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Production, Process Design And Quality Characterization Of Catfish Visceral Oil., Subramaniam Sathivel
Production, Process Design And Quality Characterization Of Catfish Visceral Oil., Subramaniam Sathivel
LSU Historical Dissertations and Theses
Between 45--55% of viscera, head, skin, intestine and slurries are generally generated as byproducts or waste from catfish filleting process. Our preliminary study showed that the crude fat content of the whole catfish viscera was 30--35% (wet basis) and the total o-3 fatty acids of oils recovered from the whole and/or portioned viscera ranged from 4.3--20.9 mg/g (dry basis). Catfish viscera may serve as an excellent source of health-promoting oil. Yield of purified (deodorized) catfish visceral oil was 65.7% and contained considerable amounts of DHA (1.21 mg/g of oil) and omega-3 fatty acid (4.6 mg/g of oil). A rapid microwave-assisted …
Patterns Of Reef Fish Larval Supply To Petroleum Platforms In The Northern Gulf Of Mexico., James Marvin Tolan
Patterns Of Reef Fish Larval Supply To Petroleum Platforms In The Northern Gulf Of Mexico., James Marvin Tolan
LSU Historical Dissertations and Theses
Surveys of ichthyoplankton assemblages were conducted from four oil and gas platforms located in the northern Gulf of Mexico from November 1994 through July 1997. Diurnal collections, supplemented with light trap collections from the surface and -20 m depth, were taken quarterly during 1994 and 1995. Quarterly ichthyoplankton sampling at dawn and dusk only during 1996 and 1997 were supplemented with surface "lighted plankton net" collections. Of the 36,676 individuals collected, epipelagic (neretic and oceanic Clupeiformes, neretic Carangidae and Lutjanidae, as well as oceanic Scombridae) and mesopelagic (Myctophidae and Gonostomatidae) families comprised the majority of the ichthyoplankton. Reef-dependent (e.g., Pomacentridae, …
Glyphosate- And Glufosinate -Resistant Technologies: Weed Management And Off-Target Crop Response., Jeffrey Mark Ellis
Glyphosate- And Glufosinate -Resistant Technologies: Weed Management And Off-Target Crop Response., Jeffrey Mark Ellis
LSU Historical Dissertations and Theses
Utility of preemergence soil-applied herbicides at full and half label rates were evaluated in glyphosate-resistant soybean. In most instances, differences in early season weed density and height were not noted when rates were reduced. None of the herbicides provided complete weed control, but some delayed weed growth providing an extra 3 to 7 days before the first postemergence glyphosate application was needed. Based on weed control and soybean yield, use of glyphosate alone was as effective as when preemergence herbicides were followed by glyphosate. In another study, barnyardgrass control with glyphosate at 0.84 and 1.12 kg ai/ha was not antagonized …
Remediation Of An Oil Contaminated Wetland And The Effects Of Crude Oil And Brine On Two-Year Old Loblolly Pine (Pinus Taeda) Seedlings., Dean Anthony Goodin
Remediation Of An Oil Contaminated Wetland And The Effects Of Crude Oil And Brine On Two-Year Old Loblolly Pine (Pinus Taeda) Seedlings., Dean Anthony Goodin
LSU Historical Dissertations and Theses
The goal of this project is to introduce a successful remediation and restoration plan for a wetland and pine forest contaminated by an oil well blowout. A field study focused on the effectiveness of ammoniated bagasse (ABG) to enhance the bioremediation of the contaminated wetland. A comprehensive soil and vegetation greenhouse study investigated the effects of oil and brine on loblolly pine tree seedlings and the effectiveness of ABG to remove and remediate oil contaminated forest soils. The most effective, ecologically sound, and economical plan to remove the oil from the wetland was to burn the area. Once the area …
Effects Of Energy Source And Soil Reaction On Redox, Soil Color, And Sesquioxide Transformation For The Moreland And Sharkey Soils., Jang-Hung Huang
