David Lalman
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View article: An Investigation into the Elements Influencing Cattle Producers' Preference for Specific Information Sources
An Investigation into the Elements Influencing Cattle Producers' Preference for Specific Information Sources Open
Cow/calf producers in Oklahoma, like their counterparts in other agricultural sectors, depend on a variety of information sources to navigate the complexities of their operations effectively. However, research on the specific reasons produ…
View article: 168 Effect of cow metabolizable energy intake on calf growth performance in crossbred Angus beef cattle
168 Effect of cow metabolizable energy intake on calf growth performance in crossbred Angus beef cattle Open
A two-yr experiment was conducted to determine the impact of maternal metabolizable energy intake (MEI) on energy partitioning and performance of crossbred Angus cows and their calves. Forty mature crossbred Angus lactating beef cows (6±2 …
View article: 153 The linear relationship of forage intake, residual feed intake, and greenhouse gas emissions between lactation and gestation in beef cows
153 The linear relationship of forage intake, residual feed intake, and greenhouse gas emissions between lactation and gestation in beef cows Open
The objective of this study was to determine the linear relationship of dry matter intake (DMI), residual feed intake (RFI), and greenhouse gas emissions among stages of production in mature beef cows fed an unprocessed grass hay diet. For…
View article: 189 Selection for moderate or high growth Angus-derived steer calves and their effects on feed intake and performance metrics during a 70-day feed intake period
189 Selection for moderate or high growth Angus-derived steer calves and their effects on feed intake and performance metrics during a 70-day feed intake period Open
Improvement in feed efficiency can improve beef cattle production’s sustainability. Measurements such as residual feed intake (RFI) or residual average daily gain (RADG) are used to assess feed efficiency of an animal. The objective of thi…
View article: 163 Characterizing performance, forage intake, and feed efficiency in beef heifers fed a grass hay diet using residual feed intake and residual average daily gain
163 Characterizing performance, forage intake, and feed efficiency in beef heifers fed a grass hay diet using residual feed intake and residual average daily gain Open
The objective of this study was to characterize performance (ADG) and forage intake (DMI) in beef replacement heifers classified for forage efficiency using residual feed intake (RFI) and residual average daily gain (rADG). Fifty-five fall…
View article: 187 Does selection of beef cattle for production traits impact post-weaning immunological phenotype and robustness traits
187 Does selection of beef cattle for production traits impact post-weaning immunological phenotype and robustness traits Open
The objective of this study was to determine the effects of selection focused on performance traits on phenotypic expression of immune competence of growing beef steers. Steers selected for high and moderate growth and high and low milk pr…
View article: 148 Correlation of sensor-based heart rate values (701x xTpro® and Polar® equine heart rate monitor) in crossbred Angus heifers
148 Correlation of sensor-based heart rate values (701x xTpro® and Polar® equine heart rate monitor) in crossbred Angus heifers Open
An experiment was conducted at Oklahoma State University to evaluate the usability and performance of the 701x xTpro® ear tag (xTpro; 701x, Fargo, ND) as a sensor for monitoring heart rate (HR) in crossbred Angus heifers under feedlot cond…
View article: 17 Effects of body condition score change on breeding interval in commercial beef herds in Western Oklahoma
17 Effects of body condition score change on breeding interval in commercial beef herds in Western Oklahoma Open
Body condition scoring (BCS) is a critical management tool in beef cattle production. Cows with optimal body condition are more likely to conceive, maintain pregnancy, and calve successfully. Monitoring and maintaining appropriate BCS can …
View article: 290 The continued search for the elusive optimum cow
290 The continued search for the elusive optimum cow Open
Dr. Harlan Ritchie contributed a rather famous proceedings paper at the 1995 Beef Improvement Federation meetings entitled “The Search for the Elusive Optimum Cow”. In this publication, he mentions the tug-of-war (or antagonisms) between c…
View article: The relationship of lactating beef cow metabolizable energy intake to energy partitioning, milk composition, and calf performance
