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Articles 1 - 30 of 110
Full-Text Articles in Life Sciences
Forage Spokesman Information, Lowell J. Clifford, Barry Drury, John Mcglone, Mac Stone
Forage Spokesman Information, Lowell J. Clifford, Barry Drury, John Mcglone, Mac Stone
Kentucky Grazing Conference
No abstract provided.
Techniques For Reducing Mud Problems And Improving Pasture Abused Areas, Ken Johnson
Techniques For Reducing Mud Problems And Improving Pasture Abused Areas, Ken Johnson
Kentucky Grazing Conference
I would like to approach this topic from two directions, mud control and then problem areas. Mud control in concentrated areas almost impossible with forages alone. Using a mud control product is usually advised. I will talk about several.
My Experiences With Summer Lovegrass, Tim Phillips
My Experiences With Summer Lovegrass, Tim Phillips
Kentucky Grazing Conference
I first heard about teff (Eragrostis tef) being used as a hay crop in early 2006 at a meeting near the Shenandoah Valley area of Virginia. The meeting was about orchardgrass production, so I was speaking about new varieties that are available for producers to grow. Several farmers had experienced massive stand losses of their established orchardgrass hay fields, so they had tried this ‘new’ summer annual grass. Some of the farmers were surprised that I knew about this grass, but I didn’t know about its use as a hay or pasture grass. Teff is the Ethiopian name for a …
Experiences With "Teff" (Summer Love Grass) In Kentucky, Bob Jaynes
Experiences With "Teff" (Summer Love Grass) In Kentucky, Bob Jaynes
Kentucky Grazing Conference
Following publicity about the Klamath Experiment Station evaluation of Teff as an annual forage in 2003 and 2004, requests for more information and seed sources kept KES staff busy for weeks last spring. We received over 300 contacts from 41 states. Local seed salesman Laverne Hankins processed over 150 orders for more than 5 tons of seed. Those who received seed were sent a questionnaire this fall in hopes that we would get feedback on growers experience with this new forage species. To date we have received responses from about 15 growers.
Options For Summer Grazing, David C. Ditsch
Options For Summer Grazing, David C. Ditsch
Kentucky Grazing Conference
Summer is the time during the growing season when shortages of forage most often occur in Kentucky. The summer of 2007 will long be remembered as one the warmest and driest in recent years and cause many livestock producers to evaluate their current forage systems. Most Kentucky pastures are predominately cool-season grasses such as tall fescue, orchardgrass and bluegrass. During the historically hot, dry periods in July and August, these species produce very little growth and can quickly become overgrazed. At this point, some producers have no alternative except to buy feed or begin feeding stored forage intended for winter …
Surviving The 2007 Drought, Roy Burris
Surviving The 2007 Drought, Roy Burris
Kentucky Grazing Conference
Kentucky beef producers could feel the effects of the ’07 drought for a long time. Decisions made now will impact the ’08 and ’09 calf crops. The current hay/feed shortage has stimulated a lot of “panic buying”. Feedstuffs with very low nutritive values are being purchased at an alarming rate. These “feeds” are being purchased at much higher costs than we normally pay for good quality hay. If properly supplemented, they can be used successfully. However, their use to replace the normal hay supply could have disastrous results.
Does Grazing Method Matter?, Garry D. Lacefield
Does Grazing Method Matter?, Garry D. Lacefield
Kentucky Grazing Conference
Interest in and opportunities for grazing continues to increase not only in Kentucky, but throughout the U.S. In Wisconsin, 12% or approximately 5000 dairymen are now using grazing. In Michigan, over 40% of the dairymen are using grazing for a significant part of their feed requirements. Over 15% of these dairymen are using intensive grazing. Similar numbers exist for Pennsylvania.
Recovering From The "Freeze" And "Drought" Of 2007, S. Ray Smith
Recovering From The "Freeze" And "Drought" Of 2007, S. Ray Smith
Kentucky Grazing Conference
As all of you know, 2007 has been a devastating year for forage agriculture in Kentucky. The season started with an abnormally warm 7 weeks during late winter and early spring, which promoted lush vegetative growth. Normally this would have been a “good thing”, but it actually made forage plants more vulnerable to below freezing temperatures. Then the severe freeze occurred, with April 7, 8, and 9 the coldest 3 day period in April in KY history. Pastures were stunted for weeks and first cut hay yields were reduced by 35 to 100%. At this point we were still hopeful …
Foreword And Kfgc Award Winners [2007], Garry D. Lacefield, Christi L. Forsythe
Foreword And Kfgc Award Winners [2007], Garry D. Lacefield, Christi L. Forsythe
Kentucky Grazing Conference
No abstract provided.
