Tag Archives: dry matter

662-667 D. Matt, E. Veromann and A. Luik
Effect of housing systems on biochemical composition of chicken eggs
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Effect of housing systems on biochemical composition of chicken eggs

D. Matt, E. Veromann and A. Luik

Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences,Kreutzwaldi 1, EE51014 Tartu, Estonia; tel: +372 7425 010; e-mail: darja.matt@emu.ee

Abstract:

The aim of this study was to investigate the impact of production system (organic, conventional) on the quality of chicken eggs. Energetic value, carbohydrate, cholesterol, protein, fatty acid, sodium, potassium, phosphorus, dry matter and vitamin contents were evaluated. The mean content of cholesterol was 30%, and potassium 7%, greater in the organic eggs compared with the conventional eggs. No significant difference was found in the content of fatty acids, protein, sodium or dry matter. The organic eggs had considerably lower contents of calcium (2.8 times) compared with eggs from conventional farming. Negligible differences were found in the occurrence of vitamins (vitamin A, vitamin E, vitamin D3). The residues of 45 pesticides and 6 PCB isomers were analyzed in both types of eggs and no residues compounds were found.

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489-498 Z. Kriauciuniene, R. Velicka, S. Raudonius and M. Rimkeviciene
Changes of lignin concentration and C:N in oilseed rape, wheat and clover residues during their decomposition in the soil
Abstract |

Changes of lignin concentration and C:N in oilseed rape, wheat and clover residues during their decomposition in the soil

Z. Kriauciuniene², R. Velicka¹, S. Raudonius¹ and M. Rimkeviciene²

¹Department of Soil Management, Lithuanian University of Agriculture, Studentu 11,Akademija, LT-53361 Kaunas dist., Lithuania, e-mail: rimantas.velicka@lzuu.lt
²Experimental Station of Lithuanian University of Agriculture, Noreikiskės,LT-53363 Kaunas dist., Lithuania, e-mail: zita.kriauciuniene@lzuu.lt

Abstract:

Field experiments were conducted in 2003–2005 at the Experimental Station of the Lithuanian University of Agriculture to study the changes of lignin concentration and C:N in roots and top residues of winter and spring oilseed rape (Brassica napus L.), winter wheat (Triticum aestivum L.) and red clover (Trifolium pratense L.) after 14, 33, 63, 85 and 116 weeks of decomposition in the soil. Correlation between lignin concentration and amount of dry matter as well as the ratio of carbon and nitrogen in investigated crop residues were estimated.Investigation of crop residue decomposition during the period of 116 weeks showed thatstubble and roots of winter and spring oilseed rape decompose more slowly than their threshing remains, or stubble, and roots of winter wheat and red clover. Dry matter and lignin decomposed and the ratio of carbon and nitrogen in winter oilseed rape residues decreased more slowly than that of spring oilseed rape residues.The ratio of carbon and nitrogen in the decomposing crop residues decreased mostintensively during the 33–63 week period. After that, the concentration of lignin started to decrease, but its significant decline in all investigated crop residues was estimated after 116 weeks of decomposition. Lignin was most decomposed from its concentration peak in the stubble of red clover (37.9%) and least in winter oilseed rape roots (12.8%).Negative correlation between lignin concentration and dry matter amount and betweenlignin concentration and C:N was established in winter and spring oilseed rape, winter wheat and red clover top and root residues decomposing in the soil.

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