Digital Commons Network^™

Production Capabilities And Economic Potential Of An Australian Redclaw Crayfish (Cherax Quadricarinatus) Hatchery In The United States., Paul Boyce Medley

LSU Historical Dissertations and Theses

In most of the United States, overwintering redclaw crayfish (Cherax quadricarinatus) is necessary because they cannot withstand winter temperatures. Consequently, hatcheries are required to produce juveniles for pond stocking. The objectives of this study were: (1) identify biological factors affecting production of juvenile redclaw, (2) determine production capabilities of a redclaw crayfish hatchery, and (3) determine the economic potential of redclaw hatcheries. Experiments were designed to assess fecundity and factors influencing spawning such as stocking density, male/female weight, diet, mortality, and cannibalism. Research was also conducted to determine egg development time, hatching success, and juvenile growth and survival. Pooled survival …

Physiological Variation In Loblolly Pine (Pinus Taeda L.) As Related To Crown Position And Stand Density., Dennis Albert Gravatt

LSU Historical Dissertations and Theses

Physiological parameters were measured under natural light conditions and needle orientation from towers and walkways erected in the crowns of loblolly pine (Pinus taeda L.) trees. Photosynthetic light response curves, chlorophyll content, nutrient content and specific leaf area were determined for current-year foliage on detached branches. Two silvicultural treatments were randomly assigned to the twelve plots in the fall of 1988. Plots were thinned to a density of 731 trees per hectare or left unthinned, at a density of 2990 trees per hectare. The plots were left unfertilized or fertilized with 744 kg per hectare of diammonium triple superphosphate was …

Interactions Of Mouse And Bovine Preimplantation Embryos Prior To And After The In Vitro Developmental Block Stage., Leyi Li

LSU Historical Dissertations and Theses

The objective of the present study was to evaluate the effect of post-block mouse and bovine embryos on the development of pre-block embryos around the in vitro developmental block stage. The effect of the post-block embryos on the development of the pre-block embryos was evaluated in culture, in chimeras and in cytoplasmic hybrid embryos. The results indicate that post-block embryos were able to stimulate the development of the pre-block embryos in culture. The stimulatory effect of the post-block mouse and bovine embryos was found not to be species-specific and was synergistic with that of bovine granulosa cells. Chimeric parthenogenetic bovine …

Breeding Wheat For Resistance To Bacterial Leaf Streak Caused By Xanthomonas Campestris Pv. Translucens., Barry Lawrence Tillman

LSU Historical Dissertations and Theses

Bacterial leaf streak or black chaff caused by Xanthomonas campestris pv. translucens (Xct) can cause yield loss in wheat, especially in warm, high rainfall environments. Bactericidal chemicals have not been effective in controlling the disease, however, host resistance to leaf streak may be an effective control measure. Studies were conducted in the field and greenhouse to determine the relationship between the black chaff and leaf streak symptoms caused by Xct, to quantify yield loss, to calculate the heritability of leaf streak reaction and to evaluate germplasm for resistance to leaf streak. The results showed that 'Florida 304' is very susceptible …

Effects Of Heat, Lactic Acid, And Modified Atmosphere Packaging On Listeria Monocytogenes On Cooked Crawfish Tail Meat., Warren Joseph Dorsa

LSU Historical Dissertations and Theses

The generation time of L. monocytogenes was calculated to be 72.2, 28.5, 17.01, and 6.9 h on crawfish tail meat held at 0, 4, 6, and 12$\sp\circ$C, respectively. Potassium sorbate (PS) (0.3%) spray treatments on crawfish held at 4$\sp\circ$C, extended the lag phase of the bacterium. However, once exponential growth began, a generation time not significantly different (P $>$ 0.05) than that of untreated crawfish was observed. Samples sprayed with 0.3% citric acid (CA) and held at 4$\sp\circ$C supported growth of the bacterium equally well as that of untreated samples. Thermal inactivation of L. monocytogenes using a three neck …

Nutrient Restriction In Mares: Plasma Metabolite And Hormonal Characterization And Responses To Feeding And Metabolic Challenges., Leeann Salathe Sticker

LSU Historical Dissertations and Theses

Three experiments were designed to provide a comprehensive reference for the responses of plasma metabolites and hormones to control and restricted intakes of protein and(or) energy and to feed deprivation. The objectives of the first and second experiments were to characterize the effects of protein and(or) energy restriction on glucose, insulin, nonesterified fatty acids (NEFA), urea nitrogen (N), insulin like growth factor-1 (IGF-1), cortisol, triiodothyronine ($T\sb3$, thyroxine ($T\sb4$), prolactin, and growth hormone (GH) concentrations in plasma on a daily basis, after feeding, and after i.v. administration of glucose or epinephrine. The third experiment was conducted to answer questions of how …

