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Articles 391 - 420 of 12200
Full-Text Articles in Entire DC Network
Rrad-Reduction Reveals Efficacy Of Targeting L-Type Calcium Channel Regulation For Treatment Of Heart Failure, Garrett Elmore, Sarisha S. Lohano, Nicholas M. Mcvay, Bryana M. Levitan, Andrea Sebastian, Kyle W. Barker, Alec Dupont, Steven W. Leung, Riham R.E. Abouleisa, Pretty R. Mathew, Austin Wellette-Hunsucker, Austin T. Minton, Kenneth S. Campbell, Solomon W. Harrar, Mohammad Mehri, Jonathan F. Wenk, Tamer M.A. Mohamed, Douglas A. Andres, Jonathan Satin
Rrad-Reduction Reveals Efficacy Of Targeting L-Type Calcium Channel Regulation For Treatment Of Heart Failure, Garrett Elmore, Sarisha S. Lohano, Nicholas M. Mcvay, Bryana M. Levitan, Andrea Sebastian, Kyle W. Barker, Alec Dupont, Steven W. Leung, Riham R.E. Abouleisa, Pretty R. Mathew, Austin Wellette-Hunsucker, Austin T. Minton, Kenneth S. Campbell, Solomon W. Harrar, Mohammad Mehri, Jonathan F. Wenk, Tamer M.A. Mohamed, Douglas A. Andres, Jonathan Satin
Surgery Faculty Publications
Aims Heart failure with reduced ejection fraction (HFrEF) is a major health problem. Increasing L-type calcium channel (LTCC) activity deteriorates heart function; however, myocardial RRAD knockout (cRADΔ/Δ) instills tonic modulated LTCC current (ICa,L) that preserves healthy myocardium. Thus, we chose to challenge the dogma that enhanced trigger Ca2+ is maladaptive. The study objective was to test the hypothesis that modulated ICa,L in cRADΔ/Δ mice rescues dilated cardiomyopathy by providing tonic modulated trigger Ca2+. Methods and results Mouse and human models were tested. The muscle lim protein knockout mouse (MLPKO) is a murine model of dilated cardiomyopathy (DCM) and HFrEF. The …
An Animal Interest Approach Method As A Gateway To A One Health Educated Pipeline, Meghan C. Wulster-Radcliffe, Sarah A. Reed, James N. Macleod, Rebekah B. Epps, J. Scott Radcliffe, Robert J. Coleman, Steven A. Zinn
An Animal Interest Approach Method As A Gateway To A One Health Educated Pipeline, Meghan C. Wulster-Radcliffe, Sarah A. Reed, James N. Macleod, Rebekah B. Epps, J. Scott Radcliffe, Robert J. Coleman, Steven A. Zinn
Animal and Food Sciences Faculty Publications
No abstract provided.
Thermoneutrality Does Not Affect Angiotensin Ii–Induced Aortic Aneurysms In Hypercholesterolemic Mice, Liyuan Zhu, Bowen Li, Michael K. Franklin, Deborah A. Howatt, Yuriko Katsumata, Alan Daugherty, Hong S. Lu
Thermoneutrality Does Not Affect Angiotensin Ii–Induced Aortic Aneurysms In Hypercholesterolemic Mice, Liyuan Zhu, Bowen Li, Michael K. Franklin, Deborah A. Howatt, Yuriko Katsumata, Alan Daugherty, Hong S. Lu
Physiology Faculty Publications
No abstract provided.