Effects Of Energy Source And Soil Reaction On Redox, Soil Color, And Sesquioxide Transformation For The Moreland And Sharkey Soils., Jang-Hung Huang
LSU Historical Dissertations and Theses
Moreland clay (very fine, smectitic, thermic, Oxyaquic Hapluderts) derived from Red River alluvium does not exhibit redoximorphic features, though it is saturated for more than 2 months during the growing season. Sharkey clay (very-fine, smectitic, thermic Chromic Epiaquerts) derived from the Mississippi River alluvium exhibits redoximorphic features. The objectives of this study were to determine the effects of energy sources and adjusted pH on Eh, pH, and iron transformation on these two Vertisols in Louisiana. Laboratory analysis was used to evaluate the factors controlling the formation of redoximorphic features. The first experiment was designed to predict the effects of 10 …
The Effect Of Calcium Silicate On Rice Yield And Sheath Blight Disease., Chris Raymond Robichaux
The Effect Of Calcium Silicate On Rice Yield And Sheath Blight Disease., Chris Raymond Robichaux
LSU Historical Dissertations and Theses
Sheath blight caused by fungal pathogen Rhizoctonia solani can cause significant yield loss in rice, especially in warm, high rainfall environments. Integrated pest management (IPM) is the key to sheath blight control. This system utilizes disease resistance, pesticides, cultural practices and biological control to control multiple pests. Silicon fertilization is an additional cultural practice that can reduce sheath blight severity and increase grain yield. Studies were conducted in the greenhouse and field to determine the effect of calcium silicate on sheath blight severity, rice grain yield, and leaf silicon concentration. Results in the greenhouse study showed that sheath blight severity …
The Role Of Kernel Epicuticular Wax In Zea Mays Resistance To Aspergillus Flavus And Aflatoxin Production., You-Keng Goh
The Role Of Kernel Epicuticular Wax In Zea Mays Resistance To Aspergillus Flavus And Aflatoxin Production., You-Keng Goh
LSU Historical Dissertations and Theses
The physical and chemical roles of Zea mays (corn) kernel epicuticular wax in conferring resistance to aflatoxin production were examined. There was no evidence of a correlation between the amount of epicuticular wax and aflatoxin production in a kernel development experiment. Aflatoxin levels decreased as kernels developed. Epicuticular wax removal reduced aflatoxin at the earlier stages of development but increased aflatoxin in some genotypes at the later stages, indicating the importance of epicuticular wax during late-stage development and hinting of different defense mechanisms between the early- and late-stage kernels. The amount of epicuticular wax from mature kernels of 23 commercial …
Spatial Variability And Isotopic Studies Of The Prairie -Forest Transition Soil In Louisiana., Asfaw Bekele
Spatial Variability And Isotopic Studies Of The Prairie -Forest Transition Soil In Louisiana., Asfaw Bekele
LSU Historical Dissertations and Theses
The calcareous prairies of Louisiana are among the most endangered ecosystems in North America. The major threat to this ecosystem is the invasion by woody and herbaceous plants, primarily eastern red cedar (Juniperus virginiana ). The restoration and management of these rare plant communities require a thorough understanding of the soils supporting them. Geostatistical, fractal, and stable isotopic procedures were integrated to study the soil and vegetation spatial variability. The prairie soil was alkaline, the forest soil was acidic, and the transition soil was neutral. The spherical model described the spatial variability of virtually all the soil properties considered with …
Molecular Systematics Of Eastern Cottonwood Using Aflp And Rapd Markers., Xiaohong Ma
Molecular Systematics Of Eastern Cottonwood Using Aflp And Rapd Markers., Xiaohong Ma
LSU Historical Dissertations and Theses
