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Genotype X Environment Interaction For Growth And Reproductive Traits In Beef Cattle., Louis Munyakazi Jan 1991

Genotype X Environment Interaction For Growth And Reproductive Traits In Beef Cattle., Louis Munyakazi

LSU Historical Dissertations and Theses

Data on eight different two breed combinations of calves produced in two locations (Louisiana and Nebraska) were analyzed to determine the magnitude of genotype x location interactions for gestation length (GESTLEN), birth weight (BWT), pre-weaning average daily gain (ADG) and weaning weight (WWT). Sire breed (SB), sire/SB and cow breed (CB) interactions with location (LOC) were the primary sources of variation of interest in the analysis of variance. The SB x LOC interaction was significant for all traits whereas the CB x LOC interaction was important only for ADG. The sire/SB x LOC interaction accounted for a significant amount of …

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In Vitro Culture Of Bovine Uterine And Oviduct Epithelial Cells., John Kevin Thibodeaux Jan 1991

In Vitro Culture Of Bovine Uterine And Oviduct Epithelial Cells., John Kevin Thibodeaux

LSU Historical Dissertations and Theses

A reliable procedure was developed to harvest purified populations of bovine uterine epithelial cells from the luminal endometrium that allowed cells to be maintained in vitro for multiple subpassages. This method allowed adequate numbers of cells for in vitro culture studies to evaluate uterine secretion rates, uterine-embryo interactions and a new embryo co-culture system. In a second study, cells were isolated from the uterus and oviducts collected from cattle on day of estrus, on d 4 to 6, d 8 to 10 and d 14 to 16 of the cycle to monitor growth and development following incubation in vitro. The …

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Environmental Factors And Production Characteristics Affecting The Culture Of Red Drum, Sciaenops Ocellatus., Rowland Glenn Thomas Jan 1991

Environmental Factors And Production Characteristics Affecting The Culture Of Red Drum, Sciaenops Ocellatus., Rowland Glenn Thomas

LSU Historical Dissertations and Theses

Experiments with red drum, Sciaenops ocellatus, were conducted to assess environmental requirements and culture characteristics. Pond trials were used to evaluate the effects of salinity, chloride source, predator control, acclimation procedure, stocking density, and size at stocking on production. Survival in individual ponds ranged from 0-92%; average daily weight gain from 0.46-2.22g; and feed conversion ratio from 2.30-4.90. Survival, growth, and feed conversion ratio did not differ significantly between equivalent treatments in saltwater and freshwater ponds. The minimum chloride concentration necessary for acceptable production of red drum in freshwater ponds (250-300 mg/l) was at least 100% higher than the concentrations …

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Characterization And Potential Utilization Of Proteases From The Hepatopancreas Of Crawfish, Procambarus Clarkii., Hyeung-Rak Kim Jan 1991

Characterization And Potential Utilization Of Proteases From The Hepatopancreas Of Crawfish, Procambarus Clarkii., Hyeung-Rak Kim

LSU Historical Dissertations and Theses

Four electrophoretically homogenous anionic trypsins, tentatively named trypsin A, B, C, and D, were isolated from crawfish hepatopancreas. Purity was increased 56, 100, 87, and 64-fold with approximately 2.4, 8.1, 5.1, and 3.0% yield for trypsin A, B, C, and D, respectively. The molecular weights of trypsin A, B, C, and D were estimated to be 23,800, 27,900, 24,800, and 31,400, respectively, using Sephacryl S-200 gel filtration. Isoelectric points and amino acid profiles of the trypsins were similar. Caseinolytic activity was consistently highest between pH 5.5 and 10.0 for all trypsins. Amidolytic and esterolytic activities were maximum in a narrower …

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Effects Of Alternative Protein And Fat Payment Plans On Production Variables And Returns In Louisiana Dairy Herds., Leonder Labbe Jan 1991

Effects Of Alternative Protein And Fat Payment Plans On Production Variables And Returns In Louisiana Dairy Herds., Leonder Labbe

LSU Historical Dissertations and Theses

Multiple linear regression was used to compare the impact of proposed multiple component milk pricing systems with the present milk pricing system for Louisiana Holstein herds on DHIA. Dependent variables were milk yield, fat yield, protein yield, six income over feed cost pricing systems, and six product value pricing systems. Independent variables were herd, year, and month as class variables and 18 production variables. Data were 16,675 herd-year-month observations of Louisiana Holsteins from DHIA monthly Herd Summary DHI-202 computer files. Pricing data was standardized using prices form the New Orleans - Mississippi Federal Milk Marketing Order 1094, Zone 1. The …

