Transport sanguin et métabolisme hépatique des acides gras chez le ruminant

in Annales de Médecine Vétérinaire (2005), 149

Blood transport and hepatic metabolism of fatty acids in ruminants present several particularities. The plasma profile is characterized by a very small proportion of triacylglycerols-rich lipoproteins— ... [more ▼]

Blood transport and hepatic metabolism of fatty acids in ruminants present several particularities. The plasma profile is characterized by a very small proportion of triacylglycerols-rich lipoproteins— chylomicrons and very low density lipoproteins — and a very high proportion of high density lipoproteins, which can reach 80 % of the total lipoproteins. This distribution is concomitant with a low triacylglycerol and non esterified fatty acids plasma content, but with very high esterified cholesterol and phospholipid contents. Futhermore, the ruminant is characterized by the secretion of the majority of very low density lipoproteins at intestinal level and by a very low hepatic capacity to export triacylglycerols in these lipoproteins ; ruminant is therefore more sensible to steatosis. Moreover, the intrahepatic lipogenesis of ruminant is reduced, with as results a dependence on fatty acids blood import, the fatty acids being then directed to one of the two major pathways of intrahepatic metabolism, oxidation or esterification into triacylglycerols. [less ▲]

Acides gras et métabolisme énergétique des muscles squelettiques chez le bovin

in Annales de Médecine Vétérinaire (2005), 149(4), 188-201

Energy metabolism of skeletal muscles in cattle is characterized by several specificities, mostly related to particularities of the digestive physiology. Energy metabolism of muscles relies on ... [more ▼]

Energy metabolism of skeletal muscles in cattle is characterized by several specificities, mostly related to particularities of the digestive physiology. Energy metabolism of muscles relies on preferential utilization of some nutrients, such as volatile fatty acids and ketone bodies on the one hand, and glucose on the other hand, the contribution of non-esterified long chain fatty acids being limited. As for other species, nutrients utilization is influenced by the nature of muscle fibers, leading to preferential metabolic pathways. Energy metabolism can be either more oxidative, oxido-glycolytic, or glycolytic. Close relationships are found between energy metabolism, chemical composition of muscle - more particularly its fat level - and organoleptic quality of meat. [less ▲]

Variation of plasma parameters and nitrogen metabolism in finishing Belgian blue double-muscled cull females.

in Journal of Animal Physiology & Animal Nutrition (2005), 89(1-2), 55-62

The changes over time in plasma parameters and nitrogen metabolism were studied in finishing Belgian Blue double-muscled females offered a maize silage based diet. When compared with literature data ... [more ▼]

The changes over time in plasma parameters and nitrogen metabolism were studied in finishing Belgian Blue double-muscled females offered a maize silage based diet. When compared with literature data, plasma glucose along with triglycerides concentrations was low while non-esterifled fatty acids were high and rich in polyunsaturated forms. The concentrations in thyroid hormones, insulin-like growth factor 1 and insulin were also low and plasma insulin decreased with time. Growth hormone concentration, by contrast, increased with time. On average, the females retained 44 g nitrogen per day from an intake of 210 g but the efficiency of retention decreased with time. The fractional rates of accretion and synthesis of muscle protein were also affected by time. The dry matter content in muscle biopsies was close to 22% and increased with the finishing, as did the diameter of the tailhead adipocytes. [less ▲]

Comparaison of a pulp-based diet and a cereal-based diet in the fattening of young bulls from Belgian Blue, Limousin and Aberdeen Angus breeds

in Proceedings of the British Society of Animal Science (2005)

Nitrogen balance and soil nitrates in suckler cow pastures feriliser with mineral fertiliser, pig slurry or catle compost

in XX International Grassland Congress: offered papers (2005)

Selenium and blood antioxydant markers in two groups of suckling cows offered grass silage, maize silage and barely grown with fertilizer containing or not selenium

in 9th Congress of the European Society of Veterinary and Comparative Nutrition (2005)

Influence of breed, diet and muscle on the fatty acid content in meat from young finished bulls

in Indicators of milk and beef quality (2005)

Adipocyte fatty acid-binding protein expression and mitochondrial activity as indicators of intramuscular fat content in young bulls

in Indicators of milk and beef quality (2005)

Blanc Bleu culard : un bovin économiquement intéressant qui produit une viande savoureuse. Etude comparative sur l'engraissement et la qualité de la viande de taurillons Blanc Bleu Belge, Limousin et Aberdeen Angus.

Report (2004)

Suppléments nutritionnels visant à améliorer la santé de la vache laitière : problématiques des fièvres de lait et des pathologies infectieuses en période de gestation-tarissement. 2004

Report (2004)