in which they represented 60%of the ***:Inter-animal variation in postpartum SARA susceptibility was reflected in post-and prepartum fecal bacterial *** in prepartum fecal bacte

关键词： Fecal bacterial community Fecal odd-and branched-chain fatty acids Inter-animal variation Subacute ruminal acidosis

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Management strategies to improve the nitrogen use efficiency in grasslands and the protein quality in grass silages:Lessons from a practical study on dairy farms in Flanders

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Grassland Research 2024年第1期3卷 18-32页

作者： Tine Van den Bossche Johan LDe Boever Geert Haesaert Mathias Cougnon Sandra Debevere leen vandaele Karen Goossens ILVO MelleBelgium Department of Plant and Crops Ghent UniversityGhentBelgium Inagro Rumbeke-BeitemBelgium

Background:Long-term overgrazing has led to severe degradation of grasslands,posing a signiﬁcant threat to the sustainable use of grassland ***:Based on the investigation of changes in functional traits and photosynthetic physiology of Stipa breviﬂora under no grazing,moderate grazing,and heavy grazing treatments,the changes in expression patterns of genes and proteins associated with different grazing intensities were assessed through integrative transcriptomic and proteomic ***:Differentially expressed genes and proteins were identiﬁed under different grazing *** were mainly related to RNA processing,carbon metabolism,and secondary metabolite ***ﬁndings suggest that long-term grazing leads to molecular phenotypic plasticity,affecting various biological processes and metabolic pathways in ***ﬂ*** analysis revealed low correlation between the transcriptome and the proteome,indicating a large-scale regulation of gene expression at the posttranscriptional and translational levels during the response of ***ﬂora to *** expression proﬁles of key genes and proteins involved in photosynthesis and phenylpropanoid metabolism pathways suggested their synergistic response to grazing in ***ﬂ***:Our study provides insight into the adaptation mechanisms of ***ﬂora to grazing and provides a scientiﬁc basis for the development of more efﬁcient grassland protection and utilization practices.

关键词： clover grassland grasssilage management nitrogenuseefficiency proteinquality

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