scholarly journals 8 How to drive efficiencies in pork production: What are the gaps in knowledge and obstacles?

2020 ◽  
Vol 98 (Supplement_3) ◽  
pp. 24-25
Author(s):  
Steve J Kitt
Keyword(s):  
Production Efficiency ◽  
Scientific Discipline ◽  
Growing Pigs ◽  
Scientific Application ◽  
Vitro Assay ◽  
Pork Production ◽  
The Impact ◽  
Swine Nutrition ◽  
Cross Fostering

Abstract Swine nutrition and production has been the cornerstone scientific discipline of the Midwest Section ASAS meeting for decades. During this time, the impact of scientists’ work and the scientific application by swine professionals has been profound. However, if we are to double our food supply by 2050, we have much to do. This presentation will attempt to illustrate contrasting examples of production efficiencies associated with differing production goals, and highlight examples of processes that lead to improved pork production efficiency within the discipline of swine nutrition. This presentation will also cover obstacles and gaps in knowledge that practicing nutritionists, pork producers, and other professionals regularly encounter. Some knowledge gaps are within a single scientific discipline and if resources were put towards the problem would be relatively easily solved. Examples include: development of an inexpensive in vitro assay to assess DDGS amino acid digestibility, re-defining the upper and lower critical effective temperature for modern pigs, defining the minimum and best equipment for growing pigs, identifying additivity effects of various dietary compounds, scientifically sound method(s) to understand and resolve mycotoxin contamination of grains. Other gaps in knowledge are more complex and require multi-disciplinary scientific approach. Examples include: defining root causes of sow mortality, defining factors influencing pig and piglet mortality especially during health challenges, developing models to assist optimization of litter size and post-wean performance, determining best practices of cross-fostering. Pork production will continue to be a viable yet challenging endeavor. It will require persistence, collaboration, and ingenuity from our scientific and pork production community in order to adequately feed the growing population’s demand for protein.

27 Greenhouse Gas Emissions and a Partial Life Cycle Assessment When Growing Pigs Are Fed High Wheat Millrun Diets

2021 ◽  
Vol 99 (Supplement_1) ◽  
pp. 24-25
Author(s):  
Agbee L Kpogo ◽  
Jismol Jose ◽  
Josiane Panisson ◽  
Bernardo Predicala ◽  
Alvin Alvarado ◽  
...  
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Greenhouse Gas ◽  
Growing Pigs ◽  
Pork Production ◽  
Feed Production ◽  
Farm Model ◽  
And Performance ◽  
Carbon Dioxide Co2 ◽  
The Impact

Abstract The impact of feeding growing pigs with high wheat millrun diets on the global warming potential (GWP) of pork production was investigated. In study 1, a 2 × 2 factorial arrangement of wheat millrun (0 or 30%) and multi-carbohydrase enzyme (0 or 1 mg kg-1) as main effects was utilized. For each of 16 reps, 6 pigs (60.2±2.2 kg BW) were housed in environmental chambers for 14d. Air samples were collected and analyzed for carbon dioxide (CO2); nitrous oxide (N2O); and methane (CH4). In study 2, data from study 1 and performance data obtained from a previous feeding trial were utilized in a life cycle assessment (LCA) framework that included feed production. The Holos farm model (Agriculture and Agri-Food Canada, Lethbridge. AB) was used to estimate emissions from feed production. In study 1, total manure output from pigs fed 30% wheat millrun diets was 30% greater than pigs on the 0% wheat millrun diets (P < 0.05), however, Feeding diets with 30% millrun did not affect greenhouse gas (GHG) output (CH4, 4.7, 4.9; N2O, 0.45, 0.42; CO2, 1610, 1711; mg s-1 without or with millrun inclusion, respectively; P > 0.78). Enzyme supplementation had no effect on GHG production (CH4, 4.5, 5.1; N2O, 0.46, 0.42; CO2, 1808, 1513; mg s-1 without or with enzymes, respectively; P > 0.51). In study 2, the LCA indicated that the inclusion of 30% wheat millrun in diets for growing pigs resulted in approximately a 25% reduction in GWP when compared to the no wheat millrun diets. Our results demonstrate that 30% wheat millrun did not increase GHG output from the pigs, and thus the inclusion of wheat millrun in diets of growing pigs can reduce the GWP of pork production.

