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Predicting residual feed intake status using rumen microbial profiles in ewe lambs1
Melinda J Ellison1, Gavin C Conant2, William R Lamberson3
1Department of Animal and Veterinary Science, Nancy M. Cummings Research, Extension, and Education Center, University of Idaho, Carmen 83462.
Rumen microbial profiles can predict sheep feed efficiency. A specific profile of six microbial species accurately identified sheep feed efficiency status and correlated strongly with actual values, offering a new selection tool.
Area of Science:
- Animal Science
- Microbiology
- Genetics
Background:
- Feed efficiency is crucial for sheep industry profitability, impacting feed costs and stocking rates.
- Predicting feed efficiency using biological markers could enhance selection accuracy and producer profitability.
Purpose of the Study:
- To determine if rumen microbial profiles can predict feed efficiency status in sheep.
- To identify specific microbial species associated with divergent feed efficiency.
Main Methods:
- Two sheep populations were evaluated for feed efficiency on a standardized diet.
- Rumen fluid samples were analyzed using DNA sequencing to create microbial profiles.
- Discriminant and regression analyses were used to correlate microbial profiles with feed efficiency.
Main Results:
- A specific profile of 6 rumen microbial species accurately predicted feed efficiency status in a testing population (P < 0.001).
- The microbial profile showed a strong correlation with actual feed efficiency values (r = 0.71; P < 0.001).
Conclusions:
- Specific rumen microbial species are associated with feed efficiency in sheep.
- Rumen microbial profiling offers a potential method for ranking sheep for feed efficiency in breeding programs.
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