Shrub coverage alters the rumen bacterial community of yaks (Bos grunniens) grazing in alpine meadows
| العنوان: | Shrub coverage alters the rumen bacterial community of yaks (Bos grunniens) grazing in alpine meadows |
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| المؤلفون: | Chuntao Yang, Yang Liu, Fujiang Hou, Guru Tsedan |
| المصدر: | Journal of Animal Science and Technology, Vol 62, Iss 4, Pp 504-520 (2020) |
| بيانات النشر: | Korean Society of Animal Sciences and Technology, 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | Firmicutes, alpine shrub meadow, Veterinary (miscellaneous), ved/biology.organism_classification_rank.species, Forage, Biology, Biochemistry, Genetics and Molecular Biology (miscellaneous), Pasture, Shrub, bacterial community, 03 medical and health sciences, Rumen, Animal science, shrub, Grazing, 030304 developmental biology, yak, lcsh:SF1-1100, 0303 health sciences, geography, geography.geographical_feature_category, Ecology, 030306 microbiology, ved/biology, Lachnospiraceae, biology.organism_classification, Animal Science and Zoology, lcsh:Animal culture, qinghai-tibet plateau, Food Science, Ruminococcaceae |
| الوصف: | Proliferation of shrubs at the expense of native forage in pastures has been associated with large changes in dry-matter intake and dietary components for grazing ruminants. These changes can also affect the animals’ physiology and metabolism. However, little information is available concerning the effect of pastoral-shrub grazing on the rumen bacterial community. To explore rumen bacteria composition in grazing yaks and the response of rumen bacteria to increasing shrub coverage in alpine meadows, 48 yak steers were randomly assigned to four pastures with shrub coverage of 0%, 5.4%, 11.3%, and 20.1% (referred as control, low, middle, and high, respectively), and ruminal fluid was collected from four yaks from each pasture group after 85 days. Rumen fermentation products were measured and microbiota composition determined using Ion S5TM XL sequencing of the 16S rRNA gene. Principal coordinates analysis (PCoA) and similarity analysis indicated that the degree of shrub coverage correlated with altered rumen bacterial composition of yaks grazing in alpine shrub meadows. At the phyla level, the relative abundance of Firmicutes in rumen increased with increasing shrub coverage, whereas the proportions of Bacteroidetes, Cyanobacteria and Verrucomicrobia decreased. Yaks grazing in the high shrub-coverage pasture had decreased species of the genus Prevotellaceae UCG-001, Lachnospiraceae XPB1014 group, Lachnospiraceae AC2044 group, Lachnospiraceae FCS020 group and Fretibacterium, but increased species of Christensenellaceae R-7 group, Ruminococcaceae NK4A214 group, Ruminococcus 1, Ruminococcaceae UCG-002, Ruminococcaceae UCG-005 and Lachnospiraceae UCG-008. These variations can enhance the animals’ utilization efficiencies of cellulose and hemicellulose from native forage. Meanwhile, yaks grazed in the high shrub-coverage pasture had increased concentrations of ammonia nitrogen (NH3-N) and branched-chain volatile fatty acids (isobutyrate and isovalerate) in rumen compared with yaks grazing in the pasture without shrubs. These results indicate that yaks grazing in a high shrub-coverage pasture may have improved dietary energy utilization and enhanced resistance to cold stress during the winter. Our findings provide evidence for the influence of shrub coverage on the rumen bacterial community of yaks grazing in alpine meadows as well as insights into the sustainable production of grazing yaks on lands with increasing shrub coverage on the Qinghai-Tibet Plateau. |
| اللغة: | English |
| تدمد: | 2055-0391 2672-0191 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ac0d2d31f718d49198e3df9a641b827eTest http://www.ejast.org/archive/view_article?pid=jast-62-4-504Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....ac0d2d31f718d49198e3df9a641b827e |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 20550391 26720191 |
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