Poultry or Avian Science Commons^™

Recent Advances In Sustainable Production Of Enriched Chicken Eggs: A Mini Review, Karim El-Sabrout, Ayman Abd El-Aziz

Jurnal Ilmu Ternak Universitas Padjadjaran

Enriched or “designer” chicken eggs have emerged as an important category of functional foods aimed at improving human nutrition through dietary manipulation of laying hens. This mini-review summarizes recent advances in egg enrichment strategies, focusing on omega-3 fatty acids, vitamins, minerals, and antioxidant compounds. Omega-3 enrichment remains the most widely adopted approach, achieved through supplementation with flaxseed, fish oil, or microalgae, resulting in significant increases in eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) in egg yolk. Multi-nutrient enrichment, including selenium, vitamin E, and carotenoids, has also gained attention due to its potential in enhancing antioxidant capacity and health of hens …

Reference Values For Intraocular Pressure In Collared Scops Owls (Otus Lettia) Measured Using Rebound Tonometry, Yun-Shan Chiu, Chau-Hwa Chie, Pin-Huan Yu, Chung-Tien Lin

The Thai Journal of Veterinary Medicine

In this study, we aimed to establish species-specific reference values for intraocular pressure (IOP) in clinically healthy collared scops owls (Otus lettia) using rebound tonometry. Twelve free-living owls were included, and twentyfour eyes were examined. All owls were physically restrained in an upright position without sedation. Intraocular pressure was measured in both eyes using rebound tonometry (TONOVET; iCare Finland Oy, Vantaa, Finland) in d mode. No significant difference in IOP was observed between the right and left eyes. The mean IOP values were 10.42 ± 1.24 mmHg (median, 11 mmHg; range, 8–12 mmHg) in the right eye and 10.75 ± …

Napier Grass (Pennisetum Purpureum) Meal Modulates Growth Efficiency, Gut Morphology, And Systemic Health In Broiler Chickens, Eric Lim Teik Chung, Yee Lyn Ong, Nazri Nayan, Muhamad Faris Ab Aziz, Faez Firdaus Abdullah Jesse, Faizal Andri, Arissara Sopawong

The Thai Journal of Veterinary Medicine

Grass and leaf meals, which include vital phytocompounds, have the potential to be a natural and safe alternative to antibiotics in the poultry industry. Therefore, this study aims to assess Pennisetum purpureum leaf meal and its phytocompounds on the health performances of colored-broilers. A total of 216 unsexed Sasso chicks were assigned to six diet groups. The negative control (T1) received a commercial basal diet without antibiotics, while the positive control (T2) received the same diet with oxytetracycline (100 mg/kg). Groups T3 to T6 received no antibiotics and included P. purpureum meal at 1.25, 2.50, 3.75, or 5.00 grams per …

Wake-On-Anomaly Federated Architecture For Privacy-Preserving Poultry Health Early Warning, Mahmoud Aziz Louati

Masters Theses

Highly pathogenic avian influenza outbreaks, respiratory disease, heat stress, and silent equipment failures share one operational reality: they are detected too late because today’s poultry-health workflow is reactive, manual, and dependent on producers volunteering commercially sensitive data. This thesis presents a wake-on-anomaly federated architecture that addresses both the detection-latency problem and the privacy–adoption deadlock that has so far prevented cross-farm collaboration. The architecture is organized in two tiers. Tier 1 is a lightweight LSTM autoencoder that continuously screens four routine telemetry channels (water, feed, house temperature, activity proxy) and emits a per-window reconstruction-error score. A debounced k-of-m trigger with cooldown …

The Extraction And Chemical Characterization Of The Avian Pigments Turacin And Turacoverdin, Sarah R. Bekkali

Honors Scholar Theses

Bird coloration is a trait that extends beyond mere aesthetics as it has an extensive range of biological significance. Plumage patterns and hues can influence camouflage, mate choice, social dominance, and physiological performance. Bird fitness, their ability to survive and reproduce, is greatly dependent on color. Melanins, carotenoids, and pterins are well-studied pigment systems that are commonly found across many avian species’. Alternatively, porphyrin-based pigments are rare and less-studied as they only found in turacos a sub-Saharan African bird belonging to the family Musophagidae. This thesis focuses on two pigments of interest: turacin, the deep crimson-red pigment found in …

