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- 2012 is known as Cattlemen's Day (27)
- 2012; Kansas Agricultural Experiment Station contribution; no. 12-231-S; Report of progress (Kansas State University. Agricultural Experiment Station and Cooperative Extension Service); 1065; Beef Cattle Research (27)
- Cattlemen's Day (27)
- Dairy Day (5)
- 2012 (1)
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- 2012; Beef; Bedding material; Insulation; Heat stress (1)
- 2012; Beef; Bolus; Trace minerals; Performance (1)
- 2012; Beef; Corn steep liquor; Intake; Digestion; Sericea lespedeza (1)
- 2012; Beef; Corn steep liquor; Tallgrass prairie hay; Sericea lespedeza; Intake (1)
- 2012; Beef; Crude glycerin; E. coli O157:H7 (1)
- 2012; Beef; Dehorning; Performance; Feedlot (1)
- 2012; Beef; E. coli O157:H7; Coliform concentrations; Feedlot (1)
- 2012; Beef; E. coli O157:H7; Commerical feedlot; SRP Vaccine (1)
- 2012; Beef; E.coli; Feeder cattle; Performance; Health; Carcass characteristics (1)
- 2012; Beef; Feedlot heifers; Lactipro; Performance; Megasphaera elsdenii (1)
- 2012; Beef; Feedlot; Daily gain; Carcass traits; Angus steers (1)
- 2012; Beef; Implant; Health performance; Feedlot performance; Bovine respiratory disease (1)
- 2012; Beef; Ivermectin Pour-on; Feedlot; Anthelmintics (1)
- 2012; Beef; LED light; Shelf life; Fluorescent lighting; Temperature (1)
- 2012; Beef; Lameness; Feedlot; Performance (1)
- 2012; Beef; Linpro; Copper; Feedlot cattle performance; Carcass characteristics; Fatty acid (1)
- 2012; Beef; MGA; Heifers; Oocyte quality; In vitro embryo (1)
- 2012; Beef; Microbials; ProTernative stress formula; Growth; Feed intake; Health (1)
- 2012; Beef; Native tallgrass pastures; Lactating beef cows; Non-lactating beef cows (1)
- 2012; Beef; Necropsy; Feedlot; Feedlot diseases (1)
- 2012; Beef; ProTernative stress formula; Growth performance; Health performance; Microbials (1)
- 2012; Beef; Prostaglandin F2α; Timed A.I.; CO-Synch + CIDR (1)
- 2012; Beef; Protein; Calf performance; Breeding; Intake; Digestion (1)
- 2012; Beef; Quality grade; Temperature; Longissimus lumborum; Tenderness (1)
- 2012; Beef; Steam-generation cooking vs. dry heat convection; Roasts; Connective tissue (1)
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Variation Analysis For Fiber Quality Traits Among Different Positionsin Eight Upland Cotton Cultivars, Yi Xu, Johnie N. Jenkins, Jack C. Mccarty, Jixiang Wu
Variation Analysis For Fiber Quality Traits Among Different Positionsin Eight Upland Cotton Cultivars, Yi Xu, Johnie N. Jenkins, Jack C. Mccarty, Jixiang Wu
Conference on Applied Statistics in Agriculture
Equivalencyof fiber quality within a plant of upland cotton, Gossypium hirsutum L., is very important. There are several traits within a plant that can be used to measure fiber quality and five of those traits will be investigated. Eight representative upland cultivars were grown at the Plant Science Research Farm at Mississippi State University in 1986 and five fiber traits: micronaire, fiber elongation, 2.5% and 50% span length, and fiber strength, were measured at different plant locations. The analysis of the study was modeled after a crop stability analysis with plant locations being treated as environments in the analysis. Three …
Towards Better Fdr Procedures For Discrete Test Statistics, Xiongzhi Chen, R. W. Doerge
Towards Better Fdr Procedures For Discrete Test Statistics, Xiongzhi Chen, R. W. Doerge
Conference on Applied Statistics in Agriculture
The false discovery rate (FDR) has been a widely used error measure in situations where a large number of tests are conducted simultaneously. Most methods that control the FDR at a prespeci ed level, or estimate the FDR of a multiple testing procedure (FDR procedures), were essentially developed for continuous test statistics. As such, their performances need to be carefully assessed when applied to discrete test statistics. We review some popular FDR procedures, point out a key reason for their excessive conservativeness when applied to discrete p-values, and suggest an improvement for these methods for such p-values.
