Abdel-Wareth, Ahmed Aboubaker Abdel-Moniem: Effect of thyme, oregano and their major active components on performance and intestinal microbial populations of broilers. - Bonn, 2011. - Dissertation, Rheinische Friedrich-Wilhelms-Universität Bonn.
Online-Ausgabe in bonndoc: https://nbn-resolving.org/urn:nbn:de:hbz:5N-25275
urn: https://nbn-resolving.org/urn:nbn:de:hbz:5N-25275,
author = {{Ahmed Aboubaker Abdel-Moniem Abdel-Wareth}},
title = {Effect of thyme, oregano and their major active components on performance and intestinal microbial populations of broilers},
school = {Rheinische Friedrich-Wilhelms-Universität Bonn},
year = 2011,
month = may,

note = {The aim of the present study implied an evaluation of the potential of different increasing levels of thymol, carvacrol, a mixture of thymol and carvacrol, as well as thyme and oregano as feed additives in broiler diets, in order to observe their influence on feed intake, performance, digestibility, carcass traits and gastro-intestinal microflora. Thymol, carvacrol or their combination were offered at 0, 100, 200, 300, 400 or 500 mg/kg. while thyme or oregano were offered at 0, 10, 15, 20, 25 or 30 g/kg diet to 120 unsexed chickens in each trial from 4-42 days of age. Different levels of thymol revealed quadratic effects on body weight gain (BWG) and feed intake (FI), as well as linear improvements on feed conversion ratio (FCR) and nitrogencorrected apparent metabolizable energy (AMEN) contents. Thymol addition also exhibited a linear increase of Lactobacillus spp. colony forming units (CFU) in the crop just as a quadratic increase in total viable count. Various levels of carvacrol revealed linear and quadratic effects for BWG, FI and FCR. Highest improvements for AMEN were observed when the maximal level of carvacrol was supplemented. Moreover, significant increases for total viable count were observed in this trial. The mixture of thymol and carvacrol revealed linear and quadratic improvements for BWG, FI and FCR, as well as an increase in carcass weight. The addition of thyme at different levels displayed a quadratic effect for BWG and a linear response for FCR among thyme treatments. Moreover, the treatment exhibited a significant improvement in AMEN concentrations. Quadratic effects among thyme treatments were observed for carcass weight, dressing percentage, liver weight, giblets percentage and intestinal Lactobacillus CFU. Increasing levels of oregano revealed quadratic responses in BWG, FI and FCR, as well as linear and quadratic effects on carcass weight and a linear decrease in abdominal fat. Furthermore, oregano supplementation improved AMEN concentrations. No clear effects were observed for intestinal bacterial counts of broilers. All treatments exhibited highest improvements when medium concentrations were supplemented to diets. In conclusion it can be stated that thyme and oregano and their active components thymol and carvacrol can be used as effective feed additives to improve performance and gut health of broiler chickens. However, future research is needed to determine the optimal dietary inclusion level and the exact mode of action of the examined plants and active components.},
url = {https://hdl.handle.net/20.500.11811/4729}

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