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2013

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Articles 1 - 30 of 73

Full-Text Articles in Life Sciences

Using Functional Data Analysis To Evaluate Effect Of Shade On Body Temperature Of Feedlot Heifers During Environmental Heat Stress, F. Yang, A. M. Parkhurst, C. N. Lee, T. M. Brown-Brandl, P. E. Hillman Apr 2013

Using Functional Data Analysis To Evaluate Effect Of Shade On Body Temperature Of Feedlot Heifers During Environmental Heat Stress, F. Yang, A. M. Parkhurst, C. N. Lee, T. M. Brown-Brandl, P. E. Hillman

Conference on Applied Statistics in Agriculture

Heat stress can be a serious problem for cattle. Body temperature (Tb) is a good measure of an animal’s thermo-regulatory response to an environmental thermal challenge. Previous studies found that Tb increases in response to increasing ambient temperature in a controlled chamber. However, when animals are in an uncontrolled environment, Tb is subject to many uncontrolled environmental factors, such as sunshade, wind, and humidity, that increase variation in the data. Hence, functional data analysis (FDA) was applied to analyze the data with uncontrolled environmental factors as curves in the whole series of days in this study. Breed (Angus, MARCIII, MARC-I, …

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Detecting Factors Associated With Springwheat Yield Stability In South Dakota Environments, Jixiang Wu, Karl Glover, William Berzonsky Apr 2013

Detecting Factors Associated With Springwheat Yield Stability In South Dakota Environments, Jixiang Wu, Karl Glover, William Berzonsky

Conference on Applied Statistics in Agriculture

Conventional yield stability analyses are focused on yield stability itself by using single linear regression method and/or additive main effect and multiplicative interaction (AMMI) analysis. It is likely that yield stability for a genotype is associated with many factors such as fertilizer level, soil types, weather conditions, and/or yield components. Detection of factors highly associated with yield stability, therefore, will help breeders develop cultivars adapted to diverse environments or to specific environments. In this study, we conducted correlation analysis based on both environments and genotypes for a data set with 22 spring wheat genotypes, which were evaluated in 18 environments …

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Estimation Of Dose Requirements For Extreme Levels Of Efficacy, Mark West, Guy Hallman Apr 2013

Estimation Of Dose Requirements For Extreme Levels Of Efficacy, Mark West, Guy Hallman

Conference on Applied Statistics in Agriculture

The objective of this paper is to explore the extent of how dose-response models may be used to estimate extreme levels of efficacy for controlling insect pests and possibly other uses. Probit-9 mortality (99.9968% mortality) is a standard for treatment effectiveness in tephritid fruit fly research, and has been adopted by the United States Department of Agriculture for fruit flies and other pests. Data taken from the phytosanitary treatment (PT) literature are analyzed. These data are used to fit dose-response models with logit, probit and complimentary log-log links. The effectiveness of these models for predicting extreme levels of efficacy is …

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A Simulation Study Of The Small Sample Properties Of Likelihood Based Inference For The Beta Distribution, Kevin Thompson, Edward Gbur Apr 2013

A Simulation Study Of The Small Sample Properties Of Likelihood Based Inference For The Beta Distribution, Kevin Thompson, Edward Gbur

Conference on Applied Statistics in Agriculture

Researchers often collect proportion data that cannot be interpreted as arising from a set of Bernoulli trials. Analyses based on the beta distribution may be appropriate for such data. The SAS® GLIMMIX procedure provides a tool for these analyses using a likelihood based approach in the context of generalized linear mixed models. Since the t and F-distribution based inference employed in this approach relies on asymptotic properties, it is important to understand the sample sizes required to obtain reasonable approximate answers to inference questions. In addition, the complexity of the likelihood functions can lead to numerical issues for optimization algorithms …

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Non-Normal Data In Agricultural Experiments, W. W. Stroup Apr 2013

