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Approachability To A Human In Gilts Divergently Selected For Feed Efficiency, Johanna Sholar, Jessica D. Colpoys, Nicholas K. Gabler, Aileen F. Keating, Suzanne T. Millman, Janice Siegford, Anna K. Johnson Jul 2019

Approachability To A Human In Gilts Divergently Selected For Feed Efficiency, Johanna Sholar, Jessica D. Colpoys, Nicholas K. Gabler, Aileen F. Keating, Suzanne T. Millman, Janice Siegford, Anna K. Johnson

Aileen Keating

The objective of this study was to evaluate approachability of gilts divergently selected for residual feed intake (RFI) to a novel human. Twenty low-RFI and 19 high-RFI gilts were tested using a human approach test. Testing occurred over two consecutive weeks between 1300 and 1900 hours. Gilts were tested individually within a 4.9 x 2.4 m test arena. Throughout the test, latency to first enter, duration of time spent, and frequency of entrances within 1 m and 0.5 m of the human were recorded. These results suggest that divergent selection for RFI did not alter gilt approach ...


Differentially Expressed Genes In Blood From Young Pigs Between Two Swine Lines Divergently Selected For Feed Efficiency: Potential Biomarkers For Improving Feed Efficiency, Haibo Liu, Yet T. Nguyen, Daniel S. Nettleton, Jack C. M. Dekkers, Christopher K. Tuggle Jun 2019

Differentially Expressed Genes In Blood From Young Pigs Between Two Swine Lines Divergently Selected For Feed Efficiency: Potential Biomarkers For Improving Feed Efficiency, Haibo Liu, Yet T. Nguyen, Daniel S. Nettleton, Jack C. M. Dekkers, Christopher K. Tuggle

Dan Nettleton

The goal of this study was to find potential gene expression biomarkers in blood of piglets that can be used to predict pigs’ future feed efficiency. Using RNA-seq technology, we found 453 genes were differentially expressed (false discovery rate (FDR) ≤ 0.05) in the blood of two Yorkshire lines of pigs divergently selected for feed efficiency (FE) based on residual feed intake (RFI). Genes involved in several biosynthetic processes were overrepresented among genes more highly expressed in the low RFI line compared to the high RFI line. Weighted gene co-expression network analysis (WGCNA) also revealed genes involved in some of ...


Winter Grazing Management, Stephen K. Barnhart, James R. Russell, Douglas L. Karlen, Michael J. Tidman Jun 2017

Winter Grazing Management, Stephen K. Barnhart, James R. Russell, Douglas L. Karlen, Michael J. Tidman

Douglas L Karlen

Why winter grazing? Beef cow herd and sheep flock records show that winter feeding costs are livestock producers' single largest production expense. Managing through winter weather while keeping feeding costs low is an essential part of maintaining a profitable operation. Iowa's climate generally allows forage growth only during a 7-to-8 month period. Extending the grazing of this forage--even an extra 3 or 4 weeks in late autumn and winter--is an economical way to maintain or increase livestock profitability. Some producers extend the grazing season by using stockpiled forage, whereas others use crop residue, and many combine the use of ...


Block And Bridle Annual 2016 Jan 2016

Block And Bridle Annual 2016

Block & Bridle Student Organization

Three objectives of the National Block and Bridle Club are to promote animal agriculture through the activities of the club, to supplement students’ study of the animal sciences, and to bring about a closer relationship among students who choose to be a part of the organization. I believe the Block and Bridle club at the University of Nebraska - Lincoln has been successful in accomplishing these goals over the past year and I sincerely thank all of the officers and members who have given their time and effort to make this possible. I am excited to say that our active membership ...