Eastern cottonwood (Populus deltoides Bartr.) is the fastest growing tree in southeastern United States with great potential as a biomass source. DNA-based molecular marker techniques are playing increasingly important roles in elucidating genetic diversity within species. Amplified fragment length polymorphism (AFLP) and random amplified polymorphic DNA (RAPD) markers were employed to study genetic relationships among 57 clones from subregion Lower Mississippi river, West Central, and West Gulf. A total of 101 polymorphic RAPD markers were amplified from 14 primers. Six AFLP primer pairs resulted in a total of 457 polymorphic markers. Both RAPD and AFLP markers were able to uniquely …
Physicochemical, Functional And Spectroscopic Analysis Of Crawfish Chitin And Chitosan As Affected By Process Modification., Sandeep Kumar Rout
Physicochemical, Functional And Spectroscopic Analysis Of Crawfish Chitin And Chitosan As Affected By Process Modification., Sandeep Kumar Rout
LSU Historical Dissertations and Theses
Traditional isolation of chitin from crawfish shells involves three sequential steps: demineralization (DM, removing calcium carbonate/phosphate), deproteinization (DP), and decolorization (DC, removing mainly astaxanthin). The first two steps can be reversed (i.e., DMP or DPM). Chitin is converted to chitosan by deacetylation (DA). Isolation steps may be shortened, depending on intended applications of chitosan. The first study investigated effects of (1) reversing sequence and (2) eliminating DP and DC steps on physicochemical and functional properties of chitosan and conversion efficiency of chitin. Twelve different processes: DM, DP, DPM, DMP, DPMC, DMPC, DMA, DMCA, DPMA, DMPA, DPMCA, DMPCA were investigated. DA …
Effects Of Lipids, Amino Acids, And Beta-Cyclodextrin On Gelatinization, Pasting, And Retrogradation Properties Of Rice Starch., Xiaoming Liang
Effects Of Lipids, Amino Acids, And Beta-Cyclodextrin On Gelatinization, Pasting, And Retrogradation Properties Of Rice Starch., Xiaoming Liang
LSU Historical Dissertations and Theses
The primary purpose of this study was to determine the addition of lipids, amino acids, and beta-cyclodextrin effects on commercial rice starch gelatinization, pasting, and retrogradation properties by using differential scanning calorimetry (DSC), rapid visco analysis (RVA), and x-ray diffractometry (XRD). Analyses from commercial rice starch showed that the presence of 0.6% monopalmitin (MP) increased the peak viscosity (PV), minimum viscosity (MV), and final viscosity (FV) by 38, 27, and 72 RVU respectively. The pasting temperature was also increased by 6°C, whereas the total setback (TSB) was increased by 45 RVU. Incorporation of lysophosphatidylcholine (LC) and lysophosphatidylethanolamine (LE) also showed …
Effect Of Chromium, Dried Brewers Yeast, And Mannan Oligosaccharides On Sow Productivity And Growth Performance Of Weanling Pigs., Frederick Masson Lemieux Jr
Effect Of Chromium, Dried Brewers Yeast, And Mannan Oligosaccharides On Sow Productivity And Growth Performance Of Weanling Pigs., Frederick Masson Lemieux Jr
LSU Historical Dissertations and Theses
Five experiments were conducted to evaluate the effects of mannan oligosaccharides (Bio-Mos) on growth performance, carcass characteristics, and pork quality of pigs. The first two experiments evaluated 0.20 and 0.30% Bio-Mos. The data indicated that the 0.20% level of Bio-Mos was more effective, and this level was used in the remainder of the experiments. Interactive effects of Bio-Mos and excess dietary Zn were evaluated in Exp. 2 and 3 and Trial 2 of Exp. 4. In Trial 1 of Exp. 4, Bio-Mos was fed with and without an antibiotic. In addition to the weanling pig experiments, 0.30% Bio-Mos was fed …
Evaluating The Taxonomic Status Of The Great White Heron (Ardea Herodias Occidentalis) Using Morphological, Behavioral And Genetic Evidence., Heather Louise Mcguire
Evaluating The Taxonomic Status Of The Great White Heron (Ardea Herodias Occidentalis) Using Morphological, Behavioral And Genetic Evidence., Heather Louise Mcguire
LSU Historical Dissertations and Theses