Concurrent Panel Session 1: Environmental Sustainability And Las Vegas, Dale A. Devitt, David E. James, Patricia Mulroy, Alan O'Neill, Thomas C. Piechota, Doug Selby, Krystyna Anne Stave, Michael Yackira, Bruce Turner
Concurrent Panel Session 1: Environmental Sustainability And Las Vegas, Dale A. Devitt, David E. James, Patricia Mulroy, Alan O'Neill, Thomas C. Piechota, Doug Selby, Krystyna Anne Stave, Michael Yackira, Bruce Turner
Shaping the Future of Southern Nevada: Economic, Environmental, and Social Sustainability
Moderator: Dr. Stan Smith, UNLV School of Life Sciences Scribe: Crystal Jackson, UNLV Department of Sociology Conference white paper & Full summary of panel session, 6 pages
9th Annual Pacific Research Day Abstracts, University Of The Pacific
9th Annual Pacific Research Day Abstracts, University Of The Pacific
Excellence Day
No abstract provided.
Spectral Procedures Enhance The Analysis Of Three Agricultural Time Series, D. Meek, J. Prueger, M. Tomer, R. Malone
Spectral Procedures Enhance The Analysis Of Three Agricultural Time Series, D. Meek, J. Prueger, M. Tomer, R. Malone
Conference on Applied Statistics in Agriculture
Many agricultural and environmental variables are influenced by cyclic processes that occur naturally. Consequently their time series often have cyclic behavior. This study develops time series models for three different phenomena: (1) a 60 year-long state annual average crop yield record, (2) a four year-long daily stream flow record with values aggregated to weekly averages, and (3) a half-hour long wind speed record sampled at 10 hertz with values aggregated to 0.5 min averages. Trend tests, simple high pass filtering, and spectral analysis on original and detrended and residual data series are used to guide model development. Next, as a …
Sample Size Determination In Animal Health Studies, Zhanglin Cui, Alan G. Zimmermann, Daniel H. Mowrey
Sample Size Determination In Animal Health Studies, Zhanglin Cui, Alan G. Zimmermann, Daniel H. Mowrey
Conference on Applied Statistics in Agriculture
Oftentimes in animal health studies, a treatment group is randomly assigned to a pen of animals, and the pen of animals as a whole is treated (fed the same medicated feed or water) together. In this scenario, the pen of animals is the experimental unit and the individual animal may be an observational unit. In addition to having the pen as the experimental unit, if multiple sites are used and site is treated as a random factor, this adds complexity to the study. To properly design the study, it is necessary to determine the number of animals in a pen, …
Using A Nonlinear Crossed Random Effects Model With Three-Way Treatment Structure For Describing Circadian Patterns Of Serum Prolactin Concentrations In Heat Stressed Holsteins, M. Zhou, A. M. Parkhurst, B. C. Pollard, R. J. Collier
Using A Nonlinear Crossed Random Effects Model With Three-Way Treatment Structure For Describing Circadian Patterns Of Serum Prolactin Concentrations In Heat Stressed Holsteins, M. Zhou, A. M. Parkhurst, B. C. Pollard, R. J. Collier
Conference on Applied Statistics in Agriculture
A modified Gaussian model with three-level crossed and nested random effects is used to describe circadian patterns of serum prolactin concentrations in a crossover experiment. Testing of three-way treatment effects and carryover effects are incorporated with the model building process as is the within-group correlation. We found that the interaction between environment and parity had significant effect (p<0.05) on both initial serum prolactin concentration and range of the prolactin concentration. There was no significant effect of recombinant bovine somatotropin (rbST) on either the initial value or concentration of serum prolactin. The inclusion of carryover effects in the model significantly improves the fit of the multilevel nonlinear mixed effects model. We present in detail a general approach to nonlinear crossed random effects model building and three-way treatment effects testing.
