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Articles 5701 - 5730 of 302419

Full-Text Articles in Physical Sciences and Mathematics

Efficiency Optimization Method For Data Sampling In Power Grid Topology Scheduling Simulation, Yingying Zhao, Pusen Dong, Tianchen Zhu, Fan Li, Yun Su, Zhenying Tai, Qingyun Sun, Hang Fan Feb 2024

Efficiency Optimization Method For Data Sampling In Power Grid Topology Scheduling Simulation, Yingying Zhao, Pusen Dong, Tianchen Zhu, Fan Li, Yun Su, Zhenying Tai, Qingyun Sun, Hang Fan

Journal of System Simulation

Abstract: To address the large simulation computational workload and low simulation speed caused by the scale and complexity of the new power system, a simulation acceleration method for topology scheduling based on the distributed and quantization mechanisms is proposed. The parallelization of topology scheduling models is used to increase the scale of data simulation sampling in unit time. The introduced quantization operators accelerate the computation speed of the topology scheduling model operators, reduces the time cost of the every single simulation. Case studies confirm the effectiveness of the topology simulation acceleration, in which the available transfer capacity of the simulated …

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Optimal Dispatch Of Microgrid Clusters Considering Energy Storage Life And Communication Failures, Jianfang Jiao, Anjie Wang, Guang Wang, Jiale Xie Feb 2024

Optimal Dispatch Of Microgrid Clusters Considering Energy Storage Life And Communication Failures, Jianfang Jiao, Anjie Wang, Guang Wang, Jiale Xie

Journal of System Simulation

Abstract: To ensure the economy and stability of microgrid operation, the power fluctuations of renewable energy source (RES) and the lifetime characteristics of battery energy storage system (BESS) should be considered. The influence of charging and discharging depth and rate on the lifetime of BESS is researched, a model of battery energy storage system for real-time optimal scheduling is established, and the alternating direction method of multipliers is adopted for the distributed optimal scheduling of microgrid clusters. The distributed optimization method does not require any global information and can protect the privacy of microgrid in the maximum extent. Simulation results …

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Runoff Intelligent Prediction Method Based On Broad-Deep Fusion Time-Frequency Analysis, Ying Han, Lehao Wang, Shumei Wang, Xiang Zhang, Xingxing Luo Feb 2024

Runoff Intelligent Prediction Method Based On Broad-Deep Fusion Time-Frequency Analysis, Ying Han, Lehao Wang, Shumei Wang, Xiang Zhang, Xingxing Luo

Journal of System Simulation

Abstract: Broad learning system(BLS) is introduced to tackle the existed disadvantage that LSTM-based runoff prediction model is easy to fall into local optimization. To reduce the influence of noise on the prediction results, the variational mode decomposition (VMD) is adopted to transform the onedimensional time-domain runoff signal to the two-dimensional time-frequency plane. The runoff prediction model based on VMD-LSTM-BLS is proposed. The simulation results demonstrate that the prediction accuracy of the new model is more significantly improved compared with the baseline model and the existing LSTM-based runoff prediction model.

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Flipper Control Method For Tracked Robot Based On Deep Reinforcement Learning, Hainan Pan, Bailiang Chen, Kaihong Huang, Junkai Ren, Chuang Cheng, Huimin Lu, Hui Zhang Feb 2024

Flipper Control Method For Tracked Robot Based On Deep Reinforcement Learning, Hainan Pan, Bailiang Chen, Kaihong Huang, Junkai Ren, Chuang Cheng, Huimin Lu, Hui Zhang

Journal of System Simulation

Abstract: Tracked robots with flippers have certain terrain adaptation capabilities. To improve the intelligent operation level of robots in complex environments, it is significant to realize the flipper autonomously control. Combining the expert experience in obstacle crossing and optimization indicators, Markov decision process(MDP) modeling of the robot's flipper control problem is carried out and a simulation training environment based on physics simulation engine Pymunk is built. A deep reinforcement learning control algorithm based on dueling double DQN(D3QN) network is proposed for controlling the flippers. With terrain information and robot state as the input and the four flippers' angle as the …

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Robust Predictive Control Of Nonplanar Fully-Actuated Uavs, Yun Ma, Yuan Wang, Meng Li, Peng Wang, Yanling Tang Feb 2024