Statistical Considerations When Using Hysteresis To Estimate Internal Heat Load In Dairy Cows, S. Maynes, A. M. Parkhurst
Statistical Considerations When Using Hysteresis To Estimate Internal Heat Load In Dairy Cows, S. Maynes, A. M. Parkhurst
Conference on Applied Statistics in Agriculture
Water is often used to manage heat stress in dairy cattle. Sprinklers are often placed over the feed bunk or used while cattle are waiting to be milked, however in this experiment cattle were given control over water with a cow-activated shower. Previous studies have focused on how wetting can lower body emperature or reduce respiration rates. An alternative way to investigate this management practice is to examine internal heat loads. Internal heat load can be quantified by fitting a hysteresis loop to daily field data. The hysteresis loop is formed by a phase diagram of body temperature versus an …
The Nuances Of Statistically Analyzing Next-Generation Sequencing Data, Sanvesh Srivastava, R. W. Doerge
The Nuances Of Statistically Analyzing Next-Generation Sequencing Data, Sanvesh Srivastava, R. W. Doerge
Conference on Applied Statistics in Agriculture
High-throughput sequencing technologies, in particular next-generation sequencing (NGS) technologies, have emerged as the preferred approach for exploring both gene function and pathway organization. Data from NGS technologies pose new computational and statistical challenges because of their massive size, limited replicate information, large number of genes (high-dimensionality), and discrete form. They are more complex than data from previous high-throughput technologies such as microarrays. In this work we focus on the statistical issues in analyzing and modeling NGS data for selecting genes suitable for further exploration and present a brief review of the relevant statistical methods. We discuss visualization methods to assess …
Treatment Heterogeneity And Potential Outcomes In Linear Mixed Effects Models, Troy E. Richardson, Gary L. Gadbury
Treatment Heterogeneity And Potential Outcomes In Linear Mixed Effects Models, Troy E. Richardson, Gary L. Gadbury
Conference on Applied Statistics in Agriculture
Studies commonly focus on estimating a mean treatment effect in a population. However, in some applications the variability of treatment effects across individual units may help to characterize the overall effect of a treatment across the population. Consider a set of treatments, {T,C}, where T denotes some treatment that might be applied to an experimental unit and C denotes a control. For each of N experimental units, the duplet {rTᵢ,rCᵢ}, i = 1,2, … , N, represents the potential response of the i th experimental unit if treatment were applied and the response …
Identifying Spectra Important For Prediction Of Senescent Grassland Canopy Structure, Rebecca Phillips, Nicanor Saliendra, Mark West
Identifying Spectra Important For Prediction Of Senescent Grassland Canopy Structure, Rebecca Phillips, Nicanor Saliendra, Mark West
Conference on Applied Statistics in Agriculture
Managers of the nearly 0.5 million ha of public lands in North and South Dakota, USA rely heavily on manual measurements of vegetation properties to ensure conservation of grassland structure for wildlife and forage for livestock. Spectral imaging data may be useful in assessment of large (>100,000 ha) landscapes, as in the Grand River National Grassland (GRNG), South Dakota. Here, we examined the predictive potential for the Advanced High Resolution Spectrometer (AVIRIS) to estimate mixed-grass prairie canopy structural attributes (photosynthetically active vegetation (kg PV ha-1), non-photosynthetically active vegetation (kg NPV ha-1), total standing crop (kg …
Exploration Of Reactant-Product Lipid Pairs In Mutant-Wild Type Lipidomics Experiments, Lianqing Zheng, Gary L. Gadbury, Jyoti Shah, Ruth Welti
Exploration Of Reactant-Product Lipid Pairs In Mutant-Wild Type Lipidomics Experiments, Lianqing Zheng, Gary L. Gadbury, Jyoti Shah, Ruth Welti
Conference on Applied Statistics in Agriculture
High-throughput metabolite analysis is very important for biologists to identify the functions of genes. A mutation in a gene encoding an enzyme is expected to alter the level of the metabolites which serve as the enzyme’s reactant(s) (also known as substrate) and product(s). To find the function of a mutated gene, metabolite data from a wild-type organism and a mutant are compared and candidate reactants and products are identified. The screening principle is that the concentration of reactants will be higher and the concentration of products will be lower in the mutant than in wild type. This is because the …