Differences In Local And Systemic Immune Responses To Primary And Secondary Immunizations With The Herpesvirus Of Turkeys (Hvt) Vaccine In Layer Pullets., Allie K. Bowerman

Poultry Science Undergraduate Honors Theses

Marek's disease, caused by a herpesvirus, is a major issue in poultry production due to its high mortality rate. The herpesvirus of turkeys (HVT) vaccine has been used as a crucial measure to mitigate outbreaks of Marek's disease in poultry production; however, little is known about the immune response to the HVT vaccine. In this study, we examined how primary and secondary intradermal (i.d.) vaccination with the HVT vaccine in the growing feather (GF) pulp affects local and systemic immune responses, including cellular, antibody, and cytokine responses. Six 9-week-old and six 19-week-old Light-brown Leghorn (LBL) pullets received a primary or …

The Evaluation Of Broiler Lines Divergently Selected For Water Conversion Ratio Under Acute And Chronic Stress, Baileigh B. Cash

Poultry Science Undergraduate Honors Theses

            The importance of water conversion ratio in broiler production influences not only bird physiology but also barn environment, litter quality, and provides potential solutions to environmental stressors. However, very little is known about how genetic selection for water conversion ratio can affect litter characteristics and performance parameters, specifically under heat stress conditions. This study evaluates the effects of genetic lines, environmental conditions, and time, on litter and bird performance characteristics in high water conversion ratio (HWCR) and low water conversion ratio (LWCR) broilers. Litter samples were collected from HWCR and LWCR broilers raised under heat-stress and thermal-neutral conditions, both before …

Effect Of 1,25(Oh)₂D₃ Glycoside Supplementation Duration On Bacterial Chondronecrosis With Osteomyelitis (Bco) Lameness In Broilers, Zoe R. Zeman

Animal Science Undergraduate Honors Theses

Bacterial chondronecrosis with osteomyelitis (BCO) is a significant cause of lameness in commercial broilers, resulting in substantial animal welfare concerns and economic losses. This study evaluated the effect of 1,25(OH)₂D₃ glycoside supplementation duration on the incidence of BCO-related lameness in broilers. Cobb surplus male broiler chicks were assigned to four treatment groups: a wire-flooring positive control, a litter-flooring negative control, and two treatment groups on litter flooring receiving 1 μg 1,25(OH)₂D₃ as glycosides supplementation per kg diet for either 14 or 28 days. Lameness incidence was recorded from day 22 through day 56, and all lame birds were evaluated for …

The Effects Of Heat Stress On White Blood Cell Profiles And Antibody Concentrations In Broilers Genetically Selected For Low Water Conversion Ratio Compared To The Modern Random Bred Broiler, Luke B. Janski

Poultry Science Undergraduate Honors Theses

Heat stress (HS) is one of the most significant environmental stressors impacting poultry production worldwide, reducing growth, feed efficiency, welfare, and immune competence. With global temperatures rising, understanding physiological and immunological adaptations to HS is essential for sustainable production. Broiler chickens selectively bred for low water conversion ratio (LWCR) have shown potential for reduced water consumption under environmental challenges; however, their immune resilience under HS conditions compared with modern random-bred (MRB) broilers remains unclear. This study investigated the effects of cyclic HS on red- (RBC) and white- (WBC) blood cells and humoral immunity in LWCR and MRB broilers. Birds were …

Environmental Enrichment Preferences And Play Behavior In Commercial Turkey Hens, Paul Dang

Poultry Science Undergraduate Honors Theses

Commercial turkey production contributes significantly to the U.S. agricultural industry, yet studies on positive welfare indicators, especially play behavior, are limited. This study evaluated turkey hen interactions with two environmental enrichments (straw bales and pecking stones hung from the ceiling) and the expression of play behavior in turkey barns. Three commercial turkey hen barns were equipped with environmental enrichments and time-lapse video cameras. Play behaviors were recorded during transect walks in two barns using 30-second scans of disturbed and undisturbed patches. Regional use of space around enrichments was quantified through region-of-interest (ROI) analysis of time-lapse images collected from days 16-31 …