Robust Predictive Control Of Nonplanar Fully-Actuated Uavs, Yun Ma, Yuan Wang, Meng Li, Peng Wang, Yanling Tang

Journal of System Simulation

Abstract: Targeting the problem that nonplanar fully-actuated unmanned aerial vehicles (UAVs) are susceptible to external winds and unmodeled dynamics, the predictive control system with good robustness is designed. A nonlinear motion model with six degrees of freedom is established through the Newton-Euler approach. A linear extended state observer is designed to estimate the state variables by transforming the system affected by matched and unmatched disturbances into an equivalent system only affected by the matched disturbances. A predictive controller is designed for the equivalent system to reduce the output oscillation and input surging and a disturbance compensator is also designed to …

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Improved Multi-Objective Swarm Algorithm To Optimize Wash-Out Motion And Its Simulation Experiment, Hui Wang, Le Peng Feb 2024

Improved Multi-Objective Swarm Algorithm To Optimize Wash-Out Motion And Its Simulation Experiment, Hui Wang, Le Peng

Journal of System Simulation

Abstract: Addressing the issues such as signal loss, distraction, and bad wash-out effect caused by improper parameter selection in classic wash-out algorithms, an improved multi-objective artificial bee colony algorithm is proposed to optimize the filter parameters of the classical wash-out algorithm to improve the effect. For the problems in the initialization and local optimization of traditional swarm algorithm, Circle mapping and Pareto local optimization algorithm are introduced. The human perception error model, acceleration difference model, and displacement model are established, and the model function is used as the objective function, the parameters of the classical wash-out algorithm is optimized by …

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Bus Traffic Strategy Based On Immune Theory In Network Environment, Cao Li, Rui Zheng, Xiaolu Ma, Ziqiong Ding, Junyi Zhong, Sheng Zhang, Jingjing Qi Feb 2024

Bus Traffic Strategy Based On Immune Theory In Network Environment, Cao Li, Rui Zheng, Xiaolu Ma, Ziqiong Ding, Junyi Zhong, Sheng Zhang, Jingjing Qi

Journal of System Simulation

Abstract: In V2X network environment, the bus system can obtain dynamic global information and the bus traffic strategy is carried out based on the road scene between adjacent bus stops. The mathematical model of bus rapid traffic is constructed with the difference of green time ratio as the main parameter. A hybrid genetic operator is proposed on the basis of the combination of genetic algorithm and immune theory, the design of affinity, the selection of excellent antibodies. A bus traffic strategy based on immune theory is proposed on the basis of the improvement of adaptive crossover and mutation probability. The …

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Reconnaissance Mission Planning Method For Air-Ground Heterogeneous Unmanned Systems, Guohui Zhang, Ya'nan Zhang, Ang Gao, Aoyu Xu Feb 2024

Reconnaissance Mission Planning Method For Air-Ground Heterogeneous Unmanned Systems, Guohui Zhang, Ya'nan Zhang, Ang Gao, Aoyu Xu

Journal of System Simulation

Abstract: Compared with the air-based homogeneous unmanned system, the motion capabilities, resource payloads, and combat scenes in the air-ground heterogeneous unmanned system increase the number of constraint conditions and significantly increase the computational complexity of the solution model. The modeling of collaborative combat missions and the efficient solution of large-scale problems are the key issues. With the time, path cost, and reconnaissance benefit as the objective functions, considering the constraints such as the endurance of unmanned platforms, a multi-objective programming model for the reconnaissance missions of an air-ground heterogeneous unmanned system is constructed. Aiming at the urban combat environments with …

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Ground Target Recognition And Damage Assessment Of Patrol Missiles Based On Multi-Source Information Fusion, Yibo Xu, Qinghua Yu, Yanjuan Wang, Ce Guo, Shiru Feng, Huimin Lu Feb 2024

Ground Target Recognition And Damage Assessment Of Patrol Missiles Based On Multi-Source Information Fusion, Yibo Xu, Qinghua Yu, Yanjuan Wang, Ce Guo, Shiru Feng, Huimin Lu

Journal of System Simulation

Abstract: For the multiple patrol missiles to attack the high defense capacity targets, a mobile ground target detection and damage assessment method based on multi-source information fusion is proposed. The multi-source information fusion of infrared images and RGB images is carried out by using IoU determination. A novel two-stage tightly coupled damage assessment method based on YOLO-VGGNet of patrol missiles to mobile ground targets is proposed. This method can fully use the advantage of deep semantic information extraction of CNNs and introduce the infrared damaging information simultaneously to achieve the online and real-time damage assessment of mobile ground targets. The …

