Showing papers on "Mineral absorption published in 1986"
TL;DR: Although 25% of soy protein in the diet does not seem to impair mineral absorption significantly, small intestinal net absorption of nitrogen is less from the soy diets than from the meat diet.
Abstract: The apparent absorption of nitrogen and minerals was studied in 8 ileostomy subjects. Four different test diets containing 60 g of meat, rice and bread protein, or a 25% replacement of the protein with soy flour, soy concentrate or soy isolate, were randomly assigned to the subjects in 2-d periods. All animal protein was replaced by soy isolate for a fifth 2-d period in two of the subjects. Ileostomy contents were collected in 2-h intervals during the day and in one portion during night and immediately deep-frozen. The fiber components and the phytic acid in the diet were almost completely recovered in the ileostomy contents, whereas unabsorbed starch was less than 2% of the intake. A significantly lower protein digestibility was observed when the diets containing soy protein were fed. No difference in protein digestibility was found between the different soy protein products. A 25% replacement by soy protein had no obvious effect on apparent mineral absorption. A low protein digestibility was also observed when soy was the main source of protein, and a negative apparent absorption of zinc was found in both subjects. Although 25% of soy protein in the diet does not seem to impair mineral absorption significantly, small intestinal net absorption of nitrogen is less from the soy diets than from the meat diet.
41 citations
TL;DR: In the younger animals the decrease in femur Zn with fibre correlated with apparent Zn absorption and the age of the animals influenced the utilization of dietary minerals using femur concentration as a criterion, particularly in the case of Zn, while in the older animals, plasmaZn, albumin-bound plasma Zn and availability of plasma ZN for enzyme reactivation were lowest with the highest addition of wheat bran.
Abstract: 1 The present work was undertaken to study comparatively the effect on mineral availability in rats of wheat bran and barley husk when supplying the same amount of dietary fibre (DF) The experiment involved a total of nine dietary treatments including a control group and two series of four groups with increasing amounts of fibre from the two sources (total DF ranging from 42 to 117 g/kg dry matter (DM] Dietary nitrogen concentration was kept constant at 15 g N/kg DM Zinc concentration of the diets was adjusted to the level provided by the diet with the highest wheat-bran content (21 mg/kg DM) using zinc sulphate Other minerals were not adjusted 2 Two experiments were performed In Expt 1 the diets were given to 5-week-old rats during 9 d and apparent absorptions of Zn, calcium and phosphorus and the femur concentrations of Zn, Ca and P were measured In Expt 2 the diets were given to 9-week-old rats during 12 d Mineral concentration in femur and total and albumin-bound plasma Zn and availability of plasma Zn for enzyme reactivation were measured 3 In the younger animals, wheat bran depressed significantly the absorption of Zn when providing 40 g DF/kg DM and absorbtion of Ca when providing 80 g DF/kg DM Barley husk depressed significantly both the absorption of Zn and Ca already at 20 g DF/kg DM Both fibre sources had a more negative effect on Zn than on Ca absorption Only barley husk had a small negative effect on absorption of P Phytate did not appear as a major factor affecting mineral absorption in barley husk All diets containing barley husk had a very low molar ratio, phytate:Zn 4 The age of the animals influenced the utilization of dietary minerals using femur concentration as a criterion, particularly in the case of Zn In the younger animals the decrease in femur Zn with fibre correlated with apparent Zn absorption both with wheat bran (R2 0986, P less than 001) and with barley husk (R2 0996, P less than 001) In the older animals femur Zn did not change significantly with fibre 5 In the older animals, plasma Zn, albumin-bound plasma Zn and availability of plasma Zn for enzyme reactivation were lowest with the highest addition of wheat bran
30 citations
TL;DR: To elucidate the role of bacterial fermentation, the effects of amylomaize starch were compared in germfree (GF) and conventional rats and mineral retention was similar in GF rats fed ad libitum, but was reduced in pair-fed rats.