Effect Of Processing On Protein And Carotenoids In Weaning Food Formulated From Sweetpotatoes, Or Apios Americana., Michael Andrew Ameny

LSU Historical Dissertations and Theses

White flesh sweetpotatoes (Ipomoea batatas (L.) Lam) are a major food crop in developing countries. This study was to evaluate the protein and carotenoid content and quality of various white fleshed African sweetpotatoes and Apios americana tubers for use as a weaning food. The sweetpotato and Apios are not normally considered sources of carotenoids and proteins, but the wide use of sweetpotatoes as a source of carbohydrate and the renewed interest in Apios warrant the study of carotenoids and proteins in these crops. Total carotenoids ranged from 0$\mu{\rm g}$/100g to 260$\mu$g/100g (fresh weight basis) for sweetpotatoes. Apios total carotenoids ranged …

Effect Of Temperature, Cell Concentration, And Split Dose Gamma Radiation On The Radiosensitivity Of Listeria Monocytogenes., Linda S. Andrews

LSU Historical Dissertations and Theses

Among food-borne pathogens, Listeria monocytogenes is one of the more resistant to food processing methods, including irradiation. USFDA approval for irradiation of processed meat and seafood products likely to contain Listeria spp. is $<$3 kGy gamma radiation. The incidence of L. monocytogenes in food products varies between 5-30% and at levels $<10\sp4$ CFU/g. With the capacity of this bacterium to multiply at refrigeration temperatures and the zero tolerance level mandated by the USFDA it becomes imperative to maximize the efficiency of the irradiation process. The first purpose of this study was to determine if initial cell concentration and/or temperature at time of irradiation influences the radiosensitivity of L. monocytogenes. Secondly, to determine whether split dose application would effect the radiation response of this bacterium. Concentrations of 10$\sp3,$ 10$\sp6$ and 10$\sp9$ cfu/ml of L. monocytogenes Scott A, were suspended in tryptic soy broth and exposed to 0-5 kGy gamma (1.25MeV) radiation at 20, 4, and -80$\sp\circ{\rm C}.$ Split doses were applied in equal portions to initial cell concentrations of 10$\sp6$ and 10$\sp9$ at the same temperatures. Surviving cells under the various conditions were enumerated and irradiation D-values were calculated from linear regression curves. At all temperatures, cell concentrations of 10$\sp3{\rm CFU/ml}$ were reduced to non recoverable levels with 2 kGy gamma radiation. The irradiation D-value of 0.43 kGy for frozen (-80$\sp\circ{\rm C})$ cultures of 10$\sp6$ CFU/ml was significantly lower (p $<$ 0.05) than the D-values (0.58 and 0.62 kGy) for the same cell concentration at the other two temperatures (20$\sp\circ$ and 4$\sp\circ{\rm C},$ respectively). For higher cell concentration of 10$\sp9$ cfu/ml, a D-value of 0.42 kGy was obtained for both 4$\sp\circ{\rm C}$ and -80$\sp\circ{\rm C}$ these were significantly lower (p $<$ 0.05) than 0.50 kGy for 20$\sp\circ{\rm C}$ suspensions. With both cell concentrations, the lowest D-values were obtained when cells were irradiated in the frozen state indicating a that primary cell damage was due to direct effects of irradiation. Split doses of 1 and 2 hours time between fractions approached the generation times for this bacterium and were significantly reduced at 20$\sp\circ{\rm C}.$ However, there was no consistent trend in reductions at 4$\sp\circ$ or -80$\sp\circ{\rm C}.$ Split dose application of irradiation to food pathogens should be further explored.

The Development And Evaluation Of Impedance Technology To Determine The Quality Of Shrimp And Catfish., Patti Lynn Wiese Lehigh

LSU Historical Dissertations and Theses

Impedance technology is currently used as a measurement of microbial activity. The purpose of the current study was to determine the feasibility of utilizing impedance technology to evaluate the quality of white shrimp (marine species) and channel catfish (freshwater species). Impedance analysis measurements (I-values) of raw shrimp increased for samples stored at 5, 25, and 35$\sp\circ$C; however, control samples stored at $-$20$\sp\circ$C displayed no significant changes in I-values. I-values from thermally processed shrimp had no direct relationship with odor scores, increased storage time, or increased storage temperature. It was concluded that while impedance measurements were able to indicate the degree …

Persistence Of The Ancient Regime: Custom Utility And The Common Law In The Nineteenth Century , Andrea C. Loux

Cornell Law Review

No abstract provided.

Fort Collins And The Cache La Poudre River: An Integrated Greenway Vision, Kari V. Henderson

Water Organizations in a Changing West (Summer Conference, June 14-16)

16 pages.

Contains references.

