25 Aug 2022

Dietary fat and its influence on rumen microbiota. Part II

Fat supplementation as a means to increase dietary energy values and meet energy requirements in dairy cows and fattening cattle has become a common practice in intensive production systems. This type of supplements can also be used to modify the fatty acid profiles of products such as meat and milk.

Dietary fat and its influence on rumen microbiota. Part II

Dietary fat and its influence on rumen microbiota.

This second entry, analyzes the results obtained by researchers in the in vivo trials previously mentioned. As well as delving in fat biohydrogenation with greater depth. A process that follows after lipolysis once fats are within the rumen, as it was previously described in the first entry.

 

Detoxifying adaptation-biohydrogenation

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This process is considered as a detoxifying adaptation (Kemp et al. , 1984), and marginally contributes to the elimination of reducing equivalents produced by rumen fermentation (Lourenço, et al. 2010).

Biohydrogenation (BH) comprises several steps, depending on the USAFs, as well as several pathways, depending on diet and rumen environment (Griinari et al., 1998).

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Protozoa encompass bacteria, and bacterial biohydrogenation can take place within protozoa (Jenkins et al., 2008) which explains their high concentrations of intermediate products (Devillard et al. , 2006).

In Vivo Studies

Beyond studies based on the selected isolates, in vivo trials have been carried out to evaluate the relationship between rumen bacteria and biohydrogenation. This has been done by  adding bacteria and quantifying their products, or by adding dietary supplements known to affect BH and measuring bacterial abundance.

As a rule

Other observations ….

Observations on archaeal community

Dietary fat

Methanobrevibacter ruminantium

Studies with pure strains of archaea adding organic acids or saturated fatty acids evidenced an inhibition of methane production by Methanobrevibacter ruminantium.

About linoleic acid ….

Dietary fat




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