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dc.contributor.advisor Fouad, Walid Mugwanya, Muziri 2019-07-18T12:51:02Z 2019-10-16T22:00:07Z Summer 2019 en_US 2019-07-18
dc.description.abstract Sorghum bicolor (L.) Moench is the world’s fifth mostly cultivated cereal after wheat, corn, barley, and oats. Although originated in Ethiopia, the United States is the leading producer and exporter of grain sorghum worldwide. In Africa, it is the second most widely grown crop after corn and mainly cultivated in the arid and semi-arid regions of the continent. Its hardiness to environmental stress and low costs of production has made it a more viable forage crop for animal consumption in marginal agricultural regions. In this study, twelve sorghum varieties were evaluated for their forage quality based on their agro-morphological traits and cell wall composition. Results of the agro-morphological trait analysis showed that black-seeded Sudangrass had the lowest dry weight compared to the sweet sorghum cultivars (Sugar Drip, Rex and Ramada) and this was significant at 90 days after sowing (DAS). This was reflected on its low in vitro digestibility and thus its low forage quality. In addition, the Sudan grasses exhibited a significant decrease in their fresh and dry weights, stalk diameter, leaf width and leaf number with advancing plant maturity. This correlated with their forage quality thus the best cutting time point for the Sudan grasses was at 75 DAS. Results of fiber fraction, nutritive analysis and in vitro digestibility indicated that Sugar Drip had the highest forage quality as evident from its low lignin content, high Relative Feed Value and highest Net Energy of Lactation at and this was significant at 90 DAS. This was followed by Rex, Ramada, MN1054, white-seeded Sudangrass, GK Aron and black-seeded Sudangrass. Grain sorghum cultivars were harvested at grain maturity and results of in vitro digestibility of their cell wall components were slightly comparable to sweet sorghum. However, Sohag was significantly superior to LG35 in terms of its RFV and in vitro digestible dry matter. Single nucleotide polymorphisms (SNPs) in one of the lignin biosynthesis genes; caffeic acid 3-O-methyltransferase (COMT) were evaluated for their effect on forage quality. The detected SNPs is expected to affect protein function. No correlation was noted between the COMT SNPs and lignin content and accumulation in the studied cultivars. Likewise, the detected SNPs did not have any effect of forage quality. en_US
dc.description.sponsorship Special thanks to Dr. Ashraf, director of the Regional Centre for Food and Feed for his assistance in all the forage analysis. I would love to express my heartfelt gratitude to the African Graduate Fellowship and the Student Support Grant without which my wonderful study and research experience in AUC would not have been possible. Thank you so much for the golden opportunity given to me as a beneficially of Egypt’s first-class higher education. en_US
dc.format.extent 113 p. en_US
dc.format.medium theses en_US
dc.language.iso en en_US
dc.rights Author retains all rights with regard to copyright. en
dc.subject Sudangrass en_US
dc.subject Sweet Sorghum en_US
dc.subject Grain Sorghum en_US
dc.subject Forage quality en_US
dc.subject.lcsh Thesis (M.S.)--American University in Cairo en_US
dc.title Assessment of forage quality Among the sudangrasses, sweet and grain sorghum inbred lines at different cutting time points en_US
dc.type Text en_US
dc.subject.discipline Biotechnology en_US
dc.rights.access This item is restricted for 3 months from the date issued en_US
dc.contributor.department American University in Cairo. Dept. of Biology en_US
dc.description.irb American University in Cairo Institutional Review Board approval is not necessary for this item, since the research is not concerned with living human beings or bodily tissue samples. en_US
dc.contributor.committeeMember Assem, Shireen
dc.contributor.committeeMember El-Fawal, Hassan
dc.contributor.committeeMember Nawar, Ali
dc.contributor.committeeMember Abdellatif, Ahmed

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  • Theses and Dissertations [1835]
    This collection includes theses and dissertations authored by American University in Cairo graduate students.

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