Non-Normal Data In Agricultural Experiments, W. W. Stroup

Conference on Applied Statistics in Agriculture

Advances in computers and modeling over the past couple of decades have greatly expanded options for analyzing non-normal data. Prior to the 1990’s, options were largely limited to analysis of variance (ANOVA), either on untransformed data or after applying a variance stabilizing transformation. With or without transformations, this approach depends heavily on the Central Limit Theorem and ANOVA’s robustness. The availability of software such as R’s lme4 package and SAS® PROC GLIMMIX changed the conversation with regard to non-normal data. With expanded options come dilemmas. We have software choices – R and SAS among many others. Models have conditional and …

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Multivariate Statistical Analysis Of Terrestrial Invertebrate Index Of Biotic Integrity, Bahman Shafii, William J. Price, Norm Merz, Timothy D. Hatten Apr 2013

Multivariate Statistical Analysis Of Terrestrial Invertebrate Index Of Biotic Integrity, Bahman Shafii, William J. Price, Norm Merz, Timothy D. Hatten

Conference on Applied Statistics in Agriculture

The Index of Biotic Integrity (IBI) is designed to measure the changes in ecological and environmental conditions as affected by human disturbances. In practice, the IBI is used in various ecological applications to detect divergence in biological integrity attributable to human actions. Last year during this conference, methodologies for developing an Avian Index of Biotic Integrity (A-IBI) were presented and discussed. The objective of this paper is to demonstrate the construction and statistical evaluation of a multi-metric terrestrial Invertebrate Index of Biotic Integrity (I-IBI) using the same multivariate statistical techniques. Canonical correlation analyses were utilized to select pertinent invertebrate metrics …

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Characterizing Benthic Macroinvertebrate Community Responses To Nutrient Addition Using Nmds And Baci Analyses, Bahman Shafii, William J. Price, G. Wayne Minshall, Charlie Holderman, Paul J. Anders, Gary Lester, Pat Barrett Apr 2013

Characterizing Benthic Macroinvertebrate Community Responses To Nutrient Addition Using Nmds And Baci Analyses, Bahman Shafii, William J. Price, G. Wayne Minshall, Charlie Holderman, Paul J. Anders, Gary Lester, Pat Barrett

Conference on Applied Statistics in Agriculture

Nonmetric multidimensional scaling (NMDS) is an ordination technique which is often used for information visualization and exploring similarities or dissimilarities in ecological data. In principle, NMDS maximizes rank-order correlation between distance measures and distance in the ordination space. Ordination points are adjusted in a manner that minimizes stress, where stress is defined as a measure of the discordance between the two kinds of distances. Before and After Control Impact (BACI) is a classical analysis of variance method for measuring the potential influence of an environmental disturbance. Such effects can be assessed by comparing conditions before and after a planned activity. …

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Thou Shall Not Brush Your Teeth While Eating Breakfast: A 7- Step Program For Researchers Previously Hurt In Data Analysis, Edzard Van Santen Apr 2013

Thou Shall Not Brush Your Teeth While Eating Breakfast: A 7- Step Program For Researchers Previously Hurt In Data Analysis, Edzard Van Santen

Conference on Applied Statistics in Agriculture

After years of providing statistical advice to fellow faculty members and graduate students, I have come to realize that it is not necessarily the big issues, but lack of knowledge of basic data analysis principles that get my clients into trouble. My claim is that if researchers and students internalized two basic definitions they would not have any problems analyzing most of their experiments. The definitions of Experimental Unit (EU) as the smallest physical unit to which a treatment may be applied and Experimental Error (Exp. Err.) as the variation among EUs treated alike are the basis for successful data …

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Comparing Functional Data Analysis And Hysteresis Loops When Testing Treatments For Reducing Heat Stress In Dairy Cows, S. Maynes, A. M. Parkhurst, J. B. Gaughan, T. L. Mader Apr 2013

