Open Access. Powered by Scholars. Published by Universities.®

Life Sciences Commons

Open Access. Powered by Scholars. Published by Universities.®

Articles 1 - 30 of 39

Full-Text Articles in Life Sciences

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.


Demonstrating Farrowing Alternatives For Small-Farms: Insulated Tents For Sows And Pigs, Project Summary, Peter J. Lammers, Jay D. Harmon, Lyle T. Rossiter, Mark S. Honeyman Jan 2015

Demonstrating Farrowing Alternatives For Small-Farms: Insulated Tents For Sows And Pigs, Project Summary, Peter J. Lammers, Jay D. Harmon, Lyle T. Rossiter, Mark S. Honeyman

Animal Industry Report

Farmers raising pigs for niche markets are usually prohibited from using farrowing crates and must provide bedding and greater space per sow than typical commodity production. Because current consumer expectations dictate that pigs be produced year-round, crate-free farrowing options for cold weather are necessary and many niche pork companies will not accept new producers into their program unless they agree to farrow pigs during winter months. Several crate-free farrowing systems for cold weather have been demonstrated in Iowa, however those alternatives generally require a permanent, well-insulated structure and/or tremendous amounts of energy to provide a suitable environment for the ...


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 ...


Mortality Rate Of Weaned And Feeder Pigs As Affected By Ground Transportation Conditions, Yang Zhao, Hongwei Xin, Jay D. Harmon, Steven J. Hoff, Thomas J. Baas Jul 2014

Mortality Rate Of Weaned And Feeder Pigs As Affected By Ground Transportation Conditions, Yang Zhao, Hongwei Xin, Jay D. Harmon, Steven J. Hoff, Thomas J. Baas

Agricultural and Biosystems Engineering Conference Proceedings and Presentations

Ground transportation of pigs at early ages is typical in modern swine production because the young animals are often produced in one part of the country and finished in another. One challenge associated with this practice is the profit-stripping incidence of mortality and compromised animal welfare due to stress stemming from unfavorable transporting conditions. The objective of this study was to examine possible causative relationships of mortality rate of weaned and feeder pigs to ground transportation conditions. Records of weaned and feeder pig transportation for the period of April 2012 – January 2014 were provided by a U.S. swine ...


Analytical Methods For Chemical And Sensory Characterization Of Scent-Markings In Large Wild Mammals: A Review, Simone B. Soso, Jacek A. Koziel, Anna K. Johnson, Young Jin Lee, W. Sue Fairbanks Mar 2014

Analytical Methods For Chemical And Sensory Characterization Of Scent-Markings In Large Wild Mammals: A Review, Simone B. Soso, Jacek A. Koziel, Anna K. Johnson, Young Jin Lee, W. Sue Fairbanks

Agricultural and Biosystems Engineering Publications

In conjoining the disciplines of “ethology” and “chemistry” the field of “Ethochemistry” has been instituted. Ethochemistry is an effective tool in conservation efforts of endangered species and the understanding of behavioral patterns across all species. Chemical constituents of scent-markings have an important, yet poorly understood function in territoriality, reproduction, dominance, and impact on evolutionary biology, especially in large mammals. Particular attention has recently been focused on scent-marking analysis of great cats (Kalahari leopards (Panthera pardus), puma (Puma concolor) snow leopard (Panthera uncia), African lions (Panthera leo), cheetahs (Acinonyx jubatus), and tigers (Panthera tigris)) for the purpose of conservation. Sensory analyses ...


Predicting Time Cattle Spend In Streams To Quantify Direct Deposition Of Manure, Shannon B. Brown, Charles D. Ikenberry, Michelle L. Soupir, Justin J. Bisinger, James R. Russell Jan 2014

Predicting Time Cattle Spend In Streams To Quantify Direct Deposition Of Manure, Shannon B. Brown, Charles D. Ikenberry, Michelle L. Soupir, Justin J. Bisinger, James R. Russell

Agricultural and Biosystems Engineering Publications

Current methods to predict bacterial loads into streams resulting from direct deposition of manure by livestock do not consider factors that influence livestock behavior. Data from three studies that monitored spatial behavior of cattle through GPS were used to develop a new method with increased temporal resolution and consideration of environmental factors to predict the time that cattle spend in streams. Information on relative location of the cattle to the pasture stream was used to calculate the number of hours a cow spent in the stream, and from that the load of bacteria deposited directly into the stream. Ultimately, four ...


