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Articles 11401 - 11430 of 17808
Full-Text Articles in Entire DC Network
Remote Sensing Of Pasture Quality, Reddy R. Pullanagari, Robyn A. Dynes, Warren M. King, Ian Yule, Susanne Thulin, Nichola M. Knox, Abel Ramoelo
Remote Sensing Of Pasture Quality, Reddy R. Pullanagari, Robyn A. Dynes, Warren M. King, Ian Yule, Susanne Thulin, Nichola M. Knox, Abel Ramoelo
IGC Proceedings (1977-2023)
Worldwide, farming systems are undergoing significant changes due to economic, environmental and social drivers. Agribusinesses must increasingly deliver products specified in terms of safety, health and quality. Increasing constraints are being placed on them by the market, the community and by government to achieve a financial benefit within social and environmental limits (Dynes et al. 2003).
In order to meet these goals, producers must know the quantity and quality of the inputs into their feeding systems, be able to reliably predict the products and by-products being generated, and have the skills to be able to manage their business accordingly. …
Infrastructure To Improve Beef Business Outcomes In The Queensland Gulf, Kiri C. Broad, Bernie H. English, Rebecca A. Gunther, Emma S. Hegarty, Joe W. Rolfe, Steven G. Bray
Infrastructure To Improve Beef Business Outcomes In The Queensland Gulf, Kiri C. Broad, Bernie H. English, Rebecca A. Gunther, Emma S. Hegarty, Joe W. Rolfe, Steven G. Bray
IGC Proceedings (1977-2023)
There are significant economic and environmental issues impacting on the short and long term viability of family-run breeding enterprises in the Queensland Gulf. Falling cattle prices and increased business costs threaten the social and financial well-being of many beef producers. Set stocking and overgrazing combine to reduce native 3P (productive, palatable and perennial) grass frequency and herd productivity. The Ryan family on Greenhills Station at George-town in the Queensland Gulf embarked on a 5 year water and fencing infrastructure development program aiming to improve pasture utilisation, land condition and long term carrying capacity.
A Technique For Measurement Of Cattle Form Using A Trail 3d Digital Camera, Tamaki Kida, Shigeki Tejima, Toshitaka Uchino, Fumihiko Tanaka
A Technique For Measurement Of Cattle Form Using A Trail 3d Digital Camera, Tamaki Kida, Shigeki Tejima, Toshitaka Uchino, Fumihiko Tanaka
IGC Proceedings (1977-2023)
Measurement of weight and form are important for the management of grazing cattle; however, form measurement is seldom carried out. Recently, use of 3D digital cameras has been increasing, and 3D-technology for reconstruction of 3D pictures has been developed. The measurement of withers and hip height of cattle from 3D pictures using the image-analysis technique has been reported (Kida et al. 2012). However, time and effort are required to obtain 3D images of grazing cattle in pastures.
Here, we examined an automatic photographic technique using a sensor camera.
Modelling Complex Sheep Systems Using Ausfarm, Susan M. Robertson, Michael A. Friend
Modelling Complex Sheep Systems Using Ausfarm, Susan M. Robertson, Michael A. Friend
IGC Proceedings (1977-2023)
Simulation modelling can be a valuable method for extrapolating experimental findings to different weather or management conditions. However, most of the decision support tools which are available for sheep grazing systems, for example GrassGro® (Donnelly et al. 1997), are limited to modelling of relatively simple sheep management. This makes validation of simulations against experimental results difficult where management changes from year to year, and where more complex sheep management is used. This study evaluated the use of the AusFarm® decision support tool (Moore et al. 2007) to model a split-joined sheep system, using different ram breeds against experimental …
Does Targeted Short-Term Grazing Of Lucerne Increase Twinning Rates In Unsynchronised Merino Ewes?, Jessica M. Rummery, Susan M. Robertson, Belinda J. King, Michael A. Friend
Does Targeted Short-Term Grazing Of Lucerne Increase Twinning Rates In Unsynchronised Merino Ewes?, Jessica M. Rummery, Susan M. Robertson, Belinda J. King, Michael A. Friend
IGC Proceedings (1977-2023)
Reproduction is one of the key profit drivers in the sheep industry and increased reproductive output is needed to address the decline in sheep numbers in Australia to maintain supply to export markets (Curtis 2009). Increased nutrition around mating, or ‘flushing’, is a well-known means of increasing twinning rates. Studies using synchronisation methods have shown that short-term (acute) supplementation can increase prolificacy if targeted at days 9-14 of the oestrous cycle (Stewart and Oldham 1986). However, synchronisation involves increased chemical and labour costs, so may not suit extensive production systems. This study aimed to test whether an increase in twinning …