Using Nonlinear Fixed And Mixed Models With Switching Functions To Allow For Hormesis In Growth Of Escherichia Coli, C. Tu, A. M. Parkhurst, L. M. Durso, R. W. Hutkins
Using Nonlinear Fixed And Mixed Models With Switching Functions To Allow For Hormesis In Growth Of Escherichia Coli, C. Tu, A. M. Parkhurst, L. M. Durso, R. W. Hutkins
Conference on Applied Statistics in Agriculture
Individual Escherichia coli (E. coli) strains can be characterized by measuring growth rate. Strains better adapted to the environment are expected to grow faster. Classic bacterial growth curves display an increase in optical density over time. In this paper, we use the logistic function to model growth in optical density of E. coli over time. We examine 16 curves for 8 E. coli strains originally isolated from cattle and found many curves have a paradoxical dip at the beginning that is indicative of hormesis (an initial contrarian response showing, stimulation or suppression of growth). We examine several switching functions that …
Tolerance Intervals For Gene Flow Rates From Transgenic To Non-Transgenic Wheat And Corn Using A Logistic Regression Model With Random Location Effects, Samuel Broderick, Phillip Chapman, Patrick Byrne, Todd Gaines
Tolerance Intervals For Gene Flow Rates From Transgenic To Non-Transgenic Wheat And Corn Using A Logistic Regression Model With Random Location Effects, Samuel Broderick, Phillip Chapman, Patrick Byrne, Todd Gaines
Conference on Applied Statistics in Agriculture
Crop scientists and government regulators are interested in mediating pollen flow from transgenic crops to other crops and weed species. To this end, a multi-year, multilocation series of experiments was conducted in eastern Colorado by the Department of Soil and Crop Sciences at Colorado State University. These experiments were done to estimate the distance required between plots of transgenic corn and wheat and plots of the respective non-transgenic crop to obtain at most a regulated limit of cross-pollination. The experiments involved planting a rectangle of transgenic crop in the middle of a non-transgenic field and measuring the proportion of cross-pollinated …
Adjusting Population Estimates For Genotyping Error In Non-Invasive Dna-Based Mark-Recapture Experiments, Shannon M. Knapp, Bruce A. Craig
Adjusting Population Estimates For Genotyping Error In Non-Invasive Dna-Based Mark-Recapture Experiments, Shannon M. Knapp, Bruce A. Craig
Conference on Applied Statistics in Agriculture
DNA from non-invasive sources is increasingly being used as molecular tags for markrecapture population estimation. These sources, however, provide small quantities of often contaminated DNA, which can lead to genotyping errors that will bias the population estimate. We describe a novel approach, called Genotyping Uncertainty Added Variance Adjustment (GUAVA), to address this problem. GUAVA incorporates an explicit model of genotyping error to generate a distribution of complete-information capture histories that is used to estimate the population size. This approach both reduces the genotyping-error bias and incorporates the additional uncertainty due to genotyping error into the variance of the estimate. We …
Selection Of Blocked Two-Level Fractional Factorial Designs For Agricultural Experiments, Weiming Ke, Cuirong Ren, Huitian Lu
Selection Of Blocked Two-Level Fractional Factorial Designs For Agricultural Experiments, Weiming Ke, Cuirong Ren, Huitian Lu
Conference on Applied Statistics in Agriculture
Blocked two-level fractional factorial designs are a very useful tool for efficient data collection in agricultural and other scientific research. In most experiments, in addition to the main effects, some two-factor interactions are also meaningful and need to be estimated. We propose a method for efficiently selecting blocked two-level fractional factorial designs when some of the two-factor interactions are non-negligible. We then present some results for a design with only 8 or 16 runs to illustrate how to use this method.