Corn Grown Under Drought-Stressed Conditions Does Not Have Lower Energy Content Than Corn Grown In A Previous “Normal” Year, Monica A. Newman, John F. Patience, Charles R. Hurburgh Jan 2014

Corn Grown Under Drought-Stressed Conditions Does Not Have Lower Energy Content Than Corn Grown In A Previous “Normal” Year, Monica A. Newman, John F. Patience, Charles R. Hurburgh

Animal Industry Report

Record-breaking heat and lack of rainfall during the 2012 growing season resulted in drought-stressed growing conditions. An experiment was conducted to investigate the impact of these conditions on nutrient composition and apparent total tract digestibilities (ATTD) of energy in corn, and determine if relationships exist between corn quality measurements, nutrient content, and digestibility of energy. Twenty-eight samples of corn from the 2012 crop, plus 2 samples of corn from the 2011 crop to serve as a positive control, were collected across the Midwest using yield as an initial screen for drought impact. Each sample was graded by an official U ...


Demonstrating Farrowing Alternatives For Small-Farms: Insulated Tents For Sows And Pigs, Year One, Peter J. Lammers, Jay D. Harmon, Lyle T. Rossiter, Mark S. Honeyman Jan 2014

Demonstrating Farrowing Alternatives For Small-Farms: Insulated Tents For Sows And Pigs, Year One, Peter J. Lammers, Jay D. Harmon, Lyle T. Rossiter, Mark S. Honeyman

Animal Industry Report

Farmers raising pigs for niche markets are usually prohibited from using farrowing crates and must provide bedding and greater space per sow than typical commodity production. Because current consumer expectations dictate that pigs be produced year-round, crate-free farrowing options for cold weather are necessary and many niche pork companies will not accept new producers into their program unless they agree to farrow pigs during winter months. Several crate-free farrowing systems for cold weather have been demonstrated in Iowa, however those alternatives generally require a permanent, well-insulated structure and/or tremendous amounts of energy to provide a suitable environment for the ...


Mixing Beef Feed Rations Containing Distillers Wet Grains, Nathan J. Schuler, Carl J. Bern, Daniel D. Loy, Thomas J. Brumm, Daryl R. Strohbehn Jan 2014

Mixing Beef Feed Rations Containing Distillers Wet Grains, Nathan J. Schuler, Carl J. Bern, Daniel D. Loy, Thomas J. Brumm, Daryl R. Strohbehn

Agricultural and Biosystems Engineering Publications

The flexibility of distillers grains has made it a major substitute for corn in beef feed rations. However, producers are having issues with feeding wet distillers grains. This study addresses three major mixing conditions: ingredient addition order, mixing time, and mixer design. The addition orders considered were hay-corn-protein-DWG and hay-DWG-protein-corn. Horizontal and vertical mixers were tested at mix times of 3, 5, and 7 min mixing a beef finishing ration containing wet distillers grains. Test results were obtained using total mixed ration and Pennsylvania State University Particle Separator analyses. Results showed that the 3-min mixing time is sufficient, thus when ...


The Isu Compost Facility After Four Years, Steve J. Jonas, Timothy R. Goode, Kapil Arora, Mark S. Honeyman Jan 2013

The Isu Compost Facility After Four Years, Steve J. Jonas, Timothy R. Goode, Kapil Arora, Mark S. Honeyman

Iowa State Research Farm Progress Reports

The University Compost Facility has completed four full years of operation. The facility is managed by the ISU Research Farms and has a separate revolving account that receives fees and sales and pays expenses. The facility is designed to be self-supporting, i.e. not receive allocations for its operations. The facility is located at 52274 260th Street, Ames, Iowa.


