2022
DOI: 10.1071/an21508
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Rumen bacteria and feed efficiency of beef cattle fed diets with different protein content

Abstract: Context Beef cattle feed efficiency is challenged in northern Australian production systems due to the limited dietary protein, leading to changes in rumen bacterial populations and fermentation outcomes. Aims Two types of diets with different dietary protein contents were used to evaluate changes in rumen bacterial composition and diversity, aiming to correlate rumen bacterial populations with feed and rumen efficiency parameters. Methods In total, 90 Brahman steers (341 ± 45 kg BW) were selecte… Show more

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“…Moreover, even small differences in diets can promote differences or patterns of abundance in microbial taxa that could interfere with our understanding of microbial contributions to feed efficiency. For instance, Streptococcus in rumen fluid was correlated with RFI in 85 Braham steers on a low protein diet (8.8% crude protein) but not in a high protein diet (13.5% crude protein) [ 31 ], but this has not been investigated in epimural bacteria. This issue is not trivial since the choice of liquid samples responds to the ease and speed of taking samples and avoiding invasive fistulas.…”
Section: Discussionmentioning
confidence: 99%
“…Moreover, even small differences in diets can promote differences or patterns of abundance in microbial taxa that could interfere with our understanding of microbial contributions to feed efficiency. For instance, Streptococcus in rumen fluid was correlated with RFI in 85 Braham steers on a low protein diet (8.8% crude protein) but not in a high protein diet (13.5% crude protein) [ 31 ], but this has not been investigated in epimural bacteria. This issue is not trivial since the choice of liquid samples responds to the ease and speed of taking samples and avoiding invasive fistulas.…”
Section: Discussionmentioning
confidence: 99%
“…The higher levels of DM intake and ruminal NH 3 -N concentration of lambs fed the AF–SS silage-based diets with high AF ratio in the silage mixtures were expected. It was likely to be a result of being fed higher levels of dietary CP, which had a positive correlation with DM intake and rumen NH 3 -N concentration [ 28 ]. These results reflected that a greater proteolysis occurred during rumen fermentation of lambs fed AF–SS silage-based diets, as mixed silages contained a greater AF ratio.…”
Section: Discussionmentioning
confidence: 99%