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Exploratory Evaluation Of Handler Performance And Processing-Related Outcomes During Cattle Handling, Morgan Marquardt

Department of Animal Science: Dissertations, Theses, and Student Research

Animals have several critical roles in society, including the production of food and fiber, and companionship. Contact with animals has been shown to benefit human physical and mental health, yet little research has investigated the impact that humans have on animals. Handler skill may considerably affect the extent to which humans influence animal health and wellbeing, and this may be a critical consideration for animal agriculture. Objective assessment of cattle handler skill has received limited attention in the scientific literature, despite its importance to human safety and animal welfare. When compared to less skilled handlers, highly skilled cattle handlers may …

Factors Influencing Sex-Based Movement Patterns In The Banded Garden Spider, Argiope Trifasciata (Forskal, 1776), Brandon R. Marrone

School of Biological Sciences: Dissertations, Theses, and Student Research

Movement is a fundamental ecological process shaping how individuals acquire mates, secure resources, and navigate heterogeneous landscapes. In species with extreme sexual size dimorphism (eSSD), such as the orb‑weaving spider Argiope trifasciata, males and females are predicted to experience different movement pressures driven by their reproductive roles. This thesis examines how individual traits and environmental conditions jointly influence movement across both sexes. Across two field seasons, we used intensive mark–recapture methods to quantify natural movement patterns of males and females within mapped prairie plots. The first chapter tested long‑standing predictions gravity hypothesis, which posits that smaller males benefit from …

Perceived Barriers To Integrated Crop–Livestock Systems: Evidence From A Nebraska Producer Survey, Omid Tarashtwal

Department of Agricultural Economics: Dissertations, Theses, and Student Research

Integrated crop-livestock systems offer agronomic, economic, and environmental benefits, yet reintegration has been slow across the Northern Great Plains despite sustained interest. Existing research has documented barriers to transition conceptually, but quantitative evidence on which barriers producers perceive as most important and which producer and operation characteristics are associated with stronger barrier perceptions remains limited. This thesis addresses that gap using data from the 2023 Nebraska Agriculture Operator Survey.

The analysis focuses on 241 Nebraska producers, including 179 crop-only and 62 livestock-only operations. Seven models are estimated, combining ordered logit estimation for single-item barriers with linear regression for averaged barrier …

Detection And Quantification Of Allergen Cross-Contact In Shared Frying Oil Using Targeted Mass Spectrometry, Francisca Asigri

Department of Food Science and Technology: Dissertations, Theses, and Student Research

Cow’s milk and egg allergies are prevalent IgE-mediated food allergies that pose significant public health concerns worldwide. Although strict avoidance remains the primary management strategy, unintended exposure can still occur through allergen cross-contact, particularly in commercial and industrial food operations that utilize shared frying oils. The objective of this study was to identify and quantify allergen transfer in shared frying oil and assess the robustness of existing targeted mass spectrometry methods (LC-MS/MS) for detecting milk and egg proteins in heated oil matrices.

Heated oil spikes were developed by incorporating non-fat dry milk (NFDM) and whole egg powder (WEP) into oil …

Gamma Sigma Delta, Nebraska Chapter Newsletter, Issue #69 Spring 2026

Gamma Sigma Delta, Nebraska Chapter: Newsletters

President's message, Dustin Loy

Undergraduate Scholarship Awards

2026 Chapter Officers and Committees

Faculty Awards

Membership info and dues form

Grad Student Scholarship

Award of Merit

NU Foundation Fund

New Initiates

Save the Date

In Memoriam:
Kara Daye Heideman (March 31, 1980-December 11, 2025)
L. Dale Van Vleck (June 11, 1933-December 23, 2025)
James (Jim) Eugene Specht (September 12, 1945-February 13, 2026)
Irvin Thomas Omtvedt (June 12, 1935-April 6, 2026)
Fayrene L. Hamouz (June 6, 1946-April 8, 2026)
Robert L. Raun (April 22, 1928-April 22, 2026)

Eating For Healthy Eyes: The Role Of Nutrition In Ocular Health, Brianna Stroh

Honors Program: Senior Projects (Public)

The central research question of this thesis asks: How does nutrition influence ocular health overall and the impact of nutrition on the development or progression of common eye diseases? Building upon existing research in optometry/ophthalmology, nutrition science, and public health, this project examines the physiological mechanisms linking diet to eye health and evaluates how specific nutrients and dietary patterns contribute to disease prevention and visual function. This thesis employs a comprehensive review of peer-reviewed literature to evaluate the relationship between nutrition and ocular disease. Key areas of focus include the role of oxidative stress in eye disease development, the protective …