Validation Of A Lameness Model In Sows Using Physiological And Mechanical Measurements, Locke A. Karriker, Caitlyn E. Abell, Monique D. Pairis-Garcia, Whitney A. Holt, Gang Sun, Johann F. Coetzee, Anna K. Johnson, Steven J. Hoff, Kenneth J. Stalder Jan 2013

Validation Of A Lameness Model In Sows Using Physiological And Mechanical Measurements, Locke A. Karriker, Caitlyn E. Abell, Monique D. Pairis-Garcia, Whitney A. Holt, Gang Sun, Johann F. Coetzee, Anna K. Johnson, Steven J. Hoff, Kenneth J. Stalder

Agricultural and Biosystems Engineering Publications

The objective of this study was to develop a validated, transient, chemically induced lameness model in sows using subjective and objective lameness detection tools. Experiment 1 determined an effective joint injection technique based on volume and placement of dye using feet collected from 9 finisher pigs and 10 multiparity cull sow carcasses. Experiment 2 confirmed the injection technique in live animals and produced a transient clinical lameness in 4 anesthetized sows injected with amphotericin B (15 mg/mL) in the distal interphalangeal joints of the claw. Clinical lameness was assessed by a categorical lameness scoring system, and a postmortem visual ...


Energy Use In Pig Production: An Examination Of Current Iowa Systems, Peter J. Lammers, M. Douglas Kenealy, James B. Kliebenstein, Jay D. Harmon, Matthew J. Helmers, Mark S. Honeyman Mar 2012

Energy Use In Pig Production: An Examination Of Current Iowa Systems, Peter J. Lammers, M. Douglas Kenealy, James B. Kliebenstein, Jay D. Harmon, Matthew J. Helmers, Mark S. Honeyman

Agricultural and Biosystems Engineering Publications

This paper compares energy use for different pig production systems in Iowa, a leader in US swine production. Pig production systems include not only the growth and performance of the pigs, but also the supporting infrastructure of pig production. This supporting infrastructure includes swine housing, facility management, feedstuff provision, swine diets, and manure management. Six different facility type × diet formulation × cropping sequence scenarios were modeled and compared. The baseline system examined produces 15,600 pigs annually using confinement facilities and a corn-soybean cropping sequence. Diet formulations for the baseline system were corn-soybean meal diets that included the synthetic AA L-lysine ...


The University Compost Facility After Three Years, Steve J. Jonas, Timothy R. Goode, Kapil Arora, Mark S. Honeyman Jan 2012

The University Compost Facility After Three Years, Steve J. Jonas, Timothy R. Goode, Kapil Arora, Mark S. Honeyman

Iowa State Research Farm Progress Reports

The University Compost Facility, 52274 260th St., Ames, Iowa has completed three full years of operation. The facility is managed by the ISU Research Farms and has a separate revolving account that receives fees and sales, and pays expenses. The facility is designed to be self-supporting, i.e. not receive allocations for its operations. The facility consists of seven, 80 × 140 ft hoop barns and a new 55 × 120 ft hoop barn, all with paved floors. The facility also has a Mettler-Toledo electronic scale with a 10 ft × 70 ft platform to weigh all materials. Key machinery is 1 ...


Iowa Hoop Structures Used For Confined Beef Cattle Feeding: A Survey, Mark S. Honeyman, Jay D. Harmon Jan 2011

Iowa Hoop Structures Used For Confined Beef Cattle Feeding: A Survey, Mark S. Honeyman, Jay D. Harmon

Iowa State Research Farm Progress Reports

Beginning in the mid-1990s, hoop structures became available to Iowa farmers as an alternative housing system for livestock, primarily swine. Iowa State University was very active in research and demonstrations of hoop barns for swine. ISU also built hoop barns for calving at the ISU Rhodes Research Farm, Rhodes, IA in about 2000. From this work, in 2004/05 ISU built one of the first hoop barns for cattle feeding at the ISU Armstrong Research Farm, Lewis, IA. Frequently, questions are asked about the acceptance of hoop barns for beef cattle and how many beef cattle hoop barns are in ...


Rapid Determination Of Pork Sensory Quality Using Raman Spectroscopy, Qi Wang, Steven M. Lonergan, Chenxu Yu Jun 2010

Rapid Determination Of Pork Sensory Quality Using Raman Spectroscopy, Qi Wang, Steven M. Lonergan, Chenxu Yu

Agricultural and Biosystems Engineering Conference Proceedings and Presentations

Currently existing objective methods to evaluate tenderness and chewiness of pork in general do not yield satisfactory correlation to sensory panel evaluations, and their applications in meat industry are hence limited. In this study, a Raman spectrosensing method was developed to evaluate and predict tenderness and chewiness of pork loins. Raman spectroscopic binary barcodes for pork loins from 169 pigs were created based on their spectroscopic characteristics, and multivariate statistical discriminant model was developed based on the Raman barcodes to differentiate and classify pork loins into tenderness grades. Good agreement (> 82% correct predictions) with sensory panel results were obtained especially ...


