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Full-Text Articles in Life Sciences

Design And Validation Of A Mobile Air Filter Testing Laboratory For Animal Agricultural Applications, Benjamin C. Smith, Brett C. Ramirez, Steven J. Hoff, Jay D. Harmon, John P. Stinn Oct 2019

Design And Validation Of A Mobile Air Filter Testing Laboratory For Animal Agricultural Applications, Benjamin C. Smith, Brett C. Ramirez, Steven J. Hoff, Jay D. Harmon, John P. Stinn

Steven J. Hoff

The US swine industry is shifting towards filtered fresh-air ventilation systems that use pleated filters to improve breeding herd health and reduce airborne disease outbreak frequency. Loaded filters reduce airflow causing a poor environment and elevated energy use. Typical axial fans cannot efficiently maintain the rated differential pressure (DP; 100 Pa) for pleated filters; hence, a lower design filter DP (37 Pa) is used and consequently, more filters are required to achieve design maximum ventilation. Large, common filter banks for multiple staged fans presents significant challenges in using continuous DP measurement to assess filter life, making it impossible to separate ...


Infrared Proximity Measurement System Development And Validation For Classifying Sow Posture, Benjamin C. Smith, Brett C. Ramirez, Steven J. Hoff Aug 2019

Infrared Proximity Measurement System Development And Validation For Classifying Sow Posture, Benjamin C. Smith, Brett C. Ramirez, Steven J. Hoff

Steven J. Hoff

The rapidly progressing field of precision livestock farming is becoming increasingly dependent on the utilization of camera technology. Integration of camera technology involves substantial intellectual input and computational power to acquire, process, and interpret images in real-time. Further, cameras and the necessary computational power can be cost-prohibitive and subsequently, become a constraint for application in a commercial livestock and poultry production systems. The purpose of this study is to develop an infrared proximity sensor based system to serve as a substitute a camera system to perform real-time monitoring of sow posture in farrowing stalls for a potentially lower cost and ...


Control Algorithm Development And Simulation For Comparing Evaporative Pads And Sprinklers For Grow-Finish Pigs, Brett C. Ramirez, Steven J. Hoff, Jay D. Harmon Aug 2019

Control Algorithm Development And Simulation For Comparing Evaporative Pads And Sprinklers For Grow-Finish Pigs, Brett C. Ramirez, Steven J. Hoff, Jay D. Harmon

Steven J. Hoff

Seasonal variability attributed to heat stress (HS) has a large economic impact on the US swine industry by reducing daily gain and finishing market weights. Strategies to mitigate HS lack evidence showing effectiveness in different climates and have not been adequately controlled to provide a thermally optimum environment for pigs. Hence, the goal of this study was to describe the initial experimental design and instrumentation as well as develop innovative control algorithms for operating evaporative pads (EPs) and sprinklers. Located in northeast Iowa, a four room (~1,875 head per room) grow-finish facility featured side-by-side rooms separated by a hallway ...


Performance Of Single Point Monitor In Measuring Ammonia And Hydrogen Sulfide Gases, Yi Liang, Hongwei Xin, Steven J. Hoff, Tom L. Richard, Brian J. Kerr Apr 2013

Performance Of Single Point Monitor In Measuring Ammonia And Hydrogen Sulfide Gases, Yi Liang, Hongwei Xin, Steven J. Hoff, Tom L. Richard, Brian J. Kerr

Steven J. Hoff

Performance of Single Point Monitors (SPMs) was evaluated for measuring aerial ammonia (NH3, 0 to 30 ppm) and hydrogen sulfide (H2S, 0 to 90 ppb) under laboratory and field conditions. Calibration gas or NH3/H2S-ladden air at various dew-point temperatures (tdp) were introduced simultaneously to the SPMs under evaluation and a chemiluminescence NH3 analyzer or a pulsed-fluorescence H2S analyzer. Coefficient of variation for “as-is” readings among the SPMs, a measurement of unit interchangeability, was up to 15% for H2S and up to 25% for NH3. Linear relationships existed between readings of the SPMs and those of the respective gas analyzer ...