Variance Inflation Factors In Regression Models With Dummy Variables, Leigh Murray, Hien Nguyen, Yu-Feng Lee, Marta D. Remmenga, David W. Smith
Variance Inflation Factors In Regression Models With Dummy Variables, Leigh Murray, Hien Nguyen, Yu-Feng Lee, Marta D. Remmenga, David W. Smith
Conference on Applied Statistics in Agriculture
Variance Inflation Factors (VIFs) are used to detect collinearity among predictors in regression models. Textbook explanation of collinearity and diagnostics such as VIFs have focused on numeric predictors as being "co-linear" or "co-planar", with little attention paid to VIFs when a dummy variable is included in the model. This work was motivated by two regression models with high VIFs, where "standard' interpretations of causes of collinearity made no sense. The first was an alfalfa-breeding model with two numeric predictors and two dummy variables. The second was an economic model with one numeric predictor, one dummy and the numeric x dummy …
Stability Analysis For Yield And Seed Quality Of Soybean [Glycine Max (L.) Merril] Across Different Environments In Eastern South Dakota, Kaushal Raj Chaudhary, Jixiang Wu
Stability Analysis For Yield And Seed Quality Of Soybean [Glycine Max (L.) Merril] Across Different Environments In Eastern South Dakota, Kaushal Raj Chaudhary, Jixiang Wu
Conference on Applied Statistics in Agriculture
Genotype-environment interaction has always been an important and challenging issue for plant breeders in developing desirable varieties. Determination of genotype and environment is common in breeding program as it helps to find out the genotypes that have wide or specific adaptability across various environmental conditions. In this study, fifteen varieties of soybean were evaluated for stability of grain yield (ton/ha), protein content (%), and oil content (%) at six different locations of Eastern South Dakota in 2011. Mixed linear model and Additive main effects and multiplicative interactions (AMMI) were applied to detect genotype-by-environment (G*E) interactions and stability of each variety …
Gene Set Testing To Characterize Multivariately Differentially Expressed Genes, John R. Stevens, S. Clay Isom
Gene Set Testing To Characterize Multivariately Differentially Expressed Genes, John R. Stevens, S. Clay Isom
Conference on Applied Statistics in Agriculture
In a gene expression experiment (using oligo array, RNA-Seq, or other platform), researchers typically seek to characterize di erentially expressed genes based on common gene function or pathway involve-ment. The eld of gene set testing provides numerous characterization methods, some of which have proven to be more valid and powerful than others. These existing gene set testing methods focus on experimental designs where there is a single null hypothesis (usually involving association with a continuous or categorical phenotype) for each gene. Increasingly common experimental designs lead to multiple null hypotheses for each gene, and the characterization of these multivariately di …
Determining The Effectivesness Of Including Spatial Information Into A Nematode/Nutsedge Pest Complex Model, Joel Vetter, Zhining Ou, Leigh Murray, Stephen H. Thomas, Jill Schroeder
Determining The Effectivesness Of Including Spatial Information Into A Nematode/Nutsedge Pest Complex Model, Joel Vetter, Zhining Ou, Leigh Murray, Stephen H. Thomas, Jill Schroeder
Conference on Applied Statistics in Agriculture
An experiment was performed in 2005-2006 to determine if a nematode-resistant variety of alfalfa (Medicago sativa L.) can effectively reduce the pest complex consisting of yellow and purple nutsedge (YNS, Cyperus esculentus L. and PNS, C. rotundus L.) and the southern rootknot nematode (SRKN, Meloidogyne incognita (Kofoid & White) Chitwood). The alfalfa field, which had a history of severe infestation from both species of nutsedge and SRKN, was divided into 1m x 2m quadrats. In May, July and September of each year, eighty quadrats were randomly selected and counts of PNS, YNS and a soil sample (analyzed for the count …
Statistical Tests For Stability Analysis With Resampling Techniques, Jixiang Wu, Karl Glover, William Berzonsky
Statistical Tests For Stability Analysis With Resampling Techniques, Jixiang Wu, Karl Glover, William Berzonsky
Conference on Applied Statistics in Agriculture