The Relationship Of Concussion And Alcohol Use: An Investigation Into Intervening Cognitive Mechanisms, Alexi Cranford

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

Traumatic brain injury (TBI) and alcohol use are common and pervasive issues in society today. Alcohol use is frequently linked with brain injury even in its mildest form, concussion, also known as mild traumatic brain injury (mTBI). The brain’s reward system has been shown to be involved in alcohol and substance use behaviors, and a neural basis has been demonstrated to underlie reactivity to alcohol cues. Learning theories such as classical and operant conditioning can also help conceptualize how these relationships develop. Reward sensitivity and executive functioning (particularly decision-making skills) are cognitive processes that may moderate the relationship between brain …

Effect Of Novel Antimicrobial Compounds On Fungal And Bacterial Pathogens, Megan Wilderman

Honors Program: Senior Projects (Public)

Antimicrobial resistance is a growing concern in medicine¹ leading to a need for the development of novel compounds. Two compounds were tested in this study, 2-hydroxyethylhydrazine (HEH) and para-nitrophenyl-isocyanide (NPIC). HEH targets phosphatidylcholine (PC) production², and NPIC targets mitochondrial function³. Choline (Cho) is a compound that bypasses the inhibition of HEH through the Kennedy pathway.² Two-fold serial dilutions were conducted in 96-well plates to test the sensitivity of different bacteria to HEH and fungi to HEH and NPIC in different media types. A choline condition was also included in the HEH dilutions to test …

Dangerous Or Neglected, Amanda Landaverde

Nebraska Journal on Advancing Justice

No abstract provided.

Beneath The Northern Sky: A Family’S Story Of Faith, Work, And Loss In 19th Century East Friesland. A Generational Narrative For Descendants Of East Frisian Immigrants., Derek M. Heeren

Genealogy Resources

Beneath the Northern Sky traces the quiet endurance of one East Frisian family as they live, labor, and worship along the lowlands of northwest Germany in the early nineteenth century. At the center of the story stands Wessel Heeren, a farmer and shipmaster whose days move between the ledgers of the farm, the rhythms of the Gulfhaus, and the waterways that connect his village to the wider world for trade. Alongside his wife Foske and their growing family, Wessel navigates a life defined by faithful attention to land, to kin, to church, and to a tradition of self-governance known …

George Sturgeon, Metal Fluorides & Vice Chair, Mark A. Griep, George D. Sturgeon

Department of Chemistry: Faculty Interviews

Dr. George Sturgeon was a chemistry professor at the University of Nebraska -Lincoln for 39 years, from 1964 to 2003. During his time at UNL, he spent 15 years as the vice chair. Something in his youth must have sparked an interest in chemistry because he earned a bachelor’s in that subject from the University of North Dakota in Grand Forks. Then, he traveled 870 miles east to Michigan State University in East Lansing where he earned his doctorate. Immediately after graduating, he joined the University of Nebraska-Lincoln in 1964 as an assistant professor but was soon promoted to associate …

Development And Evaluation Of Lipid Nanoparticle-Encapsulated Dna Vaccines For Avian Influenza In Chickens, Sushmita Kumari

Dissertations and Doctoral Documents, University of Nebraska-Lincoln, 2023–

Avian influenza virus (AIV) remains a major challenge for global poultry health, food production, and agricultural economies. Both low-pathogenic (LPAIV) and highly pathogenic (HPAIV) strains continue to circulate and evolve, creating an ongoing need for vaccines that can be updated quickly and provide broad protection. Although DNA vaccines offer a safe and flexible approach to rapidly incorporate new antigens, their use in poultry has been limited by poor delivery efficiency and the vulnerability of naked DNA to degradation. Lipid nanoparticles (LNPs), which have proven highly effective for mRNA delivery, offer a promising solution, yet their potential for DNA delivery in …

Unl Emeriti And Retirees Association Newsletter, February 2026

UNL Emeriti and Retirees Association: Newsletters and Other Materials

University of Nebraska-Lincoln Emeriti and Retirees Association Newsletter, February 2026>

Message from the ERA President, Vicki Highstreet

Thank you to former ERA President, Pam Edwards

Welcome to new members

Introducing a new ERA member: Ellen Paparozzi

ERA 65th anniversary

Organizational development plan

Funding opportunity

Wisherd awards

Wake up your well-being

mini-grant update

State of long-term care in Nebraska

Announcements and notices

Upcoming programming

Programming recap

Memory moments

Vultures, Bryan M. Kluever, Lee A. Humberg, Scott C. Barras

Wildlife Damage Management Technical Series

Fact sheet about vultures including information about human--wildlife conflicts, the vulture roost, affects on livestock, structures, human health and safety, identification of damage, management methods, legal considerations, and economics. Also included is an overview of the species.