The First Complete Assembly For A Lungless Urodelan With A “Miniaturized” Genome, The Northern Dusky Salamander (Plethodontidae: Desmognathus Fuscus), Edward A. Myers, Alexander A. Stewart, Aidan E. O’Brien, Jeramiah J. Smith, R. Alexander Pyron
The First Complete Assembly For A Lungless Urodelan With A “Miniaturized” Genome, The Northern Dusky Salamander (Plethodontidae: Desmognathus Fuscus), Edward A. Myers, Alexander A. Stewart, Aidan E. O’Brien, Jeramiah J. Smith, R. Alexander Pyron
Biology Faculty Publications
Salamanders have some of the largest genomes among animals, driven primarily by expansion of repeat elements and slow rates of DNA loss. However, species in the lungless genus Desmognathus (Plethodontidae) have some of the smallest genomes at ∼13 to 15 GB, though previous sequencing attempts with short-read assemblies were still fragmentary. Here, we assemble an annotated draft genome of Desmognathus fuscus using PacBio HiFi reads and transcriptomic data from 2 specimens from the same population. The combined dataset resulted in a 16.1 GB assembly in 19,632 contigs and an L/N50 of 2,459/1.74 MB, with the longest contig at 27.9 MB. …
Kentucky Model Minimum Uniform Crash Criteria (Mmucc) Sixth Edition Report Card, William Staats, Nikiforos Stamatiadis, Eric Green, Nathaniel Swallom
Kentucky Model Minimum Uniform Crash Criteria (Mmucc) Sixth Edition Report Card, William Staats, Nikiforos Stamatiadis, Eric Green, Nathaniel Swallom
Kentucky Transportation Center Research Report
The National Highway Traffic Safety Administration published the Model Minimum Uniform Crash Criteria (6th Edition) (MMUCC) in 2024. This updated version of the MMUCC contains recommendations for improving and standardizing electronic crash data. Its guidelines address the collection and presentation of 105 data elements and 1,056 data attributes. To facilitate a possible redesign of Kentucky’s crash reporting process, Kentucky Transportation Center (KTC) researchers reviewed the updated criteria and evaluated the degree to which the state complies with its recommended methods of gathering, storing, and presenting crash data. At the level of data elements, Kentucky is 25 percent compliant; for data …
Kentucky Traffic Collision Facts Calendar Year 2024 Report, Paul Ross, Eric Green, Christopher Blackden, Kenneth Agent, Christopher Van Dyke
Kentucky Traffic Collision Facts Calendar Year 2024 Report, Paul Ross, Eric Green, Christopher Blackden, Kenneth Agent, Christopher Van Dyke
Kentucky Transportation Center Research Report
No abstract provided.
Satellite Cells Choreograph An Immune Cell-Fibrogenic Cell Circuit During Mechanical Loading In Geriatric Skeletal Muscle, Nicholas T. Thomas, Camille R. Brightwell, Allison M. Owen, Alexander R. Keeble, Sabin Khadgi, Yuan Wen, Christopher S. Fry, Kevin A. Murach
Satellite Cells Choreograph An Immune Cell-Fibrogenic Cell Circuit During Mechanical Loading In Geriatric Skeletal Muscle, Nicholas T. Thomas, Camille R. Brightwell, Allison M. Owen, Alexander R. Keeble, Sabin Khadgi, Yuan Wen, Christopher S. Fry, Kevin A. Murach
Physiology Faculty Publications
Muscle stem cells, or satellite cells (SCs), decline in number throughout the lifespan and may become senescent in very old age. Whether and how remaining SCs contribute to muscle adaptation in the oldest-old is unclear. Using acute mechanical overload in geriatric SC replete and depleted mice (28-month-old) combined with single-cell RNA-sequencing, we show: (i) subsets of geriatric SCs display signs of senescence as well as normal fate progression during overload, (ii) SCs express markers that may contribute to the regulation of innervation, (iii) the presence of SCs during overload enhances global intercellular communication and increases mRNA levels of the cell …
Noncontact Diffuse Optical Imaging Of Blood Flow And Oxygenation Distributions In Reconstructive Rat Skin Flaps, Samaneh Rabienia Haratbar, Fatemeh Hamedi, Mehrana Mohtasebi, Faraneh Fathi, Faezeh Akbari, Dara Singh, L. I.U. Xuhui, Li Chen, Lesley Wong, Lei Chen, Guoqiang Yu
Noncontact Diffuse Optical Imaging Of Blood Flow And Oxygenation Distributions In Reconstructive Rat Skin Flaps, Samaneh Rabienia Haratbar, Fatemeh Hamedi, Mehrana Mohtasebi, Faraneh Fathi, Faezeh Akbari, Dara Singh, L. I.U. Xuhui, Li Chen, Lesley Wong, Lei Chen, Guoqiang Yu
Surgery Faculty Publications