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Design And Application Of Hardware-In-The-Loop Simulation System For Infrared Imaging Guide Missile Test And Evaluation, Jianbin Dou, Xiaobing Wang, Hongjian Yang, Yulong Gao Feb 2024

Design And Application Of Hardware-In-The-Loop Simulation System For Infrared Imaging Guide Missile Test And Evaluation, Jianbin Dou, Xiaobing Wang, Hongjian Yang, Yulong Gao

Journal of System Simulation

Abstract: The characteristics of the army's conventional infrared imaging guide missile hardware-in-theloop simulation system used for test and evaluation is analyzed, and a system that can meet the test and evaluation requirement of infrared imaging guide missile is designed. The key technologies such as universal system design, rapid iterative development design of heterogeneous communication data, high radiation infrared interference dual channel coupling simulation, high-precision timing and synchronization, generation of complex battlefield environment are solved. The application of the system is verified on the typical anti-tank missile and helicopter borne missile tests. The system can be used for infrared imaging guide …

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A Simplification Method Of Large-Scale Unit Commitment Model Based On Boundary Method, Yanping Xu, Mingxin Zhao, Xiaohui Qin, Keyou He, Xiaohan Wu, Pei Zhang Feb 2024

A Simplification Method Of Large-Scale Unit Commitment Model Based On Boundary Method, Yanping Xu, Mingxin Zhao, Xiaohui Qin, Keyou He, Xiaohan Wu, Pei Zhang

Journal of System Simulation

Abstract: As the scale of power grid expands, in the market environment, the variables and constraints in the security-constrained unit commitment (SCUC) model considering power grid security constraints increase significantly and the solvability of the model reduces. When the model scale is too large, even the existing commercial solvers cannot solve it. Aiming at the model rapid solving, from the perspective of reducing the number of model constraints, a linear constraint simplification method based on the boundary method is proposed. The proposed method can effectively reduce the model's size by eliminating the redundant linear constraints. The IEEE-39, WECC 179 and …

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Research Advances On Electric Vehicle Routing Problem Models And Algorithms, Helin Zhuang, Xiaoyun Xia, Kangshun Li, Zefeng Chen, Xianchao Zhang Feb 2024

Research Advances On Electric Vehicle Routing Problem Models And Algorithms, Helin Zhuang, Xiaoyun Xia, Kangshun Li, Zefeng Chen, Xianchao Zhang

Journal of System Simulation

Abstract: The development of electric vehicle provides an alternative to conventional fuel vehicles for logistics companies. Using electric vehicles has the merits of less pollution and low noise, but the characteristics of limited cruising range and limited number of charging stations are new challenges. Electric vehicle routing problems(EVRPs) have been widely used in transportation, logistics and other fields, and have received much attention. A comprehensive survey of EVRP and its many variants are presented and the respective backgrounds and applicable conditions are analyzed. The solving approaches of EVRPs are categorized, the strengths and weaknesses of each algorithm are analyzed, and …

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Gauss Circle Problem Over Smooth Integers, Ankush Goswami Feb 2024

Gauss Circle Problem Over Smooth Integers, Ankush Goswami

School of Mathematical and Statistical Sciences Faculty Publications and Presentations

For a positive integer 𝑛, let 𝑟2(𝑛) be the number of representations of 𝑛 as sums of two squares (of integers), where the convention is that different signs and different orders of the summands yield distinct representations. A famous result of Gauss shows that 𝑅(𝑥) ∶= ∑ 𝑛≤𝑥 𝑟2(𝑛) ∼ 𝜋𝑥. Let 𝑃(𝑛) denote the largest prime factor of 𝑛 and let 𝑆(𝑥, 𝑦) ∶= {𝑛 ≤ 𝑥 ∶ 𝑃(𝑛) ≤ 𝑦}. In this paper, we study the asymptotic behavior of 𝑅(𝑥, 𝑦) ∶= ∑ 𝑛∈𝑆(𝑥,𝑦) 𝑟2(𝑛) for various ranges of 2 ≤ 𝑦 ≤ 𝑥. For 𝑦 in a …

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Search For Decaying Dark Matter In The Virgo Cluster Of Galaxies With Hawc, A. Albert, R. Alfaro, C. Alvarez, J. C. Arteaga-Velázquez, H. A. Ayala Solares, R. Babu, R. Turner, X. Wang, Et Al. Feb 2024

Search For Decaying Dark Matter In The Virgo Cluster Of Galaxies With Hawc, A. Albert, R. Alfaro, C. Alvarez, J. C. Arteaga-Velázquez, H. A. Ayala Solares, R. Babu, R. Turner, X. Wang, Et Al.