Soaps and Detergents: Alternatives to Animal Eye Irritation Tests

1996 ◽  
Vol 15 (1) ◽  
pp. 1-44 ◽  
Author(s):  
Mildred S. Christian ◽  
Robert M. Diener
Keyword(s):  
False Negative ◽  
Screening Tools ◽  
Current Status ◽  
In Vitro Assays ◽  
Computer Search ◽  
Eye Irritation ◽  
Vitro Assay ◽  
Predictive Values ◽  
The Impact

An extensive computer search was conducted, and a comprehensive overview of the current status of alternatives to animal eye irritation tests was obtained. A search of Medline and Toxline databases (1988 to present) was supplemented with references from sources regarding in vitro eye irritation. Particular attention was paid to soap and detergent products and related ingredients. Eighty-five references are included in the review; the in vitro assays are categorized, and their predictive values for assessing acute ocular irritation are evaluated and compared with the Draize rabbit eye irritation assay and with each other. The present review shows that the increased activity of scientists from academia, industry, and regulatory agencies has resulted in substantial progress in developing alternative in vitro procedures and that a number of large, interlaboratory evaluations and international workshops have assisted in the selection process. However, none of these methodologies has obtained acceptance for regulatory classification purposes. Conclusions drawn from this review include that (a) no single in vitro assay is considered capable of replacing the Draize eye irritation test; (b) the chorioallantoic membrane vascular assay (CAMVA) or the hen egg test-chorio-allantoic membrane test (HET-CAM), the chicken or bovine enucleated eye test, the neutral red and plasminogen activation assays for cytotoxicity, and the silicon microphysiometer appear to have the greatest potential as screening tools for eye irritation; and (c) choosing a specific assay or series of assays will depend on the type of agent tested and the impact of false-negative or false-positive results. New assays will continue to be developed and should be included in future evaluations, when sufficient data are available.

scholarly journals Impact of Glucosinolate Content in Broccoli (Brassica oleracea (Italica Group)) on Growth of Pseudomonas marginalis, a Causal Agent of Bacterial Soft Rot

Plant Disease ◽  
2002 ◽  
Vol 86 (6) ◽  
pp. 629-632 ◽  
Author(s):  
Craig S. Charron ◽  
Carl E. Sams ◽  
Craig H. Canaday
Keyword(s):  
Brassica Oleracea ◽  
Degradation Products ◽  
Linear Regression Analysis ◽  
Soft Rot ◽  
Causal Agent ◽  
Glucosinolate Content ◽  
Bacterial Soft Rot ◽  
Vitro Assay ◽  
The Impact

Glucosinolate degradation products are known to suppress microbes. Brassica species produce glucosinolates. Previous investigations determined that susceptibility to bacterial soft rot of broccoli (Brassica oleracea (Italica group)) varied significantly by cultivar. To evaluate the impact of glucosinolates on Pseudomonas marginalis, a causal agent of bacterial soft rot, glucosinolates were measured in lyophilized florets from broccoli ‘Arcadia’, ‘Emperor’, ‘Green Comet’, ‘Green Valiant’, ‘Marathon’, ‘Packman’, ‘Premium Crop’, and ‘Shogun’. Total glucosinolate content was highest in ‘Shogun’ (29.8 μmol/g) and lowest in ‘Emperor’ (0.5 μmol/g). In an in vitro assay, simple linear regression analysis showed that 48% of differences in suppression of P. marginalis growth could be explained by differences in total glucosinolate content (P ≤ 0.01). Plant breeding efforts should include glucosinolate levels as a factor in selecting for disease resistance.

scholarly journals A COMPARATIVE ANALYSIS OF PLANT GROWTH-PROMOTING TRAITS OF Pseudomonas AND Bacillus STRAINS ISOLATED FROM Lolium perenne RHIZOSPHERIC SOIL IN VOJVODINA (SERBIA) AND THEIR EFFECT ON THE PLANT YIELD

2020 ◽  
Vol 19 (3) ◽  
pp. 37-45
Author(s):  
Dragana Stamenov ◽  
Timea I. Hajnal-Jafari ◽  
Biljana Najvirt ◽  
Snežana Anđelković ◽  
Jelena Tomić ◽  
...  
Keyword(s):  
Plant Growth ◽  
Lolium Perenne ◽  
Biochemical Characterization ◽  
Total Yield ◽  
Forage Crops ◽  
Vitro Assay ◽  
Plant Growth Promoting ◽  
Growth Promoting ◽  
The Impact

