Anna K. Johnson
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View article: When Machines Speak Science: Testing Consumers’ Perceptions of AI-Generated Communication Messages
When Machines Speak Science: Testing Consumers’ Perceptions of AI-Generated Communication Messages Open
Effective science communication is essential for fostering public understanding and trust in scientific information, particularly as emerging technologies like artificial intelligence (AI) are used to generate content quickly. The purpose …
View article: Effects of piglet enrichment on sow skin lesions and behavior before and after tail docking and castration
Effects of piglet enrichment on sow skin lesions and behavior before and after tail docking and castration Open
Commercially housed pigs face multiple welfare challenges, such as painful husbandry procedures or a lack of environmental enrichment. We evaluated sow behavior in response to piglets experiencing tail docking and castration. Our second ob…
View article: Sampling size methodologies used in pig welfare audits underestimate animal-based measures: a preliminary exploration
Sampling size methodologies used in pig welfare audits underestimate animal-based measures: a preliminary exploration Open
Objective The objective of this observational study was to compare and contrast the occurrences of animal-based measures evaluated in the Common Swine Industry Audit (CSIA) with the use of 2 sampling methods (total farm inventory [TOTAL] v…
View article: 201 Evaluating the impact of thermal conditions on behavior in feeder pigs
201 Evaluating the impact of thermal conditions on behavior in feeder pigs Open
The swine industry is one of the largest livestock production systems in the world. Therefore, understanding the impact of thermal stress on animal welfare, productivity, and behavior has become crucial to support sustainability in livesto…
View article: Precision livestock farming usage among a subset of U.S. swine producers: Insights through a structural equation modeling approach
Precision livestock farming usage among a subset of U.S. swine producers: Insights through a structural equation modeling approach Open
There is limited information about which factors influence the use and intention to use Precision Livestock Farming (PLF) technologies in livestock farming. Effective interventions that address the enablers and barriers to using PLF requir…
View article: Tibial Artery Stent Deformations From Ankle Plantarflexion and Dorsiflexion, Knee Flexion, and Simulated Calf Muscle Contraction
Tibial Artery Stent Deformations From Ankle Plantarflexion and Dorsiflexion, Knee Flexion, and Simulated Calf Muscle Contraction Open
Diametric crush in posterior tibial and peroneal stents was potentially due to their location in the deep posterior compartment and adjacent to the soleus/gastrocnemius muscles that bulge with joint motion. Crush in the posterior tibial is…
View article: Dietary vitamin E: effect on oxidative stress, maze learning performance, and anxiety behaviors in rats
Dietary vitamin E: effect on oxidative stress, maze learning performance, and anxiety behaviors in rats Open
The brain is particularly susceptible to oxidative stress (OS) and damage to membranes is associated with learning and memory decline, impacting animal welfare. Vitamin E is an antioxidant which crosses the blood-brain barrier. Our objecti…
View article: Graduate Student Feedback Related to Diversity, Equity, and Inclusion in the Department of Animal Science
Graduate Student Feedback Related to Diversity, Equity, and Inclusion in the Department of Animal Science Open
The Department of Animal Science at Iowa State University is dedicated to supporting students from various backgrounds and identities. The objective of this study was to obtain comprehensive feedback from graduate students housed in the De…
View article: PSII-3 Effect of environmental enrichment on pig average daily feed intake and average daily gain in the early nursery phase
PSII-3 Effect of environmental enrichment on pig average daily feed intake and average daily gain in the early nursery phase Open
Transition from the sow to nursery is a stressful time for pigs and commonly leads to negative impacts on pig health, welfare, and lifetime performance. The objective of this study was to determine if the addition of a biologically relevan…
View article: 271 Does social buffering amongst familiar weaned beef calves mitigate castration stressors?
271 Does social buffering amongst familiar weaned beef calves mitigate castration stressors? Open
Co-mingling of beef feeder calves from multiple sources results in biological and behavioral stressors. This study is part of a project exploring social relationships between individual beef cattle and potential benefits of social bufferin…
View article: PSV-17 Disease surveillance in feedlot cattle via interactions with a novel cotton rope
PSV-17 Disease surveillance in feedlot cattle via interactions with a novel cotton rope Open
Disease surveillance in feedlot cattle is vital for minimizing morbidity and mortality and maintaining cattle welfare. Hanging a novel cotton rope for disease surveillance is commonly used in pig production but is less developed for feedlo…
View article: PSII-2 Does environmental feeder enrichment for weaned pigs drive feeder usage and improve final body weight?