Evaluating Rangeland's Grazing Capacity For Livestock And Wild Herbivores Using The Delta Diet Tool And Gis Technology, Sandra A. Santos, Arnaud L. J. Desbiez, Humberto L. Perotto-Baldivieso, Juliana M. Alvarez
Evaluating Rangeland's Grazing Capacity For Livestock And Wild Herbivores Using The Delta Diet Tool And Gis Technology, Sandra A. Santos, Arnaud L. J. Desbiez, Humberto L. Perotto-Baldivieso, Juliana M. Alvarez
IGC Proceedings (1977-2023)
Rangelands are dynamic and complex systems requiring appropriate adaptive decision-making to calculate grazing capacity integrating livestock and herbivore wildlife. This work describes the development and application of an integrated framework using the microhistological analysis (DeltaDiet tool) to identify key forage used by different herbivores from the same area associated with GIS technology to mapping landscape containing forage productivity and quality information. This study was conducted in a management unit, representative of the Nhecolândia sub-region landscape, Pantanal. During the dry period, representative fecal samples were collected from cows, capybaras and deer grazing in the same management unit for diet analysis, using …
Glacial Meltwater Modeling To Simulate Lake Water Budget (1996-2013) In Taylor Valley, Antarctica, Julian Michael Cross
Glacial Meltwater Modeling To Simulate Lake Water Budget (1996-2013) In Taylor Valley, Antarctica, Julian Michael Cross
Dissertations and Theses
The McMurdo Dry Valleys (MDV), the largest ice-free region (4,500 km2) in Antarctica, are a polar desert with an average annual temperature of -18ºC. In Taylor Valley, one of the MDV, closed-basin, perennially ice-covered lakes occupy the valley floor. Their water balance is controlled by inflow from glacial meltwater runoff and loss due to sublimation, making them sensitive indicators of climate. In this study, a physically-based model of glacier meltwater and lake ice sublimation is adapted to explain modern (1996 to 2013) lake-level variations. Meltwater model results were improved by the inclusion of MODIS remotely-sensed albedo measurements (E …
Swine Slurry Characteristics As Affected By Selected Additives And Disinfectants, Jon Duerschner, Shannon L. Bartelt-Hunt, Kent Eskridge, John E. Gilley, Xu Li, Amy M. Schmidt, Daniel D. Snow
Swine Slurry Characteristics As Affected By Selected Additives And Disinfectants, Jon Duerschner, Shannon L. Bartelt-Hunt, Kent Eskridge, John E. Gilley, Xu Li, Amy M. Schmidt, Daniel D. Snow
Nebraska Water Center: Faculty Publications
Current swine industry practice is to house animals in confinement facilities which capture and store feces and urine as slurry in pits below the production area. Additives and disinfectants may be introduced into the manure pits. This study was conducted to measure the effects of additives and disinfectants on temporal changes in swine slurry characteristics. Slurry from a commercial swine production facility in southeast Nebraska, USA was collected and transferred to 57 L reactors located within a greenhouse. Selected additives and disinfectants were added to the reactors and physical properties, chemical characteristics, and antibiotic concentrations were monitored for 40 days. …
Feeding Behavior Fundamentally Affects Micro-Particle Intake In Mangrove Crabs, Rola Alsharif
Feeding Behavior Fundamentally Affects Micro-Particle Intake In Mangrove Crabs, Rola Alsharif
Scientific Communication News
No abstract provided.
Human Vs. Bear: Who Needs Salmon More?, Brittany N. Savercool
Human Vs. Bear: Who Needs Salmon More?, Brittany N. Savercool
Scientific Communication News
No abstract provided.
How Corals Avoid Mating Between Different Species, Amanda Kempton
How Corals Avoid Mating Between Different Species, Amanda Kempton
Scientific Communication News
No abstract provided.
Microplastics Invade Manta Ray Feeding Grounds Giving Rise To The Effects Of Global Plastic Pollution, Meghan Ulmer
Microplastics Invade Manta Ray Feeding Grounds Giving Rise To The Effects Of Global Plastic Pollution, Meghan Ulmer
Scientific Communication News
No abstract provided.
Battle For The Top: Killer Whales Vs. White Sharks, Michael P. Mcdonough
Battle For The Top: Killer Whales Vs. White Sharks, Michael P. Mcdonough
Scientific Communication News
No abstract provided.