Michigan Tech Publications, Part 2

The decay or annihilation of dark matter particles may produce a steady flux of very-high-energy gamma rays detectable above the diffuse background. Nearby clusters of galaxies provide excellent targets to search for the signatures of particle dark matter interactions. In particular, the Virgo cluster spans several degrees across the sky and can be efficiently probed with a wide field-of-view instrument. The High Altitude Water Cherenkov (HAWC) observatory, due to its wide field of view and sensitivity to gamma rays at an energy scale of 300 GeV-100 TeV is well-suited for this search. Using 2141 days of data, we search for …

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Challenges Of Stray Cattle On Integrated Crop-Forage Resources In India, Pal Mahendra Singh Feb 2024

Challenges Of Stray Cattle On Integrated Crop-Forage Resources In India, Pal Mahendra Singh

IGC Proceedings (1993-2023)

Field survey was conducted covering 1000 residents of district Udham Singh Nagar, Uttarakhand states of India in January 2022 including farmers, school teachers, students and residents of town and cities to study the ‘challenges and threats of stray animals on crop-forage resources in India. The survey indicated that 97.5, 75.6, 60.0, 77.8%, and 68.9 respondents had strong opinion that stray cattle were the serious threat to crops-forage resources, biodiversity, road accidents, transmitting harmful diseases and human-wildlife conflict, respectively, while 85.5, 67.7, 62.7,76.2 and 70.5% respondents gave their consent to solve stray cattle by opening of cowsheds, strict government policies, mass …

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Optimizing Production Technology For Sustainable Organic Fodder Production And Soil Health In Indo-Gangetic Plains Of India, Pal Mahendra Singh Feb 2024

Optimizing Production Technology For Sustainable Organic Fodder Production And Soil Health In Indo-Gangetic Plains Of India, Pal Mahendra Singh

IGC Proceedings (1993-2023)

Field experiment was carried at Instructional Dairy Farm, G B Pant University of Agriculture & Technology, Pantnagar (India) during 2020-21 and 2021-22 to optimize the production technology for sustainable organic fodder production and soil health in Indo-Gangetic plains of India. Among the organic production systems, application of vermicompost @ 5 t/ha gave the highest fodder yield, gross return and net return but the B:C ratio was derived highest from zero budget natural farming. Among the Kharif crops grown in different cropping systems, BN hybrid intercropped with cowpea gave the significant higher green and dry fodder yield, gross return, net return …

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The Combined Role Of Microbes And Forages In Animal Productivity, K. Panke-Buisse Feb 2024

The Combined Role Of Microbes And Forages In Animal Productivity, K. Panke-Buisse

IGC Proceedings (1993-2023)

Agricultural systems, particularly ruminant systems, are underpinned by diverse, functional microbial communities—in the soil, forage, silo, and rumen. We have relied on the jobs they perform on our behalf, but only recently have we been able to look “under the hood” at the membership and mechanisms within these microbiomes and begin to think about optimization. Ensiling is a common method of forage preservation globally and represents a highly intensive intersection between forage and microbiology, which has been shown to have beneficial effects on forage quality and dairy animal performance. However, observations of enhanced productivity, especially in the context of inoculated …

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Determining ‘Wether’ Social Behaviour Or Pasture Quality Drives Sheep Grazing Patterns Using Random Forest Modelling, D. J. Parnell, L. Ingram, J. Edwards Feb 2024

Determining ‘Wether’ Social Behaviour Or Pasture Quality Drives Sheep Grazing Patterns Using Random Forest Modelling, D. J. Parnell, L. Ingram, J. Edwards

IGC Proceedings (1993-2023)