The Great White Heron was originally described as a distinct species (Ardea occidentalis), but is currently considered to be the white morph of a polymorphic Great Blue Heron subspecies (A. herodias occidentalis). Great White and Great Blue heron breeding ranges overlap in the Florida Keys (USA), providing an opportunity to evaluate the degree to which these two taxa are reproductively isolated. The current classification leads to predictions of no significant size difference (H01), random mate choice (H02), and no genetic divergence (H03) between sympatric white and blue herons. Sympatric Great White and Great Blue herons did not differ significantly in …
Crop Response And Weed Control With Glufosinate In Rice., David Yves Lanclos
Crop Response And Weed Control With Glufosinate In Rice., David Yves Lanclos
LSU Historical Dissertations and Theses
Studies were conducted to evaluate crop tolerance and yield of glufosinate-resistant rice lines treated with glufosinate throughout the season. In addition, studies were conducted on harvested seed treated with glufosinate at various growth stages to evaluate seed weights, germination, and seedling vigor. Weed control with glufosinate alone and in combination with other herbicides was evaluated. Red rice control with different glufosinate rates and timings under 5, 10, and 20 cm permanent flood depths was also evaluated. In the tolerance study, CPRS PB-13 injury was less than 10% for all timings and no differences in yield were detected when compared with …
Cytopathology, Detection, And Identification Of Viruses Infecting Sweetpotato., Jeonggu Sim
Cytopathology, Detection, And Identification Of Viruses Infecting Sweetpotato., Jeonggu Sim
LSU Historical Dissertations and Theses
Studies with the transmission electron microscope were used to detect and attempt to identify viruses infecting sweetpotato (Ipomoea batatas ) and other Ipomoea species. Flexuous-rods, short curved-rods, and spherical virus-like particles were observed in cells of symptomatic plants. Also, various cytopathic changes such as crystals, vesicles, fibril structures, and cylindrical inclusions were observed. Some of these cytopathic changes were associated with specific viral groups such as genus Crinivirus and Potyvirus and therefore helpful in diagnosis. Some molecular and biological properties of an isolate of Sweetpotato chlorotic stunt virus from the sweetpotato cultivar White Bunch (SPCSV-WB) were determined. Two species of …
Optimization Of Agrobacterium-Mediated Genetic Transformation Of Soybean Using Glufosinate As A Selective Agent., Shaomian Yao
Optimization Of Agrobacterium-Mediated Genetic Transformation Of Soybean Using Glufosinate As A Selective Agent., Shaomian Yao
LSU Historical Dissertations and Theses
Soybean [Glycine max (L.) Merr] is one of the most important oil crops. Genetic transformation techniques can provide new tools for soybean improvement. The production of transgenic soybean has been limited. This research integrated a modified soybean regeneration system into a transformation protocol to optimize the production of transgenic soybean. Soybean hypocotyls and cotyledonary nodes were cultured on Gamborg B5 medium containing thidiazuron (TDZ). TDZ at 0.16 muM was found superior to other concentrations for inducing multiple shoot formation. Explants isolated from seedlings germinated on medium containing 6-benzyl-aminopurine (BAP) greater than 7 muM produced more multiple shoots than when on …
The Relationship Of Biomass Allocation And Nutrient Dynamics In Loblolly And Slash Pine Forests., Christopher Ashley Dicus
The Relationship Of Biomass Allocation And Nutrient Dynamics In Loblolly And Slash Pine Forests., Christopher Ashley Dicus
LSU Historical Dissertations and Theses
Aboveground biomass allocation and its effect on various aspects of N and P dynamics were investigated in loblolly pine (Pinus taeda L.) and slash pine (Pinus elliottii Engelm.) stands planted at different spacings. Further, the relationship of nutrient demand and root production was investigated to validate the functional balance hypothesis in forest stands. N mineralization was greater in loblolly pine stands than slash pine, corresponding with greater needle litter N concentration. Both N and P mineralization increased in loblolly pine stands with increasing stand density, the result of greater nutrient input through increased litterfall. There were no species differences in …