Specifications Of A Prototype Software System For Developing Variable-Rate Treatment Prescriptions For Use In Precision Agriculture, Kevin S. Mccarter, Eugene Burris, George A. Milliken, Ernest L. Clawson, Hoi Yee Wong, Jeffrey L. Willers
Specifications Of A Prototype Software System For Developing Variable-Rate Treatment Prescriptions For Use In Precision Agriculture, Kevin S. Mccarter, Eugene Burris, George A. Milliken, Ernest L. Clawson, Hoi Yee Wong, Jeffrey L. Willers
Conference on Applied Statistics in Agriculture
This paper discusses the process of developing variable-rate treatment prescriptions and gives specifications for a prototype software system for implementing that process. The process is based on statistical analysis of data from embedded field trials, and incorporates producer preferences in determining a treatment prescription. The system can be used by researchers in agricultural research stations for developing prescriptions for commercial agricultural producers. The specifications provided are general enough to be implemented using a variety of statistical and database packages that are available to researchers. In addition to these specifications we provide online access to source code for implementing the system …
Using The Cumulative-Size Mechanistic Model For Analyzing Insect Data, T. I. Matis, J. H. Matis, G .J. Michels Jr., M. N. Parajulee
Using The Cumulative-Size Mechanistic Model For Analyzing Insect Data, T. I. Matis, J. H. Matis, G .J. Michels Jr., M. N. Parajulee
Conference on Applied Statistics in Agriculture
Two data sets of aphid abundance are analyzed using a new cumulative-size based mechanistic model. The first data set pertains to the cotton aphid, and its analysis demonstrates the power of the mechanistic model-based approach. The second data set pertains to greenbug populations, and its analysis shows the key role that birth and death rate coefficients may play in predicting the peak and the cumulative population sizes.
Alternative Estimation Techniques For Assessing Probability Of Frost Damage In Subalpine Fir Trees, William J. Price, Bahman Shafii, Danny L. Barney
Alternative Estimation Techniques For Assessing Probability Of Frost Damage In Subalpine Fir Trees, William J. Price, Bahman Shafii, Danny L. Barney
Conference on Applied Statistics in Agriculture
Subalpine fir (Abies lasiocarpa var. lasiocarpa) is commonly used for nursery stock and Christmas tree applications. Spring frost damage to new buds, however, can jeopardize the longterm investment of growers and reduce the quality of the resulting fir trees. Hence, it is important to evaluate the risk of frost damage when considering prospective growing sites. A prediction model for bud development based on heat units can be used in conjunction with historical climate data to assess the likelihood of frost damage. That is, given the probability of a frost event at a given location and time, and the corresponding probability …
Tridimensional Regression, Kendra Schmid, David Marx, Ashok Samal
Tridimensional Regression, Kendra Schmid, David Marx, Ashok Samal
Conference on Applied Statistics in Agriculture
Shape analysis is useful for a wide variety of disciplines and has many applications. There are many different approaches to shape analysis, one of which focuses on the analysis of shapes that are represented by the coordinates of predefined landmarks on the object. This paper introduces Tridimensional Regression, a technique that can be used for mapping images and shapes that are represented by sets of three-dimensional landmark coordinates. The degree of similarity between shapes can be quantified using the tridimensional coefficient of determination (R2). An experiment was conducted to evaluate the effectiveness of this technique to correctly match …
Editor's Preface And Table Of Contents, John E. Boyer Jr.
Editor's Preface And Table Of Contents, John E. Boyer Jr.
Conference on Applied Statistics in Agriculture
These proceedings contain papers presented in the nineteenth annual Kansas State University Conference on Applied Statistics in Agriculture, held in Manhattan, Kansas, April 27-May 1, 2007.
Suburban Coyote Management And Research Needs: A Northeast Perspective, Paul D. Curtis, Daniel A. Bogan, Gordon Batcheller
Suburban Coyote Management And Research Needs: A Northeast Perspective, Paul D. Curtis, Daniel A. Bogan, Gordon Batcheller
Wildlife Damage Management Conference
Several factors may be responsible for increasing predator abundance in suburbia. These include an enhanced forage base associated with residential sprawl, and protection of predator species that were once persecuted and suppressed by hunters, trappers, and landowners. In the Northeast, anecdotal reports of coyotes (Canis latrans) killing pets in backyards are on the rise. The bulk of coyote complaints, concerns, and questions received from the public by state wildlife agencies are from areas with high human populations. Scant research exists on coyote behavioral ecology in human-altered landscapes. Biologists and managers need to understand changes in the social structure …
Missouri's Feral Hog Task Force: Addressing Increasing Feral Swine Populations, R. Edwin Hartin, Thomas A. Hutton
Missouri's Feral Hog Task Force: Addressing Increasing Feral Swine Populations, R. Edwin Hartin, Thomas A. Hutton
Wildlife Damage Management Conference