Monitoring livestock provides valuable insights into the spatial distribution, foraging patterns, and animal behaviour, which may lead to the improved management of livestock. This objective of study was to understand what variables were significant in determining where sheep spent the most time in paddocks of native (dominated by Poa spp., Stipa spp., and Hordeum leporinum), and improved (Phalaris aquatica, Festuca spp., and Trifolium subterraneum) pastures (~24 ha-1 in size). Castrated male sheep, wethers, were tracked using GPS collars on a property located in the Monaro region of Southern New South Wales, Australia. Trials were performed over …

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Ruminant Agriculture: A Tool For Climate Change Mitigation, B. L. Peterson Munks, M. Rellaford, J. Shanahan, S. Urbanowitz, F. Wang, S. Wang, Y. Zhao, E. Bender Feb 2024

Ruminant Agriculture: A Tool For Climate Change Mitigation, B. L. Peterson Munks, M. Rellaford, J. Shanahan, S. Urbanowitz, F. Wang, S. Wang, Y. Zhao, E. Bender

IGC Proceedings (1993-2023)

The quest to address and mitigate climate change has been dubbed a “wicked problem” as it involves many interconnected processes requiring a multifaceted, comprehensive approach. Animal agriculture contributes roughly 15% to CO2 equivalent (CO2e) emissions; as a result, a concerted effort is being made to develop and promote more climate-friendly production practices. These practices include species diversification in grasslands, improving grazing rotation, adding nitrogen amendments, and the use of feed additives to reduce enteric fermentation. Successful inter-seeding of legumes and deep-rooted native grasses increases soil organic carbon (SOC) pools in many systems by increasing the biological carbon inputs to the …

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Economics And Other Factors Affecting The Adoption Of Novel Endophyte Technology, M. H. Poore, J. Horner Feb 2024

Economics And Other Factors Affecting The Adoption Of Novel Endophyte Technology, M. H. Poore, J. Horner

IGC Proceedings (1993-2023)

Endophyte infected tall fescue impacts cattle and other livestock across vast regions of the world. Toxicosis from wild type endophyte is widespread in regions where toxic tall fescue is the base perennial forage. The Alliance for Grassland Renewal was founded to address this complex issue and to facilitate appropriate adoption of Novel Endophyte Tall Fescue, the only potentially 100% effective remedy for fescue toxicosis. A poor understanding of the Cost/Benefit ratio of renovating pasture is one of the main reason farmers give for not renovating tall fescue pastures. An Excel-based spreadsheet tool was developed by University of Missouri Extension to …

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Physiological And Behavioral Responses Of Heifers That Graze Tall Fescue Infected By Wild-Type Or Novel Endophytes, S. Poudel, A. Halili, L. Wright, G. Pent, J. Fike Feb 2024

Physiological And Behavioral Responses Of Heifers That Graze Tall Fescue Infected By Wild-Type Or Novel Endophytes, S. Poudel, A. Halili, L. Wright, G. Pent, J. Fike

IGC Proceedings (1993-2023)

Fescue toxicosis presents serious challenges and huge economic losses to the beef industry in the U.S. Replacing tall fescue (TF) infected by wild-type endophyte (WE) with TF infected by novel endophyte can eliminate this problem but adoption of this technology has been limited. We aimed at demonstrating the physiological and behavioral responses of heifers that grazed either WE or NE TF using relatively non-invasive techniques. Angus or Angus cross heifers (n = 24) were assigned to either WE or NE pastures for a 56-d grazing period during the summers of 2020 and 2021. Heifer ADG and hair retention scores were …

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Smallholder Zebu And Forage Production Development In Central Madagascar, L. Randriamanalina, M. S. Vorontsova, M. T. Rajaonah, O. P. Nanjarisoa, C. E. R. Lehmann, D. Miharinjanahary, H. N. S. Ratovoarinjaka, A. Bendrainy, C. Rijaniaina, A. M. Rabendrina, D. Rabeharison, B. F. Rakotozafy, F. Rakotoarison, D. Tahirinirainy, T. Randriamboavonjy, H. Ralimanana, J. Raharimampionona, C. Birkinshaw, W. Truter Feb 2024