Air Pollutant Emissions From Confined Animal Buildings (Apecab) Project: Minnesota Data, Larry D. Jacobson, Brian Hetchler, Neslihan Akdeniz, Steven J. Hoff, Albert J. Heber, Ji-Qin Ni, Yuanhui Zhang, Jacek A. Koziel Apr 2013

Air Pollutant Emissions From Confined Animal Buildings (Apecab) Project: Minnesota Data, Larry D. Jacobson, Brian Hetchler, Neslihan Akdeniz, Steven J. Hoff, Albert J. Heber, Ji-Qin Ni, Yuanhui Zhang, Jacek A. Koziel

Steven J. Hoff

To address the need for gas, odor, and particulate matter (PM) emission from animal production buildings, funding was secured in the fall of 2001 by a six-state research team for a USDA project entitled "Air Pollutants Emissions from Confined Animal Buildings," or APECAB. The main objective of the APECAB project was to quantify long-term (yearly) air pollutant emissions from confined animal buildings and establish methodologies for real time measurement of these emissions and build a database of air emissions for US livestock and poultry buildings. The APECAB study was a collaboration of land-grant universities in Minnesota (lead institution), Indiana, Illinois ...


Designing An Objective Static Force Plate To Measure Severity Of Lameness In Multi-Parity Sows, Amanda J. Elsbernd, Anna K. Johnson, Kenneth J. Stalder, Robert F. Fitzgerald, Locke A. Karriker, Steven J. Hoff, Gang Sun Apr 2013

Designing An Objective Static Force Plate To Measure Severity Of Lameness In Multi-Parity Sows, Amanda J. Elsbernd, Anna K. Johnson, Kenneth J. Stalder, Robert F. Fitzgerald, Locke A. Karriker, Steven J. Hoff, Gang Sun

Steven J. Hoff

Lameness is a major reason for culling sows from the commercial breeding herds. Stalder reported that sows culled for feet, leg, and locomotion disorders ranged between 6 to 15 %. In the U. S., commercial sow farms evaluate lameness using subjective methods. An objective and standardize method for assigning lameness scores to a sow would likely be more accurate than subjective scoring measures and provide producers with a useful tool to assess lameness. Therefore, the objective of this study was to design and build a static force plate to measure weight distribution on four legs of a standing sow. Faculty and ...


Case Study Comparison Of Three Styles Of Swine Finishers, Jay D. Harmon, Tom J. Baas, Steven J. Hoff, Hongwei Xin Apr 2013

Case Study Comparison Of Three Styles Of Swine Finishers, Jay D. Harmon, Tom J. Baas, Steven J. Hoff, Hongwei Xin

Steven J. Hoff

Three styles of swine finishing facilities were compared to establish the economic benefit of each style of building. Styles included a curtain-sided finisher, a modified open front finisher, and a cargill unit. Information was collected on energy consumption, water consumption, animal performance, temperature performance, and carcass leanness. Preliminary results indicated the best feed efficiency occurred in the modified open front, whereas the lowest mortality occurred in the curtain-sided finisher. Temperature performance was much tighter in the curtain sided finisher than the other two building styles. A preliminary partial cost comparison indicated that the modified open front facility had the lowest ...


Method And Means For Quasi Ad-Libitum Feeding For Gestation Sows In Loose Housing, Steven J. Hoff, Mark S. Honeyman, James D. Mckean, Dwaine S. Bundy, Fernando Perez-Munoz, Steven E. Bryce, William E. Backhaus Apr 2013

Method And Means For Quasi Ad-Libitum Feeding For Gestation Sows In Loose Housing, Steven J. Hoff, Mark S. Honeyman, James D. Mckean, Dwaine S. Bundy, Fernando Perez-Munoz, Steven E. Bryce, William E. Backhaus

Steven J. Hoff

A gestation sow feeding system has a sow bedding enclosure, a gated scale weighing station, an alley connecting the scale weighing station with two separate feeding pens having entry and exist gates, and a bypass gate connecting the alley and the bedding enclosure. The traffic of sows through the system is monitored and controlled by a computer which controls the gates of the system, measures the weight and average daily gain of each sow weighed, and directs the weighed sow to the feeding pen for a ration of feed to permit the sow to adjust to a targeted average daily ...