Temporal changes in gastrointestinal microbiomes of beef cattle on feedlot placement

Brianna Maslen, Michael Campbell, Seyed Ghorashi, Sam Pant

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Introduction: A majority of beef cattle are finished in feedlots after purchase. However, feedlot placement has also been found to adversely influence cattle health, predisposing them to many diseases including Bovine Respiratory Disease
(BRD). BRD is an important feedlot disease causing significant economic losses in beef cattle. While the influence of feedlot transition on disease predisposition is known to be mechanistically complex and multifactorial, the host microbiome could play a key role. Accordingly, the current project aimed to characterise temporal changes in gastrointestinal microbiota of beef cattle upon feedlot placement.
Methods: Faecal samples from 30 cattle were sampled upon feedlot induction (day 0), and then repeat sampling was carried out on days 2, 7 and 14. Lung scores were obtained on the last day of sampling (day 14) and subsequently
15 samples were chosen based on consistency of faecal samples across all four days of sampling, and lung scores obtained on day 14. Total DNA extracted from these faecal samples were subjected to 16s rDNA sequencing to determine the relative abundance of microbial species.
Results: Results indicate that feedlot transition significantly impact gastrointestinal microbiome profiles, particularly around 2 days after feedlot placement. On day 2, the proportion of key groups of bacteria previously associated with gastrointestinal diseases, like proteobacteria and actinobacteria, were significantly affected.
Conclusions: Overall, results suggest that gastrointestinal microbiota are significantly impacted due to feedlot placement of beef cattle, and their role in contributing to feedlot associated disease predisposition, including BRD, warrants
further investigated
Original languageEnglish
Number of pages1
Publication statusPublished - 21 Aug 2019
Event2019 Northern Beef Research Update Conference: Bush to bright lights - Brisbane Convention & Exhibition Centre, Brisbane, Australia
Duration: 19 Aug 201922 Aug 2019
https://researchoutput.csu.edu.au/admin/files/32129155/NBRUC_Conference_program.pdf (program and abstracts)


Conference2019 Northern Beef Research Update Conference
Abbreviated titleBeef Research
Internet address


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