Sorghum Grain Secondary Metabolites And Underlying Genetics To Reduce Foodborne Pathogens In Poultry, Maria A. Conti

All Dissertations

The rise in antibiotic-resistant pathogens poses a threat to the poultry industry's ability to maintain animal health, prompting growing interest in alternatives to synthetic antibiotics. The use of non-tannin sorghum [Sorghum bicolor (L.) Moench] in poultry rations offers a valuable alternative, as this cereal grain has a high bioactive profile that can provide health benefits, including antimicrobial (AM) activity. The scope of this study was to examine the AM potential of non-tannin sorghum grain against Clostridium perfringens, a major foodborne pathogen that negatively impacts poultry health and production. To that end, the inhibitory effects of a non-tannin sorghum …

Bluebird Bait: Quantifying The Attraction Of Ectoparasites To Nestling Eastern Bluebirds (Sialia Sialis), Ella Grace Bollinger

ATU Scholars Symposium

Ectoparasites, such as mosquitoes (Culicidae), blackflies (Simuliidae), and biting midges (Ceratopogonidae), have been shown to reduce population viability by lowering post-fledging survival and decreasing the lifetime reproductive success of adult birds. This issue is particularly concerning for songbirds such as the Eastern Bluebird (Sialia sialis) because their nestlings are relatively naked and have limited mobility, making them highly vulnerable to attacks by biting flies. However, the specific mechanisms attracting ectoparasites to nests remain understudied. We hypothesized that biting fly and mosquito abundance would be significantly higher at active Eastern Bluebird nests than that of empty boxes and would increase with …

Bird Population Response To Abiotic And Biotic Stresses In Urban & Restored Oak Savannah Habitat, Annabelle Ball

Posters - 2026

Birds are heavily impacted by urban development. Many experience habitat fragmentation and removal of food sources. However, other species can adapt to and even thrive in urban environments, thanks to certain tree species, bird feeders, and buildings. In North America, the house sparrow and the European starling are invasive species that benefit from urban environments (Bartelt, 2011; Fitzwater, 2014). Meanwhile, many habitats across the continent are experiencing restoration/rewilding efforts for the benefit of birds. One such habitat is the oak-savannah, which is characterized by 10-30% canopy cover and a mixture of prairie & woodland vegetation, supporting a high diversity of …

Comparative Efficacy Of Oral And Cloacal Administration Of Lactobacillus Probiotics And Postbiotics Against Campylobacter Jejuni Colonization In Broiler Chickens, Shreeya Sharma, Hosni Hassan, Khaled Abdelaziz

Publications

Campylobacter jejuni remains a major cause of foodborne illness worldwide, with poultry serving as the primary reservoir. In the absence of commercial vaccines or effective feed additives, probiotics and their byproducts (postbiotics) represent a promising and sustainable approach to reducing Campylobacter colonization in poultry. This study compared the efficacy of oral and cloacal administration of probiotic lactobacilli and their postbiotics in reducing Campylobacter colonization and modulating the cecal microbiome in broiler chickens. Day-old chicks were assigned to seven treatment groups that received either probiotics (live cells of four poultry-derived Lactobacillus strains: L. reuteri P43, L. acidophilus P42, L. animalis P38, …

Comparative Assessment Of Growth And Morphometric Characteristics In Naked Neck, Rhode Island Red, And Black Australorp Chickens, Naseer Ahmad, Sarzamin Khan, Rafi Ullah, Kamran Khan