Economic Impacts Of Abolishing Vertical Integration In The Us Pork Industry, Konstantinos Giannakas

Department of Agricultural Economics: Presentations, Working Papers, and Gray Literature

This paper develops a multi-market framework of analysis of vertical relationships in pork production and game theoretic models of heterogeneous firms to examine the economic, market and welfare impacts of abolishing vertical integration in the US pork sector. Different scenarios on the causes of vertical integration and the potential states of nature that can emerge after the removal of this vertical market arrangement are considered within this framework. Analytical results are consistent across the different scenarios and forms of strategic interactions between pork producers and indicate that the abolishment of vertical integration in the US pork sector will hurt pork …

Las Representaciones Figurativas Del Sitio Arqueológico Cuidad Del Jaguar (Honduras): Espacio Sagrado, Conceptos Compartidos Y Diálogo Entre Mesoamérica Y La Zona Andina, Geydy Rodríguez Wood

Actas seleccionadas del SIMPOSIO ARTE 4.2: Migraciones en la imagen prehispánica: transitando territorios del pasado al presente. 58º Congreso Internacional de Americanistas, Novi Sad, Serbia, 2025.

El sitio arqueológico Ciudad del Jaguar-T1, se encuentra ubicado en el noroeste de Honduras. Pertenece al Área Intermedia, considerada zona de frontera y paso entre Mesoamérica y la Zona Andina. Esta ubicación facilitó que, durante la época prehispánica, fuese un sitio de migraciones e interacción constante entre culturas del norte y del sur del continente, que dio origen a una civilización hasta ahora desconocida, que se formó, desarrolló y tuvo una significativa producción artística. En el presente trabajo propongo el estudio y la lectura e interpretación de las imágenes figurativas representadas en los objetos excavados, como también su utilidad y …

Aves, Felinos Y Ofidios En Los Templos Montaña Amerindios, Sarai Ramos Muñoz

Actas seleccionadas del SIMPOSIO ARTE 4.2: Migraciones en la imagen prehispánica: transitando territorios del pasado al presente. 58º Congreso Internacional de Americanistas, Novi Sad, Serbia, 2025.

El siguiente estudio se centra en la comparación de las representaciones pictóricas de aves, felinos y ofidios de algunos de los principales Templos Montaña, tanto de la zona andina, como de Mesoamérica. Dentro de él se pueden apreciar las similitudes y diferencias arquitectónicas y escultóricas simbólicas de estas imágenes. El análisis comparativo se realiza a través de un estudio iconográfico e iconológico de la arquitectura escultórica de dichos templos y de cada una de las representaciones zoomorfas relacionadas con el concepto del Axis Mundi prehispánico, centrándose en el águila, el jaguar y la serpiente. Al mismo tiempo se analiza la …

Evaluating Cow/Calf And Stocker Performance When Grazing Sudangrass With And Without Sunnhemp, Shelby L. Davis-Jenkins, Daren D. Redfearn, Mary E. Drewnoski

Nebraska Beef Cattle Reports

Summary with Implications

Sudangrass can provide high-quality summer forage, supporting cow/calf pairs and growing cattle. In this study, sudangrass or a sudangrass–sunnhemp mix was grazed over two years by cow/calf pairs and heavy stockers (~880 lb). There was no difference in carrying capacity between forage types. Sunnhemp inclusion had no effect on cow body condition or nursing calf gain. Cows maintained condition through peak lactation, and nursing calves gained 2.27 lb/day. Stockers gained 1.56 lb/day on sudangrass alone and 1.73 lb/day on the mix. However, the added seed cost of sunnhemp increased the cost of gain in year 1 and …

Effect Of Corn Harvest With A Chopping Head On Performance Of Cattle Grazing Corn Residue, Conner K. Biehler, Mary E. Drewnoski, Jim C. Macdonald

Nebraska Beef Cattle Reports

Summary with Implications

The effects of harvesting corn using a chopping vs a standard, non-chopping combine head on steer performance when grazing corn residue were evaluated. Steers were supplemented with dry distillers grains at 0.6% of initial body weight. The amount of corn residue mass and the quality of the husk did not differ between harvest methods. Steer gains were over twice as high in year 2 (2.10 lb/d) than year 1 (0.76 lb/d), potentially due to greater husk digestibility and milder winter conditions. Corn residue harvested with a standard combine head resulted in a slightly higher average daily gain …

Artificial Insemination Of Beef Heifers With Multi-Sire Semen, Dempster M. Christenson, Jordan M. Thomas, Daniel J. Kelly, Rick N. Funston

Nebraska Beef Cattle Reports

Summary with Implications

This study compared pregnancy rates of beef heifers artificially inseminated with multi-sire semen to single-sire semen. It was hypothesized pregnancy rates resulting from multi-sire semen would be increased compared to single-sire semen. Heifers were artificially inseminated with semen from one of three sires or semen from a combination of the same three sires. Pregnancy rates did not significantly differ. Paternity testing suggests sire parentage can be unequal when semen is mixed from multiple sires. In summary, similar pregnancy rates were observed using single-sire and multi-sire semen, but progeny may have unequal sire representation.

