Comparaison De l'ACTION De l'ACRYLATE De Sodium Et De La Chlortétracycline Sur La Flore Intestinale Du Porc

Abstract

Centre national de Recherches zootechniques, Jouy-en-Josas (Seine-et-Oise) SOMMAIRE i. In vilro l'acrylate de sodium, à la dose de 1 , 5 p. i ooo, inhibe sélectivement la croissance d'Escherichia coli dans la flore complexe de l'intestin du porc ; la croissance des lactobacilles n'est pas modifiée ; la chlortétracycline ( 20 mg/litre) modifie peu la répartition de ces deux espèces.2 . Le catabolisme azoté de la flore (mesuré par la dégradation de l'urée, de la L-arginine et de la L-lysine) est inhibé au même taux par l'acrylate et la chlortétracycline (environ go p.roo en 6 heures).3 . La dégradation des glucides par la flore, hétérofermentaire chez le témoin (formation de

The digestion of complex carbohydrates in the large intestine of the growing pig: effects on nitrogen metabolism

“…The addition of antibiotic (Table 8) of changes in the cecal environment as a result of the reduction in fermentation rate (Michel, 1965). A simi lar effect has been reported by , who showed a significant decrease in fecal VFA in pigs after the administration of neomycin.…”

“…The coefficients of apparent digestibilities for dry matter and cellulose are shown in rates the microbial origin of fiber digestion, as previously found jj: vivo (Friend ^ a2., 1963) and vitro (Michel, 1965). However, the experiment was not sensitive enough to show significance for the consequent changes in dry matter digestibility.…”

“…Microbial protein synthesis is mainly limited by the amount of fermentable energy reaching the large intestine, rather than by nitrogen which is usually present at levels more than adequate to sustain maximal microbial growth (Mason et al, 1977 Feeding high levels of nonabsorbable antibiotics does not completely eliminate intestinal bacteria, but it brings about a change in the microbial species present in the in testine and a reduction in intestinal fermentation (Kent et al, 1969). Consequently, the addition of antibiotics to the diet of nonruminants results in a decrease in starch and cellulose (Michel, 1965) di gestibilities and an increase in apparent N and amino acid digestibilities ) when compared to nontreated controls.…”

The digestion of complex carbohydrates in the large intestine of the growing pig: effects on nitrogen metabolism

“…The coefficients of apparent digestibilities for dry matter and cellulose are shown in as dietary cellulose increased. The addition of neomycin completely arrested the digestion of cellulose, which corrobo rates the microbial origin of fiber digestion, as previously found jj: vivo (Friend ^ a2., 1963) and vitro (Michel, 1965). However, the experiment was not sensitive enough to…”

“…Microbial protein synthesis is mainly limited by the amount of fermentable energy reaching the large intestine, rather than by nitrogen which is usually present at levels more than adequate to sustain maximal microbial growth (Mason et al, 1977 (Kent et al, 1969). Consequently, the addition of antibiotics to the diet of nonruminants results in a decrease in starch and cellulose (Michel, 1965) di gestibilities and an increase in apparent N and amino acid digestibilities ) when compared to nontreated controls.…”