Habitat Influences On Nongame Bird Nest Success In A Managed And Fragmented Southern Pine Forest., Michael Darren Baker
Habitat Influences On Nongame Bird Nest Success In A Managed And Fragmented Southern Pine Forest., Michael Darren Baker
LSU Historical Dissertations and Theses
We confirmed the breeding-season presence of 52 bird species and assessed the reproductive quality of a fragmented southern pine forest managed for natural resource extraction on Barksdale Air Force Base in northwest Louisiana, USA. We also conducted point counts to assess relative abundance, richness, and diversity among four habitat discontinuity types (timber harvests, pipeline corridors, access roads, and natural gas wells). Each parameter was greater on study plots adjacent to gas wells than on those adjacent to roads. We determined the fate of 817 nests of 42 species between 1996 and 1998 and determined Mayfield daily nest success (MDNS) for …
Modified Atmosphere Packaging Of Fresh -Cut Sweetpotatoes., Elif Erturk
Modified Atmosphere Packaging Of Fresh -Cut Sweetpotatoes., Elif Erturk
LSU Historical Dissertations and Theses
Fresh-cut sweetpotato products have potential to create new value-added market opportunities. To determine optimum film packaging and storage temperature, fresh-cut sweetpotato slices were packaged with semipermeable polyolefin films, having different gas transmission characteristics and kept at 2 or 8°C for 14 days. The films chosen, in order of increasing permeability, were Cryovac PD900, PD961, and PD941. Among the films, only PD941 film bags maintained an aerobic atmosphere during the 14 days at both temperatures. However, the high weight loss in slices with PD941 film bags will limit the use of these film bags as modified atmosphere packaging (MAP) material. PD961 …
The Effect Of Phytase On Nutrient Availability In Diets For Swine And Poultry., Sara Leann Johnston
The Effect Of Phytase On Nutrient Availability In Diets For Swine And Poultry., Sara Leann Johnston
LSU Historical Dissertations and Theses
A series of experiments was conducted to determine the effect of increasing phytase coefficient of variation (CV) in chick diets, and to determine the effect of phytase addition on nutrient availability in diets for swine and poultry. The first experiment (EXP) simulated varying mix uniformity of phytase by alternately providing two diets with two different concentrations of microbial phytase (FTU). Increasing phytase CV had little effect on growth performance, whereas bone ash and breaking strength and Ca and P retention and excretion decreased only at the most extreme CV. These data suggest that a phytase CV of between 34 and …
Biological And Molecular Properties Of Sweet Potato Leaf Curl Virus., Pongtharin Lotrakul
Biological And Molecular Properties Of Sweet Potato Leaf Curl Virus., Pongtharin Lotrakul
LSU Historical Dissertations and Theses
In 1994, a sweet potato sample showing leaf curl symptoms was collected from the field in Louisiana. When graft-inoculated, Ipomoea setosa reacted with mild upward leaf curling while I. aquatica reacted with a bright yellow mottle. The putative virus was transmitted by the sweet potato whitefly, Bemisia tabaci biotype B, and it was designated the United States isolate of Sweet potato leaf curl virus (SPLCV-US). Four independent Southern blot hybridizations using the DNA-A of different begomoviruses as probes confirmed the presence of begomovirus-like DNA in the infected plants. Fibrillar inclusions and granular aggregates of geminivirus-like particles were observed in the …
Structure, Expression And Promoter Activity Of Ubiquitin Genes From Rice (Oryza Sativa L.)., Jianlin Wang
Structure, Expression And Promoter Activity Of Ubiquitin Genes From Rice (Oryza Sativa L.)., Jianlin Wang