Effects Of Corn Crop Residue Grazing On Soil Physical Properties And Subsequent Soybean Production In A Corn-Soybean Crop Rotation (A Progress Report), Justin Clark, James R. Russell, Douglas Karlen, Darrell Busby, L. James Secor, Brian Peterson, Larry Pellack, Carroll Olsen, Shawn C. Shouse Dec 2015

Effects Of Corn Crop Residue Grazing On Soil Physical Properties And Subsequent Soybean Production In A Corn-Soybean Crop Rotation (A Progress Report), Justin Clark, James R. Russell, Douglas Karlen, Darrell Busby, L. James Secor, Brian Peterson, Larry Pellack, Carroll Olsen, Shawn C. Shouse

Douglas L Karlen

The highest cost to beef cow-calf producers is the feeding of stored feeds in winter months. To lower feed costs, many producers will try to extend the grazing season into the winter. The primary resource for winter grazing in the Midwest is corn crop residues. On the average, corn crop residue grazing will reduce the amount of hay needed to maintain cows by approximately one-half ton per acre grazed over the winter. Although crop residue grazing is quite effective in reducing feed costs, some producers are concerned that corn residue grazing will have an adverse effect on soybean yields the ...


Winter Grazing Of Corn Residues: Effects On Soil Properties And Subsequent Crop Yields From A Corn-Soybean Crop Rotation, W. Darrell Busby, James R. Russell, Douglas L. Karlen, L. James Secor, Brian Peterson, Carroll Olson, Shawn C. Shouse, Dallas L. Maxwell Dec 2015

Winter Grazing Of Corn Residues: Effects On Soil Properties And Subsequent Crop Yields From A Corn-Soybean Crop Rotation, W. Darrell Busby, James R. Russell, Douglas L. Karlen, L. James Secor, Brian Peterson, Carroll Olson, Shawn C. Shouse, Dallas L. Maxwell

Douglas L Karlen

Corn residues could be a good resource for winter cattle grazing. The study investigates whether winter grazing causes soil compaction and yield reduction in crops that are planted following grazing.


Effects Of Corn Crop Residue Grazing On Soil Physical Properties And Subsequent Soybean Production In A Corn–Soybean Crop Rotation, Justin Clark, James R. Russell, Douglas Karlen, W. Darrell Busby, Brian Peterson, Larry Pellack, Dallas L. Maxwell Dec 2015

Effects Of Corn Crop Residue Grazing On Soil Physical Properties And Subsequent Soybean Production In A Corn–Soybean Crop Rotation, Justin Clark, James R. Russell, Douglas Karlen, W. Darrell Busby, Brian Peterson, Larry Pellack, Dallas L. Maxwell

Douglas L Karlen

For three years beginning in 1999, a 96-acre field near Atlantic, Iowa was used to study the effects of corn residue grazing by beef cows on soil characteristics and soybean yields in subsequent years. Each winter, cows were allowed to graze corn crop residues inside selected paddocks in four sub-fields over five monthly periods. To compare the effects of grazing, one paddock was left as an ungrazed control. At the end of grazing in the spring, soil bulk density, moisture content, and penetration resistance were measured inside and 15 ft outside twelve grazing exclosures in each paddock. Soil surface roughness ...


Integrating Experiential Learning Into Animal Science Curriculum Through A Hands-On Beef Cattle Management And Marketing Contest, Corinne J. Harrison Mar 2015

Integrating Experiential Learning Into Animal Science Curriculum Through A Hands-On Beef Cattle Management And Marketing Contest, Corinne J. Harrison

Theses and Dissertations

According to the Illinois Agricultural Education, nearly 61% of students beginning their undergraduate studies in Agriculture at a 2-year college in Illinois come from non-farm backgrounds. Yet, knowledge of and experience in livestock operations is still a requirement for many careers in the animal science industry. In response to this predicament, the Department of Agriculture at Illinois State University has implemented a course that provides students an opportunity to gain hands-on experience with beef cattle management and marketing. The course was designed to enhance learning by requiring students to develop and execute a management and marketing plan for a pen ...