The Maine Progressive - Vol. 7, No. 9 : June 1993, Maine Progressive

The Maine Progressive

"If Maine is to be a more progressive society, people must make a commitment to work toward it. We hope that The Maine Progressive will broaden the base of support for progressive causes and bring together active people involved with many issues from all parts of Maine."
(from Vol.1, Issue 1)

Sustaining Agricultural Production In A Deregulated Economy, M. O. Ojo, E. D. Balogun, Grace O. Evbuomwan

Economic and Financial Review

This paper reviews the policy framework for Nigerian agriculture and gauges Its Impact prior to and since the commencement of economic deregulation. It investigates the prospects, analyses the constraints and outlines a feasible strategy for sustaining agricultural growth in a deregulated enabling environment 1he paper notes that in the pe1iod, 1970 to 1982, the deterioration in agricultural performance In Nigeria was the result not only of external shocks and environmental and/or edaphic factors, but of distorted policy pursuits which Created disincentives for farming. However, following attempts .to deregulate the economy with the adoption of the Structural Adjustment Programme in 1986 …

Some Strategies For Development Of Nigeria's Agricultural Sector In The 1990s, G. E. Ukpong

Economic and Financial Review

This paper reviews the major policy measures Introduced by the government to Induce growth of output of the agricultural sector and accelerate Its development. Some measures adopted before the Introduction of the Structural Adjustment Programme (SAP} Included producer prices selling through Marketing Boards, establishment of financial Institutions and Funds to extend credit to the sector at concessionary Interest rates, and the provision of extension services by ministries of agriculture. Agricultural policy measures under SAP consisted, among others, of abolition of Commodity Boards, free market determination of agricultural product prices, a ban on the export and Import of selected agricultural products …

Issues Shaping The Future Of Agricultural Law, Neil D. Hamilton

William Mitchell Law Review

No abstract provided.

Concerning The Promotion Of Sheep And Wool, And, In Connection Therewith, Enacting The "Colorado Sheep And Wool Authority Act"., Colorado General Assembly

Session Laws 1951-2000

No abstract provided.

Concerning The Promotion Of Beef, And, In Connection Therewith, Enacting The "Colorado Beef Council Authority Act"., Colorado General Assembly

Session Laws 1951-2000

No abstract provided.

Concerning Enactment Of The "Colorado Seed Act", And Making An Appropriation In Connection Therewith., Colorado General Assembly

Session Laws 1951-2000

No abstract provided.

G93-1183 Butterfly Gardening, Dale T. Lindgren, Stephen M. Spomer, Amy Greving

University of Nebraska-Lincoln Extension: Historical Materials

This NebGuide outlines planting schemes and arrangements that will help attract butterflies to a garden area.

Butterflies can be found in almost any part of Nebraska, from the Pine Ridge's coniferous forests and across the grasslands of the Sandhills to the deciduous forests along the Missouri River. Watching butterflies, much like bird watching or observing wildflowers has become a popular and enjoyable pastime. Since many natural butterfly habitats have been lost to urbanization and other development, some environmental organizations have incorporated butterfly conservation into their programs. Many people are taking a personal interest in attracting these fascinating insects to their …

G93-1191 Glossary Of Water-Related Terms, William L. Kranz, Delynn Hay, James W. Goeke, David Gosselin

University of Nebraska-Lincoln Extension: Historical Materials

This NebGuide is a glossary of water quantity, quality and human health related terms involving water. Terms are defined in contexts that could affect Nebraskans. We depend upon water for our very existence. The impact of water quality and quantity issues has never been greater. Yet the terminology used to describe the water we drink, the water we provide to plants and animals, the water stored underground, in lakes, rivers, and oceans, is not well understood by many Nebraskans. This listing of water-related terms is intended to reduce the potential for misunderstanding presentations made by elected officials, environmental agencies and …

G93-1150 Rinsing Pesticide Containers, Larry D. Schulze, Clyde Ogg

University of Nebraska-Lincoln Extension: Historical Materials

It is estimated that every year one million plastic agricultural pesticide containers are used in Nebraska. Effective rinsing of these containers saves money, protects the environment and meets federal and state regulations on pesticide use.

Proper rinsing of pesticide containers is easy to do, saves money and helps protect people and the environment. It also helps prevent potential problems with unrinsed containers and storage of the rinse solution (rinsate). Even during a busy season, the few extra minutes it takes to properly rinse empty pesticide containers is time well spent.

G93-1168 Moisture Testing Of Grain, Hay And Silage, Bruce Anderson, Rick Grant

University of Nebraska-Lincoln Extension: Historical Materials

This NebGuide offers methods to help producers test moisture content of grain, hay, silage and other feeds.

Knowing the moisture and dry matter (DM) content of feeds is important to farmers for several reasons:

1. Livestock performance depends on DM consumed; thus, DM content must be known to accurately formulate rations.

2. Knowledge of moisture content is needed for harvest decisions during haying and silage chopping and for safe storage of grains, hay, and silage.