Comparing Functional Data Analysis And Hysteresis Loops When Testing Treatments For Reducing Heat Stress In Dairy Cows, S. Maynes, A. M. Parkhurst, J. B. Gaughan, T. L. Mader

Conference on Applied Statistics in Agriculture

Various techniques are commonly used to reduce heat stress, including sprayers and misters, shading, and changes in feed. Oftentimes studies are performed where researchers do not control the times when animals use shading or other means available to reduce heat stress, making it hard to test differences between treatments. Two methods are used on data from a study where Holstein cows were given free access to weight activated “cow showers.” Functional data analysis can be used to model body temperature as a function of time and environmental variables such as the Heat Load Index. Differences between treatment groups can be …

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Five Things I Wish My Mother Had Told Me, About Statistics That Is, Philip M. Dixon Apr 2013

Five Things I Wish My Mother Had Told Me, About Statistics That Is, Philip M. Dixon

Conference on Applied Statistics in Agriculture

I present five short stories, each describing something I wish I had known and appreciated earlier in my statistical life. The five are Simpson's paradox is everywhere, numerical optimization algorithms can be deceived, you can't always trust the Satterthwaite approximation, BLUP's are wonderful things, and It's good to know Reverend Bayes.

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On The Small Sample Behavior Of Generalized Linear Mixed Models With Complex Experiments, Julie Couton, Walt Stroup Apr 2013

On The Small Sample Behavior Of Generalized Linear Mixed Models With Complex Experiments, Julie Couton, Walt Stroup

Conference on Applied Statistics in Agriculture

Generalized linear mixed models (GLMMs), regardless of the software used to implement them (R, SAS, etc.), can be formulated as conditional or marginal models and can be computed using pseudo-likelihood, penalized quasi-likelihood, or integral approximation methods. While information exists about the small sample behavior of GLMMs for some cases- notably RCBDs with Binomial or count data- little is known about GLMMs for continuous proportions (e.g. Beta) or time-to-event (e.g. Gamma) data or for more complex designs such as the split-plot. In this presentation we review the major model formulation and estimation options and compare their small sample performance for cases …

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Editor's Preface And Table Of Contents, Weixing Song Apr 2013

Editor's Preface And Table Of Contents, Weixing Song

Conference on Applied Statistics in Agriculture

These proceedings contain papers presented in the twenty-fifth annual Kansas State University Conference on Applied Statistics in Agriculture, held in Manhattan, Kansas, April 28 - April 30, 2013.

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Bri: The First Five Years, Biosecurity Research Institute Jan 2013

Bri: The First Five Years, Biosecurity Research Institute

Special Publications

This 2012 Annual Report highlights the history of the first five years of the Biosecurity Research Institute (BRI) at Kansas State University. Topics include the facility, its operations and safety, education and training, partners and funding, research highlights and leadership, since the Institute's founding in 2007.

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Ultrasound Technology Has Limited Ability To Predict Carcass Yield Grade Of Lightweight, Short-Fed Stocker Cattle (2013), S.J. Lawrence, S.E. Kreider, James J. Higgins, L. Allen, M.P. Epp, P. Ritter, Dale A. Blasi, Michael E. Dikeman Jan 2013

Ultrasound Technology Has Limited Ability To Predict Carcass Yield Grade Of Lightweight, Short-Fed Stocker Cattle (2013), S.J. Lawrence, S.E. Kreider, James J. Higgins, L. Allen, M.P. Epp, P. Ritter, Dale A. Blasi, Michael E. Dikeman

Kansas Agricultural Experiment Station Research Reports

The majority of cattle fed in commercial feedlots are processed and placed into pens without sorting into groups of uniform size and body condition. As a result of the variability in weight and condition, this management practice may lead to some cattle being fed beyond their optimal harvest point, whereas others are underconditioned and harvested prematurely, and thus fail to reach desired weight or quality grade necessary to attract available carcass premiums. Our objective was to determine if ultrasound technology could be utilized with lightweight calves as a means of predicting carcass fat thickness and yield grade outcomes. If successful, …

