The impact of short-term acute heat stress on the rumen microbiome of Hanwoo steers
Heat stress negatively affects cattle productivity by reducing feed intake. In the present study, we assessed if the rumen microbiome composition of Hanwoo steers was altered by exposure to heat stress. Rumen samples were collected from fou...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Korean Society of Animal Sciences and Technology
2020-03-01
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| Series: | Journal of Animal Science and Technology |
| Subjects: | |
| Online Access: | http://www.ejast.org/archive/view_article?pid=jast-62-2-208 |
| Summary: | Heat stress negatively affects cattle productivity by reducing feed intake. In
the present study, we assessed if the rumen microbiome composition of Hanwoo
steers was altered by exposure to heat stress. Rumen samples were collected from
four Hanwoo steers that were individually housed in climate-controlled chambers
with 60% humidity and environmental temperatures of: 1) 15°C (0-day
group), 2) 35°C for 3 days (3-day group), and 3) 35°C for 6 days
(6-day group). The total community DNA of samples was extracted, and 997,843
bacterial and 1,508,770 archaeal sequences were analyzed using next-generation
sequencing. Assessment of the relative abundances revealed 15 major phyla of
which Bacteroidetes was found to be the most dominant. After 3 days of heat
stress exposure there were no significant changes in the rumen microbiome
composition, except for a decrease in the Planctomycetes. However, after 6 days
of heat stress exposure, we found that the relative abundance of fibrolytic
Ruminococcaceae had decreased while that of lactate-producing Lactobacillaceae
and amylolytic Prevotella and Ruminobacter had
increased. The normal rumen microbiome of Hanwoo cattle was shown to be
disrupted after 6 days of heat stress, which led to the decrease in fibrolytic
bacteria that are sensitive to low pH and the increase in both lactate-producing
and amylolytic bacteria. We have demonstrated that the microbiome composition of
the rumen is affected by acute heat stress. Our findings may contribute to the
development of different feeding strategies to restore heat stress-induced
disruption of the rumen microbiome. |
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| ISSN: | 2672-0191 2055-0391 |