Perioperative identification of ischemic-hypoxic tissue is essential for reducing the risk of mastectomy skin flap necrosis (MSFN), a major complication following mastectomy. Implant-based breast reconstruction is jeopardized in the presence of MSFN. However, existing technologies are limited by depth insensitivity, dye-related risks, the need for contact sensors, and an inability to simultaneously assess both blood flow and oxygenation. A multi-wavelength speckle contrast diffuse correlation tomography (MW-scDCT) system was developed for noncontact, dye-free, and depth-sensitive imaging of tissue hemodynamics in a rat model incorporating four distinct flap scenarios: sham (SH), implant (IM), half necrosis (HN), and full necrosis (FN), representing varying …
Identification Of Metabolic Pathways And Hub Genes Associated With Ultrasound Subcutaneous Fat And Muscle Depth Of The Longissimus Muscle In Cull Beef Cows Using Gene Co-Expression Analysis, Harshraj Shinde, Kyle R. Mcleod, Jeffrey W. Lehmkuhler
Identification Of Metabolic Pathways And Hub Genes Associated With Ultrasound Subcutaneous Fat And Muscle Depth Of The Longissimus Muscle In Cull Beef Cows Using Gene Co-Expression Analysis, Harshraj Shinde, Kyle R. Mcleod, Jeffrey W. Lehmkuhler
Animal and Food Sciences Faculty Publications
Beef production is an important component of the world’s food supply, with production being near 59 million tons in 2023 (USDA, 2023). Enhancing our understanding of the factors influencing metabolism will lead to improvements in production efficiency. Using RNA-seq and WGCNA of longissimus muscle samples, gene expression and metabolic pathway analyses were performed to examine relationships with ultrasound and body mass variables. In this study, body weight (BW), ultrasound back fat (BF), ultrasound muscle depth (MD), and body condition score (BCS) were traits recorded for 18 cull beef cows. As expected, all production-related traits monitored (WT, BF, MD, and BCS) …
Danicamtiv Reduces Myosin’S Working Stroke But Activates The Thin Filament By Accelerating Actomyosin Attachment, Brent Scott, Lina Greenberg, Caterina Squarci, Kenneth S. Campbell, Michael J. Greenberg
Danicamtiv Reduces Myosin’S Working Stroke But Activates The Thin Filament By Accelerating Actomyosin Attachment, Brent Scott, Lina Greenberg, Caterina Squarci, Kenneth S. Campbell, Michael J. Greenberg
Physiology Faculty Publications
Heart failure is a leading cause of death worldwide, and even with current treatments, the 5-y transplant-free survival rate is only ~50 to 70%. As such, there is a need to develop new treatments for patients that improve survival and quality of life. Recently, there have been efforts to develop small molecules for heart failure that directly target components of the sarcomere, including cardiac myosin. Danicamtiv is one of these molecules; however, its direct effects on myosin’s single molecule mechanics and kinetics are not well understood. Using optical trapping techniques, stopped flow transient kinetics, and in vitro reconstitution assays, we …
Dynamic Remodeling Of Centrioles And The Microtubule Cytoskeleton In The Lifecycle Of Chytrid Fungi, Alexandra F Long, Krishnakumar Vasudevan, Andrew Swafford, Claire M Venard, Jason E Stajich, Lillian K Fritz-Laylin, Jessica L Feldman, Tim Stearns
Dynamic Remodeling Of Centrioles And The Microtubule Cytoskeleton In The Lifecycle Of Chytrid Fungi, Alexandra F Long, Krishnakumar Vasudevan, Andrew Swafford, Claire M Venard, Jason E Stajich, Lillian K Fritz-Laylin, Jessica L Feldman, Tim Stearns
Biology Faculty Publications
Cell movement and division are complex behaviors driven by a dynamic internal cytoskeleton. The molecular components and principles of cytoskeletal assembly are well studied, but less is known about cytoskeletal remodeling events, including how centrioles transition from ciliary base to centrosome. Here we address this using the chytrid Rhizoclosmatium globosum, a zoosporic fungus which has centrioles and cilia, lost in most fungal lineages. Chytrids undergo reorganization of their microtubule cytoskeleton as they grow from zoospore to multinucleated coenocyte. We use evolutionary comparison, RNA sequencing, and expansion microscopy to understand this reorganization and further develop this organism as a model for …
“Literally Made Me Cry”: The Impact Of Course Material Costs On University Of Kentucky Students, Stephen Krueger