Nonsolar Energy Use And One-Hundred-Year Global Warming Potential Of Iowa Swine Feedstuffs And Feeding Strategies, Peter J. Lammers, M. Douglas Kenealy, James B. Kliebenstein, Jay D. Harmon, Matthew J. Helmers, Mark S. Honeyman Mar 2010

Nonsolar Energy Use And One-Hundred-Year Global Warming Potential Of Iowa Swine Feedstuffs And Feeding Strategies, Peter J. Lammers, M. Douglas Kenealy, James B. Kliebenstein, Jay D. Harmon, Matthew J. Helmers, Mark S. Honeyman

Agricultural and Biosystems Engineering Publications

Demand for nonsolar energy and concern about the implications of fossil fuel combustion have encouraged examination of energy use associated with agriculture. The United States is a global leader in pig production, and the United States swine industry is centered in Iowa. Feed is the largest individual input in pig production, but the energy consumption of the Iowa swine feed production chain has yet to be critically examined. This analysis examines nonsolar energy use and resulting 100-yr global warming potential (GWP) associated with the swine feed production chain, beginning with cultivation of crops and concluding with diet formulation. The nonsolar ...


Beef Cattle Feeding In A Bedded Hoop Barn: Three Year Summary, Mark S. Honeyman, Anna K. Butters-Johnson, Jay D. Harmon, Dallas L. Maxwell, Darrell Busby, Shawn C. Shouse Jan 2009

Beef Cattle Feeding In A Bedded Hoop Barn: Three Year Summary, Mark S. Honeyman, Anna K. Butters-Johnson, Jay D. Harmon, Dallas L. Maxwell, Darrell Busby, Shawn C. Shouse

Iowa State Research Farm Progress Reports

Iowa’s beef cattle industry is comprehensively evaluating the environmental management of feedlots. As the Iowa cattle feeding industry focuses on environmental management, there has been increasing interest in systems where runoff is minimized, such as a bedded hoop barn. A three-year study evaluating the performance of yearling steers in a bedded hoop barn was conducted.


Flooding And Stored Grain, Charles R. Hurburgh, Daniel D. Loy Jun 2008

Flooding And Stored Grain, Charles R. Hurburgh, Daniel D. Loy

Integrated Crop Management News

Floodwaters have soaked many grain bins on farms and at commercial elevators. With only a few exceptions, flood soaked grain is not useable for feed or food. Flooding affects both the stored grain and the storage structures.


Performance Of Gestating Sows In Bedded Hoop Barns And Confinement Stalls, Peter J. Lammers, Mark S. Honeyman, John W. Mabry, Jay D. Harmon May 2007

Performance Of Gestating Sows In Bedded Hoop Barns And Confinement Stalls, Peter J. Lammers, Mark S. Honeyman, John W. Mabry, Jay D. Harmon

Agricultural and Biosystems Engineering Publications

The effects of gestation housing systems on sow and litter performance were evaluated for 2.5 yr in southwest Iowa. Gestation housing system treatments were as follows: 1) individual gestation stalls in a mechanically ventilated confinement building with a partially slatted floor and a manure flush system and 2) group pens with individual feed stalls in deep-bedded, naturally ventilated hoop barns. In all, 957 litters from 353 sows were evaluated. Number of pigs born alive per litter differed for the 2 housing treatments (P = 0.002). Sows gestated in hoop barns gave birth to more live pigs per litter (10 ...


Comparison Of Alternative Winter Farrowing Techniques On Four Niman Ranch Cooperating Farms In Southern Minnesota, David Serfling, Mark S. Honeyman, Jay D. Harmon Jan 2006

Comparison Of Alternative Winter Farrowing Techniques On Four Niman Ranch Cooperating Farms In Southern Minnesota, David Serfling, Mark S. Honeyman, Jay D. Harmon

Iowa State Research Farm Progress Reports

Swine farmers interested in enrolling in the growing niche markets for alternatively-reared pigs must usually farrow during the winter. The niche markets have a shortage of winter-born pigs because it is the most difficult time to meet the standards of no farrowing crates, use of bedding, and no antibiotics. The purpose of this study is to document alternative winter farrowing on four farms in southern Minnesota.