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Effects Of Chromium Propionate And Supplemental Amino Acids On Dairy Cattle Performance Near Peak Lactation (2013), Francisco J. Vargas, Kai Yuan, Evan C. Titgemeyer, Laman Mamedova Jan 2013

Effects Of Chromium Propionate And Supplemental Amino Acids On Dairy Cattle Performance Near Peak Lactation (2013), Francisco J. Vargas, Kai Yuan, Evan C. Titgemeyer, Laman Mamedova

Kansas Agricultural Experiment Station Research Reports

Feeding chromium in early lactation can increase milk production, but responses during peak lactation have not been studied. The objective of this study was to evaluate responses to chromium propionate during this period as well as interactions with rumen-protected lysine and methionine. Chromium propionate increased feed intake and tended to increase energy-corrected milk yield, and primiparous cows showed greater responses in feed intake and milk protein yield than multiparous cows. In this study, feeding chromium propionate near peak lactation increased feed intake and tended to increase productivity, but no benefits of supplementing rumen-protected lysine and methionine were observed.; Dairy Day, …

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Concentrations Of Luteinizing Hormone And Ovulatory Responses In Dairy Cows Before Timed Artificial Insemination (2013), Stephanie Leeann Pulley, D. H. Keisler, Scott L. Hill, Jeffrey S. Stevenson Jan 2013

Concentrations Of Luteinizing Hormone And Ovulatory Responses In Dairy Cows Before Timed Artificial Insemination (2013), Stephanie Leeann Pulley, D. H. Keisler, Scott L. Hill, Jeffrey S. Stevenson

Kansas Agricultural Experiment Station Research Reports

The objective of this study was to determine the incidence of spontaneous and gonadotropinreleasing hormone (GnRH)-induced surges of luteinizing hormone (LH) and ovulatory responses in lactating dairy cows enrolled in a timed artificial insemination (TAI) protocol. Cows (n = 70) in a single herd were assigned to one of two presynchronization protocols: Pre- 10 or PG-3-G. Cows assigned to the Pre-10 treatment received 2 injections of prostaglandin F2α(PGF2α) 14 days apart (Presynch), with the second injection administered 10 days before the onset of a TAI protocol. Cows assigned to the PG-3-G treatment received an injection of prostaglandin F2α(PGF2α), then 3 …

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Automated Activity Monitoring Of Estrus And Time Of Ovulation (2013), Jeffrey S. Stevenson Jan 2013

Automated Activity Monitoring Of Estrus And Time Of Ovulation (2013), Jeffrey S. Stevenson

Kansas Agricultural Experiment Station Research Reports

Detection of estrus can be facilitated by use of automated activity monitors that measure physical activity. Increased physical activity is largely correlated with estrus. Our objective was to determine when ovulation occurs relative to increased physical activity so we could recommend optimal timing of insemination to maximize conception rates in lactating dairy cows. Cows (n = 65) were fitted with pressure-sensitive rump-mounted transmitters (HeatWatch; HW) that are activated by a mounting herdmate to indicate standing estrus. The same cows also were fitted with neck-mounted activity monitors (Select Detect; SD). Additional cows (n = 68) were fitted with only the activity …

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Consumer Acceptance Of Cysteine-Enhanced Yogurt, Soumya Bala, Karen A. Schmidt Jan 2013

Consumer Acceptance Of Cysteine-Enhanced Yogurt, Soumya Bala, Karen A. Schmidt

Kansas Agricultural Experiment Station Research Reports

Within cells, cysteine can be synthesized from methionine by the enzyme γ-cystathionase. Cysteine is then utilized to synthesize glutathione, which has many functions in cells that contribute to good health. Certain subpopulations, however, especially the elderly, have decreased γ-cystathionase activity. Thus, dietary cysteine may be beneficial in maintaining health. In previous reports, a yogurt with enhanced cysteine content was made by incorporating whey protein isolate (WPI) into the mix's dairy base combined with a process treatment to minimize cysteine denaturation. The gel quality of this yogurt matched or exceeded that of a yogurt that was formulated and processed to mimic …

