NM3RE3TQ

3233

1 mars 2021 22:02

12 avril 2021 16:15

The goal of the present study was to understand the transformations of the long-chain fatty acids found in pasture and feedlot diets that occur as fatty acids are processed by microbes in the rumen of cattle, through transport in blood plasma and during deposition in a subcutaneous fat depot. The impacts of diet on the rumen bacterial microbiome and the short-chain fatty acids these microbes synthesize from feed carbohydrates was also assessed. In the present study, short-chain fatty acids in the rumen and the rumen microbome, and long-chain fatty acids in the diet, blood plasma and subcutaneous fat were compared for a tannin-containing (birdsfoot trefoil) and a non-tannin legume (cicer milkvetch) pasture, a grass (meadow bromegrass) pasture, and a feedlot (concentrate) diet. The study demonstrated that rumen microbial diversity was reduced by feedlot diets compared with all three pasture diets. The rumen bacterial phylum Tenericutes was highly correlated with the rumen concentration of acetate. The ratio of acetic to propionic acid was greater in the rumens of cattle grazing grass than birdsfoot trefoil pasture, and The goal of the present study was to understand the transformations of the long-chain fatty acids found in pasture and feedlot diets that occur as fatty acids are processed by microbes in the rumen of cattle, through transport in blood plasma and during deposition in a subcutaneous fat depot. The impacts of diet on the rumen bacterial microbiome and the short-chain fatty acids these microbes synthesize from feed carbohydrates was also assessed. In the present study, short-chain fatty acids in the rumen and the rumen microbome, and long-chain fatty acids in the diet, blood plasma and subcutaneous fat were compared for a tannin-containing (birdsfoot trefoil) and a non-tannin legume (cicer milkvetch) pasture, a grass (meadow bromegrass) pasture, and a feedlot (concentrate) diet. The study demonstrated that rumen microbial diversity was reduced by feedlot diets compared with all three pasture diets. The rumen bacterial phylum Tenericutes was highly correlated with the rumen concentration of acetate. The ratio of acetic to propionic acid was greater in the rumens of cattle grazing grass than birdsfoot trefoil pasture, andThe goal of the present study was to understand the transformations of the long-chain fatty acids found in pasture and feedlot diets that occur as fatty acids are processed by microbes in the rumen of cattle, through transport in blood plasma and during deposition in a subcutaneous fat depot. The impacts of diet on the rumen bacterial microbiome and the short-chain fatty acids these microbes synthesize from feed carbohydrates was also assessed. In the present study, short-chain fatty acids in the rumen and the rumen microbome, and long-chain fatty acids in the diet, blood plasma and subcutaneous fat were compared for a tannin-containing (birdsfoot trefoil) and a non-tannin legume (cicer milkvetch) pasture, a grass (meadow bromegrass) pasture, and a feedlot (concentrate) diet. The study demonstrated that rumen microbial diversity was reduced by feedlot diets compared with all three pasture diets. The rumen bacterial phylum Tenericutes was highly correlated with the rumen concentration of acetate. The ratio of acetic to propionic acid was greater in the rumens of cattle grazing grass than birdsfoot trefoil pasture, and least in the rumen of feedlot cattle. Feedlot diets contained a much higher ratio of omega-6 to omega-3 fatty acids than all pasture diets, but concentrations of long-chain fatty acids in blood plasma suggest these differences were reduced by rumen biohydrogenation of alpha-linolenic acid. In blood plasma, cattle fed concentrates and birdsfoot trefoil had more omega-6 fatty acid than cattle fed cicer milkvetch, and cattle fed both cicer milkvetch and birdsfoot trefoil had more blood omega-6 fatty acid than grass-fed cattle. Plasma of cattle grazing birdsfoot trefoil had more omega-3 fatty acid than the other pasture diets, and blood of all pasture-fed cattle had more omega-3 fatty acid than feedlot-fed cattle. We concluded that even a relatively low concentration of tannin in the birdsfoot trefoil diet may have provided some protection to the unsaturated fatty acids in birdsfoot trefoil, inhibiting rumen biohydrogenation. Another aspect of this master’s study was to demonstrate the effective extension of data, such as the potential benefits of legume-finishing compared with grass- or concentrate-finishing, to the community of deaf agricultural producers.

None

• AB - Utile à l'AB
• FREDO santé animale
• GEO Etats-Unis
• élevage

2021

1 janvier 2021