The objective of this work was to do a comparative study of Pseudomonas and Bacillus isolates for their plant growth-promoting (PGP) potential, monitoring the impact of selected isolates on the yield of English ryegrass (Lolium perenne). Isolation, physiological and biochemical characterization, in vitro assay of enzymatic and plant-growth promoting activities of isolates were done. Pseudomonas isolates have been shown to have the ability to use different sources of carbon, to live in the condition of low pH as well as temperature and to produce siderophore. On the other hand, Bacillus isolates have the ability to solubilize phosphate, to produce a greater amount of indol-3-acetic acid (IAA) than Pseudomonas isolates and have an inhibitory effect on the growth of phytopathogenic fungi. In other investigated traits, isolates were similar. The use of Pseudomonas sp. P12 and Bacillus sp. B1 isolates had a positive effect on the plant mass and total yield, which indicate that the use of these isolates can result in a better yield of forage crops.

scholarly journals Alternative Splicing of FN (Fibronectin) Regulates the Composition of the Arterial Wall Under Low Flow

2020 ◽  
Author(s):  
Patrick A. Murphy ◽  
Noor Jailkhani ◽  
Sarah-Anne Nicholas ◽  
Amanda M. Del Rosario ◽  
Jeremy L. Balsbaugh ◽  
...  
Keyword(s):  
Extracellular Matrix ◽  
Alternative Splicing ◽  
Low Flow ◽  
Matrix Composition ◽  
Splice Isoforms ◽  
Vitro Assay ◽  
Disturbed Flow ◽  
The Impact

Objective: Exposure of the arterial endothelium to low and disturbed flow is a risk factor for the erosion and rupture of atherosclerotic plaques and aneurysms. Circulating and locally produced proteins are known to contribute to an altered composition of the extracellular matrix at the site of lesions, and to contribute to inflammatory processes within the lesions. We have previously shown that alternative splicing of FN (fibronectin) protects against flow-induced hemorrhage. However, the impact of alternative splicing of FN on extracellular matrix composition remains unknown. Approach and Results: Here, we perform quantitative proteomic analysis of the matrisome of murine carotid arteries in mice deficient in the production of FN splice isoforms containing alternative exons EIIIA and EIIIB (FN-EIIIAB null) after exposure to low and disturbed flow in vivo. We also examine serum-derived and endothelial-cell contributions to the matrisome in a simplified in vitro system. We found flow-induced differences in the carotid artery matrisome that were impaired in FN-EIIIAB null mice. One of the most interesting differences was reduced recruitment of FBLN1 (fibulin-1), abundant in blood and not locally produced in the intima. This defect was validated in our in vitro assay, where FBLN1 recruitment from serum was impaired by the absence of these alternatively spliced segments. Conclusions: Our results reveal the extent of the dynamic alterations in the matrisome in the acute response to low and disturbed flow and show how changes in the splicing of FN, a common response in vascular inflammation and remodeling, can affect matrix composition.

scholarly journals Mitotic arrest affects clustering of tumor cells

Cell Division ◽  
2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Julia Bonnet ◽  
Lise Rigal ◽  
Odile Mondesert ◽  
Renaud Morin ◽  
Gaëlle Corsaut ◽  
...  
Keyword(s):  
Tumor Cells ◽  
Circulating Tumor Cells ◽  
Cancer Cell ◽  
Cell Aggregation ◽  
Metastatic Potential ◽  
Mitotic Arrest ◽  
Vitro Assay ◽  
The Impact ◽  
Mcf 7