Utilization Of Pork And Pork By-Products For Nutritional And Behavioral Management Of Captive Exotic Felids, Cayla Jo Iske Jan 2015

Utilization Of Pork And Pork By-Products For Nutritional And Behavioral Management Of Captive Exotic Felids, Cayla Jo Iske

Graduate Theses and Dissertations

Currently two protein sources (beef or horse) comprise the majority of raw meat diet formulations for exotic carnivores in zoological institutions. Pork-based diets have traditionally not been fed to managed exotic carnivores, primarily because of microbial and pathogenic concerns, and nutrient digestibility of pork has not been evaluated in captive exotic carnivores, such as felids. Additionally, commercially prepared raw meat diets, while nutritionally complete, rarely meet nonnutritive requirements of cats, such as locating, capturing, and killing prey as well as psychological aspects related to the feeding process, and oral health needs. The pork industry currently sends many by-products to rendering ...


Comparison Of Piglet Birth Weight Classes, Parity Of The Dam, Number Born Alive And The Relationship With Litter Variation And Piglet Survival Until Weaning, Gregory Thomas Krahn Jan 2015

Comparison Of Piglet Birth Weight Classes, Parity Of The Dam, Number Born Alive And The Relationship With Litter Variation And Piglet Survival Until Weaning, Gregory Thomas Krahn

Graduate Theses and Dissertations

The objectives of this study was to determine the relationship between individual piglet birth weight and the odds of survival until weaning and differences due to sow parity. Piglets in this study were purebred Yorkshire (n=70763), purebred Landrace (n=51091), purebred Duroc (n=16834), and Landrace x Yorkshire or Yorkshire x Landrace (n=38447) reciprocal F1 piglets. Data were recorded from sows in four production units within the same genetic flow from September 2009 through November 2013. Piglets were individually weighed and identified within 24 hours of birth and cross-fostering was completed within 48 hours of birth. Survival was ...


Evaluation Of Algae Meal As A Novel Feedstuff For Ruminants, Rebecca Sue Stokes Jan 2015

Evaluation Of Algae Meal As A Novel Feedstuff For Ruminants, Rebecca Sue Stokes

Graduate Theses and Dissertations

Recent advances in technology support the use of heterotrophic microalgae for the production of oils for bioenergy. Oil is extracted and the resultant product includes a combination of both partially deoiled microalgae (PDM) and soyhulls, resulting in an algae meal (ALG) with a unique profile of protein, fiber, and fat. However, this novel feedstuff and the role it may play in the ruminant diet has not been previously characterized. Since PDM is not available commercially to producers separate from soyhulls, the whole product was used for the current research. Thus, the ensuing research trials were designed to: 1) determine the ...


Effects Of Heat Stress Or Ketosis On Metabolism And Inflammatory Biomarkers In Ruminants And Monogastrics, Mohannad Khaled Ali Abuajamieh Jan 2015

Effects Of Heat Stress Or Ketosis On Metabolism And Inflammatory Biomarkers In Ruminants And Monogastrics, Mohannad Khaled Ali Abuajamieh

Graduate Theses and Dissertations

There are several constraints to of the sustainability of the livestock industries in different areas of the world. The two most obvious hurdles to high dairy production are diseases during the transition period and heat stress (HS). Despite decades of research, the actual pathologies of ketosis and HS remain poorly understood. In the US, it was estimated that the economic losses from ketosis is $360/cow/cycle, and to HS was ~ $900 million per year. Thus, both severely jeopardize the competitiveness of animal agriculture. Regardless of the herd size, HS and ketosis affect every dairy region in the country. The ...


Changing Distillers Grains: Implications For Cattle Performance And Management, Erika Linn Lundy Jan 2015

Changing Distillers Grains: Implications For Cattle Performance And Management, Erika Linn Lundy

Graduate Theses and Dissertations

In the past decade, the ethanol industry has begun changing their production processes to capture more value from the corn kernel, altering the nutrient profile of distillers grains (DG). One of the first methods of value extraction includes partial removal of corn oil, resulting in a decreased oil or fat content of DG. Although the majority of ethanol plants are currently extracting oil from DG, limited research has been conducted regarding the use of new generation DG in finishing cattle diets. Previous research with decreased fat DG has shown varying results in cattle performance when compared to traditional DG. The ...


