Factors affect the performance and carcass characteristics of finishing grazed cattle within a 20 month beef system

1988 ◽  
Vol 1988 ◽  
pp. 59-59
Author(s):  
B.G. Lowman ◽  
C.E. Hinks ◽  
C. Swift ◽  
D.R. Neilson ◽  
E.A. Hunter
Keyword(s):  
Production Systems ◽  
Carcass Characteristics ◽  
Scientific Data ◽  
Eating Quality ◽  
Short Term ◽  
Grazing Season ◽  
Objective Information ◽  
Rates Of Change

The increasing sales of beef through retail supermarket outlets has been reflected in specification buying by wholesalers being more apparent. The objective of supermarket buyers is to obtain continuity of supplies throughout the year and this trend is likely to increase. Faced with these requirements producers of grass finished cattle (representing 40 per cent of beef supplies) have little objective information on which to plan their production systems. The limited scientific data available tends to be short-term with little, if any, information available on eventual carcass and eating quality.A long-term project has therefore been initiated at Edinburgh to examine the effects of production variables on the performance and carcass characteristics of grass-finished cattle within a 20 month beef system. One aspect of this work has centred its attention on providing information on the rates of change (with time) of carcass characteristics, during the grazing season, in relation to breed, sex and variation in grass availability.

Modeling cell volume regulation in nonexcitable cells: the roles of the Na+ pump and of cotransport systems

1998 ◽  
Vol 275 (4) ◽  
pp. C1067-C1080 ◽  
Author(s):  
Julio A. Hernández ◽  
Ernesto Cristina
Keyword(s):  
Cell Volume ◽  
Volume Regulation ◽  
Present Model ◽  
Animal Cell ◽  
Cell Volume Regulation ◽  
Kinetic Scheme ◽  
Short Term ◽  
Rates Of Change

The purpose of this study is to contribute to understanding the role of Na+-K+-ATPase and of ionic cotransporters in the regulation of cell volume, by employing a model that describes the rates of change of the intracellular concentrations of Na+, K+, and Cl−, of the cell volume, and of the membrane potential. In most previous models of dynamic cellular phenomena, Na+-K+-ATPase is incorporated via phenomenological formulations; the enzyme is incorporated here via an explicit kinetic scheme. Another feature of the present model is the capability to perform short-term cell volume regulation mediated by cotransporters of KCl and NaCl. The model is employed to perform numerical simulations for a “typical” nonpolarized animal cell. Basically, the results are consistent with the view that the Na+ pump mainly plays a long-term role in the maintenance of the electrochemical gradients of Na+ and K+ and that short-term cell volume regulation is achieved via passive transport, exemplified in this case by the cotransport of KCl and NaCl.

scholarly journals Technical note: On comparing greenhouse gas emission metrics

2021 ◽  
Vol 21 (6) ◽  
pp. 4699-4708
Author(s):  
Ian Enting ◽  
Nathan Clisby
Keyword(s):  
Global Warming ◽  
Greenhouse Gas ◽  
Global Warming Potential ◽  
Radiative Forcing ◽  
Greenhouse Gas Emission ◽  
Technical Note ◽  
Short Term ◽  
Rates Of Change

Abstract. Many metrics for comparing greenhouse gas emissions can be expressed as an instantaneous global warming potential multiplied by the ratio of airborne fractions calculated in various ways. The forcing equivalent index (FEI) provides a specification for equal radiative forcing at all times at the expense of generally precluding point-by-point equivalence over time. The FEI can be expressed in terms of asymptotic airborne fractions for exponentially growing emissions. This provides a reference against which other metrics can be compared. Four other equivalence metrics are evaluated in terms of how closely they match the timescale dependence of FEI, with methane referenced to carbon dioxide used as an example. The 100-year global warming potential overestimates the long-term role of methane, while metrics based on rates of change overestimate the short-term contribution. A recently proposed metric based on differences between methane emissions 20 years apart provides a good compromise. Analysis of the timescale dependence of metrics expressed as Laplace transforms leads to an alternative metric that gives closer agreement with FEI at the expense of considering methane over longer time periods. The short-term behaviour, which is important when metrics are used for emissions trading, is illustrated with simple examples for the four metrics.