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Chromium, Tryptophan, And Picolinate In Diets For Pigs And Poultry., Timothy Guinn Page Jan 1991

Chromium, Tryptophan, And Picolinate In Diets For Pigs And Poultry., Timothy Guinn Page

LSU Historical Dissertations and Theses

Six experiments were conducted to evaluate the effects of supplemental dietary tryptophan (TRP), picolinate (Pic), CrCl$\sb3\cdot$6H$\sb2$O, chromium picolinate (CrPic), or a combination of Pic and CrCl$\sb3\cdot$6H$\sb2$O on growth performance, liver mineral concentrations, insulin, growth hormone, organ weights, and serum and carcass traits of pigs. One experiment was conducted to evaluate the effect of chromium picolinate (CrPic) on serum cholesterol (CH), egg CH, egg quality, and egg production of laying hens. Dietary TRP, Pic, CrCl$\sb3\cdot$6H$\sb2$O, and a combination of Pic and CrCl$\sb3\cdot$6H$\sb2$O did not affect growth performance, liver mineral concentrations, insulin, growth hormone, and serum and carcass traits of pigs. The …

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Ruminal Distribution And Utilization Of Zinc And Magnesium As Influenced By Dietary Source And Energy Level., Donald Wayne Kennedy Jan 1991

Ruminal Distribution And Utilization Of Zinc And Magnesium As Influenced By Dietary Source And Energy Level., Donald Wayne Kennedy

LSU Historical Dissertations and Theses

Steers fed a conventional diet were utilized to determine the effects of various Zn supplements on ruminal distribution of Zn. Treatments consisted of a basal (B) diet (no Zn supplementation) and B supplemented with equal parts of Zn from either a polysaccharide complex of Zn (PC-Zn) or zinc oxide (ZnO). Samples were fractionated into four fractions: a cell-free fraction, a particulate fraction and two microbial fractions. After PC-Zn or ZnO were dosed intraruminally, relative distribution of Zn from each Zn source within each fraction was evaluated up to 8 h postdosing. Cannulated growing lambs were used to study the effects …

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The Challenges Of An American Symbol : Family Farming--Past, Present, And Future, Sandra K. Ridl Jan 1991

The Challenges Of An American Symbol : Family Farming--Past, Present, And Future, Sandra K. Ridl

Undergraduate Theses and Senior Projects

No abstract provided.

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The Better Life Programme And The Rural Economy Of Nigeria, Central Bank Of Nigeria, Research Department Sep 1990

The Better Life Programme And The Rural Economy Of Nigeria, Central Bank Of Nigeria, Research Department

Economic and Financial Review

This study has attempted to assess the impact of the Better-Life-Programme (BLP) on the rural economy. The findings showed that despite the short period of its existence, the Programme has attracted notable attention and patronage by all and sundry.

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Application Of Fuzzy Set Technique To Agricultural Planning, S Kumar, Narasingh Misra, B C Ghosh Jun 1990

Application Of Fuzzy Set Technique To Agricultural Planning, S Kumar, Narasingh Misra, B C Ghosh

IIMB Management Review

In India, agriculture remains the dominant sector of economic activity with 74 percent work force depending on it. But the share of income from agriculture sector is less than the employment in it. Also the menace of unemployment and food requirement is increasing with growing population. Hence , there is a great need for increasing production and net profit levels on one hand and employment generation on the other. Irrigation planning plays an .mportant role in increasing agricultural production, net benefit, employment generation etc. as only 32 percent of the total cultivated area is irrigated in our country. Irrigation Planning …

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Genetic Variability And Population Structure Of Eastern White Pine In A Two Hectare Stand, Durham, New Hampshire, Petr R. Brym Jan 1990

Genetic Variability And Population Structure Of Eastern White Pine In A Two Hectare Stand, Durham, New Hampshire, Petr R. Brym

Doctoral Dissertations

The genetic structure of a two hectare stand of eastern white pine (Pinus strobus L.) was studied by relating foliar allozyme composition of individual trees to tree location and age. Using starch gel electrophoresis, the trees were found to have variants for six of the seven enzymes analyzed. Trees of similar age and with common allozymes were found in clusters, suggesting that genetic structure existed in the stand. The genetic structure may have originated during establishment of several seedlings from common parents when openings were created in the canopy. Knowing that a genetic structure, such as that observed in this …

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Rp367 Strategies For Feeding The Ewe Flock, R.M. Jordan Jan 1990

Rp367 Strategies For Feeding The Ewe Flock, R.M. Jordan

University of Nebraska-Lincoln Extension: Historical Materials

This publication covers the strategies of feeding the ewe flock from aspects to consider and problems likely to be encountered, useful feed consumption data, characteristics of feedstuffs for sheep, pastures, mineral deficiencies and toxicities, and feeding the ewe.