Supplementing Monensin And Rumen Undegradable Protein To Late-Gestation Heifers, Dempster M. Christenson, Rick N. Funston

Nebraska Beef Cattle Reports

Summary with Implications

This study evaluates the effects of supplementing late-gestation heifers with rumen-undegradable protein and monensin on weight gain, feed efficiency, and reproductive performance, and subsequent impact on progeny. We hypothesized that supplementation would enhance growth and feed efficiency, ultimately improving cow and calf performance. Previously synchronized artificially inseminated heifers were fed ad libitum hay for 89 d prior to calving. Feed was top dressed with chelated mineral with or without monensin, dried distillers’ grains, or dried distillers’ grains and monensin. Supplementation with rumen undegradable protein increased growth rate and decreased calving difficulty with no further effects on cow …

Effect Of Feeding Whole Soybeans, Roasted Soybeans, Or Distillers Grains In Silage-Based Growing Beef Diets, Melissa K. Bausch, Rebecca Mcdermott, Jim C. Macdonald, Pablo L. Loza, Galen E. Erickson

Nebraska Beef Cattle Reports

Summary with Implications

An individual feeding experiment was conducted to evaluate the effect of feeding raw whole soybeans (WSB), roasted whole (RSB) soybeans or distillers grains (MDGS) at three inclusions (7%, 14%, or 21% of diet dry matter) on growing performance, compared to a common control diet (0%) with urea. The greater inclusions of roasted soybeans or distillers grains increased gain and efficiency in growing cattle. Cattle fed the 21% inclusion of roasted soybeans were the most efficient, likely due to the protected protein increasing rumen undegradable protein content, and the additional energy from the higher levels of fat and …

Live Biomass Estimation With Canopeo In Rangeland Systems, Hannah K. Allen, Mitchell B. Stephenson, Daniel R. Uden

Nebraska Beef Cattle Reports

Summary with Implications

This project evaluated Canopeo, a free smartphone app that estimates fractional green canopy cover (FGCC), as a tool for monitoring aboveground biomass in Nebraska Sandhills rangelands. Live biomass was significantly higher in August than in June with some variability by year. FGCC showed a moderately strong relationship with current-year live biomass collected in either June or August. These results indicate that, in addition to producers’ field knowledge, Canopeo images taken with a smartphone or digital camera can offer a quick, visual estimate of forage conditions. This method may help reduce the need for labor intensive and destructive …

Effect Of An Accelerated Adaptation Protocol On Performance And Health Of Feedlot Steers Drenched With Lactipro, Rebecca L. Mcdermott, Samuel E. Loy, Isaque F. Vicci, Mark Corrigan, Braden C. Troyer, Galen E. Erickson, Jim C. Macdonald

Nebraska Beef Cattle Reports

Summary with Implications

A finishing study evaluated the effects of an accelerated adaptation protocol in conjunction with Lactipro on performance and health of steers. Five adaptation programs were evaluated with steers adapted to a finishing diet in 21, 14, 7, or 0 days. An additional accelerated adaptation program provided intensive feed delivery with 0-d adaptation. Cattle assigned to the 21-d and 0-d adaptations gained faster and consequently had greater HCW compared to the 7-d and 14-d adaptation, resulting in a quadratic response for ADG and HCW. The 0-d adaptation with intensive feed delivery had similar ADG and HCW compared to …

Energy Value Of High-Moisture Corn In Feedlot Cattle Diets Derived Through Meta-Analysis, Alfredo Dicostanzo

Nebraska Beef Cattle Reports

Summary with Implications

Cattle feeders or their nutritionists who rely on high-moisture corn (HMC) use a standard adjustment to energy content of the diet based on observation or previous research reports. Because moisture content of HMC is the result of many field and harvest factors, a common adjustment to the energy value of HMC applied to all conditions may not be appropriate. The hypothesis that moisture content of HMC determines its energy concentration was tested. Through a meta-analysis, it was determined that feed intake was depressed while energy content of HMC increased at greater moisture content. A simple method to …