Impact Of Prrs And Ped Viruses On Grower Pig Performance And Intestinal Function, Wesley Paul Schweer Jan 2015

Impact Of Prrs And Ped Viruses On Grower Pig Performance And Intestinal Function, Wesley Paul Schweer

Graduate Theses and Dissertations

Porcine reproductive and respiratory syndrome (PRRSV) and porcine epidemic diarrhea (PEDV) viruses are two of the most economically significant diseases to affect the U.S. swine industry today. Yet, little is known about how they impact pig nutrient digestibility, intestinal function and feed efficiency. Therefore, the overall objective of this thesis was to determine the impact of PRRSV and PEDV viruses, alone or in combination, on grower pig performance, tissue accretion and on intestinal function and integrity. To accomplish these objectives, a series of experiments were conducted and are outlined in three research chapters (Chapter 2, 3 and 4). In ...


Evaluating The Ability Of The Ne System To Predict Growth Performance And Energy Utilization Of Growing Pigs, Jesus Alberto Acosta Camargo Jan 2015

Evaluating The Ability Of The Ne System To Predict Growth Performance And Energy Utilization Of Growing Pigs, Jesus Alberto Acosta Camargo

Graduate Theses and Dissertations

The net energy (NE) system describes the useful energy for growth better than the metabolizable energy (ME) system. Therefore, the NE system should demonstrate a more predictable animal response when a wide range of ingredients are used, but this fact needs to be demonstrated in practice. The objective of this thesis was to evaluate the NE system in diets containing a diverse set of ingredients. Two experiments were conducted: the first experiment consisted of comparing growth performance, carcass characteristics and the efficiency of dietary energy of 2,054 pigs housed in pens in a commercial research barn. Pens were assigned ...


Enhancing Botanical Composition, Wildlife Habitat And Carbon Sequestration Of Pastures In South Central Iowa Through Soil Disturbance By Mob Grazing Of Beef Cattle, James R. Russell, Harris J. Sellers, Stephen Barnhart, Daniel G. Morrical, Helga Offenburger Jan 2015

Enhancing Botanical Composition, Wildlife Habitat And Carbon Sequestration Of Pastures In South Central Iowa Through Soil Disturbance By Mob Grazing Of Beef Cattle, James R. Russell, Harris J. Sellers, Stephen Barnhart, Daniel G. Morrical, Helga Offenburger

Leopold Center Completed Grant Reports

As Iowa pastures continue to be dominated by cool-season grass species, strategic integration of a single mob-grazing event into pasture management offers a tool to simultaneously increase productivity of pastures and to improve grassland wildlife habitat through increased biodiversity. However, the success of the maneuver depends on climate, soil and landscape.


Genetic Markers Found For Response To Heat Stress In Chickens, Angelica G. Bjorkquist, Max F. Rothschild, Michael E. Persia, Chris Ashwell, Carl Schmidt, Susan J. Lamont Jan 2015

Genetic Markers Found For Response To Heat Stress In Chickens, Angelica G. Bjorkquist, Max F. Rothschild, Michael E. Persia, Chris Ashwell, Carl Schmidt, Susan J. Lamont

Animal Industry Report

A unique line of chickens was evaluated for response to heat stress. We measured body temperature, body weight, breast yield, and digestibility. Genomic (DNA) markers were identified by genotyping on the Affymetric 600K array. We conclude that the traits measured during heat stress do have a genetic component. Genomic markers for the response to heat stress have been identified and may be used for breeding more resilient animals.