Journal of Bioresource Management

This study investigated growth performance and morphometric characteristics in three chicken genotypes namely Naked Neck (NN), Rhode Island Red (RIR), and Black Australorp (BAL). One-hundred and eighty chicks (age, day-old), comprising 60 birds from each genotype, were distributed randomly into three replicates per group, with 20 chicks per replicate, under a completely randomized design. Birds were reared on deep litter for 18 weeks. Hatch weights were significantly higher (P < 0.05) in BAL (30.7 g) and RIR (30.2 g) compared to NN (28.2 g). Body weights showed no significant differences (P > 0.05) from weeks 2 to 4, but BAL and RIR outperformed NN (P < 0.05) from weeks 6 to 10. BAL maintained the highest body weight from weeks 12 to 18 (P < 0.05). Total weight gain (0-18 weeks) was significantly greater in BAL (1567 g), followed by RIR (1491 g) and NN (1219 g). The genotypes had significant effects on both feed intake and feed conversion ratio (FCR; P < 0.05). At 18 weeks of age, FCR was most efficient in BAL (3.53), followed by RIR (3.83), and NN (4.85). Mortality between weeks 4 and 18 was lowest in NN at 1.7 %, compared with 1.81 % in RIR and 1.84 % in BAL. Significant differences (P < 0.05) among genotypes were also observed in morphometric characters such as shank length, keel length, and breast circumference, with BAL generally showing larger measurements. In conclusion, BAL exhibited superior growth, feed efficiency, and morphometric characteristics, while NN demonstrated lower weight gain but better survivability, highlighting genotype-specific advantages for different production goals.

Effect Of Heat Stress On Jejunal Epithelial Barrier Integrity In Broilers Divergently Selected For High- And Low-Water Efficiency, Elizabeth S. Greene, Sara Orlowski, Sami Dridi

Poultry Science Faculty Publications and Presentations

Drought and water scarcity, exacerbated by global warming, are enormous threats to global food sustainability and security. Poultry, in particular, are highly impacted by adverse environmental stressors. As nutrient absorption and intestinal integrity are critical for growth and performance, understanding the impact on the broiler gastrointestinal tract is highly relevant. Here, we examined the effect of chronic cyclic heat stress (HS) on the jejunal expression profile of tight-junction, gap-junction, adherens, and desmosome genes in the 4th generation of broiler lines divergently selected for low (LWE)- and high-water efficiency (HWE). Male HWE and LWE broilers (n = 240/line) were allotted to …

Assessing Localized Recovery And Synchrony Of An Endangered Wetland Species., Aiyana Reissman

Theses

The state and federally endangered light-footed Ridgway’s rail (LFRR; Rallus obsoletus levipes) is central to regional conservation, yet the drivers of its population fluctuations remain poorly understood. The fragmented nature of coastal wetlands in Southern California is threatening the existence of endemic species like the LFRR. Tidal inundation, severe storms, and overpredation threaten the survival of LFRR. This study addresses population fluctuations by analyzing the spatial and temporal drivers of LFRR populations to inform effective, site-specific management.

To do this, a 45-year (1980–2024) LFRR census data set across 16 wetlands throughout its range in California was synthesized. A multi-faceted …

Effects Of Perching Behavior In Broilers On Welfare And Production Benefits, Natalie G. Bunn

Honors Theses and Capstones

Broiler chickens are bred for feed efficiency, rapid growth rate, and muscle development. Conventional broiler farms utilize fast-growing breeds that reach market weight rapidly and present welfare concerns. Primarily raised indoors with little enrichment, the genetics and husbandry practices of broilers encourage inactivity and perpetuate health problems such as skeletal deformities, lameness, and pododermatitis. Despite the commonness of these issues, there is little research on the reduction of such health complications through production management. This study investigated methods to promote perching behavior and the effects of riser perch and platform perch utilization in broilers. A mixed flock of slow-growing Gray …

How Semiflightless Birds Adapt: A Survey From Barú, Costa Rica, Eli P. Laloudakis

Scripps Senior Theses

When we think of birds, we think of flight. Because of this, scientific research often focuses on how birds evolved flight and how their wings function during flight. However, not all birds can fly or fly well, as wings wax and wane on developmental, seasonal, and evolutionary time scales (Dial and Heers 2021). Consequently, rudimentary wings can be found in developing birds, secondarily flightless or semiflightless birds, birds that undergo simultaneous molts, and extinct theropods with “protowings” (structures that preceded fully functional wings). Secondarily flightless and semiflightless birds often evolve where there is no/low predation, abundant year-round food supply, and …