Abstract Background Cancer cell aggregation is a key process involved in the formation of tumor cell clusters. It has recently been shown that clusters of circulating tumor cells (CTCs) have an increased metastatic potential compared to isolated circulating tumor cells. Several widely used chemotherapeutic agents that target the cytoskeleton microtubules and cause cell cycle arrest at mitosis have been reported to modulate CTC number or the size of CTC clusters. Results In this study, we investigated in vitro the impact of mitotic arrest on the ability of breast tumor cells to form clusters. By using live imaging and quantitative image analysis, we found that MCF-7 cancer cell aggregation is compromised upon incubation with paclitaxel or vinorelbine, two chemotherapeutic drugs that target microtubules. In line with these results, we observed that MCF-7 breast cancer cells experimentally synchronized and blocked in metaphase aggregated poorly and formed loose clusters. To monitor clustering at the single-cell scale, we next developed and validated an in vitro assay based on live video-microscopy and custom-designed micro-devices. The study of cluster formation from MCF-7 cells that express the fluorescent marker LifeAct-mCherry using this new assay allowed showing that substrate anchorage-independent clustering of MCF-7 cells was associated with the formation of actin-dependent highly dynamic cell protrusions. Metaphase-synchronized and blocked cells did not display such protrusions, and formed very loose clusters that failed to compact. Conclusions Altogether, our results suggest that mitotic arrest induced by microtubule-targeting anticancer drugs prevents cancer cell clustering and therefore, could reduce the metastatic potential of circulating tumor cells.

scholarly journals Mitotic arrest affects clustering of tumor cells

2020 ◽  
Author(s):  
Julia Bonnet ◽  
Lise Rigal ◽  
Odile Mondesert ◽  
Renaud Morin ◽  
Gaelle Corsaut ◽  
...  
Keyword(s):  
Tumor Cells ◽  
Circulating Tumor Cells ◽  
Cancer Cell ◽  
Cell Aggregation ◽  
Metastatic Potential ◽  
Mitotic Arrest ◽  
Vitro Assay ◽  
The Impact ◽  
Mcf 7

Abstract BackgroundCancer cell aggregation is a key process involved in the formation of tumor cells clusters. It has recently been shown that clusters of circulating tumor cells (CTCs) have an increased metastatic potential compared to isolated circulating tumor cells. Several widely used chemotherapeutic agents that target the cytoskeleton microtubules and cause cell cycle arrest at mitosis have been reported to modulate the number of CTCs or the size of CTC clusters.ResultsIn this study, we investigated in vitro the impact of mitotic arrest on the ability of breast tumor cells to form clusters. By using live imaging and quantitative image analysis, we found that MCF-7 cancer cell aggregation is compromised upon incubation with paclitaxel or vinorelbine, two chemotherapeutic drugs that target microtubules. In line with these results, we found that MCF-7 breast cancer cells experimentally synchronized and blocked in metaphase aggregated poorly with strongly reduced cohesion. To monitor clustering at the single-cell scale, we next developed and validated an in vitro assay based on live video-microscopy and custom-designed micro-devices. The study of cluster formation from MCF-7 cells that express the fluorescent marker LifeAct-mCherry using this new assay allowed showing that substrate anchorage-independent clustering of MCF-7 cells was associated with the formation of actin-dependent highly dynamic cell protrusions. Metaphase-synchronized and blocked cells did not display such protrusions, and formed very loose clusters that failed to compact.ConclusionsAltogether, our results suggest that mitotic arrest induced by microtubule-targeting anticancer drugs prevents cancer cell clustering and therefore, could reduce the metastatic potential of circulating tumor cells.

scholarly journals Altered synaptic connectivity in an in vitro human model of STXBP1 encephalopathy

2021 ◽  
Author(s):  
Faye McLeod ◽  
Anna Dimtsi ◽  
David Lewis-Smith ◽  
Rhys Thomas ◽  
Gavin J Clowry ◽  
...  
Keyword(s):  
Epileptic Encephalopathy ◽  
Synaptic Function ◽  
Human Model ◽  
Cortical Plate ◽  
Vitro Assay ◽  
Genetic Manipulations ◽  
Downstream Effects ◽  
Cortical Regions ◽  
The Impact

Early infantile epileptic encephalopathies are devastating conditions, generally of genetic origin, but the pathological mechanisms often remain obscure. A major obstacle in this field of research is the difficulty of studying cortical brain development in humans, in utero. To address this, we established an in vitro assay to study the impact of gene variants on the developing human brain, using living organotypic cultures of the human subplate and neighbouring cortical regions, prepared from ethically sourced, 14-17 post conception week brain tissue (www.hdbr.org). We were able to maintain cultures for several months, during which time, the gross anatomical structures of the cortical plate, subplate and marginal zone persisted, while neurons continued to develop morphologically, and form new synaptic networks. This preparation thus permits the study of genetic manipulations, and their downstream effects, upon an intact developing human cortical network. We focused upon STXBP1 haploinsufficiency, which is among the most common genetic causes of infantile epileptic encephalopathy. This was induced using shRNA interference, leading to impaired synaptic function and a drop in the number of glutamatergic synapses. We thereby provide a critical proof-of-principle for how to study the impact of any gene of interest on the development of the human cortex.