Can Ocean Modeling Help Predict Where Cold-Stunned Sea Turtles Wash Up?, Mikayla L. Twiss
Can Ocean Modeling Help Predict Where Cold-Stunned Sea Turtles Wash Up?, Mikayla L. Twiss
Scientific Communication News
No abstract provided.
White Sharks As A Novel Threat To Sea Otter Populations In California, Kimberly S. Schmutz
White Sharks As A Novel Threat To Sea Otter Populations In California, Kimberly S. Schmutz
Scientific Communication News
No abstract provided.
Feeding Ecology Of Invasive Lionfish In Southeast Florida, Ruchao Qian
Feeding Ecology Of Invasive Lionfish In Southeast Florida, Ruchao Qian
Scientific Communication News
No abstract provided.
Endangered Whale Species In A Pristine Environment: Pollutant Concentrations Indicative Of A Problem?, Briana R. Coulter
Endangered Whale Species In A Pristine Environment: Pollutant Concentrations Indicative Of A Problem?, Briana R. Coulter
Scientific Communication News
No abstract provided.
No Evidence Of Fine Scale Thermal Adaption In Green Turtles, Taylor Apter
No Evidence Of Fine Scale Thermal Adaption In Green Turtles, Taylor Apter
Scientific Communication News
No abstract provided.
New Intervention Method For Halting Stony Coral Tissue Loss Disease, Samantha Buckley
New Intervention Method For Halting Stony Coral Tissue Loss Disease, Samantha Buckley
Scientific Communication News
No abstract provided.
Machine Learning Provides A Much-Needed Solution For Marine Mammal Protection, Shaman Patel
Machine Learning Provides A Much-Needed Solution For Marine Mammal Protection, Shaman Patel
Scientific Communication News
No abstract provided.
Ghost Fishing In Coral Reef Ecosystems, Katherine E. Meurer
Ghost Fishing In Coral Reef Ecosystems, Katherine E. Meurer
Scientific Communication News
No abstract provided.
Climate Change Could Impact Narwhal Consumption By Killer Whales, Mykenzee L. Munaco
Climate Change Could Impact Narwhal Consumption By Killer Whales, Mykenzee L. Munaco
Scientific Communication News
No abstract provided.
Fishing Industry And Misidentification Leading To Angel Sharks Decline, Gretchen M. Spencer
Fishing Industry And Misidentification Leading To Angel Sharks Decline, Gretchen M. Spencer
Scientific Communication News
No abstract provided.
Flamboyant Cuttlefish: Camouflage Tactics And Colorful Behavior, Shaquilla M. Hamlett
Flamboyant Cuttlefish: Camouflage Tactics And Colorful Behavior, Shaquilla M. Hamlett
Scientific Communication News
No abstract provided.
Distribution Of Polar Bear Dens In The Canadian Arctic, Brice Schrenkel
Distribution Of Polar Bear Dens In The Canadian Arctic, Brice Schrenkel
Scientific Communication News
No abstract provided.
Use Of Multiple Environment Variety Trials Data To Simulate Maize Yields In The Ogallala Aquifer Region: A Two Model Approach, Vaishali Sharda, Mesfin Mekonnen, Chittaranjan Ray, Prasanna H. Gowda
Use Of Multiple Environment Variety Trials Data To Simulate Maize Yields In The Ogallala Aquifer Region: A Two Model Approach, Vaishali Sharda, Mesfin Mekonnen, Chittaranjan Ray, Prasanna H. Gowda
Daugherty Water for Food Global Institute: Faculty Publications
With a long-term goal to optimize use of groundwater in the Ogallala Aquifer Region (OAR) to sustain food production systems, this study was conducted to calibrate Decision Support System for Agrotechnology Transfer (DSSAT) and AquaCrop crop modeling platforms to simulate maize production at a regional scale using historic datasets. Calibration of the models with local crop growth data and crop management practices is important, but usually this in-season crop growth information is not available. This study determined the possibility of using maize variety trial data for the evaluation of the CSM-Crop Estimation through Resources and Environmental Synthesis-Maize and AquaCrop models …
Geochemistry, Risk Assessment, And Pb Isotopic Evidence For Sources Of Heavy Metals Instream Sediments Around The Ulukışla Basin, Niğde, Southern Turkey, Abdurrahman Lermi̇, Emmanuel Daanoba Sunkari