PSII-2 Does environmental feeder enrichment for weaned pigs drive feeder usage and improve final body weight? Open
Transition from the sow to nursery pens is a stressful time for pigs and commonly leads to post-weaning anorexia and growth check. This can have negative impacts on pig health, welfare, and lifetime performance. The objective of this study…
View article: 328 Assessment of chronically ill or injured feedlot cattle populations at eight United States and nine Canadian feedlots and implications for cattle welfare
328 Assessment of chronically ill or injured feedlot cattle populations at eight United States and nine Canadian feedlots and implications for cattle welfare Open
Cattle health management in the feedlot sector continues to evolve and improve cattle welfare by promoting an understanding of illness and injury to minimize their effects. Many papers have focused on treating individual ill or injured cat…
View article: The welfare of ill and injured feedlot cattle: a review of the literature and implications for managing feedlot hospital and chronic pens
The welfare of ill and injured feedlot cattle: a review of the literature and implications for managing feedlot hospital and chronic pens Open
By definition, ill and injured animals are on the negative valence of animal welfare. For beef cattle kept in feedlot settings, advances in cattle health management have resulted in a greater understanding and prevention of illness and inj…
View article: Sociality in pre- and post-wean beef calves
Sociality in pre- and post-wean beef calves Open
Bonding between beef cows and their calves is well established; however, social relationships between calves is less understood. In wild ungulates, young calf integration into the natal herd is typically facilitated by its dam based in pa…
View article: 37 Key learnings from the improving pig survivability project
37 Key learnings from the improving pig survivability project Open
The Improving Pig Survivability Project has completed 5 yr encompassing research, education, and extension with the goal of reducing overall mortality in the U.S. commercial swine industry. The project is funded by National Pork Board and …
View article: Undergraduate Student Feedback Related to Diversity, Equity, Inclusion, and Belonging in the Department of Animal Science
Undergraduate Student Feedback Related to Diversity, Equity, Inclusion, and Belonging in the Department of Animal Science Open
The Department of Animal Science at Iowa State University strives to support students from diverse backgrounds. Therefore, to assess the current departmental climate regarding diversity, equity, inclusion, and belonging, a survey instrumen…
View article: Impressions of sow overgrown toes on U.S. farms: What animal-based factors are driving this?
Impressions of sow overgrown toes on U.S. farms: What animal-based factors are driving this? Open
The purpose of this study was to poll farm managers regarding the animal-based factors that may drive overgrown toes on-farm. All survey questions were self-reported by the participants. There was a total of 20 questions, which were separa…
View article: Impressions of sow overgrown toes on U.S. farms: What environmental-based factors are driving this?
Impressions of sow overgrown toes on U.S. farms: What environmental-based factors are driving this? Open
The purpose of this study was to poll farm managers regarding the environmental-based factors that may drive overgrown toes on-farm. All survey questions were self-reported by the participants. There was a total of 20 questions, which were…
View article: Impressions of sow overgrown toes on U.S. farms: What environmental factors are driving this?
Impressions of sow overgrown toes on U.S. farms: What environmental factors are driving this? Open
The purpose of this study was to poll farm managers regarding (1) prevalence of sow overgrown toes at their farm, and (2) to determine if environmental factors were a driving factor behind prevalence of overgrown toes. All survey questions…
View article: Investigation of the diversity, equity, inclusion, and belonging within the undergraduate student population within the Department of Animal Science at Iowa State University
Investigation of the diversity, equity, inclusion, and belonging within the undergraduate student population within the Department of Animal Science at Iowa State University Open
Iowa State University (ISU) provides resources for diversity, equity, inclusion, and belonging (DEI-B) to provide students with a comfortable academic home regardless of their demographics or prior experiences. The objective of this study …
View article: From birth to lying on- or under a supplemental heat source: How long does it take for half the litter to lie down and how long do they stay?
From birth to lying on- or under a supplemental heat source: How long does it take for half the litter to lie down and how long do they stay? Open
Piglets are susceptible to hypothermia because they lack hair and energy reserves, have a large surface area to body weight ratio, and have poor body thermostability. Different heat sources are used on farm, but it is not known how long it…
View article: Validation of scan sampling techniques for nursery pig feeder- and nutritional enrichment use
Validation of scan sampling techniques for nursery pig feeder- and nutritional enrichment use Open
The objective of this study was to validate scan sample accuracy at various predetermined intervals relative to continuous observation of individual nursery pigs interacting with a feeder and nutritional enrichment. A total …
View article: Field report: Methods for assessing laser environmental enrichment application in commercial broilers
Field report: Methods for assessing laser environmental enrichment application in commercial broilers Open
SUMMARY: Sensory environmental enrichment aimed to induce active behavior is sparse in the literature and nonexistent in commercial broiler houses. Laser enrichment previously shown to be successful in stimulating broiler exercise while im…
View article: Validation of Standing and Locomotion Scoring, Behavioral Assessments, and Mechanical Nociceptive Threshold Testing on Naturally Occurring Sow Lameness
Validation of Standing and Locomotion Scoring, Behavioral Assessments, and Mechanical Nociceptive Threshold Testing on Naturally Occurring Sow Lameness Open
The objective of this study was to validate standing and locomotion lameness scoring, mechanical nociceptive threshold testing, and behavioral profile tools for the diagnosis of naturally occurring lameness etiologies in pigs. A total of 5…
View article: Precision livestock farming: a qualitative exploration of swine industry stakeholders
Precision livestock farming: a qualitative exploration of swine industry stakeholders Open
Introduction Precision livestock farming (PLF) technology development has proliferated recently, but on-farm adoption has lagged. Understanding PLF stakeholders’ views, practical applications, limitations, and concerns are necessary to und…
View article: Increased duration of laser environmental enrichment increased broiler physical activity and pen-wide movement without altering tibia measurements
Increased duration of laser environmental enrichment increased broiler physical activity and pen-wide movement without altering tibia measurements Open
Inactivity and leg disorders negatively impact broiler welfare. Enrichment designed to increase barn complexity may encourage physical exercise. The study aim was to implement a second-generation laser enrichment device, previously shown t…
View article: Laser environmental enrichment and Spirulina algae moderately improve Ross 708 broiler performance without reducing welfare
Laser environmental enrichment and Spirulina algae moderately improve Ross 708 broiler performance without reducing welfare Open
Modern commercial broilersare genetically selected for increased growth rate, improved feed efficiency,and a significant proportion of breast muscle tissue. Reducing feed conversionrate and days to market weight are of key interest to the …