Accuracy Of Genomic Prediction For Prrs Antibody Response, Nick V. L. Serão, Bob Kemp, Benny Mote, Philip Willson, John Harding, Steve Bishop, Graham Plastow, Jack C. M. Dekkers Jan 2015

Accuracy Of Genomic Prediction For Prrs Antibody Response, Nick V. L. Serão, Bob Kemp, Benny Mote, Philip Willson, John Harding, Steve Bishop, Graham Plastow, Jack C. M. Dekkers

Animal Industry Report

The accuracy of genomic prediction for antibody response to Porcine Reproductive and Respiratory Syndrome (PRRS), measured as S/P ratio, was evaluated using two independent datasets of Landrace x Large White females. Results demonstrate that antibody response during a PRRS outbreak can be predicted with high accuracy using genetic markers in two regions on chromosome 7. One of these regions includes the Major Histocompatibility Complex. The high accuracy for this region indicates that marker effects are consistent across Landrace x Large White populations.


Sequencing A Shrimp Diversity Panel, Emily Kawaler, Max F. Rothschild, Zhiqiang Du Jan 2015

Sequencing A Shrimp Diversity Panel, Emily Kawaler, Max F. Rothschild, Zhiqiang Du

Animal Industry Report

Eighty-six shrimp (eighty Pacific White, six Tiger shrimp) from ten different geographic regions were sequenced with a twofold goal: first, to better understand and document the genetic makeup of the species, and second, to discover genetic differences between shrimp lines that may facilitate the breeding of shrimp with better performance traits


Development And Use Of A Survey Tool To Determine The Efficacy Of Livestock Truck Washes In Iowa, Amber M. Danielson, Anna K. Johnson, Kenneth J. Stalder, Rodney B. Baker, Troy Bigelow, Daniel S. Andersen Jan 2015

Development And Use Of A Survey Tool To Determine The Efficacy Of Livestock Truck Washes In Iowa, Amber M. Danielson, Anna K. Johnson, Kenneth J. Stalder, Rodney B. Baker, Troy Bigelow, Daniel S. Andersen

Animal Industry Report

The transmission of disease among livestock farms could be addressed by the efficiency of truck washes to clean and disinfect trailers used for transporting animals. Collecting swab samples from trailers and cabs of identified truck wash trailers will help to determine the proper procedures and steps needed to reduce the transmission of disease. Truck washes in the state of Iowa were identified and invited to participate in a questionnaire that will provide helpful information for this research. The main goals of this study are to 1) determine the areas in the truck washing process that pose a high risk to ...


Evaluation Of Teat Coverage Persistency And Teat Health For Three Dry Period Persistent Barrier Teat Sealant Dips, Melanie Matti, Alislinn A. Pomfret, Leo L. Timms Jan 2015

Evaluation Of Teat Coverage Persistency And Teat Health For Three Dry Period Persistent Barrier Teat Sealant Dips, Melanie Matti, Alislinn A. Pomfret, Leo L. Timms

Animal Industry Report

Mastitis research has shown that 40-50% of intramammary infections (IMI) are contracted during the dry or non-lactating period with the greatest percentages of these occurring during the first and last two weeks of the dry period. The ability to develop and apply external persistent barrier teat dip products (like a liquid bandage) that can persist for these 1 week periods could decrease IMI, thus improving animal health and performance, and product quality and safety. The objective of this study was to evaluate and compare 3 persistent barrier dry cow teat sealant dips with particular interest and comparisons of dip persistency ...


Estimation Of Haplotype Diversity And Recombination Rate On Chromosomes 5 And 15 In Layer Chickens, Ziqing Weng, Anna Wolc, Jesus Arango, Petek Settar, Janet E. Fulton, Neil P. O'Sullivan, Rohan L. Fernando, Jack C. M. Dekkers, Dorian J. Garrick Jan 2015

Estimation Of Haplotype Diversity And Recombination Rate On Chromosomes 5 And 15 In Layer Chickens, Ziqing Weng, Anna Wolc, Jesus Arango, Petek Settar, Janet E. Fulton, Neil P. O'Sullivan, Rohan L. Fernando, Jack C. M. Dekkers, Dorian J. Garrick

Animal Industry Report

The objectives of this study were to compare the performance of different haplotype reconstruction approaches, characterize haplotype diversity and identify recombination hotspots on chromosomes 5 and 15 in layer chicken. BEAGLE, DAGPHASE, and fastPHASE software recognized fewer haplotypes than two other methods. In total, 10 and 2 recombination hotspots were identified on chromosomes 5 and 15, respectively. Further study is needed to confirm these regions with high recombination rate and high haplotype diversity.