Effects Of Feeding Raw Soybeans Or Roasted Soybeans To Feedlot Steers, Melissa K. Bausch, Jim C. Macdonald, Pablo L. Loza, Galen E. Erickson

Nebraska Beef Cattle Reports

Summary with Implications

A feedlot study compared feeding raw or roasted soybeans, soybean meal, or distillers grains to a dry-rolled corn with urea control on finishing cattle performance and carcass traits. Cattle fed roasted soybeans had improved marbling and gained more weight over the feeding period than cattle fed whole soybeans. Feed conversion was improved in the steers fed the roasted and whole soybean containing diets over steers that consumed the distillers grains diet. Cattle fed soybean meal and distillers grains had similar performance and carcass characteristics in this experiment. Cattle fed soybeans, soybean meal, or distillers had better gains …

Effect Of Using Either Synovex Primer Or Synovex Choice Compared To Not Implanting On The Performance Of Growing Steers, Sawyer D. Starrett, Rebecca L. Mcdermott, Sofia Suarez Lorences, Pedro Henrique Jota Fernandes, Dirk Burken, Jessica L. Sperber, Galen E. Erickson, Jim C. Macdonald

Nebraska Beef Cattle Reports

Summary with Implications

A 120-day winter-growing study utilized 576 head of steers to evaluate three dry lot implant strategies on the growth of steers. The three implanting strategies included a non-implanted control, Synovex® Primer™, or Synovex Choice®. While on harvested corn residue fields, steers were supplemented with 4 lb Sweet Bran and 0.375 lb of a vitamin and mineral package. The targeted gain for the non-implanted control was 1.25 lb/d. Both Synovex Primer and Synovex Choice increased ADG over the non-implanted control cattle by 7.5% and 12.7%, respectively. Additionally, Synovex Choice had a 4.8% increase in ADG over Synovex Primer. …

Evaluation Of Ferappease Administered At Arrival And Time Of Reimplant On Feedlot Performance And Carcass Characteristics Of Yearling Beef Steers, Carsten L. Loseke, Galen E. Erickson, Jessica L. Sperber

Nebraska Beef Cattle Reports

Summary with Implications

Cattle experience stress in the feedlot during handling events such as initial processing and reimplant that can negatively impact morbidity and mortality, feedlot performance, and carcass outcomes. Application of a maternal Bovine Appeasing Substance (mBAS) marketed as FerAppease (FERA Diagnostics and Biologicals) has been hypothesized to mitigate stress in cattle. A commercial feedlot study compared the effectiveness of FerAppease applied in 10mL doses to yearling native beef steers at initial processing and reimplant to a placebo product on cattle performance, morbidity and mortality parameters, and carcass traits. Steers administered FerAppease tended to have improved feed conversion on …

Effect Of Feed Access Time On Feedlot Cattle Performance, Carcass Characteristics, Feeding Behavior And Ruminal Ph, Carsten L. Loseke, Rebecca L. Mcdermott, Josh R. Benton, Keara O'Reilly, Galen E. C. Erickson, Jim C. Macdonald

Nebraska Beef Cattle Reports

Summary with Implications

Bunk management is crucial for modern feedlots, and understanding the ideal time to target a slick bunk is important. A feedlot study compared the effect of providing finishing cattle with 12, 15, 18, 21, or 24 hours of access to feed on performance, carcass characteristics, feeding behavior, and ruminal pH. As access time to feed increased, feed intake and day-to-day variation of feed intake increased linearly, while gain and feed conversion were unchanged. Cattle with greater access time to feed spent more time per day at the bunk, and consumed feed more slowly. A cubic effect on …

Evaluation Of Lysoforte Extend On Rumen Fermentation Parameters, Rumen And Total Tract Digestion, And Fatty Acid Digestion, Anna Kobza, Dalton Anderson, Jerilyn Hergenreder, Jim C. Macdonald

Nebraska Beef Cattle Reports

Summary with Implications

Supplemental fat fed in finishing diets in recent years has generally increased in price. This digestibility study evaluated LYSOFORTE Extend, a lysophospholipid based nutritional emulsifier, in beef finishing diets containing tallow or corn oil. Five ruminally and duodenally cannulated steers were used in a 5 × 5 Latin Square design. Treatments followed a 2 × 2 +1 factorial: 1) No Oil (negative control), 2) Corn Oil (3.5%), 3) Tallow (3.5%), 4) Corn Oil + LFE (8 g/d), and 5) Tallow + LFE (8 g/d). Cattle fed the negative control diet had greater dry matter intake than cattle …