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Five-Day Resynch Programs In Dairy Cows Including Controlled Internal Drug Release At Two Stages Post-Artificial Insemination (2013), Stephanie Leeann Pulley, Scott L. Hill, Jeffrey S. Stevenson Jan 2013

Five-Day Resynch Programs In Dairy Cows Including Controlled Internal Drug Release At Two Stages Post-Artificial Insemination (2013), Stephanie Leeann Pulley, Scott L. Hill, Jeffrey S. Stevenson

Kansas Agricultural Experiment Station Research Reports

Two experiments were conducted to assess pregnancy outcomes after a 5-day Ovsynch-56 Resynch (RES; gonadotropin-releasing hormone injection 5 days before [GnRH-1; d 0] and 56 hours (GnRH-2) after PGF2α[PG] injections on day 5 and 6, timed artificial insemination [TAI] on day 8) with and without a progesterone-releasing intravaginal controlled internal drug release (CIDR) 5-day insert. In Exp. 1, nonpregnant cows were enrolled on day 34 post- AI: day 34 RES-CON (n = 528) or day 34 RES-CIDR (n = 503). Blood was collected for progesterone assay. Pregnancy per AI (P/AI) was diagnosed by uterine palpation per rectum at 34 and …

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K-State Turfgrass Research 2013, Kansas State University. Agricultural Experiment Station And Cooperative Extension Service Jan 2013

K-State Turfgrass Research 2013, Kansas State University. Agricultural Experiment Station And Cooperative Extension Service

Kansas Agricultural Experiment Station Research Reports

Turfgrass Research 2013 contains results of projects conducted by K-State faculty and graduate students. Some of these results will be presented at the Kansas Turfgrass Field Day, August 1, 2013, at the John C. Pair Horticulture Research Center in Haysville, Kan. Articles included in this Report of Progress present summaries of research projects that were completed recently or will be completed in the next year or two. Specifically, this year's report presents summaries of research on turf establishment and management, variety evaluations, pest management, and water issues and drought.

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Southwest Research-Extension Center, Field Day 2013 Jan 2013

Southwest Research-Extension Center, Field Day 2013

Kansas Agricultural Experiment Station Research Reports

Report of agricultural research from Southwest Research-Extension Center of Kansas State University.

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Calf Health And Performance During Receiving Is Not Changed By Fence-Line Preconditioning On Flint Hills Range Vs. Drylot Preconditioning (2013), E.A. Bailey, G.W. Preedy, L.A. Pacheco, John R. Jaeger, Justin W. Waggoner, K. C. Olson Jan 2013

Calf Health And Performance During Receiving Is Not Changed By Fence-Line Preconditioning On Flint Hills Range Vs. Drylot Preconditioning (2013), E.A. Bailey, G.W. Preedy, L.A. Pacheco, John R. Jaeger, Justin W. Waggoner, K. C. Olson

Kansas Agricultural Experiment Station Research Reports

Ranch-of-origin preconditioning can improve the welfare and performance of beef calves by decreasing the stress associated with weaning, transport, diet change, and commingling with other calves. Preconditioning methods that involve pasture weaning coupled with maternal contact (i.e., fence-line weaning) have been promoted as possible best management practices for minimizing stress. Prior studies focused on performance and behavior during preconditioning on the ranch of origin. Little information has been published relating to carryover effects of fence-line preconditioning compared with conventional drylot preconditioning on performance and behavior during feedlot receiving. Our objectives were to measure growth and health during a 28-day ranch-of-origin …

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Insecticide Ear Tags Numerically Improve Grazing Cattle Performance (2013), S.E. Hill, Brandon E. Oleen, William R. Hollenbeck, Christopher I. Vahl, Dale A. Blasi Jan 2013

