Distribution des acides gras ds et trans dans les triglycerides de la lymphe de porc

Raulin, J; Loriette, CL; Flanzy, J.; Rérat, A.

doi:10.1016/0005-2760(66)90020-8

Cited by 6 publications

(2 citation statements)

References 5 publications

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“…Variations in the blood or lymph concentrations of a nutrient reflect the overall digestive processes to which the nutrient has been subjected, and its possible metabolisation in the gastrointestinal cell wall. A qualitative description of absorption can thus be made from the changes in intestinal lymph composition with time (lipids: [137]) or more generally from portoarterial differences in nutrient concentrations indicating the degree of enrichment of the portal blood draining the whole gut, relative to the afferent arterial blood of the intestine (minerals: [69,70]; amino acids issued from various proteins: [132,135,136]; sugars: [14-16, 149, 150]). A quantitative description of absorption can be made by measuring the blood flow rate in the portal vein (initially using an electromagnetic flowmeter) [140], while blood samples can be obtained by permanent catheterisations in the portal vein [3] and the carotid artery [141].…”

Section: A Methodology For the Assessment Of Absorptionmentioning

confidence: 99%

Forty years of achievement in french research on digestive physiology in the pig

Laplace¹,

Aumaı̂tre²,

Rérat³

2001

Reprod. Nutr. Dev.

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-The contribution of the research group set up by Rérat in the early 1960s in Jouy-en-Josas, and then expanded to Rennes, is summarised. As digestive processes are a major key to the nutritional status of monogastric animals, original methodologies based on advanced experimental surgery were developed in the pig to quantify the digestion and absorption yield, to know their factors of variation, and to understand their physiological and nutritional consequences. The group also extended its expertise to the control of food intake, the role of the nervous system and regulatory peptides, and several biomedical gut-related topics. pig / digestion / absorption / neurohumoral regulation / adaptationRésumé -Réalisations et succès de la recherche française : quarante ans de physiologie digestive chez le porc. Dès le début des années 60, un groupe de recherches a été constitué à l'initiative de A. Rérat à Jouy-en-Josas pour étudier divers aspects de la physiologie digestive chez le porc. Leur exploration a fourni des clés essentielles pour la maîtrise du statut nutritionnel chez cette espèce monogastrique, et un instrument d'amélioration de la production porcine. Ce groupe s'est élargi au fil des années et a même essaimé dans les années 80, notamment à Rennes. Il a apporté une contribution essentielle par le développement de méthodologies nouvelles généralement basées sur une chirurgie expérimentale très élaborée. Ces approches ont fourni de nombreux travaux originaux qui ont permis de décrire les processus de digestion (motricité, transit, sécrétions, hydrolyses enzymatiques

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Section: A Methodology For the Assessment Of Absorptionmentioning

confidence: 99%

Forty years of achievement in french research on digestive physiology in the pig

Laplace¹,

Aumaı̂tre²,

Rérat³

2001

Reprod. Nutr. Dev.

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show abstract

“…The significance and limits of this methodology have already been discussed (RCrat et al 1980). With regard to the principle of this method, it should be emphasized that the absorption of all nutrients taking the lymphatic route cannot be analysed; these nutrients are generally long-chain fatty acids (Raulin et al 1966) or protein fractions synthesized in the cell wall (Aliev, 1970). In addition, during its passage in the intestinal cell wall, the arterial blood may be depleted in nutrients taken up by the cells or be enriched in nutrients absorbed by the gut wall (a proportion may also be taken up by the cell wall during the transport).…”

