Pannon University Georgikon

Keszthely, Hungary

Pannon University Georgikon

Keszthely, Hungary
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Molnar T.,University of Kaposvár | Kucska B.,Aquaculture and Irrigation Research Institute for Fisheries | Szabo A.,University of Kaposvár | Biro J.,University of Kaposvár | And 2 more authors.
Acta Alimentaria | Year: 2012

A feeding experiment was conducted on northern pike, Esox lucius L. (123.6±33.3 g initial body weight) applying graded dietary fish oil supplementation resulting three dietary fat levels (without supplementation: 6.2% fat and 11.7, 17.4% fat levels with supplementations) in a recirculation system. Feed consumption, feed efficiency and protein utilization of pike was not affected by the treatment. Whole body lipid content analysis showed that the composition of pike was significantly affected by the increasing level of fish oil supplementation, although no relationship was detected between the dietary and the fillet lipid content, as well as the protein content of fish bodies. High docosahexaenoic acid (DHA, C22:6n-3) proportions were found in the muscle lipids (groups fed fish oil supplementation), as compared to the dietary fatty acid compositions suggesting that with dietary fish oil supplementation the dietary precursors (mainly EPA) enable pike to convert long chain highly unsaturated fatty acids, especially DHA; resulting high DHA: EPA ratios in the fillet.


Bonis P.,Hungarian Academy of Sciences | Balazs F.,Pannon University Georgikon | Balazs J.,Pannon University Georgikon | Kismanyoky T.,Pannon University Georgikon
Acta Agronomica Hungarica | Year: 2010

Detailed coenological studies were made at four developmental stages during the vegetation period in three sowing date variants in a long-term multifactorial experiment carried out in the Crop Production Institute of Pannon University. Both experimental years had poor rainfall supplies. The Balázs-Ujvárosi scoring method was used to register the extent of weed infestation and how it changed over the vegetation period. Both the wheat grain yield and the level of weed infestation were greatly influenced by the sowing date. Averaged over the two years, the largest volume of weeds was recorded in March. After the wheat started shooting, the weeds were suppressed. The three sowing dates had the greatest effect on weed growth from the stage of initial development to shooting. After late sowing, the smallest number of weeds was observed during this period in both years. By the time the crop matured the level of weed infestation had changed, with the largest number of weeds in the late-sown variant, where the wheat did not form a closed canopy. Averaged over all samplings in both years, the following five species had the highest abundance: Stellaria media (4.86%), Veronica hederifolia (3.38%), Papaver rhoeas (1.97%), Capsella bursa pastoris (1.41%), Matricaria maritima (0.96%).

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