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In a model experiment, Holstein-Friesian dairy cows were fed on a cornsilage-based diet supplemented with 11.75 MJ NE l per day of calcium soaps of palm oil fatty acids (CAS) or hydrogenated triglyceride (HTG) or without fat supplementation (control). All diets were fed to the cows over a period from 21 ± 3 days (d) prior to the expected calving to d 100 ± 5 postpartum. On d 25 (basal sample) and d 14 prepartum as well as on d 5 and 25 postpartum liver samples were collected by percutaneous biopsy. Total lipid content, fatty acid composition and glycogen of liver tissues were determined. At d 5 postpartum, both control and CAS cows had higher liver lipid (P < 0.05) and lower glycogen (P < 0.05) concentrations than cows in the HTG group. No significant (P < 0.05) differences were detected in liver fat content among the groups at d 14 prepartum or d 25 postpartum. The glycogen concentration slightly decreased in the liver of cows in each treatment group from d 14 prepartum to d 5 postpartum; however, this decrease was more intensive in both the control and CAS groups than in the HTG group. The variations in liver lipid concentrations were accompanied by significant changes in the proportion of C16:0, C16:1n-7, C18:0, C18:1n-9, C18:2n-6 and C20:4n-6 fatty acids in the liver lipids. The results show that HTG supplementation exerted more advantageous effects on liver lipid and glycogen metabolism than did CAS supplementation.

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Abstract  

Tissues, eggs and bile of adult Atlantic cod raised in captivity and fed natural food with no additional halogenated compounds of any kind were analyzed by neutron activation. There was a large difference in the tissue distributions of extractable organic chlorine (EOCl) and bromine (EOBr). Liver lipid had the lowest levels of EOBr and EOCl, of all the components investigated, and eggs had the highest levels of EOCl. Heart contained the most EOBr and EOCl per unit lipid, of the tissues. The presence of a larger proportion of EOBr than EOCl in bile suggests a higher rate of excretion of EOBr. The EOCl concentratios found in cod egg lipids were about 5 times higher than the highest values previously reported for EOCl in lipid.

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Acta Veterinaria Hungarica
Authors:
Tibor Gaál
,
L. Wágner
,
F. Husvéth
,
H. A. Manilla
,
P. Vajdovich
,
N. Balogh
,
I. Lóth
, and
Katalin Németh S.

The influence of fish oil (highly unsaturated) and beef tallow (highly saturated) with vitamin E (100 IU/kg) supplementation on the antioxidant status of broiler chicken cockerels was investigated. Chicks were fed a control diet with no added fat, 40 g/kg each of fish oil and beef tallow diets, respectively, from 11 to 42 days of age. Tocopherol concentration and the rate of lipid peroxidation, thiobarbituric acid reactive substance (TBARS) in liver, fatty acid composition of the liver lipids, blood serum total antioxidant status (TAS), and reduced glutathione (GSH) content were determined. Vitamin E supplementation of the diet increased liver ?-tocopherol content in chicks regardless of the type of dietary fat. Fish oil diet resulted in higher liver TBARS value while beef tallow diet showed lower values compared to the control diet. Vitamin E supplementation reduced liver TBARS as well as serum GSH, and raised serum TAS for all diets. Serum GSH was the same for vitamin E supplemented diets regardless of the fat supplement. Fish oil diets resulted in a significant increase in hepatic lipid n-3 PUFA content. A significant positive correlation was found between liver TBARS and n-3 PUFA content. No relationships were established, however, between liver TBARS and n-6 PUFA or saturated fatty acids. The results suggest that feeding oils rich in n-3 PUFA increases tissue concentration of these fatty acids, consequently increasing tissue lipid peroxidation and reducing the antioxidative status of broiler chickens. Supplementing high levels of vitamin E with such oils may increase tissue oxidative stability. Serum TAS or GSH may be used as a measure of antioxidative status in chickens.

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. Heo Y. J. Lee 2004 Amaranth squalene reduces serum and liver lipid levels in rats fed a cholesterol diet Br. J. Biomed. Sci. 61 11 – 14 . [16]. O. P. Yelisyeyeva D. V. Kaminskyy A. P. Cherkas 2006 Characteristics of

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is a phytoestrogen source [ 23 ]. Phytoestrogens are non-steroidal plant-derived compounds with biological activity similar to estrogen [ 24 ]. Phytoestrogens increase liver lipid biosynthesis from glucose [ 25 ]. Alfalfa consists of saponins

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Acta Veterinaria Hungarica
Authors:
József Szabó
,
Gergely Maróti
,
Norbert Solymosi
,
Emese Andrásofszky
,
Tamás Tuboly
,
András Bersényi
,
Geza Bruckner
, and
István Hullár

liver protein is almost completely inhibited ( Mäenpää et al., 1968 ). The inhibition of lipid oxidation and of apoprotein synthesis, necessary for the lipid export, may result in liver lipid accumulation. Excess fructose consumption also affects extra

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