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See detailEffet de l’ammoniac sur la fibre C impliquée dans le réflexe de la toux chez le porc
Moreaux, B.; Nemmar, R.; Gustin, Pascal ULg

in Journées de la Recherche Porcine en France (2000), 32

The effect of ammonia on the C-fibre which is involved in the citric acid induced coughing reflex was assessed. The piglets were exposed during a period of 24 hours or 4 days to a concentration of 15 or ... [more ▼]

The effect of ammonia on the C-fibre which is involved in the citric acid induced coughing reflex was assessed. The piglets were exposed during a period of 24 hours or 4 days to a concentration of 15 or 30 ppm ammonia in an inhalation chamber . During this challenge, the animais underwent cough induction tests at two days intervals. Another group was exposed to ammonia (30 ppm) for 48 hours, after this period, substance P was assayed in liquids collected from broncho-alvealor and tracheal washings (BAL and TAL) and in tracheal and airway mucosa . Ammonia (30 ppm) induced an inhibition 0f the coughing reflex in pigs. The minimum period of exposure necessary to provoke this effect was 48 hours. The same ammonia concentration aiso induced o significant increase in substance P concentrations in BAL and TAL and a significant decrease in concentrations of the tracheal mucosa. We conclude that ammonia at o concentration of 30 ppm inhibits the citric acid induced coughing reflex. The effect was partly mediated by the release of substance P from the C-fibre. [less ▲]

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See detailEffet des protéines et des fibres alimentaires sur les pertes iléales d'acides aminés endogènes chez le porc.
Leterme, Pascal; Rossi, Florence; Thewis, André ULg

in Journées de la Recherche Porcine en France (1997), 29

An N-free diet was supplemented with limited but increasing amounts of proteins (30, 60, 90 g/kg diet from a mixture of casein and egg yolk), in order to measure their effect on the ileal endogenous amino ... [more ▼]

An N-free diet was supplemented with limited but increasing amounts of proteins (30, 60, 90 g/kg diet from a mixture of casein and egg yolk), in order to measure their effect on the ileal endogenous amino acid (AA) losses in pigs. The study was conducted at 2 dietary fibre levels: 20 and 80 g/kg, isolated from pea seeds. Compared to the N-free diet, a supply of 30 g proteins was sufficient to obtain a positive N retention and the following supplies allowed a constant and linear increase (0.88 g N retained/g N intake). The same supply induced an increase in ileal endogenous losses, compared to the control (10.7 vs 7.2 g AA/kg DMi for the low fibre diet) but the difference was not significant because of a high variability between the pigs. The supplies of 60 and 90 g proteins did not modify the level of the losses either: 10.2 and 10.6 g AA/kg DMi, respectively. The same trends were observed for the diets with a high fibre level but, in this case, the losses were significantly higher: respectively 14.9, 16.7, 15.7 and 17 g AA/kg DMi. On the other hand, the fraction of the digesta containing the free AA and the small peptides (< 3 kDa), supposed to be mainly of dietary origin, remained independent of the protein level. This suggests a virtually complete digestibility of the dietary proteins. Thus, pea fibres induce a significant increase of the ileal endogenous losses but without disturbing the protein digestion process, as suggested by the N retention. The protein supply probably increased the digestive secretions but the latter could have been highly reabsorbed, due to a lack in dietary factors susceptible to increase the reabsorption. [less ▲]

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See detailLes pertes iléales azotées endogénes chez le porc: effet de la composition, de la mouture et du taux d'incorporation des fibres internes de la graine de pois dans les aliments.
Leterme, Pascal; Froidmont, Eric; Thewis, André ULg

in Journées de la Recherche Porcine en France (1996, February), 28

The effect of the chemical composition, the grinding or the dietary level of the pea grain inner fibres on the ileal endogenous nitrogen losses in pigs was studied in three experiments. The intake of ... [more ▼]

The effect of the chemical composition, the grinding or the dietary level of the pea grain inner fibres on the ileal endogenous nitrogen losses in pigs was studied in three experiments. The intake of wrinkled pea inner fibres and starch slightly increased the ileal endogenous amino acid losses compared to smooth peas. The addition of micronized fibres (< 50 μm) in N-free diets significantly decreased the endogenous losses compared to untreated fibres. The water-holding capacity of the latter was higher than that of the micronized fibres (13 vs 4 g water/kg DM). The addition of increasing levels of fibres in diets (5, 10, 15, 20 % raw fibres, i.e. 2.5, 5.0, 7.5, 10 % AOAC fibres) proportionally increased the endogenous losses. The flow of total amino acids estimated for a diet free of fibres reached 6.47 g/kg DM intake and each gramme of AOAC fibre added per kg diet increased the total endogenous amino acid losses of 0.04 g. [less ▲]

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