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Effects Of Gel Teat Cleaning And Sanitizing On Raw Milk Quality And Udder Health., Kasimu Hudu Ingawa Jan 1990

Effects Of Gel Teat Cleaning And Sanitizing On Raw Milk Quality And Udder Health., Kasimu Hudu Ingawa

LSU Historical Dissertations and Theses

Thirty lactating Holstein cows were divided into three groups of ten each and assigned to three treatments. The first treatment required using a gel teat sanitizer cleaner (GEL) and paper towels, no water to clean teats prior to milking. The second used only water (WASH) and paper towels, and the third used water, paper towels, and predipping (PREDIP) with 0.5% iodophor solution. Individual cow samples of milk were aseptically collected weekly from weigh jars for ten weeks. Bacteria counts were determined. Microorganism counts were also monitored from individual cow teat swabs. Treatment effects on daily milk yield, fat and protein …

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Effects Of Artificial Mineral Licks On White-Tailed Deer., Stephen Redmore Schultz Jan 1990

Effects Of Artificial Mineral Licks On White-Tailed Deer., Stephen Redmore Schultz

LSU Historical Dissertations and Theses

A commercial mineral mixture for deer was used to evaluate the effects of broad-spectrum dietary mineral supplementation on white-tailed deer (Odocoileus virginianus) growth, antler development, and tissue mineral content. Forty-two artificial mineral licks for deer were established on 3 study areas in East Feliciana Parish, Louisiana. All licks were monitored monthly, recharged to original level if used, and mineral consumption recorded from May 1988 through December 1989. Consumption data were converted to estimated average per deer values based on population estimates. Effects of artificial lick mineral consumption on free-ranging deer were examined by comparing deer harvested during the 1988-89 and …

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Effects Of Food Plots On Selected Growth Parameters, Productivity, And Harvesting Of White-Tailed Deer In A National Forest., Kenneth Dale Dancak Jan 1990

Effects Of Food Plots On Selected Growth Parameters, Productivity, And Harvesting Of White-Tailed Deer In A National Forest., Kenneth Dale Dancak

LSU Historical Dissertations and Theses

A total of 8.1 ha of warm-season and 16.8 ha of cool-season food plots were installed on 2 of 4 study units at National Red Dirt Wildlife Management Preserve, Louisiana, an area managed by the USDA Forest Service for multiple resources. Mean ($\pm$ s.e.) study unit size was 2220 $\pm$ 246 ha. No food plots were installed on the remaining 2 study units (controls). Warm-season food plots were planted with American jointvetch (Aeschynomene americana); cool-season plots were planted with red clover (Trifolium pratense), subterranean clover (Trifolium subterraneum), winter wheat (Triticum aestivum) and white clover (Trifolium repens). All plots were maintained …

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Sampling And Analysis Of Dynamic Headspace Volatile Compounds From Selected Protein-Rich Food Matrices., Jose Ernesto Matiella Jan 1990

Sampling And Analysis Of Dynamic Headspace Volatile Compounds From Selected Protein-Rich Food Matrices., Jose Ernesto Matiella

LSU Historical Dissertations and Theses

Volatile compounds from two protein-rich foods, crabmeat and eggs, were studied with emphasis on qualitative and quantitative determination of a wide variety of chemical substances including degradation compounds from amino acids, lipids and carboyhdrates as well as compounds derived from the packaging material and the environment. Boiled and pasteurized blue crab (Callinectes sapidus) meat samples were analyzed for volatile flavor components by dynamic headspace sampling, capillary column gas chromatography and mass spectrometry. Fifty-three volatile compounds were identified in crabmeat samples. Levels of volatile compounds in both samples were compared and it was found that the boiled crabmeat contained higher levels …

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Predicting Potassium Uptake By White Clover With A Mathematical Model And Assessment Of White Clover Phosphorus And Potassium Status With The Dris., Hubert Joseph Savoy Jr Jan 1990