Insecticide Ear Tags Numerically Improve Grazing Cattle Performance (2013), S.E. Hill, Brandon E. Oleen, William R. Hollenbeck, Christopher I. Vahl, Dale A. Blasi

Kansas Agricultural Experiment Station Research Reports

Stocker cattle grazing pastures during the summer months face challenges due to horn flies, which can result in reduced weight gains and less efficient use of forages. One strategy for controlling horn flies is insecticide-impregnated ear tags. The use of pesticide ear tags may be an effective management practice to improve overall productivity during a grazing season. The objective of this study was to evaluate the efficacy of insecticide ear tags as a means of improving growth of stocker calves grazing native pastures in the Flint Hills region of Kansas.

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Evidence Of Estrus Before Cidr Insertion Does Not Influence Pregnancy Rate To Fixed-Timed Artificial Insemination In Beef Heifers, Sandra K. Johnson, M.A. Ward, O.L. Swanson, G.A. Perry Jan 2013

Evidence Of Estrus Before Cidr Insertion Does Not Influence Pregnancy Rate To Fixed-Timed Artificial Insemination In Beef Heifers, Sandra K. Johnson, M.A. Ward, O.L. Swanson, G.A. Perry

Kansas Agricultural Experiment Station Research Reports

Protocols used for fixed-timed artificial insemination strive to synchronize growth of follicular waves and commonly do so by administration of gonadotropin-releasing hormone (GnRH) at the beginning of the treatment. The stage of the cycle at the time of GnRH injection influences the proportion of animals that respond, and cows respond more consistently than heifers. Variability in response to GnRH has been offered as an explanation for why why short-term fixed-timed insemination protocols tend to be less effective in heifers than cows. The dairy industry has used prostaglandin (PG) to "pre-synchronize" cow ovulation before a protocol to improve the proportion of …

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Effects Of Weaning On Body Condition Recovery And Calf Performance In Previously Nutritionally Restricted Cow-Calf Pairs (2013), M.A. Ward, Sandra K. Johnson Jan 2013

Effects Of Weaning On Body Condition Recovery And Calf Performance In Previously Nutritionally Restricted Cow-Calf Pairs (2013), M.A. Ward, Sandra K. Johnson

Kansas Agricultural Experiment Station Research Reports

Drought, defined as less than 75% of normal rainfall, occurs once every 5 to 7 years in Northwest Kansas. Record widespread drought conditions throughout the Midwest and Western United States in 2012 resulted in an early reduction in forage quality and availability. In these situations, cow-calf producers are faced with deciding how to adapt to the conditions. Some producers may be unprepared for the speed at which cows can lose body condition in the face of declining pasture conditions and how much it takes to regain body condition. Early weaning is one option that can improve a cow's nutritional status, …

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Exposure Of Prepubertal Beef Bulls To Cycling Females Affects Neither Age At Puberty Nor Ability To Pass An Initial Breeding Soundness Examination (2013), N. Miller, Ryan M. Breiner, Tom Taul, Sharon K. Tucker, Karol E. Fike Jan 2013

Exposure Of Prepubertal Beef Bulls To Cycling Females Affects Neither Age At Puberty Nor Ability To Pass An Initial Breeding Soundness Examination (2013), N. Miller, Ryan M. Breiner, Tom Taul, Sharon K. Tucker, Karol E. Fike

Kansas Agricultural Experiment Station Research Reports

Age at puberty is a crucial factor influencing a young bull's ability to pass a breeding soundness examination (BSE) at a year of age, and reducing that age may prove beneficial to beef producers. For beef females, exposure to mature bulls is known to hasten the onset of puberty and also can reduce the duration of postpartum anestrus. Relatively little research has evaluated the effects of female exposure on beef bull sexual development. Bulls are thought to use visualization rather than olfaction as their primary and preferred way to detect estrus in females. The purpose of this study was to …