“Literally Made Me Cry”: The Impact Of Course Material Costs On University Of Kentucky Students, Stephen Krueger
Library Reports and White Papers
The Student Course Materials Cost Survey was administered September 16 – October 6, 2024. It was open to current students at the University of Kentucky (UK). The goals were to help UK Libraries better understand how the cost of course materials affects students at UK and to provide a snapshot of student spending across the university. The questions were based on similar research done at other institutions in Virginia (Virginia Course Materials Survey, 2021) and Florida (2022 Student Textbook and Instructional Materials Survey, 2022). Other work based on those surveys includes the 2023 Illinois Course Materials Survey (CARLI, 2023) and …
The Effects Of Overexpressing K2p Channels In Various Tissues On Physiology And Behaviors, Alaina C. Taul, Elizabeth R. Elliott, Douglas A. Harrison, Robin L. Cooper
The Effects Of Overexpressing K2p Channels In Various Tissues On Physiology And Behaviors, Alaina C. Taul, Elizabeth R. Elliott, Douglas A. Harrison, Robin L. Cooper
Biology Faculty Publications
Two-pore-domain K+ channels (K2p), known previously as leak channels, are responsible for maintaining the resting membrane potential of cells. Fifteen subtypes are known to exist in humans and eleven are known in Drosophila melanogaster, as well as six subfamilies; however, little is known about the expression of these subtypes in various animal tissues or the impact of altered expression on cellular physiology. The Drosophila melanogaster model allows for selective misexpression of certain neuron subsets, providing insight into individual cell types and the animal’s physiology more generally. Prior research on the overexpression of K2p channels and the resulting behavioral and …
Proto-Oncogene Hras Transcript Level And Overall Survival In Stages Ii And Iii Colorectal Cancer, Donghyun Kim, Saima Sharif, Juan Antonio Raygoza Garay, Avanish S. Bhakta, Patrick M. Boland, Michael J. Cavnar, Michelle L. Churchman, Hassan Hatoum, Lyen C. Huang, Joseph Kim, Richard Kim, Robert W. Lentz, Sarbajit Mukherjee, Mary T. O'Donnell, Benjamin Quartey, Matthew J. Reilley, Robert J. Rounbehler, Bodour Salhia, Bryan P. Schneider, Carlos H. Chan
Proto-Oncogene Hras Transcript Level And Overall Survival In Stages Ii And Iii Colorectal Cancer, Donghyun Kim, Saima Sharif, Juan Antonio Raygoza Garay, Avanish S. Bhakta, Patrick M. Boland, Michael J. Cavnar, Michelle L. Churchman, Hassan Hatoum, Lyen C. Huang, Joseph Kim, Richard Kim, Robert W. Lentz, Sarbajit Mukherjee, Mary T. O'Donnell, Benjamin Quartey, Matthew J. Reilley, Robert J. Rounbehler, Bodour Salhia, Bryan P. Schneider, Carlos H. Chan
Surgery Faculty Publications
Background: Mutational landscape is prognostic in colorectal cancer (CRC). Rat sarcoma (RAS) oncogenes, such as KRAS and NRAS, with driver mutations, portend poor survival outcomes, whereas pathologic mutations in HRAS are extremely rare, and their prognostic value remains uncertain. Methods: This retrospective study analyzed the Oncology Research Information Exchange Network (ORIEN) alliance tumor RNA-Seq data in Stages II and III CRC to investigate the association between RAS gene expression and survival outcomes. Results: High transcript levels of HRAS were associated with superior overall survival (OS). The high HRAS-associated OS benefit was most pronounced in patients with right-sided primary expressing low …
The Effect Of Cellulolytic Enzyme Preparations As In Vitro Improvement For Forage Digestibility, G Bertin, Ph Hellings
The Effect Of Cellulolytic Enzyme Preparations As In Vitro Improvement For Forage Digestibility, G Bertin, Ph Hellings
IGC Proceedings (1977-2023)
The systematic study of commercial preparations of fungal cellulases has been undertaken with the aim of determining the principal components and the contribution of each to the digestion of the plant cell wall. These enzymes, normally have three fold role-silage preservative by hydrolysing the cellulosic wall of plant material, cellulases make available fermentable sugars to the lactic bacteria. -Improvement of digestibility we can increase gain by 1 % of the dry matter in forage. - Improvement of intake if the animal digests more quickly his gut will empty more rapidly thus making it available sooner for a new intake of …