Predicting Potassium Uptake By White Clover With A Mathematical Model And Assessment Of White Clover Phosphorus And Potassium Status With The Dris., Hubert Joseph Savoy Jr

LSU Historical Dissertations and Theses

Environmental concerns emphasize the requirement for diagnostic tools compatible with more intensively managed agricultural systems. Two recent approaches, the Barber-Cushman mechanistic model and the Diagnosis and Recommendation Integrated System (DRIS), appear to offer more accurate predictions of soil nutrient supply and more flexible means of assessing plant nutrient status, respectively, than conventional methods. The objectives of this research were to verify the aforementioned models for predicting K uptake and assessing P and K status of LA S-1 white clover. In growth chamber experiments, the Barber-Cushman model correctly predicted K uptake by plants for up to 21 days from Rita muck, …

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Regulation Of Cortisol And Prolactin In Horses., Donald R. Colborn Jan 1990

Regulation Of Cortisol And Prolactin In Horses., Donald R. Colborn

LSU Historical Dissertations and Theses

In Experiment I, stallion exposure to an estrous mare on d 2 caused cortisol and PRL concentrations to increase (P $$.05) on d 1, 3, 4, 5 or 6 when no exposure occurred. In Experiment II, cortisol concentrations increased (P $<$.05) within 10 min after sexual stimulation (SS), physical exercise (PE), restraint via a twitch (RT) and epinephrine administration (EA) but not during control bleedings. PRL concentrations increased (P $<$.05) following SS, PE and RT but not after EA or during control bleedings. In Experiment III, cortisol concentrations in geldings increased (P $<$.05) following EA, PE and RT but not following SS or control bleedings. PRL concentrations increased (P $<$.05) following PE and SS. In Experiment IV, sulpiride injection was used in stallions in an attempt to increase PRL concentrations. Prior to sulpiride treatment, concentrations of both cortisol and PRL increased (P $<$.05) by 40 to 80% in response to exercise; concentrations of LH and FSH also increased (P $<$.05) by approximately 10%. Sulpiride treatment stimulated (P $<$.05) daily PRL secretion by approximately 5-fold, and caused a decrease (P $<$.05) in daily FSH secretion whereas only isolated differences (P $<$.05) occurred between treatment groups for daily LH and cortisol secretion. At the end of treatment, there was no PRL response to exercise for stallions treated with sulpiride, but there was (P $<$.05) for control stallions; only control stallions exhibited a marginal cortisol response (P $<$.05) to exercise. The PRL response to TRH was increased (P $<$.05) 4-fold in stallions treated with sulpiride but was unchanged in control stallions. Sulpiride treatment did not affect (P $>$.05) the LH or FSH response to exogenous GnRH. We conclude that: (1) returning stallions to the site of a previous period of sexual excitement does not cause a memory-mediated rise in cortisol or prolactin; (2) cortisol and PRL are secreted rapidly in response to some but not all forms of physical and chemical stress in stallions and geldings; …

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Factors Affecting Conceptus Loss In Cattle., Daniel Patrick Ryan Jan 1990

Factors Affecting Conceptus Loss In Cattle., Daniel Patrick Ryan

LSU Historical Dissertations and Theses

In the first experiment, the temperature humidity index (THI) was compared with pregnancy rates (PR) in bovine females under two different environmental cooling systems. The PR decreased if the THI was greater on the second day prior to or after mating compared with that of the day of mating. In the second experiment, the stages of embryo mortality in the first 40 days of gestation were identified in the hot and cool seasons of the year. At day 13 or 14 of pregnancy 27% of embryos were viable in the hot months, which was less than 60% at day 13 …

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Influence Of Storage Temperature And Duration On Deterioration Of Film-Wrapped And Non-Wrapped Mustard, Brassica Juncea Coss., Regina Poillion Bracy Jan 1990

Influence Of Storage Temperature And Duration On Deterioration Of Film-Wrapped And Non-Wrapped Mustard, Brassica Juncea Coss., Regina Poillion Bracy

LSU Historical Dissertations and Theses

Mustard "greens' is a popular fresh vegetable, especially in the South. Fresh market production, however, is restricted to local sales or short-distance markets due to the relatively short shelf life of mustard. Packaging has been shown to successfully extend the shelf life of several fruits and vegetables. To determine the effect of packaging and storage temperature on the postharvest life and quality of mustard, mustard was stored at 1, 4, and 15C in perforated polyethylene bags, Cryovac D-955 60-gauge or 100-guage heat-shrinkable films or not-wrapped. A preliminary experiment was conducted with spinach to develop experiment methodology and for comparison of …