Feral hog (Sus scrofa) populations are expanding in size and distribution in Missouri and other parts of the United States. Increases of this invasive species are a serious concern because of the damage they cause and diseases they carry. Affected stakeholders in Missouri formed a task force in 1998 with sixteen member agencies and organizations to develop a program for the control/eradication of feral hogs in the state. The task force identified three objectives with appropriate supporting strategies to help achieve the ultimate goal: protection of Missouri 's public health, agricultural economy, and natural resources through eradication of …
Assessing Rodenticide Hazards: Improving The Art And Science Of Risk Assessment, John J. Johnston
Assessing Rodenticide Hazards: Improving The Art And Science Of Risk Assessment, John J. Johnston
Wildlife Damage Management Conference
Non-target hazards represent the most significant hurdle to the continued and possibly expanded use of anticoagulant rodenticides. In addition to the possibility of non-target access to the rodenticide bait, non-target scavenger and/or predator species may be exposed to these rodenticides via feeding on the carcasses of poisoned target species. Risk assessments provide a means to estimate the probability of rodenticide associated effects to target and non-target species. Quantification of risk provides critical information for decision-makers to weigh the benefits versus the risks of proposed rodenticide uses. This manuscript reports on the development of a probabilistic risk assessment model for quantifying …
A History Of Urban Coyote Problems, Robert M. Timm, Rex O. Baker
A History Of Urban Coyote Problems, Robert M. Timm, Rex O. Baker
Wildlife Damage Management Conference
We summarize previously published information on coyote attacks on humans in North America. This problem has developed primarily in urban and suburban areas of southern California since the early 1970s, and the frequency of attacks and other human safety incidents is increasing. Similar attacks are now known from at least 18 states in addition to California and from 4 Canadian provinces, with the majority of attacks occurring since the early 1990s. We review early explorers' and settlers' accounts of coyotes in the Los Angeles area, as well as development of coyote control programs during the 20th century. We also describe …
Human-Wildlife Conflict: A Case For Global Collaboration, Francine Madden
Human-Wildlife Conflict: A Case For Global Collaboration, Francine Madden
Wildlife Damage Management Conference
Human-wildlife conflict (HWC) hinders conservation globally and will continue to become more widespread as human population and development increase. Conservation and development efforts often lack knowledge, tools, and resources needed to address the complexities of HWC, especially when working in isolation from one another. Practitioners in all sectors would benefit from opportunities to exchange ideas and information across project sites and with other organizations, in order to learn about and develop best practices in preventing and mitigating HWC. The Human-Wildlife Conflict Collaboration (HWCC) aims to prevent and mitigate human-wildlife conflict (HWC) through a global network and partnership of diverse stakeholders …
Conserving Cheetahs On Private Land: Using The Namibian Cheetah Acinonyx Jubatus Jubatus As A Case Study, Laurie L. Marker, Amy Dickman
Conserving Cheetahs On Private Land: Using The Namibian Cheetah Acinonyx Jubatus Jubatus As A Case Study, Laurie L. Marker, Amy Dickman
Wildlife Damage Management Conference
Conflict between humans and large carnivores is well documented in Africa, and is one of the chief causes of population declines seen in species such as lions (Panthera lea), cheetahs (Acinonyx jubatus), and African wild dogs (Lycaon pictus). While protected areas provide important refuges for many carnivores, species such as cheetahs cover large areas where protected areas are insufficient to maintain long-term viable populations across much of their range. Over the past century, the world's cheetah population has declined in both numbers and range due to habitat fragmentation, depletion of their natural prey base …
Gray Wolves And Livestock In Montana: A Recent History Of Damage Management, Carolyn A. Sime, Ed Bangs, Elizabeth Bradley, John E. Steuber, Kraig Glazier, Paul J. Hoover, Val Asher, Kent Laudon, Mike Ross, Jon Trapp
Gray Wolves And Livestock In Montana: A Recent History Of Damage Management, Carolyn A. Sime, Ed Bangs, Elizabeth Bradley, John E. Steuber, Kraig Glazier, Paul J. Hoover, Val Asher, Kent Laudon, Mike Ross, Jon Trapp
Wildlife Damage Management Conference
The Montana gray wolf (Canis lupus) population grew from 2 wolves in 1979 to a minimum of 316 by late 2006. Resolving conflicts, both perceived and real, between wolves and livestock became a dominant social issue for the federal recovery program, and it remains so today. The United States Fish and Wildlife Service and now Montana Fish, Wildlife & Parks work with United States Department of Agriculture, Animal Plant Health Inspection Service, Wildlife Services to reduce depredation risks and address wolf-related conflicts through a combination of non-lethal and lethal management tools. The number of wolf complaints investigated from …