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A Study On The Growth Rate Of Brown Shrimp (Penaeus Aztecus Aztecus Ives, 1891) From The Coasts Of Veracruz And Tamaulipas, Mexico, Ernesto A. Chávez

Gulf and Caribbean Research

The present study was undertaken with the purpose of getting the proper basis for exploiting brown shrimp resources in a rational manner, by introducing control regulations of fishing activities. The growth rate models are necessary for the other parameters of population dynamics of the stocks of this species, whose annual catch, Osborn, Maghan and Drummond (1969), averages 54 million pounds of tail weight, representing 52% of the total shrimp caught in the Gulf of Mexico. This shows that Penaeus aztecus aztecus is the most important of shrimp species exploited in this region. Nevertheless, the brown shrimp is the least well …

Effect Of Amino Acids On Non-Protein Nitrogen Utilization By G-F Swine, P. D. Platter, E. R. Peo, Jr., P. E. Vipperman, P. J. Cunningham

Department of Animal Science: Faculty Publications

Two metabolism and one feeding experiment were conducted with a total of 118 crossbred pigs to determine the effect of amino acids on non-protein nitrogen (NPN) utilization by G-F swine.

G73-30 The Alfalfa Weevil (Revised May 1989), Stephen D. Danielson, David L. Keith, George Manglitz

University of Nebraska-Lincoln Extension: Historical Materials

The alfalfa weevil is the primary insect pest of alfalfa in Nebraska. Management is essential during years when weevil infestations are high.

Damage from the alfalfa weevil can be severe. The life cycle of this pest and methods of managing it are discussed in this publication.

Natural Control Of Insect Pests On The Ord?, P J. Michael

Journal of the Department of Agriculture, Western Australia, Series 4

Current trials conducted by the Department of Agriculture at Kununurra are indicating that there may be an important place for biological control of insect pests of the Ord River Irrigation Area.

Gain, Feed Conversion And Carcass Traits Of Swine Fed Under Two Nutritional Regimes, P. J. Cunningham, T. E. Socha, E. R. Peo, Jr., R. W. Mandingo

Department of Animal Science: Faculty Publications

Data involving 505 Gene Pool boars, barrows and gilts and 126 Hampshire boars and gilts fed two nutritional diets were presented. One diet consisted of high lysine corn, minerals and vitamins (10% protein) while the other diet was a 14% protein corn-soy diet.

The Effect Of Aflatoxin B1 On Growth Rate And Iron Metabolism In Juvenile Mongolian Gerbils (Meriones Unguiculatus), William Stanley Hastings Jr.

Theses and Dissertations

The metabolic secretions from Aspergillus flavus, aflatoxins. are often found as contaminants of agricultural products used for human and animal consumption. Aflatoxin B1 is the most toxic and carcinogenic of the aflatoxins. A reduction in weight gain has been observed when juvenile animals are fed aflatoxin B1 over an extended period of time. This reduction in weight gain may possibly result from an anemic condition induced by an alteration of iron absorption and/or distribution. The effect of chronic sublethal levels of this hepatocarcinogen on weight gain and the uptake and distribution of 59Fe++ were studied in this investigation.

An experimental …

The Vitamin E Status Of Lactating Dairy Cows After Receiving Stored Feeds For 15 Months, Marc Dellhime Eckhart

Electronic Theses and Dissertations

The trend in dairying in recent years has been towards more confinement housing and higher producing animals. Such confinement housing often leads to year-around feeding of stored feeds, such as silage, haylage, and hay with no pasture grazing or feeding of freshly cut forages. Since stored feeds contain substantially less vitamin E than those same forage when freshly cut or grazed, it may be important to re-evaluate the vitamin E status of cows fed stored feeds continuously. The requirement of cattle for vitamin E are largely unknown. The one study involving adult cattle, conducted 25 years ago, found that 1.82 …

The Eriophyoidea Of South Dakota, Magdalena Lopez Briones

Electronic Theses and Dissertations

This paper presents the results of the taxonomic investigation of the Eriophyoidea in South Dakota. Information is given on the morphology, discussion of variation within a population, distribution, damage in host plants, economic importance and techniques of collecting and preparing specimens. There are 42 previously described species included in this study. Of the 48 species studied, six are new. Species described are: Aculops maximilianae, Diptacus pengsonae, Eriophyes arceosae, Eriophyes taylori, Tegonotus lindenus, and Tetra mcdanieli.