The relationship of lactating beef cow metabolizable energy intake to energy partitioning, milk composition, and calf performance Open
A 2-yr experiment was conducted to determine the impact of maternal metabolizable energy intake (MEI) on energy partitioning and performance of beef cows and calves. Forty mature crossbred Angus beef cows (6 ± 2.0 yr, 534 ± 60 kg BW) were …
View article: Effects of increasing supplementation rates of extruded distillers’ grains cubes on stocker steer production grazing native range in Western Oklahoma
Effects of increasing supplementation rates of extruded distillers’ grains cubes on stocker steer production grazing native range in Western Oklahoma Open
Our objectives were to determine the response curve of increasing supplementation rate with extruded distillers’ grains (DDG) cubes for animal performance, supplement conversion ratio, and N excretion by steers grazing midgrass prairie in …
View article: 195 Effect of selection for growth and maternal influence on crossbred Angus heifer development
195 Effect of selection for growth and maternal influence on crossbred Angus heifer development Open
This multiyear experiment was designed to determine the effects of sire yearling weight (YW) and maternal influence (MILK) expected progeny differences (EPD) on production and fertility of beef replacement heifers. Sires were classified as…
View article: 406 Impacts of drought on long term cow-calf productivity and potential management strategies for producers to overcome these challenges
406 Impacts of drought on long term cow-calf productivity and potential management strategies for producers to overcome these challenges Open
Our climate in North America has shifted to what appears to be a dry cycle reminiscent of the 1930s and 1950s. There are predictions of extended periods of drought and other climate perturbations interspersed with short periods of respite.…
View article: 96 Using greenhouse gas flux to estimate forage dry matter intake in ad libitum fed replacement heifers
96 Using greenhouse gas flux to estimate forage dry matter intake in ad libitum fed replacement heifers Open
An accurate estimate of feed intake is a critical component in determining individual animal feed efficiency. However, existing feed intake measurement systems are not designed for unprocessed, dry forage diets. Open-circuit gas flux techn…
View article: 150 Effects of diet type on performance and methane yield in replacement beef heifers
150 Effects of diet type on performance and methane yield in replacement beef heifers Open
The objective of this experiment was to determine the relationships among enteric gas production, body weight (BW) gain, and feed intake for growing heifers consuming two energy divergent diets. Fifty-five fall born yearling Angus and Angu…
View article: 34 A survey of the Oklahoma State University Cowculator user preferences
34 A survey of the Oklahoma State University Cowculator user preferences Open
The Oklahoma State University Cowculator is a free, easy to use model designed to assist cattle producers in making informed decisions regarding the nutrition of their herd. The Cowculator operates as a spreadsheet-based model, which colle…
View article: 3 Measuring feed intake in cows
3 Measuring feed intake in cows Open
In recent years, substantial progress has been made in understanding the sources of biological variation and genetic components of feed efficiency in growing animals consuming energy-dense mixed diets during the post-weaning phase. Much le…
View article: 97 Use of genomic testing for predicting performance of finishing steers
97 Use of genomic testing for predicting performance of finishing steers Open
Genomic testing is a commercially available tool that has the potential to be beneficial in selecting cattle for retained ownership, as well as making management and marketing decisions after finishing. The objectives of this study were to…
View article: Predicting feed intake in confined beef cows
Predicting feed intake in confined beef cows Open
Six existing equations (three for nonlactating and three for lactating; NRC, 1987, Predicting feed intake of food-producing animals. Washington, DC: The National Academies Press, National Academy of Science; doi: 10.17226/950; NRC, 1996, N…
View article: 439 Identifying Forage Efficient Cows
439 Identifying Forage Efficient Cows Open
In recent years, substantial progress has been made in understanding the sources of biological variation and genetic components of feed efficiency in growing animals consuming energy-dense mixed diets during the post-weaning phase. Much le…
View article: PSV-12 Effects of Diet on Feed Intake, Weight Change, and Gas Emissions in Beef Cows
PSV-12 Effects of Diet on Feed Intake, Weight Change, and Gas Emissions in Beef Cows Open