scholarly journals Grapevine Cultivars, Trellis Systems, and Mechanization of the California Raisin Industry

2014 ◽  
Vol 24 (3) ◽  
pp. 285-289 ◽  
Author(s):  
Matthew W. Fidelibus
Keyword(s):  
Production Systems ◽  
The United States ◽  
Medium Term ◽  
Thompson Seedless ◽  
Short Term ◽  
Breeding Programs ◽  
Early Ripening ◽  
Ct System ◽  
Made In

Growers in California’s San Joaquin Valley produced >25% of the world’s raisins in 2012, with a farm-gate value of >$590 million, making the United States the leading global producer of raisins. California’s traditional raisin-making method is a laborious process in which clusters of grapes (Vitis vinifera) are harvested by hand onto paper trays, which are left in the vineyard to dry. The drying fruit may need to be turned or rolled, tasks requiring manual labor, and the trays of dried raisins are also picked up by hand. Most California raisins continue to be made in this way, but in recent years, the declining availability and increasing cost of labor has prompted many growers to implement one of two mechanized production systems, “continuous tray” (CT) or “dry-on-vine” (DOV). In CT systems, machines are used to pick the berries, lay them onto a tray, and pick up the dried raisins. The CT system could be considered a short-term strategy: it is compatible with existing conventional ‘Thompson Seedless’ raisin vineyards and has been widely adopted. The DOV system could be considered a medium-term strategy: it is best suited for vineyards specifically designed for DOV, with early ripening grapevine cultivars on expansive trellis systems, which ensures timely drying, and capitalizes on the fact that sunlit row middles are not needed for fruit drying. Grapevine breeding programs are currently working toward the development of raisin grape cultivars with fruitful basal nodes, with fruit that dry naturally upon ripening. This is a long-term strategy to further reduce labor needs by enabling mechanical pruning in winter and eliminating the need for cane severance in the summer.

scholarly journals Double Star project - master science operations plan

2005 ◽  
Vol 23 (8) ◽  
pp. 2851-2859 ◽  
Author(s):  
C. Shen ◽  
Z. Liu
Keyword(s):  
Service System ◽  
Scientific Data ◽  
Double Star ◽  
Scientific Instruments ◽  
Short Term ◽  
Scientific Communities ◽  
Near Earth Space ◽  
Science Operations ◽  
Space Environments

Abstract. For Double Star Project (DSP) exploration, the scientific operations are very important and essential for achieving its scientific objectives. Two years before the launch of the DSP satellites (TC-1 and TC-2) and during the mission operating phase, the long-term and short-term master science operations plans (MSOP) were produced. MSOP is composed of the operation schedules of all the scientific instruments, the modes and timelines of the Payload Service System on TC-1 and TC-2, and the data receiving schedules of the three ground stations. The MSOP of TC-1 and TC-2 have been generated according to the scientific objectives of DSP, the orbits of DSP, the near-Earth space environments and the coordination with Cluster, etc., so as to make full use of the exploration resources provided by DSP and to acquire as much quality scientific data as possible for the scientific communities. This paper has summarized the observation resources of DSP, the states of DSP and its evolution since the launch, the strategies and rules followed for operating the payload and utilizing the ground stations, and the production of MSOP. Until now, the generation and execution of MSOP is smooth and successful, the operating of DSP is satisfactory, and most of the scientific objectives of DSP have been fulfilled.

scholarly journals 638 The Economics of Organic Agriculture

HortScience ◽  
1999 ◽  
Vol 34 (3) ◽  
pp. 557E-557
Author(s):  
Robin G. Brumfield
Keyword(s):  
World War Ii ◽  
Surface Water ◽  
Production Systems ◽  
Free Market ◽  
Economic Benefits ◽  
Production Costs ◽  
Environmental Damage ◽  
Short Term ◽  
Alternative Farming