Smallholder Zebu And Forage Production Development In Central Madagascar, L. Randriamanalina, M. S. Vorontsova, M. T. Rajaonah, O. P. Nanjarisoa, C. E. R. Lehmann, D. Miharinjanahary, H. N. S. Ratovoarinjaka, A. Bendrainy, C. Rijaniaina, A. M. Rabendrina, D. Rabeharison, B. F. Rakotozafy, F. Rakotoarison, D. Tahirinirainy, T. Randriamboavonjy, H. Ralimanana, J. Raharimampionona, C. Birkinshaw, W. Truter

IGC Proceedings (1993-2023)

Poverty in the Central Highlands of Madagascar is partly driven by inefficient exploitation of native forages and poor livestock nutrition. Zebus are of importance as cultural symbols, but this tradition has grown disconnected from agricultural policy. This project is working with three central highland communities near the protected areas of Itremo, Ibity and Ankafobe, to boost rangeland productivity and trial management methods which will support key forage grasses and improve livestock nutrition. A severe nitrogen deficiency compounded by extremely acidic soil conditions and low phosphorus is observed across the three sites. The lowest grazing capacity of an estimated 0.7 livestock …

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Dry Season Feeding Strategies And Winter Forage Production By Communal Area Sheep Farmers Of The Eastern Cape Province In South Africa, B. Moyo, K. E. Ravhuhali Feb 2024

Dry Season Feeding Strategies And Winter Forage Production By Communal Area Sheep Farmers Of The Eastern Cape Province In South Africa, B. Moyo, K. E. Ravhuhali

IGC Proceedings (1993-2023)

Experimental research into the possibility of employing winter forages as a low-cost, high-quality winter supplement has produced promising outcomes. The extent, challenges, and mitigation strategies of communal farmers involved in winter fodder production in the Eastern Cape are unknown. This study examines farmers' knowledge, attitudes, and perceptions of winter fodder production, its difficulties, and perceived advantages for communal sheep farmers. The study was carried out in the Swartwater communal area of the Eastern Cape province of South Africa. Thirty-two sheep farmers who cultivate winter forage were interviewed using a structured questionnaire. Using SPSS 17, descriptive statistics were produced for the …

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Harvesting Site Influenced The Concentration Level Of Nitrogen And Mineral Status Of Woody Species In Semi-Arid Areas Of South Africa, K. E. Ravhuhali, H. S. Mudau, H. K. Mokoboki, B. Moyo, L. E. Motsei Feb 2024

Harvesting Site Influenced The Concentration Level Of Nitrogen And Mineral Status Of Woody Species In Semi-Arid Areas Of South Africa, K. E. Ravhuhali, H. S. Mudau, H. K. Mokoboki, B. Moyo, L. E. Motsei

IGC Proceedings (1993-2023)

Feed shortages in semi-arid areas cause a major set-back for livestock production. An understanding of the nutritive value of woody species in most parts of savanna regions can be vital to predicting what these species can offer for livestock productivity. The study assessed the variation in nitrogen and mineral concentration of leaves of woody species as influenced by harvesting site in South Africa. The study sites were communal areas in Limpopo and North West provinces. A total of 52 browse species were selected and used for this study. All statistical tests showed that there was a significant effect of species …

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Winter Herbage Mass Accumulation And Animals Grazing Days Of Set Stocking Or Cell Grazing Dairy X Beef Systems In Southwest England, M. J. Rivero, Sarah Morgan, Maite Fajardo, G. Irisarri, P. Chilibroste Feb 2024

Winter Herbage Mass Accumulation And Animals Grazing Days Of Set Stocking Or Cell Grazing Dairy X Beef Systems In Southwest England, M. J. Rivero, Sarah Morgan, Maite Fajardo, G. Irisarri, P. Chilibroste

IGC Proceedings (1993-2023)

Cell grazing (CG) has shown to increase the production per hectare by allowing higher stocking rates, greater grass production and higher herbage utilisation throughout the grazing season compared to set stocking (SS). Our objective was to compare the herbage growth rate during winter resting (WHGR, October/November to April) and the animals grazing days per ha (AGD-ha) of CG and SS systems grazed by dairy x beef steers. Three 1.75ha (1.5ha in 2018) plots and three 1.0ha were used for the SS and CG, respectively. Forty-two and 48 autumn born dairy x beef steer calves were split into six equal groups …

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Operational Model Of The Alliance For Grassland Renewal, C. A. Roberts, J. G. Andrae Feb 2024

Operational Model Of The Alliance For Grassland Renewal, C. A. Roberts, J. G. Andrae

