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UPV Theses and Dissertations

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Department: search.filters.department.College of Arts and SciencesKeyword: search.filters.keyword.Seaweed

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    Wine production from different species of seaweed
    Benosa, Sophia Grace O. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 2009-04)
    This study specifically aimed to test and compare the wine production of Gracilaria verrucosa, Kappaphycus alvarezii, and Kappaphycus striatum based on the physicochemical evaluation. The best seaweed wine produced was also determined through sensory evaluation. The samples underwent a 28-day fermentation period using Saccharomyces cerevisiae 2185 under room temperature at a pH of 3.0 and sugar content of 30%. Based on the physicochemical parameters, Gracilaria verrucosa was the best wine—high percentage of alcohol content, stable pH during the entire fermentation period, sweet taste of the wine owing to the high residual sugar, high amount of percent (%) TA without affecting the taste of the sample, clarity of the wine product after fermentation owing to the low total suspended solids. Gracilaria verrucosa also produced the best seaweed wine based on sensory evaluation.
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    The effect of seaweed (Kappaphycus alvarezii) as a partial substitute for commercial feed on the growth of chicken
    Bedia, Alma Mae S. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 1994-08)
    The study determined whether the use of seaweed (Kappaphycus aIvarezii) in different amounts as a partial substitute to commercial feeds would enhance the growth of chickens, reduce feed consumption, increase feed efficiency, and increase profit. The chickens were first fed with commercial broiler starter mash feeds for 15 days. Then, on the 16th day to the 35th day, the chickens were fed with different combinations in 1:1, 1:2, and 1:3 ratios of commercial broiler finisher feeds to K. alvarezii. Chickens fed with purely commercial broiler finisher feeds served as the control. Feed consumption, liveweight gain, and feed efficiency were computed every three days, while Profitability was determined at the end of the experimental period. Results showed that the use of K. alvarezii as a partial substitute to commercial broiler finisher feeds in a 1: 1 ratio increased the profit as well as the growth of the chickens, and it is comparable to that in the control (fed with purely commercial broiler finisher feeds). When the amount of K. alvarezii in the feed ration is more than 50% (1:1 ratio), it was observed that it would hamper the growth of the broilers.
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    Comparison of protein quality of three seaweed species (Sargasum polycystum, Sargassum oligocystum and Ulva pertusa) from Panay and Guimaras Island, Philippines for potential use in milkfish feed
    Arnaiz, Regina Marielle T. (Division of Chemistry, College of Arts and Sciences, University of the Philippines Visayas, 2016-06)
    Aquafeed production is the largest expenditure in intensive aquaculture operations, contributing to about 40-60% of total costs (Yildrim et al., 2009; Akiyama et al., 1992 cited in Ali et al., 2009). This is mostly due to the ingredients being used, particularly the protein source fishmeal (Millamena, 2002). The variable and finite supple of fishmeal, however, result in high costs, prompting the search for cheaper alternative ingredients as a priority in cost reduction practices regarding the production of aquafeeds (Attala and Mikhail, 2008). Seaweeds have known nutritional values, and are naturally abundant in Philippine waters, thus their potential could be tapped to reduce costs in aquaculture and could therefore maintain the sustainability of the industry (Shields and Lupatsch, 2012; Trono, 1999). In this study, the protein quality of two brown seaweeds (Sargassum polycystum and Sargassum oligocystum) and one green seaweed (Ulva pertusa) was evaluated by determining their crude protein content, inhibitory activities against trypsin and chymotrypsin, and in vitro protein digestibility. Among the three species, the green seaweed U. pertusa has the highest crude protein content at 23.43%. The obtained crude protein content was 8.28% for S. polycystum and 9.22% for S. oligocystum. Trypsin inhibition of the seaweeds ranged from 54-57%, and chymotrypsin inhibition was from 57-64%. Total phenolic content (TPC) was highest in S. polycystum, and lowest in S. oligocystum. In vitro protein digestibility action of milkfish gut enzyme was highest in S. oligocystum (92.30 ± 2.80), followed by the observed digestibility in U. pertusa (75.01 ± 2.14), and lowest in S. polycystum (64.99 ± 8.11). Determination of Pearson's correlation (r) showed a negative correlation (r=-0.99, p=0.08) existing between the TPC and %RPD values. Based on the results, among the threes species, U. pertusa with 23.43% crude protein content and a %RPD of 75.01% has a potential for partial inclusion in aquafeeds to reduce costs.