Differences In Cytokine Mrna Expression At The Site Of Primary And Secondary Vaccinations With Herpesvirus Of Turkeys (Hvt) In Egg-Type Chickens., Allie Bowerman

2026 Research Poster Competition

Marek’s disease, a lymphoma causing virus, remains a major concern in poultry production systems. Although vaccination with live herpesvirus of turkeys (HVT) is crucial for controlling this disease, information on how the vaccine drives local/tissue immune responses that lead to protective immunity is limited. Using the growing feather (GF) in vivo bioassay, we assessed local cytokine mRNA expression following primary and booster intradermal (i.d.) HVT vaccinations in egg-type chickens. For this, six 9-week-old and six 19-week-old Light-brown Leghorn (LBL) pullets were i.d. injected into the pulp of growing feathers (GF; 10 µL/GF; 16 GFs/bird) with a primary (V1) or secondary …

Reducing Inorganic Phosphorus In Poultry Diets: Nutritional Constraints And Strategies For Successful Implementation, Elizabeth Ann Lynch

Graduate Theses, Dissertations, and Problem Reports (ETD)

Applied poultry nutrition and feed manufacture science can be described as a “three-legged stool” supported by pellet quality, feed hygienics, and nutrient availability, where imbalance in any one component can compromise overall bird performance. The research presented herein primarily addresses feed hygienics and nutrient availability, with pellet quality serving as an underlying theme, to better understand how processing conditions and dietary formulation influence performance and nutrient utilization.

In Chapter 2, the objective of this study was to evaluate the effects of hygienizer retention time on bacterial reduction during feed manufacture using Enterococcus faecium as a Salmonella surrogate. Pellet mill motor …

Optimization Of Feed Manufacturing Productive Capacity, Feed Quality, And Feed Safety Utilizing A Variety Of Pellet Die Parameters, Feed Additives, Conditioning Specifications, And Simulated Feed Bin Storages, Lucas Edward Knarr

Graduate Theses, Dissertations, and Problem Reports (ETD)

In Chapter 2, an experiment was conducted to determine if the inclusion of 1.50% mixer-added water (MAW) and/or 0.25% Azomite^® (AZM) would be suitable in alleviating concerns regarding pellet production rate and pellet quality when manufacturing feed with low-moisture corn. Furthermore, the authors aimed to determine if these additives had varying effects when utilizing different pellet die thicknesses. A 2 (Azomite; 0.00% or 0.25%) x 2 (mixer-added water; 0.00% or 1.50%) x 3 (pellet die thickness; 32 mm, 38 mm, or 45 mm) factorial arrangement was utilized to create the twelve experimental treatments, each manufactured …

Intelligent Dual-Energy X-Ray Absorptiometry (Idxa) And Small Animal Scanning As A Useful Tool To Measure Appendicular Bird Bone Mineral Density, Frank J. Dirrigl Jr., Samuel R. Buchanan

School of Integrative Biological & Chemical Sciences Faculty Publications

Accurately assessing the bone mineralization status of birds is crucial for poultry production and wild bird studies. We investigated the use of dual-energy x-ray absorptiometry (DXA) using Small Animal Measurement software to measure bone mineral content (BMC) and areal bone mineral density (aBMD) in excised radii of the willow ptarmigan (Lagopus lagopus) as a bird model. Our exploratory tests involved 117 scans to evaluate scanning parameters, scanning board types, bone stabilization, scan mode and size, and region of interest placement. Results indicated that mean BMC or aBMD were each significantly different when scanned on a forearm positioner board …

The Nebraska Bird Review (December 2025) 93(4), Whole Issue

Nebraska Bird Review

Changes to The Nebraska Bird Review, by Janis Paseka

Fall Field Report, August–November 2025, by W. Ross Silcock

First definitive records of Hermit Thrush and Wilson’s Warbler subspecies for Nebraska, by Stephen J. Brenner and Joel G. Jorgensen

Ogallala Fall Field Days, Sept. 26–28, 2025

Index to Volume 93

Subscription and Organization Information

Index To Volume 93

Nebraska Bird Review

Adams, Morgan
Aguiar: Maritza, Stephanie
Albright, Don
Alexander: Jeff, Jan
Aliferis, Taylor
Allard, Savannah
Allen, Edward
Allison, Betty
Altman, Dakota
Alvarado, A. H.
Ammon, E. M.
Anandan, Sampath Kumar
Andersen, Brett
Anderson: Ann, Chris, Will
Andrews, Ryan
Anhinga
Ani, Groove-billed
Annunziata, Laura
Armstrong, Nancy
Augustine, Jackie
Aurilio, James
Avocet, American

. . .