LSU Historical Dissertations and Theses
Successful transgenic plant production is largely dependent on the use of suitable promoters. In this study, we described isolation of rice ubiquitin genes, and demonstrated the potential utility of the rice ubiquitin promoters in plant transformation systems. Two polyubiquitin genes (RUBQ1 and RUBQ2) and two ubiquitin extension/fusion genes (RUBQ3 and RUBQ4) have been isolated from a rice genomic BAC library. DNA sequence data revealed that both RUBQ1 and RUBQ2 contained an open reading frame encoding a hexameric precursor ubiquitin and an intron immediate upstream of the initiation codon. The two ubiquitin fusion/extension genes RUBQ3 and RUBQ4 contained one repeat of …
The Effects Of Dietary Fatty Acids And Non -Steroidal Anti -Inflammatory Drugs On Cyclooxygenase-2 Expression., Kyung-Hee Sohn
The Effects Of Dietary Fatty Acids And Non -Steroidal Anti -Inflammatory Drugs On Cyclooxygenase-2 Expression., Kyung-Hee Sohn
LSU Historical Dissertations and Theses
Dietary n-3 fatty acids and non-steroidal anti-inflammatory drugs (NSAIDs) were shown to have cancer preventive and tumor regressive effects. Fatty acids and NSAIDs are substrate and inhibitors, respectively, of cyclooxygenase-2 (COX-2), which is a key enzyme in the conversion of arachidonic acids to prostaglandins. Thus, the modulating effects of different types of dietary fatty acids and NSAIDs on the expression of COX-2 are studied here. Results show that both n-3 and n-6 polyunsaturated fatty acids (PUFAs) inhibit Lipopolysaccharide (LPS)-induced COX-2 expression and NF-kappaB activation in macrophages. Results from in vitro cell proliferation study indicate that growth of colon tumor cells …
Boron -Uptake Mechanisms And Boron Nutrition Of Rice., Xiaohe Yu
Boron -Uptake Mechanisms And Boron Nutrition Of Rice., Xiaohe Yu
LSU Historical Dissertations and Theses
There are very few studies on B deficiency in rice (Oryza sativa L.). Reported critical values of B deficiency in rice are contradictory and mechanisms of B uptake by plant are not understood. Objectives of this study were to determine B effects on rice grown in hydroponics and soil; to determine critical values of B deficiency in rice tissues, hydroponic solution and soil; and to explore B-uptake mechanisms in both monocots (rice) and dicots (soybean (Glycine max L.)). Rice was grown to maturity in an acid Caddo silt loam at 0 and 1 kg B ha--1 in a greenhouse study, …
Influence Of Pyrithiobac And Insecticide Combinations On Cotton Growth And Early Season Pest Control., Richard Whitman Costello
Influence Of Pyrithiobac And Insecticide Combinations On Cotton Growth And Early Season Pest Control., Richard Whitman Costello
LSU Historical Dissertations and Theses
Field studies were conducted at two locations in Northeast Louisiana, to investigate interactions associated with the herbicide pyrithiobac and insecticide combinations in respect to weed control and insecticide efficacy and cotton response. In addition, controlled environment experiments were conducted to evaluate the effect of temperature regimes and simulated thrips damage on pyrithiobac plus insecticide phytotoxicity to cotton. Pyrithiobac and insecticide combinations when compared with pyrithiobac alone did not reduce cotton leaf area, height, main stem node number, main stem nodes to first square, days to first square or flower, main stem nodes above white flower, or seedcotton yield. Acephate insecticide …
American Alligator Nesting Ecology In Impounded Marsh Habitat, Louisiana., Steven Richard Reagan
American Alligator Nesting Ecology In Impounded Marsh Habitat, Louisiana., Steven Richard Reagan
LSU Historical Dissertations and Theses
The goal was to monitor a large number of female alligators over a 3-year period to obtain information on alligator nesting ecology. This dissertation, although designed to estimate annual nesting rates, provides additional meaningful information on methods of capture, tag retention rates, nest spacing patterns, segregation of size classes, nest site fidelity, the relationship between attendance and nest success, the effects of fire ants on alligator nest success, the relationship between hatchling alligators and their mother, and hatchling dispersal. Passive integrated transponder (PIT), monel web, and cranial mounted reflector tags were evaluated for marking and identifying alligators. Use of harmonic …
