ABSTRACT
To study the effects of nano elemental selenium (Nano-Se) or sodium selenite (Na2SeO3) on the activities of glutathione peroxidase (GSH-Px) and Type-I deiodinase in the liver. A total of 234 weanling pigs (Duroc x Landrace x Yorkshire) at an average initial body weight of 8.3 kg were allocated to 13 treatments. The thirteen dietary treatments were basal diet only (containing 0.04 mg/kg Se), basal diet + 0.1, 0.2, 0.3, 0.4, 0.5, 1.0 mg/kg Se as Na2SeO3 or Nano-Se, respectively. The results were as follows: Supplementation with 1.0 mg/ kg Se as Na2SeO3 reduced (P < 0.05) growth performance and GSH-Px activities as compared with the addition of a concentration range of 0.20-0.40 mg/kg Se. When Nano-Se was added to the diet, the growth and GSH-Px activities remained steady at the peak value as at a concentration of 1.0 mg/kg Se; There were no difference in the activities of GSH-Px between the treatments of Nano-Se and Na2SeO3 when added concentration of Se was 0.10-0.40 mg/kg. The pigs had higher (P < 0.05) activities of GSH-Px at a concentration range of 0.50 and 1.0 mg/kg as Nano-Se than Na2SeO3; Supplentation with Se increased the activity of Type- I deiodinase in liver, however, the increased extent was affected by neither Se sources nor added concentration of Se. The results implicated that for the best concentration range of Weinberg curve, Nano-Se is wider than Na2SeO3.
Subject(s)
Animals , Dose-Response Relationship, Drug , Glutathione Peroxidase , Metabolism , Iodide Peroxidase , Metabolism , Liver , Metal Nanoparticles , Selenium , Pharmacology , Sodium Selenite , Pharmacology , SwineABSTRACT
Nanotechnology is the technique that is used in manufacturing special function products with the studies of movement regularities and properties for electrons, atoms and molecules within 1-100 nm. It is penetrating into the fields of biology and medicine. Because nanoparticles possess quantum size effect, surface little size effect and grand quantum tunnel effect, they exhibit many characteristics such as great specific surface area, high surface activity, a lot of surface active centers, high catalytic efficiency and strong adsorbing ability. The development of biology and medicine will be speeded up with the progress of nanotechnology and the understanding of nanoparticles.
Subject(s)
Humans , Biomedical Technology , Medicine , Nanotechnology , Nanotubes , Chemistry , Particle SizeABSTRACT
Objective: 780 Linen yellow broiler chicken, 1 d of age, were used to investigate the effects of nano elemental selenium (Nano-Se) or Na2SeO3 on growth performance and antioxidant function. Method:The chicken were allocated to 13 treatments, each of which had 4 pens of 15 chicks per pen. The thirteen dietary treatments were basal diet only,and basal diet + 0.1、0.2、0.3、0.4、0.5、1.0 mg/kg Se as Na2SeO3 or Nano-Se, respectively. Results:(1) The growth performance of chicken remained steady at the peak value at concentration range of 0.2-0.5 mg/kg for Na2SeO3. Supplementation with 1.0 mg/kg Se as Na2SeO3 reduced (P
ABSTRACT
Objective: To study the effects of dietary sodium propionate on cholesterol metabolism in finishing pigs. Methods: A total of 96 finishing pigs (Duroc?Landrance?Jia) were randomly alotted to four groups. The groups received the same basal corn-soybean meal diet and sodium propionate was added to the basal diet in the concentrations of 0.5、1.0、1.5 % at the expense of corn, respectively. At the end of the feeding trial, eight pigs from each treatment were slaughtered. Results: (1) Pigs supplemented with 1.0% and 1.5% sodium propionate had significantly lower serum cholesterol and low density lipoprotein cholesterol concentrations and greater ratios of high density lipoprotein/low density lipoprotein cholesterol compared to the control. Pigs supplemented with 1.5% sodium propionate had significantly lower serum very low density lipoprotein cholesterol. (2) Supplementation with 1.0% and 1.5% sodium propionate significantly decreased the cholesterol content in liver and the activity of hepatic 3-hydroxy-3-methylglutary coenzyme A (HMG-CoA) reductase. (3) Supplementation with sodium propionate had no significant effects on growth performance, colonic or serum short-chain acid concentrations, fecal cholesterol or bile acid excretion. Conclusion: Sodium propionate may decrease the activity of hepatic HMG-CoA reductase and suppress the synthesis of cholesterol.
ABSTRACT
Objective: To study the effects of dietary fructooligosaccharide (FOS) on cholesterol metabolism in finishing pigs. Methods: A total of 96 finishing pigs (Duroc?Landrance?Jia) were randomly alotted to four groups each of which was replicated three times with eight pigs per replicate. The groups received the same basal corn-soybean meal diet and FOS was added to the basal diet at 0,0.5%,1 0%,1.5% at the expense of corn, respectively. At the end of the feeding trial, eight pigs with similar body weights from each treatment were slaughtered. Results: (1) Supplementation with FOS significantly improved average daily gain and feed efficiency. (2) Pigs fed 1.0% and 1.5% FOS had significantly lower serum TC and LDL-C concentrations and greater HDL-C/LDL-C ratio compared with the control. Pigs fed 1.5% FOS had significantly lower serum VLDL-C and ApoB concentrations and Apo B/Apo A-1 ratio. (3) Supplementation with 1.0% and 1.5% FOS significantly decreased the activities of HMG-CoA reductase. (4) Supplementation with 1.5% FOS significantly increased the colonic acetate and butyrate and plasma acetate. Supplementation with 0.5%,1.0% and 1.5% FOS significantly increased colonic propionate. (5) Fecal cholesterol excretion was significantly greater in the pigs fed 1.0% and 1.5% FOS and fecal bile acid excretion was significantly greater in the pigs fed 1.5% FOS than the control. Conclusion: FOS may improve cholesterol metabolism by alteration in the absorption and synthesis of cholesterol resulted from the changes in colonic fermentation, and by increase in the fecal excretion of cholesterol and bile acid.