Effect Of Contamination By Aspergillus Flavus On The Nutritive Value Of Leaf Protein Concentrate Of Leucaena Leucocphala During Storage, H T. Ostrowski-Meissner, I Komang, W Supratman, I Barchia, S Cacang
Effect Of Contamination By Aspergillus Flavus On The Nutritive Value Of Leaf Protein Concentrate Of Leucaena Leucocphala During Storage, H T. Ostrowski-Meissner, I Komang, W Supratman, I Barchia, S Cacang
IGC Proceedings (1977-2023)
Leaf protein concentrate extracted from tree legume Leucaena leucocephala cultivar Cunningham (LLP) was stored under humid tropical conditions (24-28°C and 84-92% rh) in the form of wet cake during a 10 day period. Samples of LLP were taken every second day for chemical analyses and protein quality assays. The effect of storage on dried LLP was also assessed against two control proteins: peanut meal (PNM) and fish meal (FM), either free of aflatoxins or infected by the aflatoxigenic fungus Aspergi_llus flavus to the level 280 mcg aflatoxin B1 equivalent/kg. Storage of wet LLP under such conditions resulted in infestation by …
Effect Of Stage Growth And Chopping Length On Ensiling Characteristics, Digestibility And Palatability Of Guinea-'A', S Panditharatne, J P. Fontenot, V G. Allen, M.C N. Jayasuriya
Effect Of Stage Growth And Chopping Length On Ensiling Characteristics, Digestibility And Palatability Of Guinea-'A', S Panditharatne, J P. Fontenot, V G. Allen, M.C N. Jayasuriya
IGC Proceedings (1977-2023)
Ensiling of forages is a common practice in temperate areas, but is not used extensively in tropical countries. Preservation of excess forage during rainy seasons would provide a more even distribution of feed during the year. Experiments were conducted to investigate fermentation characteristics, and digestibility and palatability of Guinea-'A' (Panicum maximum, ecotype A) silage by sheep. Guinea-'A' grass was harvested after 2- and 3-week growth periods, and ensiled chopped or unchopped in 210 liter metal drums, double lined with polyethylene. Cutting grass at 2 weeks decreased pH and increased lactic acid of silage, compared to cutting at 3 weeks. Chopping …
The Use Of Microbiological Processes In The Fractioning Of Plant Green Mass, M J. Beker, A A. Klintsare, D J. Upite, V E. Ramnietse, V F. Bekere, R Carlsson
The Use Of Microbiological Processes In The Fractioning Of Plant Green Mass, M J. Beker, A A. Klintsare, D J. Upite, V E. Ramnietse, V F. Bekere, R Carlsson
IGC Proceedings (1977-2023)
The work discusses anaerobic fermentation of juice and press cakes of plant green mass in order to obtain stabilized feeds upon minimum energy expenses. We have studied the conversion of carbohydrates into acids, protein coagulation and proteolysis. There has been constructed a new technology "TPF-1". The work deals also with the stability and biological effectivity of the fermented juice and coagulate. Zootechnical experiments on pigs, calves, bull-calves established that a stabilized juice or coagulate can replace upto 30-40% of protein in traditional ratios without a decrease in animal productivity. It was established that, in order to ensure complete wastelessness and …
Predicting In Vitro Digestibility With A Simple Potent Cellulase Procedure, S S. Bughrara, D A. Sleper, O H. Calvert, G C. Marten
Predicting In Vitro Digestibility With A Simple Potent Cellulase Procedure, S S. Bughrara, D A. Sleper, O H. Calvert, G C. Marten
IGC Proceedings (1977-2023)
Reliable, inexpensive and rapid methods of determing in vitro dry matter digestibility (DMD) are necessary to evalute animal production potential of a given herbage. The objective of this research was to determine the relationship between DMD measured by a procedure using a potent cellulase solution (from Trichoderma reese1) and by a procedure using rumen liquor. Herbage from 22 species was assayed. Correlations between in vitro DMD determined by the cellulase procedure and rumen liquor procedure ranged from 0.24 to 0.99. Most correlations were highly significant and greater than 0.95. Regression coefficients ranged from 0.26 to 1.43. The cellulase procedure was …
Development Of A Conductivity Transducing Cannula For Measuring Forage Intake Of Grazing Livestock, J R. Forwood
Development Of A Conductivity Transducing Cannula For Measuring Forage Intake Of Grazing Livestock, J R. Forwood
IGC Proceedings (1977-2023)