A Method To Discriminate Species From Hydroacoustic Fish Sampling Systems., Rui De Paula E Silva
A Method To Discriminate Species From Hydroacoustic Fish Sampling Systems., Rui De Paula E Silva
LSU Historical Dissertations and Theses
Samples of species and size composition obtained by trawling were matched with the corresponding echo-distributions from two hydroacoustic and trawl surveys in the western Indian Ocean, off Mozambique, and in two surveys in the northern Gulf of Mexico. In the Mozambique surveys, a Simrad EY-M echosounder was used and the data was analyzed by applying the Craig & Forbes algorithm. In the Gulf of Mexico surveys, a BioSonics Dual-beam System (Model 102 echosounder, ESP echo-integrator, and ESP dual-beam processor) was used. The results obtained show that, provided that a particular hydroacoustic and trawl sample yielded a stable size-distribution of the …
Influence Of Weed Control Programs In Glyphosate -Resistant Cotton On Insects And Seedling Disease., Joseph Harry Pankey
Influence Of Weed Control Programs In Glyphosate -Resistant Cotton On Insects And Seedling Disease., Joseph Harry Pankey
LSU Historical Dissertations and Theses
Research conducted from 1997 to 1999 in cotton (Gossypium hirsutum L.) and in non-crop areas evaluated early season insect control and weed control with labeled rates of several insecticides and the herbicide glyphosate applied alone and in combinations. Dicrotophos plus glyphosate improved aphid (Aphis gossypii Glover) control, and thrips (Frankliniella spp.) control was improved with the addition of glyphosate to acephate, dicrotophos, or dimethoate. Redweed (Melochia corchorifolia L.) control was reduced with glyphosate plus endosulfan, and addition of oxamyl, endosulfan, dicrotophos, and imidacloprid reduced prickly sida (Sida spinosa L.) control compared with glyphosate alone. Only the glyphosate plus lambda-cyhalothrin combination …
Effects Of Dietary Phytase Supplementation On Growth, Nutrient Utilization, And Phytate Degradation In Channel Catfish, Ictalurus Punctatus., Weibing Yan
LSU Historical Dissertations and Theses
Phytase supplementation increases the availability of phosphorus in fish diets, and dietary protein utilization might be increased as well by lower phytate concentrations in phytase supplemented diets. Experiments were conducted to determine if weight gain; protein utilization; mineral retention; apparent dry matter, protein and mineral digestibility; and phytate degradation in the stomach of channel catfish fed an all-plant-protein diet could be improved by phytase supplementation. Seven diets were tested: a nutrient complete diet (TC) containing 5% fish meal and six all-plant-protein diets (T1--T6) that contained minimal levels of available phosphorus (0.16%; total P = 0.57%) and zinc (53.37 ppm), but …
Effects Of Cobalt-60 Gamma Irradiation On The Malaysian Prawn Macrobrachium Rosenbergii., Nyanti Lee
Effects Of Cobalt-60 Gamma Irradiation On The Malaysian Prawn Macrobrachium Rosenbergii., Nyanti Lee
LSU Historical Dissertations and Theses
A major obstacle in culture of the Malaysian prawn, Macrobrachium rosenbergii, is the complex social structure whereby a few large males dominate the population and reduce production. The goal of this work was to induce reproductive sterility by use of gamma radiation as a means to increase production. Of the 62 publications related to the use of gamma radiation in aquatic species published between 1938 and 1996, 66% did not indicate performance of dosimetry (dosage verification). Samples were not rotated during irradiation in 98% of these studies, which introduces considerable variation in dose. A dosimetric study in this dissertation found …