The Role Of Nematodes In A South Dakota Grassland Ecosystem, James D. Smolik

Electronic Theses and Dissertations

In an attempt to elucidate the role of nematodes in a grassland ecosystem nematode taxa, number and biomass data was gathered over a three year period at the Cottonwood International Biological Program Grassland Biome site in western South Dakota. The effects of grazing intensity, sampling date and sampling depth were studied. Nematicide treatment of range grasses in field and greenhouse studies was also used to evaluate the role of nematodes. Biomass data was used to estimate the intake of plant feeding nematodes. Results obtained demonstrate that soil inhabiting nematodes constitute a significant proportion of the consumer biomass at the Cotton[1]wood …

Biology Of The Flea Beetle, Altica Carduorum Guer. (Coleoptera: Chrysomelidae) On Canada Thistle, Cirsium Arvense (L.) Scop., In South Dakota, Burton Danis Schaber

Electronic Theses and Dissertations

A laboratory colony of Altica carduorum Guer. was established from a stock colony of 50 adult beetles. They had an average previposition period of 7 days when exposed to a regular cycle of 16 hr. of light (24° C) and 8 hr. of darkness (12.75° C). Under these conditions, females laid an average of 259.3 ± 9.7 eggs, and longevity averaged 100 days. The eggs are laid on the underside of leaves along edges of leaf veins throughout June. Adults fed and overwintered in the soil, and some beetles emerged the following spring and laid viable eggs. Laboratory studies indicate …

Application Of 125i To The Detection And Assay Of Viruses And Viral Antibody Adsorbed To Latex Particles, Charles Steven Duvall

Electronic Theses and Dissertations

This study, then, was undertaken to develop a universal, in vitro, extracellular method utilizing fluorescence and radioactive ¹²⁵I to rapidly detect, identify, and quantitate pathogenic viruses and viral antibodies. Focus of the study is the CLAM model, which consists of inert latex particles, plus four radioactively labeled components: antibody, virus, enzyme (RNase) and fluorochrome (FITC).

Comparative Study Of The Photopositive Coleoptera Of The Embarras River Floodplain And Upland Ridge, Ann Decker

Masters Theses

No abstract provided.

Studies On Muropeptide Amino Acids Of Rhizobium Japonicum, Mohammed Alauddin

Masters Theses

The isolation of Rhizobium japonicum cell walls was performed by ultrasonication and the enzymatic digestion with DNase, RNase and pronase separately. Crude cell walls were washed with M NaCl and 5% SDS and were isolated by 20,000 g centrifugation. Muropeptide amino acids were freed by hydrolysis at 121C for 10 minutes in 6N HCl.

Detection of Rhizobium japonicum murein layer amino acids was done by 2-dimensional instant thin layer chromatography on silica gel plates. The solvents found most favorable, were n-butanol: acetic acid: water and n-propanol: 34% ammonium hydroxide. Amino acid spots were developed by spraying ninhydrin on the chromatograms, …

A Survey Of Ectoparasites From Microtus Ochrogaster Ochrogaster (Wagner), Peromyscus Leucopus Noveboracensis (Fisher), And Cryptotis Parva Harlani (Say), Fred Basolo Jr.

Masters Theses

Ectoparasites were taken from 50 white footed deer mice, Peromyscus leucopus noveboracensis (Fisher), 50 prairie voles, Microtus ochrogaster ochrogaster (Wagner), and 11 least shrews, Cryptotis parva harlani (Say), within a five mile radius of Charleston, Illinois from 23 January 1973 through 25 June 1973. A total number of 4,242 ectoparasites were recovered; 2,395 from Microtus ochrogaster, 542 from Peromyscus leucopus, and 1,305 from Cryptotis parva. The major groups of ectoparasites and their percent recovery were: Acari (excl. of Metastigmata) 81.50%, Metastigmata 2.95%, Anoplura 15.50% and Siphonaptera 0.50%. A study of the ectoparasites recovered revealed representatives of 18 …

Gastro-Intestinal And Abdominal Helminths Of White-Tailed Deer (Odocoileus Virginianus) From Carroll And Jo Daviess Counties In Northern Illinois, Jeffrey Joseph Hodge