The quantity of forage consumed over a given time by livestock is an extremely important measurement of the quality of that forage. Intake differences may reflect differences in palatability, digestibility, forage chemical composition, rate of passage and overall animal performance. Although forage intake is a critical measurement, much more emphasis has been placed on improving parameters such as forage yield, persistence, and winter hardiness. One reason for this is that the above parameters can be measured with accuracy and relative ease while forage intake measurement of grazing livestock is difficult, expensive and often-times inaccurate. In an attempt to directly and …
Effect Of Bent Grass (Agrostis Tenuis) On The Growth And Wool Production Of Sheep In South East Australia, M E. Boyd
IGC Proceedings (1977-2023)
An experiment determined the effect of infestation by bent grass on the productivity of pastures grazed by sheep in Victoria. The 5-year study of liveweights and wool production from sheep grazing bent grass and treated pasture demonstrated that the presence of bent grass can reduce the productivity from sheep grazing such pastures by up to 63%. Thorough, shallow cultivation (5-7 cm deep) during summer, followed by resowing of more desirable species, produced the greatest increase in animal production. The average wool production/head of wethers grazed at 8.6/hectare on pasture dominated by bent grass was the same as that of sheep …
Research On The Grassland Ecosystem In Inner Mongolia Of China And The Strategy Of Utilization, Shu Jiang
Research On The Grassland Ecosystem In Inner Mongolia Of China And The Strategy Of Utilization, Shu Jiang
IGC Proceedings (1977-2023)
The strategy on grassland utilization based on regional vegetation investigation and longterm ecosystem research in the middle part of Innermongolia is described. Although there are some potential capacity for increasing livestock number by the estimation of the primary productivity measurement and some investigation data, but practically, the pasture in some places has been degraded even desertified caused by unreasonable utilization of overgrazing and agricultural cultivations. Therefore on the strategy, to transform the structure both of pastoral and rural area in lnnermongolia would be necessary, i.e. to introduce some means of plantation for artificial range establishing at some limited azonal places. …
Herbage And Animal Production Of A Short Grass Pasture In A Mountainous Region Of Japan, M Fukuyama, M Shimamura, M Ushiyama, T Imura
Herbage And Animal Production Of A Short Grass Pasture In A Mountainous Region Of Japan, M Fukuyama, M Shimamura, M Ushiyama, T Imura
IGC Proceedings (1977-2023)
Herbage and animal production of a short grass pasture established by unplowed sowing were investigated for seven years under continuous grazing. Herbage production and consumption on the pasture were estimated by using cages. Moreover, light intensity was measured with the new portable solarimeter devised by the authors for pastures. Standing crop was kept at 200-300 g dry matter (DM)/m2 throughout the grazing season, 32-78% of which was below 3 cm from the ground surface. From these results, it was found that the standing crop scarecely fluctuate seasonally and considerable herbage mass existed under the lower layer near the ground. Furthermore, …
The Mountain Grassland Category And Its Ecological Succession Of The Greater Xing'an Mountains, Wei Shaocheng, Zhu Tingcheng
The Mountain Grassland Category And Its Ecological Succession Of The Greater Xing'an Mountains, Wei Shaocheng, Zhu Tingcheng
IGC Proceedings (1977-2023)
The mountain grassland of the Greater Xing'an Mountains are divided into two sorts, nine groups, fifteen types. It is suggested that mountain grasslands are sub-climax for its character of the climate and artificial succession. This classification and the rules of community dynamics will help us to know the grasslands of this area systematically. It will provide a scientific basis for the rational exploiting and utilizing the resources of the forest and grasslands, and determining the way of the agricultural production on it.
The Energy Intake And Its Dynamic In Alpine Grassland - Sheep Systems, Wang Qin
The Energy Intake And Its Dynamic In Alpine Grassland - Sheep Systems, Wang Qin
IGC Proceedings (1977-2023)
The experiment was carried out on alpine grassland, from 1978 to 1979, in Tianzhu Tibetan Autonomous County, Gansu Province. Local Tibetan sheep were used as the experiment animals.