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Dosing With Lactipro Decreases Forage Intake And Manure Output (2013), K.A. Miller, C.L. Van Bibber-Krueger, C.C. Aperce, C.A. Alvarado, James S. Drouillard Jan 2013

Dosing With Lactipro Decreases Forage Intake And Manure Output (2013), K.A. Miller, C.L. Van Bibber-Krueger, C.C. Aperce, C.A. Alvarado, James S. Drouillard

Kansas Agricultural Experiment Station Research Reports

High-concentrate diets consisting of cereal grains and grain byproducts have high energy density compared with forage-based diets. To avoid digestive disorders, cattle must be adapted to concentrates, which often entails feeding a series of step-up diets that contain progressively less roughage over a 2- to 3-week period. This allows the microbial population to adapt to fermentation of the starches and sugars that are present in high-concentrate diets. If cattle are not properly adapted to concentrate-based diets, lactic acid, which is produced by opportunistic starch-fermenting bacteria like Streptococcus bovis, can accumulate, predisposing the animal to acidosis. Diets used during the adaptation …

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Presynchronizing Pgf2Α And Gnrh Injections Before Timed Artificial Insemination Co-Synch + Cidr Program (2013), Scott L. Hill, Stephanie Leeann Pulley, K. C. Olson, John R. Jaeger, Ryan M. Breiner, G.C. Lamb, Jeffrey S. Stevenson Jan 2013

Presynchronizing Pgf2Α And Gnrh Injections Before Timed Artificial Insemination Co-Synch + Cidr Program (2013), Scott L. Hill, Stephanie Leeann Pulley, K. C. Olson, John R. Jaeger, Ryan M. Breiner, 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 artificial insemination programs requiring 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 …

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Dosing High-Risk Calves At Processing With Lactipro Decreases The Number Of Calves Treated For Bovine Respiratory Disease (2013), K.A. Miller, C.L. Van Bibber-Krueger, James S. Drouillard Jan 2013

Dosing High-Risk Calves At Processing With Lactipro Decreases The Number Of Calves Treated For Bovine Respiratory Disease (2013), K.A. Miller, C.L. Van Bibber-Krueger, James S. Drouillard

Kansas Agricultural Experiment Station Research Reports

Bovine respiratory disease is the leading cause of cattle mortalities in U.S. feedlots. In addition to costs associated with death loss and medical treatments, cattle affected by respiratory disease typically have suboptimal performance. Lightweight calves coming into the feedlot are at high risk for respiratory disease due to the stress associated with weaning, transportation, feed and water deprivation, commingling, castration, and other factors. Calves often have no experience eating from feed bunks and may be unfamiliar with the types of feeds used in feedlots. At the same time, the cattle are susceptible to acidosis due to the concentrate-based diets that …

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Efficiency Of Early Weaned Beef Calves Is Not Improved By Restricting Feed Intake During 84-Day Growing Phase (2013), E.A. Bailey, G.W. Preedy, L.A. Pacheco, John R. Jaeger, Justin W. Waggoner, K. C. Olson Jan 2013

Efficiency Of Early Weaned Beef Calves Is Not Improved By Restricting Feed Intake During 84-Day Growing Phase (2013), E.A. Bailey, G.W. Preedy, L.A. Pacheco, John R. Jaeger, Justin W. Waggoner, K. C. Olson

Kansas Agricultural Experiment Station Research Reports

Early weaning can be used by cow-calf producers to reduce stocking rates by 20% to 30% during drought. Ranchers may be reluctant to wean early because of reduced calf weights and reduced revenue compared with weaning calves at conventional ages. To avoid revenue shortfalls, calves can be retained and grown before selling; however, grain prices are currently at unprecedented levels. Feeding grain-based diets to calves less than 125 days of age has been associated with excessive fat accumulation early in the feeding period and decreased carcass weights. Conversely, several researchers have noted marked improvements in feed efficiency when grain-based finishing …

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