Since World War II, U.S. agriculture has reduced production costs by substituting petrochemicals for labor, often resulting in overuse of agricultural chemicals. Among the adverse results of chemical overuse are increases in certain pests, groundwater and surface water contamination, and surface water run-off. There is a growing perception that consumers bear the risk of pesticide use and farmers reap the profits. For farmers, the short-term risk of losing a crop that is already planted may take precedence over the long-term risks of such things as the pests developing resistance to pesticide, environmental damage, and applicator health risks. Alternative farming programs such as ICM and organic farming allow farmers to reconcile short-term risks and long-term benefits. Before farmers adopt an alternative system, they must be convinced that economic benefits from the alternative farming program surpass the costs incurred. Few studies have compared the cost of producing organic produce vs. using conventional production systems. One study found that net returns were slightly higher in ICM and organic systems that conventional ones. This is because of lower costs when using ICM systems and price premiums for organic crops. These results suggest that there may not be any trade-off between economic efficiency and environmentally friendly farming practices. If the society desires better environmental quality, it will be ready to pay premium price for the organic or ICM-grown vegetables. In a free-market system, farmers will use the market signals in the form of price, and they will produce accordingly.

scholarly journals Elite athletes and anticoagulant therapy: an intermittent dosing strategy

Hematology ◽  
2018 ◽  
Vol 2018 (1) ◽  
pp. 412-417 ◽  
Author(s):  
Stephan Moll ◽  
Joshua N. Berkowitz ◽  
Christopher W. Miars
Keyword(s):  
Anticoagulant Therapy ◽  
Athletic Participation ◽  
Scientific Data ◽  
Plasma Drug Concentration ◽  
Plasma Drug ◽  
Short Term ◽  
Athletic Activity ◽  
Risk Of Bleeding ◽  
Dosing Strategy

Abstract Traditionally, the athlete who requires long-term anticoagulation has been told to forgo participation in contact and collision sports. However, a strategy of short-term interruption of anticoagulant therapy may be designed for some athletes, allowing them return to full athletic activity. A personalized pharmacokinetic/pharmacodynamic study of a direct oral anticoagulant (DOAC) may allow athletic participation when plasma drug concentration is minimal and resumption of treatment after the risk of bleeding sufficiently normalizes. Scientific data and uncertainties regarding this approach, as well as practical challenges in the implementation, will be discussed.

scholarly journals Data Durabilities: Towards Conceptualizations of Scientific Long-Term Data Storage

2021 ◽  
Vol 7 (1) ◽  
pp. 12-21
Author(s):  
Estrid Sørensen ◽  
Laura Kocksch
Keyword(s):  
Data Storage ◽  
Open Data ◽  
Scientific Data ◽  
Data Reuse ◽  
Short Term ◽  
Temporal Dimension ◽  
Data Practices ◽  
Project Data ◽  
Term Data

With the increased requirement for open data and data reuse in the sciences the call for long-term data storage becomes stronger. However, long-term data storage is insufficiently theorized and often considered as simply short-term data that are stored longer. Interviews with scientists at a German university show that data are not in themselves durable; they are made durable. While Science & Technology Studies data research has emphasized the relational character of data, always embedded in local contexts and infrastructures, we propose to add the temporal dimension of data durability to this understanding. We replace notions of long-term and short-term stored data with notions of publication data and project data, because the latter terms point to the practices through which data durability is made in a variety of ways, contingent on the kind of research phases in which the data are embedded, and on their infrastructures and practices. With the notion of data durability devices we inquire into technologies and tools, techniques and skills as well as organizational arrangements, cultural norms and relations that contribute to making data durable. We define scientific data as durable as long as they can operate in a socio-technical apparatus and uphold their capacity to make claims about the world. The scientists’ data practices revealed what we term media data durability devices and scientific data durability devices. The former were media materiality, the care for this materiality, and the compatibility between data and the data apparatus, which all contributed to shaping data durability. Scientific data durability devices, on the other hand included concealment and competition, through which data durability was prolonged, but also distributed unevenly among researchers. With these proposed concepts we hope to initiate discussions on the making of long-term data storage, just as we believe the concepts to be helpful for making realistic and relevant decisions about what data to store and for how long.