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Estimation Of Additive And Heterotic Direct And Maternal Genetic Effects For Carcass Traits In Beef Steers., Sidney Marc Derouen Jan 1990

Estimation Of Additive And Heterotic Direct And Maternal Genetic Effects For Carcass Traits In Beef Steers., Sidney Marc Derouen

LSU Historical Dissertations and Theses

Carcass measurements were taken on straightbred and crossbred steers to estimate least squares means and heterosis (1,494 steers) and, to partition additive and heterotic genetic effects (1,536 steers) on hot carcass weight (HCWT), retail yield (YIELD), ribeye area (REA), fat thickness (FT), marbling score (MS) and Warner-Bratzler shear (WBS). Steers were produced over four generations in a rotational crossbreeding study and consisted of Angus (A), Brahman (B), Charolais (C) and Hereford (H) breeds. Two-, three- and four-breed rotation systems were generated with the restriction that each breed combination include the B. Straightbreds were maintained as controls. Treatment, mating system and …

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Studies On Important Volatile Flavor Components In Louisiana Rangia Clam (Rangia Cuneata)., Uraiwan Tanchotikul Jan 1990

Studies On Important Volatile Flavor Components In Louisiana Rangia Clam (Rangia Cuneata)., Uraiwan Tanchotikul

LSU Historical Dissertations and Theses

Important flavor components in Louisiana brackish water clam (Rangia cuneata) were investigated in this dissertation research. Major achievements include: (1) positive identification of the major compound responsible for the objectionable musty/earthy off-flavor in the clam, (2) development of quantitative method to compare the levels of the off-flavor compound in clam samples before and after relaying, and (3) identification of desirable characteristic clam volatile flavor components. The identification of the musty/earthy off-flavor of rangia clam was accomplished by using dynamic headspace sampling (DHS) coupled with high resolution gas chromatography/mass spectrometry (HRGC/MS) in selective ion monitoring (SIM) mode and HRGC aroma perception. …

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Using The Domestic Chicken Egg For Culturing Preimplantation Mammalian Embryos., Eldred Griffin Blakewood Jan 1990

Using The Domestic Chicken Egg For Culturing Preimplantation Mammalian Embryos., Eldred Griffin Blakewood

LSU Historical Dissertations and Theses

A novel embryo culture system has been developed using 96-hour chick embryos. One to four mammalian embryos can be injected into the chick embryo amnion (CEA) and allowed to develop for 72 to 96 hours. Pronuclear-stage mouse embryos from two different strains were cultured in the CEA or in Whitten's medium. There were more expanded blastocysts from one strain of embryos when cultured in the CEA. More hatched blastocysts resulted from embryos of both strains when cultured in the CEA. Two to eight-cell goat embryos cultured in the CEA for 72 hours or on cell monolayers reached to blastocyst stage …

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Evaluation Of The Crawfish Chitin-Carotenoid Complex And Its Nutritional/Pigmentation Effect In Poultry Diets., Keun Soo Lee Jan 1990

Evaluation Of The Crawfish Chitin-Carotenoid Complex And Its Nutritional/Pigmentation Effect In Poultry Diets., Keun Soo Lee

LSU Historical Dissertations and Theses

The present investigation involved utilization of the chitin-carotenoid complex and the whole meal derived from crayfish (Procambarus clarkii) composite byproduct, in controlled broiler diets to determine the biological value of these substrates as potential sources of growth promoters, red intensifying agents, and protein supplements. Included are basic studies of the unique characteristics of the chitin-protein and chitin-carotenoid complexes. The crawfish chitin-carotenoid substrate did not exhibit any deleterious effects on broiler growth performance in terms of animal weight gain and feed efficiency at levels up to 5% of the total diet. Controlled chitin addition to the diet indicated no apparent relationship …

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G88-892 Mixing Quality Pig Feed (Revised July 1992), Duane Reese, Mike Brumm Jan 1989

G88-892 Mixing Quality Pig Feed (Revised July 1992), Duane Reese, Mike Brumm

University of Nebraska-Lincoln Extension: Historical Materials

Pig feed quality problems and mixing recommendations are covered here. Feed ingredients represent over 60 percent of the total cost of farrow-finish pork production and 65-70 percent of the variable expenses. Attention to quality preparation, in addition to purchasing decisions, is a component of feed ingredient cost management. Errors in formulation, misuse of feed mixing equipment, use of poor quality feed ingredients or lack of a quality assurance program can have costly consequences.

