Universidad Internacional del Ecuador
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Effects of dietary supplementation with<i> Codium</i><i> fragile</i> and fennel essential oil on growth, enzyme activity, and hepatopancreas histology in juvenile narrow-clawed crayfish<i> (Pontastacus</i><i> leptodactylus</i> Eschscholtz, 1823)
No full textThis study investigated the impact of different levels of Codium fragile macroalgae (CF) dietary supplementation combined with a fixed concentration of 0.05% fennel (Foeniculum vulgare Mill. var. dulce Mill.) essential oil (FO) on the growth performance, enzyme activity, and hepatopancreas histological changes of juvenile narrow-clawed crayfish Pontastacus leptodactylus (initial average weight = 0.25 +/- 0.04 g). A 90-day feeding trial was conducted using four experimental groups: CF + FO (control), 1% CF + FO, 2% CF + FO, and 4% CF + FO. The essential oil yield obtained from the fennel seeds was 2.4%. Anethole was the most abundant component of FO (79.14%), followed by estragole (9.21%), limonene (3.49%), and p-anisaldehyde (2.75%). Fifteen crayfish per tank were stocked in 30 L plastic tanks, with three replicates for each treatment. The results showed that juvenile crayfish in the 1% CF + FO group showed the best growth performance (2.26 +/- 1.30 g), weight gain (2.03 +/- 1.24 g), protease activity (567.80 +/- 13.71 U/mg protein), and the lowest feed conversion ratio (1.32 +/- 0.30) (p < 0.05). The highest protein (13.40%) and lipid (2.0%) contents were also observed in the 1% CF + FO group. Dietary supplementation with 1% CF + FO improved the histomorphology of the hepatopancreas. In contrast, supplementation with 4% CF + FO caused histomorphological alterations, including hepatocyte vacuolation, tubule enlargement, and cellular fractionation. In conclusion, supplementation of the diet with 1% CF and 0.05% FO significantly enhances growth performance, stimulates digestive enzyme activity, and improves the hepatopancreas histological structure in juvenile P. leptodactylus
Effects of Plant Nutrients on Oil Content and Oil Quality of Peanut
No full textPlant nutrients are essential for plant physiology, although they are required in small quantities. Along with detecting nutrient shortages, it is crucial to study the varied impacts of nutrients such as iron, sulfur, and selenium. This study specifically investigated the combined effects of iron, sulfur, and selenium fertilizers on the oil content and oil quality factors of peanuts (Arachis hypogaea L.). The study was conducted in the Eastern Mediterranean of T & uuml;rkiye in 2021 and 2022, using a split-split-plot design with three replications. The treatments of Fe (0% and 3%) were assigned to the main plots, S (0, 40, and 60 kg ha-1) to the sub-plots, and Se (0, 20, and 40 ppm) to the sub-sub-plots. Oil content was not significantly affected by the fertilizer treatments, and the maximum values were obtained from the applications of 40 kg sulfur per hectare and 20 ppm selenium. Regarding the Oleic/Linoleic acids ratio, an important indicator of oil quality, the highest values were observed in the treatments of 40 to 60 kg sulfur per hectare and 20 to 40 ppm selenium. In conclusion, iron application had no significant effect, while the application of 40 to 60 kg ha-1 sulfur and 20 to 40 ppm selenium could improve the quality of peanut oil, as indicated by a lo