IGC Proceedings (1993-2023)

Novel endophyte tall fescue was developed over 20 years ago, and novel endophyte cultivars are among the most innovative cultivars developed in recent decades. Yet adoption of novel endophyte technology is slow. In order to expedite adoption, a diverse group of stakeholders self assembled as the Alliance for Grassland Renewal, a nonprofit organization that includes colleagues from the sectors of industry, university, government, and production. Since 2012, the Alliance has held workshops for producers, educators, and industry across the southeastern US, where tall fescue is the predominant pasture grass. Also since 2012, the Alliance has monitored and reported endophyte purity …

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Economic Value Of Improving Feed Efficiency Of Beef Cows On Pasture, J. T. Biermacher, J. K. Rogers, D. Lalman, A. Holder, R. S. Walker Feb 2024

Economic Value Of Improving Feed Efficiency Of Beef Cows On Pasture, J. T. Biermacher, J. K. Rogers, D. Lalman, A. Holder, R. S. Walker

IGC Proceedings (1993-2023)

Dry matter intake of beef cows is based on a percentage of body weight, so as mature cow size increases, intake increases. Feed efficiency, or the amount of feed required to produce gain or maintain production, has a direct impact to the producer. That is, as mature cow weight increases, yearly maintenance costs increases due to higher feed costs. However, variation in feed efficiency exists within population. Some large cows consume the same or less dry matter as a smaller cow, but produce a larger calf. Conversly, some smaller cows consume the same or more as a large cow but …

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Effects Of Concentrate Supplementation During Summer On Animal Performance And Heat Stress Of Angus Steers Grazing Native Grasslands In Uruguay, P. Rovira, P. Lorenzo Feb 2024

Effects Of Concentrate Supplementation During Summer On Animal Performance And Heat Stress Of Angus Steers Grazing Native Grasslands In Uruguay, P. Rovira, P. Lorenzo

IGC Proceedings (1993-2023)

Research in temperate grasslands has addressed livestock supplementation (SUPL) mainly during winter, but more studies are needed on the impact of SUPL during summer where heat stress (HS) conditions may occur. The objective of this study was to evaluate the effects of summer SUPL on average daily gain (ADG), respiratory rate (RR), and body temperature (BT) of steers grazing native grasslands (60% TDN, 7.3% CP) in Uruguay (33°14'S, 54°15'W). Eighteen 15-month-old Angus steers (285±11 kg) were randomly assigned to 6 groups (2 treatments x 3 replicates) with free access to shade and water on a continuous stocking system (1.5 steer/ha) …

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Bale Grazing To Improve Soil Fertility In Kentucky Pastures, N. Roy, J. W. Lehmkuhler Feb 2024

Bale Grazing To Improve Soil Fertility In Kentucky Pastures, N. Roy, J. W. Lehmkuhler

IGC Proceedings (1993-2023)

A long-term project on a small Kentucky beef farm has demonstrated that bale grazing is an effective means of improving soil fertility. With the cooperation of a beef cattle producer, Extension personnel have been able to measure improvements in soil fertility using both high density and moderate density bale grazing practices. Initial efforts demonstrate that high density bale grazing improved soil fertility quickly by increasing soil test phosphorus from 15 to 45 ppm and potassium from 52 to 175 ppm on Melich III soil test extraction method. High density bale grazing was also shown to serve as a strategy to …

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The Effects Of Grazing Cover Crops On Animal Performance And Soybean Production, J. Brett Rushing, Rocky Lemus, J. G. Maples, J. C. Lyles Feb 2024

The Effects Of Grazing Cover Crops On Animal Performance And Soybean Production, J. Brett Rushing, Rocky Lemus, J. G. Maples, J. C. Lyles

IGC Proceedings (1993-2023)

Grazing cover crops has the potential to offset costs incurred with cover crop establishment, thus incentivizing management adoption. Information regarding cover crop species in combination with grazing and their subsequent effects on soybean production is limited. A field trial was conducted in Newton, MS from 2019 to 2021 to assess these effects. Cover crop treatments included oats (O), O + crimson clover (OC), and OC + radish (OCR) were applied in a randomized complete block design with three replications. Cover crops differed in nutritive analysis; O had significantly lower mean CP, but greater total daily nutrients (TDN). Weaned beef steers …

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