Alternative Winter Farrowing Demonstration Project: Two-Year Summary, Peter J. Lammers, Mark S. Honeyman, Jay D. Harmon Jan 2005

Alternative Winter Farrowing Demonstration Project: Two-Year Summary, Peter J. Lammers, Mark S. Honeyman, Jay D. Harmon

Iowa State Research Farm Progress Reports

There is growing demand in Iowa for pigs raised outdoors or in a deep-bedded system without the use of antibiotics, growth promotants, or animal by-products. Currently, most producers selling naturally raised pork market their animals to a company that requires adherence to the Animal Welfare Institute’s (AWI) Animal Welfare Standards. One of the key components of these standards is the prohibition of farrowing crates. While a pasture farrowing system is effective during spring, summer, and fall, an alternative system is needed to farrow pigs in the winter for the naturally raised pork market.


Nitrogen Excretion And Ammonia Emissions From Pigs Fed Reduced Crude Protein Diets Or Yucca Extract, D. M. Panetta, Wendy J. Powers, Hongwei Xin, Brian J. Kerr Jan 2005

Nitrogen Excretion And Ammonia Emissions From Pigs Fed Reduced Crude Protein Diets Or Yucca Extract, D. M. Panetta, Wendy J. Powers, Hongwei Xin, Brian J. Kerr

Animal Industry Report

Dietary strategies are an important part of management systems designed to reduce ammonia emitted from animal feeding operations. Two potential strategies (reducing dietary crude protein content and adding yucca extract to the diet) were evaluated in two swine feeding trials. Three groups of pigs were housed in environmental chambers in order to allow for direct measurement of ammonia emissions. Emission rates and excreta nitrogen and ammonium concentrations were analyzed. Feeding a diet with four amino acids resulted in large though nonsignificant reductions in ammonia emissions, and affected excreta nitrogen concentrations; increasing urinary ammonium-N while decreasing urinary and fecal total nitrogen ...


Management Impacts On Ammonia Volatilization From Swine Manure, D. M. Panetta, Wendy J. Powers, Jeffrey C. Lorimor Jan 2005

Management Impacts On Ammonia Volatilization From Swine Manure, D. M. Panetta, Wendy J. Powers, Jeffrey C. Lorimor

Animal Industry Report

Ammonia released from swine manure into the air is becoming an increasingly controversial topic in Iowa. This experiment was conducted to evaluate the potential of several management strategies to reduce ammonia volatilization from swine manure over time. In six benchtop trials using twenty-four 1-L manure storage vessels, treatments were applied to the vessels, and manure and air samples were analyzed for concentrations of ammonia and other forms of nitrogen. Segregated storage of urine and feces, keeping manure cool and still, addition of yucca extract, and acidification reduced ammonia volatilization.


Impacts Of Cattle Grazing Management On Sediment And Phosphorus Loads In Surface Waters, M. M. Haan, J. R. Russell, Wendy J. Powers, J. L. Kovar, J. L. Boehm, Steven K. Mickelson, R. Schultz Jan 2005

Impacts Of Cattle Grazing Management On Sediment And Phosphorus Loads In Surface Waters, M. M. Haan, J. R. Russell, Wendy J. Powers, J. L. Kovar, J. L. Boehm, Steven K. Mickelson, R. Schultz

Animal Industry Report

In 2001 (yr 1), 2002 (yr 2), and 2003 (yr 3), three blocks of five 1-ac paddocks were grazed by beef cows on hills at the Iowa State University Rhodes Research and Demonstration Farm to determine the effects of grazing management on phosphorus (P) and sediment runoff from pastureland. Grazing management treatments included an ungrazed control (UG), summer hay harvest with winter stockpiled grazing (HS), grazing by continuous stocking to a residual sward height of 2 in. (2C), rotational stocking to a residual sward height of 2 in. (2R), and rotational stocking to a residual sward height of 4 in ...