Crop trials or crop performance trials (CPT), which are among the most important activities associated with plant breeding programs, are commonly used to measure the performance stability of genotypes. Several methods which include variation, regression, and cluster analyses for determination of crop stability have been proposed and are commonly used. However, many of these approaches require the use of normally distributed data. Thus, commonly used statistical tests, like the t- or F-test may not be appropriate when the assumptions of data are violated. In this study, two resampling techniques (jackknife and bootstrapping) were integrated into several crop stability analyses. An …
Bayesian Mcmc Analyses For Regulatory Assessments Of Food Composition, Jay M. Harrison, Derek Culp, George G. Harrigan
Bayesian Mcmc Analyses For Regulatory Assessments Of Food Composition, Jay M. Harrison, Derek Culp, George G. Harrigan
Conference on Applied Statistics in Agriculture
In order to gain regulatory approval to market a new seed product derived with biotechnology, grain and forage composition data must be collected from field trials, and summaries must be reported to various government agencies. Currently, both tests of differences in composition between a genetically modified organism (GMO) and its control and tests of equivalence of the GMO to conventional genotypes are required by regulatory agencies. Bayesian analyses offer an attractive option for regulatory assessments by expressing results that can be interpreted more easily by a wide audience and by providing more ways to examine various hypotheses of interest. In …
A Comparison Of Analytic And Bayesian Approaches For Characterizing Thermal Hysteresis In Cattle Using Algebraic And Geometric Distances, F. Yang, A. M. Parkhurst, S. Zhang, C. N. Lee, T. M. Brown-Brandl, K. G. Gebremedhin, P. E. Hillman
A Comparison Of Analytic And Bayesian Approaches For Characterizing Thermal Hysteresis In Cattle Using Algebraic And Geometric Distances, F. Yang, A. M. Parkhurst, S. Zhang, C. N. Lee, T. M. Brown-Brandl, K. G. Gebremedhin, P. E. Hillman
Conference on Applied Statistics in Agriculture
A high ambient temperature poses a serious threat to cattle. Above a certain threshold, an animal’s body temperature (Tb) appears to be driven by the hot cyclic air temperature (Ta) and hysteresis occurs. Elliptical hysteresis describes the output of a process in response to a simple harmonic input, and the trajectory forms a closed loop. The hysteresis loop shows a rotated elliptical pattern which depends on the lag between Tb and Ta. The objectives of this study are 1) to characterize hysteresis using bootstrapped ellipse specific nonlinear least squares 2) to reformulate models using the Bayesian method, and 3) to …
Armedand Dangerous: The Consequences Of Not Randomizing The First Block, Edzard Van Santen, Mark West
Armedand Dangerous: The Consequences Of Not Randomizing The First Block, Edzard Van Santen, Mark West
Conference on Applied Statistics in Agriculture
Replication and randomization and are the keys for statistically valid experiments. Both are necessary components for statistically valid experimentation. Yet it is an industry wide practicein weed science research to assign treatment in the first block of a randomized complete block design in a systematic order for reasons of convenience. We investigated this practice by comparing four randomization/analysis scenarios: (i) complete randomization in all blocks, (ii) systematic assignment of treatmentsin block 1, where the best treatment was assigned to the best plot, (iii) systematic assignment of treatmentsin block 1, where the best treatment was assigned to the worst plot,and (iv) …
Correcting For Amplification Bias In Next-Generation Sequencing Data, Douglas Baumann, R. W. Doerge
Correcting For Amplification Bias In Next-Generation Sequencing Data, Douglas Baumann, R. W. Doerge
Conference on Applied Statistics in Agriculture
Next-generation sequencing (NGS) technologies have opened the door to a wealth of knowledge and information about biological systems, particularly in genomics and epigenomics. These tools, although useful, carry with them additional technological and statistical challenges that need to be understood and addressed. One such issue is ampli cation bias. Specifically, the majority of NGS technologies effectively sample small amounts of DNA or RNA that are amplified (i.e., copied) prior to sequencing. The amplification process is not perfect, and thus sequenced read counts can be extremely biased. Unfortunately, current amplification bias controlling procedures introduce a dependence of gene expression on gene …