Masters Theses

Forty-four white-tailed deer shot by hunters in November and December, 1971, in Carroll and Jo Daviess counties in northwestern Illinois were necropsied for gastro-intestinal and abdominal helminths. Five species of gastro-intestinal nematodes were found: Gongylonema pulchrum, Ostertagia odocoilei, Haemonchus contortus, Trichuris ovis and Nematodirus sp. Setaria yehi, a filiariad nematode, was found in the abdominal cavity. Moniezia benedeni was the only cestode found. No trematodes were recovered. Differences in numbers and kinds of parasites found in northern Illinois and southern Illinois are discussed. Prevalence increased with host age for certain species of parasites and decreased or …

The Effects Of Acute Stress On Adrenal Ascorbic Acid Levels, Robert Joseph Collier

Masters Theses

The diurnal rhythm of adrenal ascorbic acid (DAR) displays an inverse relationship to the diurnal rhythm of circulating levels of plasma corticosteroids. Alloxan monohydrate, 175 mg/kg body weight was given subcutaneously to albino rats to determine the effect of the diabetic state on the DAR. A total of 200 female albino rats were divided into two study groups. Study Group I was composed of 150 animals divided into populations of 15, each including 3 controls. Study Group II was composed of populations of 5, each group containing all controls or all alloxinated rats. The populations of 15 were sacrificed at …

A Survey Of The Insect Fauna Of Canada Thistle, Cirsium Arvense, In South Dakota; And Studies Relating To Biological Control By Ceutorhynchus Litura And Cassida Rubiginose, Lance Jerome Nearman

Electronic Theses and Dissertations

A total of 121 indigenous insect taxa representing 9 orders, 64 families, 103 genera and 118 species was collected from Canada thistle (Compositae: Cirsium arvense (L.) Scop.) in South Dakota during 1970 through 1973. This survey identified the major phytophagous and entomophagous insect fauna associated with this noxious weed. The common phytophagous species observed feeding on thistle were all polyphagous and failed to control Canada thistle below the economic level. Field cage releases of adult Ceutorhynchus litura (F.) weevils were made on a thistle infested pasture site located in east central South Dakota during 1972-1973. Ninety-nine weevils were released in …

The Ecological Role Of Fire In The Jackson Hole Area, Northwestern Wyoming, L.L. Loope, G.E. Gruell

Aspen Bibliography

No abstract provided.

Grass-Woody Plant Relationships, A.W. Bailey, R.K. Gupta

Aspen Bibliography

No abstract provided.

Processing Methods For Corn Grain Fed With Various Types, Sources And Levels Of Roughage To Cattle, Jerry Burkhardt

Electronic Theses and Dissertations

The research reported in this thesis involved experiments to determine the value of grain processed by various methods when fed various kinds and ratios of concentrate to roughage to feedlot beef animals of various ages and degree of fatness.

The Effects Of Ultraviolet Irradiation On The Pigment Cells Of The Pet/Wmr Mouse Epidermis, Vaughan Henry Howard Jr.

Master's Theses

Epidermal melanocytes in mammals are known to occur in a variety of shapes, sizes, and colors. The basic melanocyte morphology is dependent upon genetics, but there are a number of environmental factors that can cause modification.

In the epidermis of PET/\vrnr mice, the population of rnelanocytes reaches a peak and begins to decline during the first post-natal week, and has disappeared within four weeks. Dispersed among the large, highly DOPA-reactive melanocytes are miniature melanocytes. These miniature melanocytes are weakly DOPA-reactive and appear early in the post-natal period. The miniature melanocyte population is relatively constant and these miniature cells are among …

A Study Of The Effects Of Changing Environmental Salinity Upon The Prolactin Cells In A Freshwater Teleost, Xiphophorus Maculatus (The Platyfish), Seymour Holtzman

Dissertations, Theses, and Capstone Projects

No abstract provided.

Critical Flicker Frequency In A Harp Seal, Pagophilus Groenlandicus (Erxleben, 1777), Charles D. Bernholz

University of Nebraska-Lincoln Libraries: Faculty Publications

Critical flicker frequency (CFF) in a free-swimming harp seal (Pagophilus groenlandicus) was investigated using behavioral techniques. The resulting CFF versus intensity contour indicates a definite rod-cone break, confirming a duplex photoreceptor population whose presence had not been observed in previous morphological reports.