An Experimental Course: Animal Handling, Safety, And Well-Being, Brady M. Mcneil, Heather A. Jennings, Christen G. Jackson, Anna K. Johnson, Jodi A. Sterle Jan 2015

An Experimental Course: Animal Handling, Safety, And Well-Being, Brady M. Mcneil, Heather A. Jennings, Christen G. Jackson, Anna K. Johnson, Jodi A. Sterle

Animal Industry Report

Students in the Department of Animal Science at Iowa State University are coming from increasingly diverse backgrounds, with little to no experience working with or handling various livestock species. In order to best accommodate these students, additional courses are being developed, one of which is Animal Science 190X: Animal Handling, Safety, and Well-Being. Through the course, students handle all major livestock species; sheep, swine, poultry, horses, beef cattle and dairy cattle, and are required to demonstrate handling knowledge and skills learned as part of a final assessment. This creates an opportunity for students lacking a livestock background to feel more ...


Fatty Acid Snp Interaction Analysis In Angus Sired Beef Cattle, Luke M. Kramer, James E. Koltes, Eric R. Fritz-Waters, Mary Sue Mayes, Alysta Markey, Mahdi Saatchi, Nathan T. Weeks, James M. Reecy Jan 2015

Fatty Acid Snp Interaction Analysis In Angus Sired Beef Cattle, Luke M. Kramer, James E. Koltes, Eric R. Fritz-Waters, Mary Sue Mayes, Alysta Markey, Mahdi Saatchi, Nathan T. Weeks, James M. Reecy

Animal Industry Report

The triacylglyceride (TAG) fatty acid content in meat from Angus-sired cattle was analyzed for non-additive genetic effects. A total of 11,482 significant DNA marker interactions (false discovery rate [FDR] < 0.05) were detected across thirty-seven different TAG fatty acids. Interactions were not evenly distributed amongst all fatty acids analyzed, and types of interactions (additive-by-additive, additive-by-dominance, and dominance-by-dominance) varied within each individual fatty acid. These results indicate that it may be possible to account for additional genetic variance amongst TAG fatty acids over and above individual markers.


Effects Of Blast Chilling On Fresh Pork Quality In Chops From The Longissimus Dorsi, Aaron M. Blakely, Edward M. Steadham, Kenneth J. Prusa, Christine A. Fedler, Elisabeth J. Huff-Lonergan, Steven M. Lonergan Jan 2015

Effects Of Blast Chilling On Fresh Pork Quality In Chops From The Longissimus Dorsi, Aaron M. Blakely, Edward M. Steadham, Kenneth J. Prusa, Christine A. Fedler, Elisabeth J. Huff-Lonergan, Steven M. Lonergan

Animal Industry Report

Carcasses (n=40) with defined fat free lean and carcass weight were selected 45 minutes postmortem. Carcasses were split, and sides subjected to conventional or blast chilling regimens. Sides that were blast chilled had Longissimus dorsi (LD) chops with slower pH decline, greater cook loss and greater Warner-Bratzler Shear force than chops from conventionally chilled sides. These results demonstrate that current blast chilling practices have the potential to negatively impact pork tenderness.


Characterization Of The F94l Double Muscling Mutation In Pure- And Crossbred Limousin Animals, Jungjae Lee, Hailin Su, Rohan L. Fernando, Dorian J. Garrick, Jeremy Taylor Jan 2015

Characterization Of The F94l Double Muscling Mutation In Pure- And Crossbred Limousin Animals, Jungjae Lee, Hailin Su, Rohan L. Fernando, Dorian J. Garrick, Jeremy Taylor

Animal Industry Report

The objective of this study was to investigate the nature of the effect of the F94L variant in the myostatin (MSTN) gene on economic traits in Limousin and Limousin-Angus crossbred animals in the context of genomic analyses using Illumina BovineSNP50 Bead chip genotypes.