Section: Methodsmentioning

confidence: 99%

Absorption kinetics of some carbohydrates in conscious pigs

1984

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1. Concentrations of reducing sugars, glucose, fructose and lactic acid in blood obtained from arterial and portal catheters were measured together with the portal hepatic blood flow-rate for periods of 8-24 h in twenty-six unanaesthetized pigs (mean body-weight 51 kg). The animals received experimental meals containing different amounts (100-1600 g) of different sugars (glucose fifteen meals, sucrose twenty-four meals, lactose fourteen meals, maize starch nineteen meals) together with a protein-mineral-vitamin mixture (1 50 g) 6-8 d after implantation of the catheters and an electromagnetic flow probe.2. Because the portal blood flow pattern did not differ between test meals, net absorption followed the same trends as for porto-arterial concentration differences (Rerat et al. 1984). Apart from lactose, the amounts of reducing sugars appearing in the portal vein correlated with the intake of the test meal, but the absorption pattern was different for each sugar. The appearance of reducing sugars was faster and earlier after intake of glucose than after sucrose and the same was the case for sucrose relative to maize starch. The differences between the three carbohydrates tended to increase with the level of intake.3. With a test meal containing 1 kg carbohydrate, i.e. a normal meal in a 50 kg pig, digestion of sucrose and maize starch was not finished 8 h after the meal since only 60 and 52% respectively of their hydrolysis products were recovered in the portal blood. In the case of lactose, the amounts of reducing sugars appearing in the portal blood were always very small and constant (I 13-1 18 g within 8 h) whatever the level of intake, i.e. 30 and 15%

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Effect of dietary fat supplementation on the composition and positional distribution of fatty acids in ruminant and porcine glycerides

Mills

Cook

Scott

et al. 1976

Lipids

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Dietary fats which were protected from ruminal metabolism were fed to ruminants, and the constituent fatty acids subsequently appeared in the glycerides of tissues and secretory products. These dietary fat induced alterations in tissue lipid composition were particularly apparent when the fat source was enriched with linoleic acid. Similarly, when pigs were fed linoleic-enriched fats, the linoleic acid was incorporated into the adipose tissue triglycerides. Stereospecific analyses were carried out on triglycerides from various tissues and secretory products obtained from animals fed control or linoleate-enriched diets. The analysis of adipose tissue triglycerides showed that linoleate and oleate were preferentially esterified to positions 2 and 3 (cattle and sheep), and positions 1 and 3 (pigs). Of the other major adipose tissue fatty acids, palmitate was preferentially esterified at position 1 (ruminants) and position 2 (pigs), and stearate was preferentially esterified at positions 1 and 3 (ruminants), and position 1 (pigs). Stereospecific analysis of high mol wt milk triglycerides showed that linoleate was either evenly distributed on all three positions (goats), or predominantly on position 3 (cows). Furthermore, the incorporation of this linoleate did not markedly alter the positional specificity of the other major milk triglyceride fatty acids. Of these fatty acids, the short and medium chain length acids (butyratelaurate) were mainly on position 3, myristate and palmitate on positions 1 and 2, and stearate and oleate evenly distributed. Thoracic duct lymph triglycerides from sheep tended to show preferential incorporation of linoleate at position 3, palmitate at position 2, and stearate at position 1 and 3; oleate, on the other hand, tended to be evenly distributed on all three positions of the lymph triglyceride. The stereospecific arrangement of fatty acids in sheep liver triglycerides was similar to that of lymph triglycerides, and this may reflect the uptake of intact or partially hydrolysed chylomicron and/or very low density lipoprotein triglycerides by the liver. There were also some analogies in the stereospecific arrangement of fatty acids on ruminant lymph and milk triglycerides and this may reflect an incomplete hydrolysis of chylomicron and/or very low density lipoprotein triglycerides prior to uptake by the mammary gland. An unusual feature of lymph from sheep fed linoleate was the presence of phospholipids which contained large amounts of linoleate in ca. equal proportion at both positions 1 and 2 of the phospholipid molecule.

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Distribution des acides gras ds et trans dans les triglycerides de la lymphe de porc

Cited by 6 publications

References 5 publications

Forty years of achievement in french research on digestive physiology in the pig

Forty years of achievement in french research on digestive physiology in the pig

Absorption kinetics of some carbohydrates in conscious pigs

Effect of dietary fat supplementation on the composition and positional distribution of fatty acids in ruminant and porcine glycerides

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