scholarly journals Development, validation, and application of the ribosome separation and reconstitution system for protein translation in vitro

2021 ◽  
Author(s):  
Brandon M Trainor ◽  
Dimitri G Pestov ◽  
Natalia Shcherbik
Keyword(s):  
Gene Expression ◽  
Regulation Of Gene Expression ◽  
Mrna Translation ◽  
Protein Translation ◽  
Transcription Control ◽  
Vitro Assay ◽  
Control Of Gene Expression ◽  
Translational Machinery ◽  
The Impact

The conventional view regarding regulation of gene expression is based on transcription control. However, a growing number of recent studies has revealed the important additional impact of translational regulation. Eukaryotic translational machinery appears to be capable of reprogramming mRNA translation to generate proteins required to maintain a healthy cellular proteostasis under particular physiological conditions or to adapt to stress. Although the mechanisms of such remarkable regulation are beginning to emerge, recent studies have identified the ribosome as one of the major constituents of translation-dependent control of gene expression that is especially important during stress. Built of RNA and proteins, ribosomes are susceptible to environmental and intracellular stresses. How stress-modified ribosomes regulate translation and whether they play a role in stress-induced gene expression remain largely elusive. This knowledge gap is likely due to the lack of an appropriate experimental system. Canonical approaches based on exposing cells or cell-free extracts to stressors provide inconclusive results due to off-target effects of modifying agents. Here we describe a robust and simple in vitro assay that allows separation of yeast ribosomes from other translational machinery constituents, followed by reconstitution of the translation reaction. This ribosome separation and reconstitution assay (RSR) is highly advantageous, as it allows modification of ribosomes without compromising other key translational components, followed by supplementing the ribosomes back into translation reactions containing undamaged, translationally-competent yeast lysate. Besides addressing the impact of ribosome-derived stress on translation, RSR can also be used to characterize mutated ribosomes and ribosomes devoid of associated factors.

Further Considerations Towards an Effective and Efficient Oncology Drug Discovery DMPK Strategy

2020 ◽  
Vol 21 (2) ◽  
pp. 145-162 ◽  
Author(s):  
Beth Williamson ◽  
Nicola Colclough ◽  
Adrian John Fretland ◽  
Barry Christopher Jones ◽  
Rhys Dafydd Owen Jones ◽  
...  
Keyword(s):  
Drug Discovery ◽  
Drug Exposure ◽  
Phase Iii ◽  
Human Pharmacokinetics ◽  
Vitro Assay ◽  
Pharmacodynamic Modelling ◽  
Oncology Drug ◽  
The Impact

Background: DMPK data and knowledge are critical in maximising the probability of developing successful drugs via the application of in silico, in vitro and in vivo approaches in drug discovery. Methods: The evaluation, optimisation and prediction of human pharmacokinetics is now a mainstay within drug discovery. These elements are at the heart of the ‘right tissue’ component of AstraZeneca’s ‘5Rs framework’ which, since its adoption, has resulted in increased success of Phase III clinical trials. With the plethora of DMPK related assays and models available, there is a need to continually refine and improve the effectiveness and efficiency of approaches best to facilitate the progression of quality compounds for human clinical testing. Results: This article builds on previously published strategies from our laboratories, highlighting recent discoveries and successes, that brings our AstraZeneca Oncology DMPK strategy up to date. We review the core aspects of DMPK in Oncology drug discovery and highlight data recently generated in our laboratories that have influenced our screening cascade and experimental design. We present data and our experiences of employing cassette animal PK, as well as re-evaluating in vitro assay design for metabolic stability assessments and expanding our use of freshly excised animal and human tissue to best inform first time in human dosing and dose escalation studies. Conclusion: Application of our updated drug-drug interaction and central nervous system drug exposure strategies are exemplified, as is the impact of physiologically based pharmacokinetic and pharmacokinetic-pharmacodynamic modelling for human predictions.

Sign in / Sign up

Export Citation Format

Share Document