Abstract: The effects of amylomaize starch on rat mineral metabolism were studied. To elucidate the role of bacterial fermentation, the effects of amylomaize starch were compared in germfree (GF) and conventional (CV) rats. A purified diet, sterilized by irradiation and containing either maize starch (M) or amylomaize starch (A), was fed to the rats. Feed intake was similar in all groups of rats except GF rats fed amylomaize starch ad libitum, whose feed intake was higher. One group of GF rats received amylomaize starch in restricted amounts (pair-fed rats). A balance study of energy, nitrogen and minerals (Ca, P, Mg, Na, K, Fe, Mn, Zn and Cu) was performed. Apparent absorption of Mg, P, Na, K and Zn (expressed as a percentage of the amount ingested) was lower in GF rats fed amylomaize starch than in GF rats fed maize starch. Since feed intake was higher in GF rats fed amylomaize starch ad libitum than in rats fed maize starch, mineral absorption (expressed in milligrams per day) was not reduced in rats fed ad libitum, whereas it was reduced in pair-fed rats. Mineral retention was similar in GF rats fed ad libitum, but was reduced in pair-fed rats. In CV rats fed amylomaize starch, cecal weight and cecal volatile fatty acids concentration were higher than those in CV rats fed maize starch. Apparent absorption of N and P was lower and that of Ca, Mg and Fe was higher in CV rats fed amylomaize starch than in rats fed maize starch.(ABSTRACT TRUNCATED AT 250 WORDS)
29 citations
TL;DR: Estimates of mineral exchange in various parts of the tract showed that the intestines play and important role in scavanging endogenously secreted minerals.
Abstract: This paper addresses the way which absorption of minerals relate to nutritional ecology and mineral conservation processes. A latin square designed experiment was used to assess the effects of diet on mineral (Ca, Mg, K, Na) absorption processes in reindeer (Rangifer tarandus L.). Three male calves were fed 3 different diets: concentrate with 25% grass meal (RF-71), lichens, and a mixed diet of lichens and RF-71. Two other male calves were fed the lichen or mixed diet, supplemented with 4 g Ca/day. Ca supplementation significantly increased fecal Ca excretion, reduced the excretion of K and Mg, but had no significant effect on Na excretion. Rates of intake and fecal exretion of Ca, Mg and K were highly correlated (P<0.001), while no correlations were found for Na. Negative digestibilities of Ca, Mg and K, and a positive Na digestibility were noted for the lichen diet. For the other diets, all minerals were in positive digestibility, and Ca supplements increased the digestibility of all minerals. Digesta from different sections of the alimentary tract were collected after termination of the experiment. Alimentary pools of Ca and K were equal for animals fed lichen or RF-71, whereas the Na pool was largest on the lichen diet and the Mg pool largest on the RF-71 diet. Rumen turnover time (rumen mineral pool size/daily mineral intake) was consistently less than 3 days for Ca and Mg, but was 22 and 82 days for Na on the RF-71 and lichen diets respectively. Estimates of mineral exchange in various parts of the tract showed that the intestines play and important role in scavanging endogenously secreted minerals. Results are discussed with respect to mineral binding by lichens and the possible role of natural mineral supplements in the nutritional ecology of reindeer.
17 citations
TL;DR: Four balance trials were conducted to determine the effect of dietary fiber (oat hulls or wheat bran) and salinomycin on mineral absorption and balance in growing pigs.
Abstract: Four balance trials were conducted to determine the effect of dietary fiber (oat hulls or wheat bran) and salinomycin on mineral absorption and balance in growing pigs. The experimental diets were a corn-soybean meal control diet (C), a diet containing 10% oat hulls (OH), a diet containing 20% wheat bran (WB), each with or without salinomycin (SM; 82 mg kg−1). The inclusion of OH decreased Ca (P < 0.06) and Zn (P < 0.01) balance, largely as a consequence of decreased fractional absorption (absorbed as a percentage of intake), and decreased (P < 0.10) P balance and efficiency of P retention (P < 0.04). OH did not influence Mg balance. WB did not affect Ca, Zn or P balance, but increased (P < 0.02) Mg balance, primarily due to an increase in Mg intake. Both OH and WB depressed absolute and fractional Na absorption (P < 0.01), with only nonsignificant reductions in Na balance. OH depressed K absorption (P < 0.01), but apparent K absorption was slightly increased (P < 0.08) by WB due to a greater K intake. Ne...
16 citations