The objective of this study was to examine the effects of diet energy density on ranking for dry matter intake (DMI), residual feed intake (RFI), and greenhouse gas emissions. Forty-two mature, gestating Angus cows [600 ± 69 kg body weight…
View article: 151 Effect of Neogen Igenity Beef Index Scores on Performance of Steers During Finishing
151 Effect of Neogen Igenity Beef Index Scores on Performance of Steers During Finishing Open
Genomic testing of feeder cattle is reported to be beneficial in selecting cattle for the feedlot, as well as making management and marketing decisions. The objective of this study was to determine differences in performance and efficiency…
View article: 136 Relationship of Mature Beef Cows on an Unprocessed Hay Diet to Residual Intake and Greenhouse Gas Exchange During Gestation and Lactation
136 Relationship of Mature Beef Cows on an Unprocessed Hay Diet to Residual Intake and Greenhouse Gas Exchange During Gestation and Lactation Open
The objective of this study was to compare residual feed intake (RFI) and greenhouse gas exchange in mature beef cows during gestation and lactation when consuming an unprocessed, grass hay diet. Twenty-six mature Angus and Angus x Herefor…
View article: 137 Replacement Heifer Gain, Feed Intake and Efficiency While Consuming an Unprocessed Hay Diet Followed by a Mixed Concentrate/Forage Diet
137 Replacement Heifer Gain, Feed Intake and Efficiency While Consuming an Unprocessed Hay Diet Followed by a Mixed Concentrate/Forage Diet Open
The objective of this study was to evaluate weight gain, feed intake, and feed efficiency in beef heifers while consuming two diets divergent in energy density. Fifty-four yearling Angus and Angus cross heifers (initial body weight = 307.5…
View article: The Effects of Respiratory Vaccine Type and Timing on Antibody Titers, Immunoglobulins, and Growth Performance in Pre- and Post-Weaned Beef Calves
The Effects of Respiratory Vaccine Type and Timing on Antibody Titers, Immunoglobulins, and Growth Performance in Pre- and Post-Weaned Beef Calves Open
In order to examine the effects of vaccine type and timing of crossbred beef calves (n = 151) were assigned to one of three BRD vaccination protocols stratified by breed of sire, sex, and date of birth, which included: (1) KM—a pentavalent…
View article: Effects of adding ruminal propionate on dry matter intake and glucose metabolism in steers fed a finishing ration
Effects of adding ruminal propionate on dry matter intake and glucose metabolism in steers fed a finishing ration Open
The objective of this experiment was to determine if supplying additional propionate to the rumen alters dry matter intake (DMI), feeding behavior, glucose metabolism, and rumen fluid metabolites in steers fed a finishing diet. Ruminally c…
View article: Economics of Smaller Aberdeen-Derived Beef Cows
Economics of Smaller Aberdeen-Derived Beef Cows Open
We investigate differences in profitability of three Aberdeen-influenced breeds, Angus, Red Angus, and American Aberdeen. Using data from North Dakota, we measure differences in birth weights, calving intervals, weaning weights, cow weight…
View article: 320 Effect of Breed of Sire and Calving Season on Feedlot Performance and Carcass Characteristics
320 Effect of Breed of Sire and Calving Season on Feedlot Performance and Carcass Characteristics Open
Four years of feedlot performance and carcass characteristics were pooled on spring-(SPRING) and fall-(FALL) born steers (n=460) into a mixed model to evaluate the effects of calving season, sire breed (Angus [AN], Charolais [CHAR] or Here…
View article: PSVII-1 Effect of the Sequence of Feeding Forage and Concentrate-Based Diets on dry Matter Intake and Average Daily Gain of Growing Angus Bulls
PSVII-1 Effect of the Sequence of Feeding Forage and Concentrate-Based Diets on dry Matter Intake and Average Daily Gain of Growing Angus Bulls Open
The objective of this experiment was to determine the effects of diet type and sequence on average daily gain (ADG) and feed intake (DMI) in Angus bulls. Diets were concentrate (CONC; 58% dry-rolled corn, 18% Sweet Bran, 9% prairie hay, 5%…
View article: 180 Importance and Practices of Interaction with Producers and Industry for Land-Grant Animal Science Faculty: How are These Practices Developed and Implemented?
180 Importance and Practices of Interaction with Producers and Industry for Land-Grant Animal Science Faculty: How are These Practices Developed and Implemented? Open
The Morrill Land Grant Act of 1862 created colleges to “benefit the agricultural and mechanical arts” and established one college per state “where the leading object shall be…to teach such branches of learning as are related to agriculture…