3. Moisture content is a major factor related to the value, or price, of forages and grain.

Every producer should be able to test for …

G93-1180 Horn Fly Control On Cattle, John B. Campbell

University of Nebraska-Lincoln Extension: Historical Materials

This NebGuide identifies ways to control horn flies on cattle.

The horn fly is a blood-feeder that feeds 20 to 30 times per day. A population of several thousand horn flies may be present on one animal. When large numbers of these flies are on cattle, the cattle bunch and expend considerable effort fighting the flies. They will often stand in water or seek shade trying to get relief from the flies. When they do this, they fail to graze normally.

Studies in the United States and Canada show that during the grazing season yearling cattle free from horn flies …

G93-1158 Questions And Answers About Atrazine, Fred Roeth, S.D. Comfort

University of Nebraska-Lincoln Extension: Historical Materials

This NebGuide addresses some of the current concerns about atrazine and water quality. Included are some questions and answers about atrazine regarding toxicity, EPA guidelines, presence in water supplies, weed resistance and best management practices. What is atrazine? Atrazine is a herbicide that selectively controls broadleaf (dicot) weeds, such as pigweed, cocklebur, velvetleaf and certain grass weeds in fields of corn and sorghum. Selective control means that the target weeds are controlled, with little or no injury to the crop. Atrazine is well tolerated by actively growing corn and sorghum, which absorb and metabolize the herbicide and thereby detoxify it.

Effects Of Hematopoietic Neoplasia On Physiological Processes In The Soft-Shell Clam, Mya Arenaria (Linne), Mary-Susan Potts

Doctoral Dissertations

Mya arenaria (L.) is susceptible to the disease, hematopoietic neoplasia (Hn), in which atypical cells invade the blood and connective tissue of the clam's organs. In this study impacts of Hn on the reproductive and excretory systems were examined in clams collected from New Bedford Harbor and Little Buttermilk Bay, Buzzards Bay, MA.

The relationships between Hn seasonality and reproduction were evaluated from fresh blood samples and histological analysis of gonads. Both clam populations had biannual reproductive cycles with spawnings in the spring and fall. Hn prevalence exhibited some seasonality with maxima in the fall and late winter-early spring. Reproductive …

Characterization And Inheritance Of The Fused Vein Trait In Squash (Cucurbita Pepo L), Robert Bruce Carle

Doctoral Dissertations

This investigation characterized and determined the inheritance of the fused vein trait in Cucurbita pepo L. with the purpose of evaluating its use as a rouging marker for hull-less seeded cultivars.

The trait is characterized by the partial fusion of the primary leaf veins. There is a reduction in the intraveinal leaf blade and the dorsal leaf surface appears wrinkled. Depending on genetic background, fusion begins with the fourth to tenth leaf stage and continues throughout vegetative growth. The extent of fusion also varies from slight (1-5 cm) to pronounced (15-20 cm). Anatomically, fusion results from an interruption of vein …

Genetic And Molecular Analyses Of Host Symbiotic Genes And An In Vitro Regeneration System For Cicer Arietinum L, Vijayashri Ganapathy Paruvangada

Doctoral Dissertations

Ineffectively nodulating plant mutants PM405B, PM638A, and PM796B were used in molecular/genetic analyses of root nodule formation in chickpea. To establish the mode of inheritance of the mutant nodule phenotype in chickpea mutant PM638A, reciprocal crosses were made between PM638A and wild-type ICC640. The F$\sb2$ segregation data fit a 3 mutants: 1 wild-type monohybrid phenotypic ratio, indicating that ineffective nodulation is due to a monogenic dominant, nuclear mutation, tentatively designated as "Rn$\sb7$". Segregation analysis of F$\sb3$ progeny confirmed this model.

Early (ENod2) and late (Lb) nodulin cDNAs were used as heterologous probes to identify and study the expression of corresponding …

G93-1153 Stable Fly Control On Cattle, John B. Campbell

University of Nebraska-Lincoln Extension: Historical Materials

Control of stable flies in feedlots and dairy operations is covered here.

Description

The stable fly is about the size of a house fly but is dark gray and has dark irregular spots on its abdomen. The proboscis (mouthpart) protrudes bayonet-like in front of the head. The larvae are typical whitish fly maggots. The pupae are chestnut brown and about 1/4 inch long.

Lucas And Environmental Land Use Controls In Rural Areas: Whose Land Is It Anyway?, James B. Wadley, Pamela Falk

William Mitchell Law Review

No abstract provided.

Farm And Ranch Credit: Duty-Based Theories Of Lender Liability, Steven C. Bahls

William Mitchell Law Review

No abstract provided.