Multivariate Statistical Analysis Of Avian Index Of Biotic Integrity, Bahman Shafii, William J. Price, Norm Merz, Dwight Bergeron
Multivariate Statistical Analysis Of Avian Index Of Biotic Integrity, Bahman Shafii, William J. Price, Norm Merz, Dwight Bergeron
Conference on Applied Statistics in Agriculture
The Index of Biotic Integrity (IBI) is a multi-metric index designed to measure the changes in ecological and environmental conditions as affected by human disturbances. Hence, IBI is used in practice to detect divergence from biological integrity attributable to human actions. The incorporation of biological attributes is often done at both the individual and higher level assemblages. The objective of this paper is to demonstrate the construction and statistical evaluation of a multi-metric Avian Index of Biotic Integrity (A-IBI). Canonical correlation analyses are utilized to select pertinent avian metrics as impacted by vegetation and hydrology variables. The resulting avian metrics …
Evaluation Of Genotype By Environment Interactions From Unreplicated Multi-Environmental Trials Of Hybrid Maize, Ani A. Elias, Kelly R. Robbins, Dev Niyogi, James J. Camberato, R. W. Doerge, Mitchell R. Tuinstra
Evaluation Of Genotype By Environment Interactions From Unreplicated Multi-Environmental Trials Of Hybrid Maize, Ani A. Elias, Kelly R. Robbins, Dev Niyogi, James J. Camberato, R. W. Doerge, Mitchell R. Tuinstra
Conference on Applied Statistics in Agriculture
Diverse soils and varying weather conditions not only affect overall performance of hybrid maize in multi-environment field studies, but can also cause strong genotype by environment interactions (GEI). Modern maize breeding experiments utilize multilocation trials with augmented field designs to evaluate the performance of unreplicated test hybrids. Augmented designs are resource efficient; however, these designs do not efficiently quantify or test GEI variation in the test hybrids. New methods are being developed that use random regression models to incorporate multiple environmental effects into GEI models to increase their accuracy and predictive ability. Incorporation of varying weather and soil physical variables …
Editor's Preface And Table Of Contents, Weixing Song
Editor's Preface And Table Of Contents, Weixing Song
Conference on Applied Statistics in Agriculture
These proceedings contain papers presented in the twenty-fourth annual Kansas State University Conference on Applied Statistics in Agriculture, held in Manhattan, Kansas, April 29 - May 1, 2012.
Kansas Fertilizer Research 2011, Dorivar Ruiz Diaz
Kansas Fertilizer Research 2011, Dorivar Ruiz Diaz
Kansas Agricultural Experiment Station Research Reports
No abstract provided.
Field Research 2012, Kansas State University. Agricultural Experiment Station And Cooperative Extension Service
Field Research 2012, Kansas State University. Agricultural Experiment Station And Cooperative Extension Service
Kansas Agricultural Experiment Station Research Reports
Includes research reports from these locations: East Central Kansas Experiment Field, Kansas River Valley Experiment Field, and Western Kansas Agricultural Research Centers.
Bedding Material In Dirt-Floor Pens Reduces Heat (2012), D.J. Rezac, Daniel U. Thomson, Christopher D. Reinhardt
Bedding Material In Dirt-Floor Pens Reduces Heat (2012), D.J. Rezac, Daniel U. Thomson, Christopher D. Reinhardt
Kansas Agricultural Experiment Station Research Reports
Weather-related stressors are a well-recognized opponent to animal welfare and can have important ramifications for animal performance. Sound animal husbandry practices historically have attempted to diminish the effects of deleterious environmental factors. Providing aid to animals when temperatures are above or below their thermal neutral zone (TNZ) can improve animal welfare and/or performance. Because most breeds of cattle are not well equipped to deal with heat, the temperatures at which heat stress can begin to affect cattle can be surprisingly low. The onset of mild heat stress can occur at a temperature humidity index (THI1) value of 75, which can …
Comparative Efficacy Of Two Ivermectin Pour-On Anthelmintics In Beef Steers In A Commercial Feedyard (2012), A.J. Tarpoff, T. Guichon, Daniel U. Thomson, Benjamin W. Wileman, Christopher D. Reinhardt