The Bobwhite Quail, Norm Dey, Jack Sinn

Nebraska Game and Parks Commission: Publications

A Year with the Bobwhite

Population Dynamics—Managing the Variables

The Way to Quail Abundance

The Ring-Necked Pheasant In Nebraska, William L. Baxter, Carl W. Wolfe

Nebraska Game and Parks Commission: Publications

Ringneck—Its Past and Prospects: A most successful exotic, pheasant numbers are declining

Nuptial Rites and Nesting: Spring recoups winter’s losses

Summer Broods: While cocks undergo their annual moult, hens enter the brooding period; for eight weeks, hens attend chicks

Hunting the Ring-necked Pheasant

Season of Testing: Nebraska’s winters test a pheasant’s mettle, but given good cover and an adequate food supply, the ringneck is almost impervious to the elements

Methods of Management

Life History And Ecology Of The Ring-Necked Pheasant In Nebraska, William L. Baxter, Carl W. Wolfe

Nebraska Game and Parks Commission: Publications

Table of Contents

The Study … 6

Population Studies … 8 ...

Methods … 8 ...

Results and Discussion … 9

Nesting Studies … 13 ...

Methods … 13 ...

Results and Discussion … 14 ...

Nest Parasitism … 16 ...

Effects of Nest Searching on Nest Fate ... 17 ...

Nesting Chronology ... 18 ...

Roadside Nests ... 21 ...

Nesting in Experimental Alfalfa ... 22 ...

Pheasant Production in Wetlands ... 23

Brood Studies … 26 ...

Methods ... 26 ...

Sampling Problems ... 26 ...

Results and Discussion ... 27

Cover Utilization by Pheasant Broods ... 29 …

America's Systematics Collections: A National Plan, Howard S. Irwin, Willard W. Payne, David M. Bates, Philip S. Humphrey, Belmont Writing Committee

University of Nebraska State Museum: Programs Information

"America's Systematics Collections: A National Plan'' is a report to the nation's systematics collections community, and includes a National Plan for the recognition and development of systematics coilections as an important national resource in the United States. The report states the goals of the systematics collections commnnity, and documents the importance of systematics coliections to science, society and education. The problems of the systematics collections community are identified and discussed. Recommendations are presented that, if implemented, could permit the systematics coiiections community to achieve its goals; the recommendations are reiterated within a framework of prioritiei. Eitimated new Support required by …

The Occurrence Of The Remarkable Scyphozoan, Deepstaria Enigmatica, In The Gulf Of Mexico And Some Observations On Cnidarian Symbionts, Philip J. Phillips

Gulf and Caribbean Research

On 8 July 1965 one damaged specimen of the remarkable scyphozoan, Deepstaria enigmatica Russell 1967, was taken in the course of a sampling program conducted by the Department of Oceanography, Texas A&M University in a ten-foot Issacs-Kidd midwater trawl in the Yucatan Basin. The trawl was put into water at Lat. 19" 58' N, Long. 85" 14' W. This is the first report of Deepstaria in the Atlantic region. This medusa is otherwise known only from the Pacific Ocean where it has been captured by slurp gun from the submersible Deepstar over the San Diego Trench and has been taken …

Experimentally-Induced Muscle Atrophy In The Developing Chick Embryo: Glycogen Metabolism, Michael J. Harris

Journal of the Minnesota Academy of Science

Glycogen content and the activities of phosphorylase (PHRL) and glycogen synthetase (GS) in the hind limb muscle of normal, unilaterally (right) - denervated and in nicotine sulfate (NS) - injected chick embryos were determined to assess the effect of the experimental treatments on glycogen metabolism. Glycogen content increased with increase in age in normal limbs, remained relatively low in denervated limbs, increased with age in left (unoperated) limbs of denervated embryo limbs at a rate lower than normal except between days 13 and 17 of incubation, when glycogen content tripled. The same parameter in NS-injected embryo limbs remained generally low …

Organization Of The Primary Body In The Root Of Cyclamen Persicum Mill, Marshall D. Sundberg

Journal of the Minnesota Academy of Science

The primary body of the root of Cyclamen persicum Mill. is described. The rootcap consists of two components of separate origin. Cells of the columella are derived from the dermatocalyptrogen by periclinal wall formation. Further growth of the columella is due primarily to the increase in size of existing cells. Cells of the lateral rootcap arise from the protoderm by periclinal wall formation. Continued growth in this region is due to both increase in cell number and increase in size of existing cells. Proximal to the dermatocalyptrogen is the presumptive quiescent center. Around the periphery of this zone are located …