Effect Of Estrus Activity When Evaluating Feed Efficiency In Heifers, Garland R. Dahlke, Patrick J. Gunn Jan 2015

Effect Of Estrus Activity When Evaluating Feed Efficiency In Heifers, Garland R. Dahlke, Patrick J. Gunn

Animal Industry Report

Estrus activity in virgin heifers tends to affect the outcome in measurements observed during performance and feed utilization tests. Prior to any testing it is prudent to identify those females that have shown estrus activity consistently and those which have not, then evaluate animals for feed efficiency grouped by stage of sexual maturity.


Effect Of Trace Mineral Injection And Optaflexx On Growth Performance And Carcass Characteristics Of Finishing Cattle, Olivia N. Genther-Schroeder, Christopher A. Clark, Stephanie L. Hansen Jan 2015

Effect Of Trace Mineral Injection And Optaflexx On Growth Performance And Carcass Characteristics Of Finishing Cattle, Olivia N. Genther-Schroeder, Christopher A. Clark, Stephanie L. Hansen

Animal Industry Report

Utilizing a trace mineral (TM) injection approximately 90 d prior to harvest may improve growth performance and carcass characteristics when the β-agonist Optaflexx is not used. This may provide a unique opportunity for TM injection to be used in natural programs, to avoid the use of β-agonists, but still maintain high rates of growth. However, using a TM-injection only 28 d prior to harvest appears to have no additional benefit, and may decrease carcass quality.


Changes In The Protein Profile Of Porcine Liver In Response To Immune System Stimulation, Amanda C. Outhouse, Kyle Grubbs, Christopher K. Tuggle, Jack C. M. Dekkers, Nicholas K. Gabler, Steven M. Lonergan Jan 2015

Changes In The Protein Profile Of Porcine Liver In Response To Immune System Stimulation, Amanda C. Outhouse, Kyle Grubbs, Christopher K. Tuggle, Jack C. M. Dekkers, Nicholas K. Gabler, Steven M. Lonergan

Animal Industry Report

Immune system function has a direct influence on swine growth. Using lipopolysaccharide (LPS) to stimulate the immune system of pigs provides insight on how they handle immunological stress. Several proteins were shown to be part of the liver’s response to LPS. These proteins included heat shock protein (HSP) 60, HSP70, and peroxiredoxin-2. Changes in the abundance of these proteins indicate the extent to which an animal can respond to this immune system stimulation (ISS). Proteins responsible for cellular rescue were found to be increased in abundance in pigs with stimulated immune systems.


Effects Of Label Dose Permethrin Use In Yearling Angus Beef Bulls On Reproductive Function And Testicular Histopathology, Tyler M. Dohlman, Patrick E. Phillips, Darin M. Madson, Christopher A. Clark, Patrick J. Gunn Jan 2015

Effects Of Label Dose Permethrin Use In Yearling Angus Beef Bulls On Reproductive Function And Testicular Histopathology, Tyler M. Dohlman, Patrick E. Phillips, Darin M. Madson, Christopher A. Clark, Patrick J. Gunn

Animal Industry Report

To eliminate the potential for insect borne diseases and improve productivity in cow-calf operations, many producers use pour-on pyrethroids. However, popular press literature has identified potential links between use of pyrethroids and reproductive function failures in bulls. While literature in mice and rats have reported potential endocrine disruption of sex steroids resulting from pyrethroid exposure, effects of pyrethroid use on bull fertility is still questionable. The objective of this study was to measure reproductive parameters in peripubertal Angus bulls using a commonly used pyrethroid pour-on. We hypothesized that use of a pyrethroid pour-on at labeled dose would have limited effects ...