Zagst: Fred, Kay
Zeillemaker, Fred
Zemaitis, William
Zicafoose, Kirby
Zonotrichia leucophrys: gambelii, leucophrys, oriantha

Ogallala Fall Field Days, Janis Paseka

Nebraska Bird Review

The 2025 NOU Fall Field Days were held in Ogallala on September 26–28, with about 80 in attendance. The programs were held at the Quality Inn, and the meeting was planned by Boni Edwards, Dave Cunningham, and Paul Pearson. Field trips were led by Tobin and Keegan Brown, Jacob Cooper and UNK ornithology students, Joel Jorgensen and Stephen Brenner, T. J. Walker, and Thane Dinsdale. Destinations included various sites around Lake McConaughy, Lake Ogallala, Cedar Point Biological Station, Sutherland Reservoir SRA, Ash Hollow State Historical Park, Crescent Lake NWR, Arthur Co and various Sandhills lakes. The total species count was …

First Definitive Records Of Hermit Thrush And Wilson’S Warbler Subspecies For Nebraska, Stephen J. Brenner, Joel G. Jorgensen

Nebraska Bird Review

During the fall of 2025, we initiated a pilot migratory bird-banding project in the Nebraska Panhandle. While the project’s goals included examining species composition, volume, and body condition of migratory birds at the western edge of the state compared to the eastern edge of the state, we also used this project to document the occurrence of subspecies and species which are very challenging or impossible to identify through field observation. Here, we report on the first definitive records of two subspecies in Nebraska.

On 16 September 2025, SJB banded an adult male Wilson’s Warbler (Cardellina pusilla) that was …

Fall Field Report, August–November 2025, W. Ross Silcock

Nebraska Bird Review

As in previous fall seasons, by far the most modifications to BONO came from late departure dates; around 87 species were included, no fewer than 13 of these setting record late dates, notably Eastern Whip-poor-will, Mountain Plover, Brown Thrasher (north), Henslow’s Sparrow (flight call only), and Orchard Oriole.

Although this is a Fall Seasonal Report, noted or suggested breeding activity is of interest. Exciting were the 2nd and 3rd presumed breeding records of Black-chinned Hummingbird and, in Dodge Co, the 5th record of breeding by Black-bellied Whistling-Duck. Perhaps the strangest west to east occurrence was a Golden Eagle adventure in …

Changes To The Nebraska Bird Review, Janis Paseka

Nebraska Bird Review

As of this issue, The Nebraska Bird Review has been in existence for 93 years, looking very much now as it did when it began in 1933. However, due to the increasing costs of printing and postage, there will be some changes in its future. Our newsletter, The Burrowing Owl, is already provided online to our members, in a user-friendly and informative form. Future issues of The Nebraska Bird Review will also utilize a digital format to offer a more timely and colorful publication.

This is the final issue for which Ross Silcock will be compiler of the seasonal …

A Silver Spoon Effect Reduces Lifetime Fitness In A Declining Loon Population, Walter H. Piper, Claudia Kodsuntie, Hayden Walkush

Biology, Chemistry, and Environmental Sciences Faculty Articles and Research

A complete understanding of factors that influence animal fitness requires that we measure not only those occurring day to day in the life of an animal but also those that operate on longer time scales. Here, we investigated silver spoon effects (fitness impacts resulting from conditions faced early in life) and carryover effects (fitness impacts caused by environmental factors in a previous season) in a northern Wisconsin population of the common loon (Gavia immer). The mass of a loon chick divided by its age, an indication of food it received from its parents in its first 4 to …