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Rice Bran Stabilization By Improved Internal And External Heating Methods., Jiaxun Tao Jan 1989

Rice Bran Stabilization By Improved Internal And External Heating Methods., Jiaxun Tao

LSU Historical Dissertations and Theses

Rice bran stabilization was conducted by internal (microwave), external (oven drying and steam retorting) heating and non-heating ($\sp{60}$Co irradiation) treatments to improve currently used methods. Two commercial rice varieties cultivated in Louisiana, one long grain (Lemont) and a medium grain (Nato), were milled to collect bran samples. The bran was analyzed for its proximate composition and various physical and thermal characteristics. The proximate composition for long and medium grain bran, respectively, was: moisture, 11.2% and 10.8%; protein, 16.07% and 16.20%; fat, 19.20% and 21.97%; crude fiber, 8.49% and 8.41%; ash, 9.23% and 9.46%; and nitrogen-free extract, 47.01% and 44.07%. Physical …

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Kinetics Of Chromate And Phosphate Sorption By Oxide Minerals And Soils., David S. Burden Jan 1989

Kinetics Of Chromate And Phosphate Sorption By Oxide Minerals And Soils., David S. Burden

LSU Historical Dissertations and Theses

A nonlinear multireaction model was used to describe kinetic retention data sets for chromate, phosphate, arsenate, borate, fluoride, molybdate, selenite, and silicate by goethite, an iron oxide mineral, and selected soils. These data sets were obtained from laboratory batch experiments with time up to 24 h. Either a three-parameter version of the model consisting of one nonlinear reversible and one first order irreversible reaction, or a five-parameter version consisting of two nonlinear reversible and one first order irreversible reactions was capable of predicting anion sorption by goethite. A mechanistic model consistent with the nonlinear multireaction approach was also proposed in …

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Evaluation Of Fish Meal Supplement On Physiological Response And Milking Performance In Lactating Dairy Cattle Under Heat Stress., George Mark Toups Jan 1989

Evaluation Of Fish Meal Supplement On Physiological Response And Milking Performance In Lactating Dairy Cattle Under Heat Stress., George Mark Toups

LSU Historical Dissertations and Theses

Twenty-four mid-lactation heat stressed dairy cows were paired in a completely randomized block design on basis of breed, age, lactation number, calving date, previous mild production and milk fat content in order to evaluate experimental responses. Test treatment was a 50:50 dry matter (DM) corn silage-concentrate diet supplemented with 4.75% DM specially-selected fish meal (FM). Animals were housed under natural summer conditions for the duration of a 70-d experimental period, commencing in mid-June. Low roughage diets were slightly below NRC requirements for both energy and crude protein. DM intake, milk fat content, and milk fat:milk lactose ratio were statistically significant, …

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Concerning The Regulation Of The Slaughter, Processing, And Sale Of Meat Animals, Colorado General Assembly Jan 1989

Concerning The Regulation Of The Slaughter, Processing, And Sale Of Meat Animals, Colorado General Assembly

Session Laws 1951-2000

No abstract provided.

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Induction Of Polyploidy In Ictalurid Catfish And Comparative Performance Of Diploid And Triploid Channel Catfish And Channel X Blue Catfish Hybrids., Craig Gustaf Lilyestrom Jan 1989

Induction Of Polyploidy In Ictalurid Catfish And Comparative Performance Of Diploid And Triploid Channel Catfish And Channel X Blue Catfish Hybrids., Craig Gustaf Lilyestrom

LSU Historical Dissertations and Theses

This study provided indications of the feasibility of inducing polyploidy in ictalurids (channel catfish, Ictalurus punctatus, and hybrids with blue catfish, I. furcatus) by temperature or hydrostatic pressure shocks as well as the potential for improvement of growth and processing traits in triploid channel catfish x blue catfish hybrids. One-cell embryos of ictalurid catfish were subjected to either temperature or hydrostatic pressure shocks for induction of triploidy or tetraploidy. Hatch rates of embryos treated for induction of tetraploidy with hydrostatic pressure shocks were lower than those treated for induction of tetraploidy with heat shocks. Hatch rates of embryos tested for …

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