Geochemistry, Risk Assessment, And Pb Isotopic Evidence For Sources Of Heavy Metals Instream Sediments Around The Ulukışla Basin, Niğde, Southern Turkey, Abdurrahman Lermi̇, Emmanuel Daanoba Sunkari
Turkish Journal of Earth Sciences
Concentrations of selected elements (Al, Fe, Mn, Mo, As, Cd, Cu, Cr, Ni, Co, Pb, Sb, and Zn) and Pb isotope ratios were determined in 53 sediments from Alihoca, Gümüş, Horoz, and Çakıt streams around the south-central Taurides (Ulukışla Basin), Niğde, which is a known mining province in Turkey. Several pollution and risk assessment indices were used to assess possible heavy metal pollution in the stream sediments and the associated potential ecological risks. Concentrations of As, Cd, Cu, Cr, Ni, Co, Pb, Sb, and Zn were elevated in the streams located near ancient mines, active mines, and slag piles in …
Upper Paleocene-Lower Eocene Calcareous Nannofossil Stratigraphy At The Misheiti Section, Central Sinai, Egypt, Atef M. Kasem, Sherwood Wise, Mahmoud Faris, Sherif Farouk, Esam Zahran
Upper Paleocene-Lower Eocene Calcareous Nannofossil Stratigraphy At The Misheiti Section, Central Sinai, Egypt, Atef M. Kasem, Sherwood Wise, Mahmoud Faris, Sherif Farouk, Esam Zahran
Turkish Journal of Earth Sciences
Calcareous nannofossil, δ13C, δ18O, and carbonate content data were used to define and reveal the variations across the latest Paleocene-earliest Eocene interval at the Misheiti Section, Central Sinai, Egypt. The upper part of Tarawan Formation, the Esna Formation, and the lowermost Thebes Formation were included in this study. In this study, the Esna Formation is informally divided into Hanadi/Mahmiya and Abu Had members. Four calcareous nannofossil zones (NP9, NP10, NP11, and NP12) and four subzones (NP9a, NP9b, NP10a, and NP10b) were recognized. The biostratigraphic importance of significant calcareous nannofossil bioevents associated with the P/E boundary was discussed. The LOs of …
Traces Of Mediterranean Origin Holocene Transgression In The Drainage Basin Of Riva-Çayağzı Creek Of The Black Sea (Northeastern İstanbul-Turkey), Bülent Doğan, Ahmet Karakaş, Ati̇ke Nazi̇k, İbrahi̇m Engi̇n Meri̇ç
Traces Of Mediterranean Origin Holocene Transgression In The Drainage Basin Of Riva-Çayağzı Creek Of The Black Sea (Northeastern İstanbul-Turkey), Bülent Doğan, Ahmet Karakaş, Ati̇ke Nazi̇k, İbrahi̇m Engi̇n Meri̇ç
Turkish Journal of Earth Sciences
The Riva-Çayağzı Creek (İstanbul, Black Sea) pours into the Black Sea from the coasts of Turkey. In the drainage basin of this creek, both deep and shallow drillings were undertaken, and the minimum thickness of Holocene stratigraphy was determined as 30 m. The Holocene young deposits are mainly composed of fine-grained sediments and clay, which has the most prominent thickness. The energy of water during the sedimentation process was low and stagnant in the Riva-Çayağzı Creek basin. When the marine mollusc fossils obtained from the shallow boring cores are evaluated, it can be deduced that the sea level in the …
Hydrogeology And Geology Of The Lower North And South Platte Rivers Of Nebraska: Nebraska Geological Society Field Trip 2020, Douglas R. Hallum, Paul R. Hanson, Shane Tucker, Robert F. Diffendal Jr.
Hydrogeology And Geology Of The Lower North And South Platte Rivers Of Nebraska: Nebraska Geological Society Field Trip 2020, Douglas R. Hallum, Paul R. Hanson, Shane Tucker, Robert F. Diffendal Jr.
Robert F. Diffendal, Jr., Publications
The 2020 Nebraska Geological Society field trip will visit central Nebraska, and explore the geology and hydrogeology of the upper Platte, Lower South Platte and Lower North Platte rivers. The field trip area consists of a roughly east-west strip of land, approximately 100 kilometers long, and generally less than 10 kilometers north and south of the Platte, North Platte and South Platte rivers’ channels over most of the reach; from Brady, NE, upstream to Big Springs on the South Platte River and Lewellen on the North Platte River (Map 1). In addition to the river valleys, participants will observe alluvial …