Ecology And Productive Potential Of Chusquea Genus (Bambusoideae) In Chilean Southern Humid Ecosystems, V E. Riveros, P Tellez, M Iwamoto
Ecology And Productive Potential Of Chusquea Genus (Bambusoideae) In Chilean Southern Humid Ecosystems, V E. Riveros, P Tellez, M Iwamoto
IGC Proceedings (1977-2023)
In a southern Chilean humid ecosystem, the productive potentiality of Chusquea coleu and Ch. quila was studied for animal utilization. During 2 years was seasonally recorded crude protein, neutro detergent fibre and dry matter in vitro digestibility. Also was analized the production of leaves and sprigs, and culms (utilizable and not by livestock, respectively). It was recorded a remarkable seasonality in dry matter production as well as in quality charateristics in both species. Results let conclude that both species could be an interesting animal feed resource specially in seasons in which the pasture is in a critical stage of growth, …
Models For Short Term Prediction Of Grazing Grassland Productivity: Population Model Vs. Ecosystem Model, M Shiyomi, N Koyama, M Tsuiki
Models For Short Term Prediction Of Grazing Grassland Productivity: Population Model Vs. Ecosystem Model, M Shiyomi, N Koyama, M Tsuiki
IGC Proceedings (1977-2023)
Ecosystem models to analyse energy and matter flows in Japanese grazing grassland have been developed during the past 10 years. These models have contributed much to ecosystem studies but they are not suitable, from the farmers' viewpoint, for predicting grassland productivity for two reasons: (1) as they have generally large and complex structures, they do not fit individual farmers' small personal computers; and (2) they contain so many variables that farmers cannot measure precise values of all of them in their fields. In this paper, we propose six small simple population models for describing plant and animal growth which can …
Energy Conversion Efficiencies In Grazing Grassland At Different Stocking Rates, S Takahashi, M Shiyomi, T Akiyama, T Okubo
Energy Conversion Efficiencies In Grazing Grassland At Different Stocking Rates, S Takahashi, M Shiyomi, T Akiyama, T Okubo
IGC Proceedings (1977-2023)
The effect of stocking rates on the energy conversion efficiency was examined on a grazing pasture over an eight year period from 1974. Annual stocking rates were in the range of 117-523 animal-unit days (AUD)/ha over eight years. Photosynthetically active radiation, net primary production by herbage plants and the amounts consumed by grazing cattle were measured during the plant growing season (from late March to late November). For estimations of stored energy in cattle, ARC feeding standards (1965) using the daily increment for body weight were adopted. Energy conversion efficiencies from solar energy through plants and animals were calculated as …
Energy Flow Through Cell Wall And Cellular Contents Of Plants On Grazing Pasture, N Koyama, M Tsuiki, M Shiyomi
Energy Flow Through Cell Wall And Cellular Contents Of Plants On Grazing Pasture, N Koyama, M Tsuiki, M Shiyomi
IGC Proceedings (1977-2023)
Energy flow from sun to grazing animals, especially the functions of cellular contents (CC) and cell wall (CW) in this regard, was examined at the Fujinita Experimental Grazing Pasture of the National Grassland Research Institute, Tochigi which is situated at 36 °55'N and 136 °58 E, with a mean annual air-temperature of 12.3 °C and mean annual rainfall 1631 mm. Grazing experiments were conducted under two different nitrogen application regimes in 1983 and 1984. The net primary production was 53 and 33 Mkcal/ha/yr for plot of high (HN) and low (LN) nitrogen applications, respectively. Dry matter of the standing crop …
The Species Composition Index: A Tool For Explaining Variability In Steer Grazing Experiments, Henry A. Fribourg, J B. Mclaren
The Species Composition Index: A Tool For Explaining Variability In Steer Grazing Experiments, Henry A. Fribourg, J B. Mclaren
IGC Proceedings (1977-2023)
Forage growth and consumption, and animal performance were estimated in two beef steer (Bos sp.) backgrounding experiments concurrently with several environmental, plant, and animal characteristics. This paper describes, evaluates and validates a technique that combines the dynamic changes in species composition of grass-legume pastures over time into a Species Composition Index (SCI). This index then can be related to the effects of year, season, grazing pressure, forage quality, precipitation, and air temperature on forage growth and consumption, and animal performance. The SCI was compared to the traditional classification variable 'treatment' to describe seven different pasture conbinations of forage species for …