Effect of Starch Source in Concentrate Diets and of Days on Feed on Growth Performance, Carcass Characteristics, Meat Quality, and Economic Return of Feedlot Steers

2021 ◽  
Author(s):  
Anchalee Khongpradit ◽  
Phoompong Boonsaen ◽  
Nitipong Homwong ◽  
Keiji Matsuba ◽  
Yasuo Kobayashi ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Growth Performance ◽  
Meat Quality ◽  
Dry Matter ◽  
Average Daily Gain ◽  
Carcass Characteristics ◽  
Short Term ◽  
Economic Return ◽  
Feedlot Steers

Abstract The effects of PS were determined as a concentrate added to feed and of the days it was short-term and long-term fed to fattening dairy steers on their growth performance, carcass characteristics, meat quality, and economic return. The experimental units comprised 36 feedlot dairy steers arranged as a 2 ⋅ 3 factorial in a completely randomized design. The first term (diet factors) consisted of ground corn (GC), ground cassava (CA), or pineapple stem starch (PS) at 37% dry matter (DM) in the concentrate. The second term (feeding factors) consisted of feeding the concentrate from 1 to 206 days (short-term feeding) or from 1 to 344 days (long-term feeding). At the end of the feeding term periods, the animals were slaughtered and the growth performance, carcass characteristics, and meat quality were evaluated. The average daily gain (ADG), feed:gain ratio, dry matter intake (DMI), hot carcass and cool carcass percentages, and backfat thickness were greater for steers on short-term than on long-term feeding. Feeding the different starch sources had no negative influence on the growth performance, carcass characteristics, and meat quality. However, the ADG of steers fed PS tended (P = 0.07) to be higher than for those fed GC or CA. In addition, the concentration of the fatty acid C14:1 in the longissimus dorsi muscle was the highest in steers fed CA. Different starch sources had similar values for saturated fatty acid (SFA) and monounsaturated fatty acid (MUFA.) Long-term feeding increased MUFA. Pineapple stem starch could be a useful feed ingredient for feedlot steers as an alternative starch source for energy.

Conceptual short-term memory (CSTM) supports core claims of Christiansen and Chater

2016 ◽  
Vol 39 ◽  
Author(s):  
Mary C. Potter
Keyword(s):  
Working Memory ◽  
Rapid Serial Visual Presentation ◽  
Language Comprehension ◽  
Short Term Memory ◽  
Visual Presentation ◽  
Long Term Memory ◽  
Short Term ◽  
Term Memory ◽  
Use Of Knowledge

AbstractRapid serial visual presentation (RSVP) of words or pictured scenes provides evidence for a large-capacity conceptual short-term memory (CSTM) that momentarily provides rich associated material from long-term memory, permitting rapid chunking (Potter 1993; 2009; 2012). In perception of scenes as well as language comprehension, we make use of knowledge that briefly exceeds the supposed limits of working memory.

Ultrastructural investigations of MDL 19,660-induced effects on the canine platelet and megakaryocyte

1990 ◽  
Vol 48 (3) ◽  
pp. 374-375
Author(s):  
D.E. Loudy ◽  
J. Sprinkle-Cavallo ◽  
J.T. Yarrington ◽  
F.Y. Thompson ◽  
J.P. Gibson
Keyword(s):  
Antidepressant Drug ◽  
Beagle Dogs ◽  
Long Term Effects ◽  
Short Term ◽  
Platelet Counts ◽  
Toxicological Studies ◽  
Induced Aggregation ◽  
Internal Architecture

Previous short term toxicological studies of one to two weeks duration have demonstrated that MDL 19,660 (5-(4-chlorophenyl)-2,4-dihydro-2,4-dimethyl-3Hl, 2,4-triazole-3-thione), an antidepressant drug, causes a dose-related thrombocytopenia in dogs. Platelet counts started to decline after two days of dosing with 30 mg/kg/day and continued to decrease to their lowest levels by 5-7 days. The loss in platelets was primarily of the small discoid subpopulation. In vitro studies have also indicated that MDL 19,660: does not spontaneously aggregate canine platelets and has moderate antiaggregating properties by inhibiting ADP-induced aggregation. The objectives of the present investigation of MDL 19,660 were to evaluate ultrastructurally long term effects on platelet internal architecture and changes in subpopulations of platelets and megakaryocytes.Nine male and nine female beagle dogs were divided equally into three groups and were administered orally 0, 15, or 30 mg/kg/day of MDL 19,660 for three months. Compared to a control platelet range of 353,000- 452,000/μl, a doserelated thrombocytopenia reached a maximum severity of an average of 135,000/μl for the 15 mg/kg/day dogs after two weeks and 81,000/μl for the 30 mg/kg/day dogs after one week.

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