Comparative Efficacy Of Two Ivermectin Pour-On Anthelmintics In Beef Steers In A Commercial Feedyard (2012), A.J. Tarpoff, T. Guichon, Daniel U. Thomson, Benjamin W. Wileman, Christopher D. Reinhardt
Kansas Agricultural Experiment Station Research Reports
Generic products generally have a cost advantage for beef producers over brand-name products. Recently, many beef producers have debated whether to utilize generic anthelmintics in cow/calf herds and feeder cattle. If generics are to be justified, the products must be proven to have efficacy similar to the brand-name product. Previous studies have indicated that generic macrocyclic lactones are less effective in controlling gastrointestinal parasites of cattle than the original brand-name products. The objective of this study was to compare the efficacy of Vetrimec (Norbrook Laboratories Limited, Newry, Co. Down, Northern Ireland) pour-on and Ivomec (Merial Animal Health, Duluth, GA) pour-on …
Time Of Onset, Location, And Duration Of Lameness In Beef Cattle In A Commercial Feedyard (2012), T.M. Green, P.T. Guichon, Daniel U. Thomson, Benjamin W. Wileman, Christopher D. Reinhardt
Time Of Onset, Location, And Duration Of Lameness In Beef Cattle In A Commercial Feedyard (2012), T.M. Green, P.T. Guichon, Daniel U. Thomson, Benjamin W. Wileman, Christopher D. Reinhardt
Kansas Agricultural Experiment Station Research Reports
Bovine lameness presents itself in a variety of forms. A number of predisposing factors have been reported, such as increased amounts of wet feces and mud from high rainfall; limb trauma from rocks, sticks, or handling facilities; inappropriate animal handling; or improper facility design. Trauma causes lameness directly and often provides an avenue for bacterial agents to enter and colonize a wound. Performance of lame cattle is diminished due to impaired ambulation, resulting in decreased feed intake and decreased body weight. The objective of this study was to determine the timing of the onset of lameness in feeder cattle and …
Delaying Implant In High-Risk Calves Has No Benefit For Health Or Feedlot Performance (2012), R.D. Munson, Daniel U. Thomson, Christopher D. Reinhardt
Delaying Implant In High-Risk Calves Has No Benefit For Health Or Feedlot Performance (2012), R.D. Munson, Daniel U. Thomson, Christopher D. Reinhardt
Kansas Agricultural Experiment Station Research Reports
Bovine respiratory disease is the most common and costly disease in the beef industry. Calves affected by bovine respiratory disease have a 53-lb decrease in finished weights and decreased quality grades compared with healthy cattle. Many stressors influence post-arrival health and nutrient intake, including weaning, marketing, transportation, co-mingling, genetics, previous nutrition, and health history. These stressors can negatively affect the immune system at a time when the animal is more likely to be exposed to infectious agents within the bovine respiratory disease complex. Feed intake by stressed calves is low, and low nutrient intake likely increases the negative effects of …
Direct-Fed Microbials For Receiving Cattle Ii: Effects Of Proternative Stress Formula Fed In A Dry Suspension On Growth, Feed Intake, And Health Of Receiving Beef Heifers (2012), A.V. Siverson, M.E. Corrigan, James J. Higgins, Dale A. Blasi, Brandon E. Oleen
Direct-Fed Microbials For Receiving Cattle Ii: Effects Of Proternative Stress Formula Fed In A Dry Suspension On Growth, Feed Intake, And Health Of Receiving Beef Heifers (2012), A.V. Siverson, M.E. Corrigan, James J. Higgins, Dale A. Blasi, Brandon E. Oleen
Kansas Agricultural Experiment Station Research Reports
Enhanced preconditioning and nutritional management strategies are needed industrywide as a means of controlling stress and related health problems for freshly arrived stocker calves. Direct-fed microbials are feed additives that stimulate natural, nonpathogenic gut flora in an attempt to stimulate competition against potentially pathogenic gut flora. Previous research involving direct-fed microbials offered in a liquid suspension to lightweight stocker calves produced no effects on growth or health performance. Therefore, the objective of our study was to evaluate the effects of a directfed microbial offered as a dry suspension on feed intake, average daily gain, and morbidity of highly stressed beef …
Mga And Growth Promotants Administered To Beef Feedlot Heifers Have No Effect On Subsequent Oocyte Quality Or In Vitro Embryo Production (2012), N. Miller, David M. Grieger, Karol E. Fike