Beef Cattle Feeding In A Deep Bedded Hoop Barn: A Preliminary Report, Mark S. Honeyman, Jay D. Harmon, Shawn C. Shouse, Darrell Busby, Dallas L. Maxwell Jan 2005

Beef Cattle Feeding In A Deep Bedded Hoop Barn: A Preliminary Report, Mark S. Honeyman, Jay D. Harmon, Shawn C. Shouse, Darrell Busby, Dallas L. Maxwell

Animal Industry Report

There is growing concern about more intensive runoff and environmental regulations for open beef cattle feedlots, particularly in the higher rainfall cattle feeding states like Iowa. A low-cost, versatile bedded hoop barn for feeding cattle may be a possible solution to this situation. The objective of this study is to quantify the environment in a bedded hoop used for finishing beef cattle and to compare beef cattle performance in hoops to conventional open feedlots.

In order to compare bedded hoop barns to outside feedlots for beef cattle feeding, a hoop barn (50 x 120 ft) is being constructed at the ...


Alternative Winter Farrowing Demonstration Project: Two Year Summary, Peter J. Lammers, Mark S. Honeyman, Jay D. Harmon Jan 2005

Alternative Winter Farrowing Demonstration Project: Two Year Summary, Peter J. Lammers, Mark S. Honeyman, Jay D. Harmon

Animal Industry Report

There is growing demand in Iowa for pigs raised outdoors or in a deep-bedded system without the use of antibiotics, growth promotants, or animal by-products. Currently, most producers selling naturally-raised pork, market their animals to a company that requires adherence to the Animal Welfare Institute’s (AWI) Animal Welfare Standards. One of the key components of these standards is the prohibition of farrowing crates. While a pasture farrowing system is effective during spring, summer, and fall, an alternative system is needed to farrow pigs in the winter for the naturally-raised pork market.

There are a variety of farrowing systems currently ...


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 Jan 2004

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

Leopold Center Completed Grant Reports

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.


Alternative Winter Farrowing Demonstration: A Progress Report, Peter J. Lammers, Mark S. Honeyman, Jay D. Harmon Jan 2004

Alternative Winter Farrowing Demonstration: A Progress Report, Peter J. Lammers, Mark S. Honeyman, Jay D. Harmon

Iowa State Research Farm Progress Reports

Development of systems enabling producers to capture premiums offered by niche markets is of great interest to many Iowa farmers. Of key concern is a winter farrowing system that is both economical to operate and meets the criteria of natural pork buyers. This report details the results from the alternative winter farrowing system demonstrated at the ISU Allee Demonstration Farm near Newell during the winter of 2002/2003.


Impacts Of Cattle Grazing Management On Sediment And Phosphorus Loads In Surface Waters, Mathew M. Haan, James R. Russell, Wendy Powers, John Kovar, Richard C. Schultz, Steven K. Mickelson Jan 2004

Impacts Of Cattle Grazing Management On Sediment And Phosphorus Loads In Surface Waters, Mathew M. Haan, James R. Russell, Wendy Powers, John Kovar, Richard C. Schultz, Steven K. Mickelson

Iowa State Research Farm Progress Reports

The amounts of sediment and phosphorus (P) in water runoff from agricultural lands are of concern because of the potential for siltation and eutrophication of surface waters. There is limited information about the total sediment and P loads in runoff from pastureland in the Midwest. Because vegetation limits soil disruption caused by the impact of raindrops and forage roots hold soil particles, pastures grazed using suitable management practices should maintain water infiltration and minimize sediment and P losses in water runoff. Once sediment and P have been dislodged from the landscape, vegetative buffers can be an effective tool for reducing ...


Air Quality And Animal Agriculture, Angela M. Rieck-Hinz, Jeffery C. Lorimor, Wendy J. Powers, Hongwei Xin Mar 2003

Air Quality And Animal Agriculture, Angela M. Rieck-Hinz, Jeffery C. Lorimor, Wendy J. Powers, Hongwei Xin

Agriculture and Environment Extension Publications

Air quality and potential gaseous emission from animal feeding operations (AFOs) are a concern among Iowans. Rural residents are concerned with odors and emissions from AFOs that may affect their health, property values, and the environment. Livestock producers are concerned with possible effects on their own family members and employees, the environment, and the health and productivity of the livestock.