Mga And Growth Promotants Administered To Beef Feedlot Heifers Have No Effect On Subsequent Oocyte Quality Or In Vitro Embryo Production (2012), N. Miller, David M. Grieger, Karol E. Fike
Kansas Agricultural Experiment Station Research Reports
Beef feedlot heifers have the potential to serve as viable donors of oocytes post-slaughter for in vitro embryo production. Oocyte quality is a critical factor affecting the success of in vitro embryo production and can be influenced by factors such as age and reproductive status, ovarian follicle size, and nutritional status of the donor female. In a conventional feedlot setting, heifers are typically administered steroid-based growth promotants and fed melengestrol acetate (MGA) for suppression of estrus, which increases circulating concentrations of reproductive steroids, particularly estradiol. The effects of these management practices on oocyte quality and numbers are unknown. The purpose …
Presynchronizing Prostaglandin F2Α Injection Before Timed Artificial Insemination Co-Synch + Cidr Program (2012), Scott L. Hill, Stephanie Leeann Pulley, H.I. Jr. Mellieon, K. C. Olson, John R. Jaeger, Ryan M. Breiner, G.A. Perry, G.C. Lamb, Jeffrey S. Stevenson
Presynchronizing Prostaglandin F2Α Injection Before Timed Artificial Insemination Co-Synch + Cidr Program (2012), Scott L. Hill, Stephanie Leeann Pulley, H.I. Jr. Mellieon, K. C. Olson, John R. Jaeger, Ryan M. Breiner, G.A. Perry, G.C. Lamb, Jeffrey S. Stevenson
Kansas Agricultural Experiment Station Research Reports
Fixed-time artificial insemination is an effective management tool that reduces the labor associated with more conventional programs that require detection of estrus. The 7-day CO-Synch + controlled internal drug release (CIDR) insert protocol has been shown to effectively initiate estrus and ovulation in cycling and non-cycling suckled beef cows, producing pregnancy rates at or greater than 50% in beef cows. The gonadotropin- releasing hormone (GnRH) injection that begins the CO-Synch + CIDR program initiates ovulation in a large proportion of cows, particularly anestrous cows. The CIDR, which releases progesterone intravaginally, prevents short estrous cycles that usually follow the first postpartum …
Increasing Protein Supply To Pregnant Beef Cows When Energy Is Limited Does Not Improve Cow Or Calf Performance (2012), E.A. Bailey, Evan C. Titgemeyer, R.C. Cochran, Timothy J. Jones, K. C. Olson
Increasing Protein Supply To Pregnant Beef Cows When Energy Is Limited Does Not Improve Cow Or Calf Performance (2012), E.A. Bailey, Evan C. Titgemeyer, R.C. Cochran, Timothy J. Jones, K. C. Olson
Kansas Agricultural Experiment Station Research Reports
Pre- and postpartum deficiencies of metabolizable protein have been identified as potentially limiting to productivity of beef cows and calves. Pre-partum supplementation of forage-based diets with ruminally undegraded protein has increased weight gain and breeding performance in prior studies, but the level of ruminally degraded protein fed was not known. Feeding adequate ruminally degraded protein to beef cows maximizes the productivity of microbes in the rumen, so any benefits shown in prior work could have been attributed to increased ruminal fermentation. Our objectives were (1) to determine the value of supplementing ruminally undegraded protein when dietary ruminally degraded protein supply …
Effects Of Corn Steep Liquor Supplementation On Voluntary Selection Of Tallgrass Prairie Hay Contaminated With Sericea Lespedeza And Uncontaminated Tallgrass Prairie Hay (2012), G.J. Eckerle, L.A. Pacheco, K. C. Olson, John R. Jaeger
Effects Of Corn Steep Liquor Supplementation On Voluntary Selection Of Tallgrass Prairie Hay Contaminated With Sericea Lespedeza And Uncontaminated Tallgrass Prairie Hay (2012), G.J. Eckerle, L.A. Pacheco, K. C. Olson, John R. Jaeger
Kansas Agricultural Experiment Station Research Reports
Sericea lespedeza (Lespedeza cuneata) is classified as a noxious weed throughout the Great Plains. It produces copious amounts of seed annually and contains high levels of condensed tannins during much of the growing season, which deters grazing by large domestic herbivores. In Kansas alone, this plant infests approximately 600,000 acres of native range, reducing native grass production by up to 92%. Increased grazing pressure on sericea lespedeza by beef cattle may slow its spread and facilitate some measure of biological control. Feedstuffs or feed additives with tannin-binding properties may promote voluntary consumption of this plant by grazing beef cattle. In …