Modeling nutrient supply to dairy cattle from a feedstuff using NRC-2001 (a TDN-based model) with inputs based on in situ and mobile bag technique measurements

2005 ◽  
Vol 85 (4) ◽  
pp. 513-519 ◽  
Author(s):  
P. Yu
Keyword(s):  
Dairy Cattle ◽  
National Research Council ◽  
Nutrient Supply ◽  
Microbial Protein ◽  
System A ◽  
Endogenous Protein ◽  
Lupin Seeds ◽  
Feed Protein ◽  
Made In

The objectives of this study were to use the NRC-2001 model with inputs based on in situ and mobile bag techniques to (1) predict the potential nutrient supply to dairy cows using an exampled feed- whole lupin seeds that were systematically toasted and (2) quantitatively determine the effects of toasting (which shifted degradation of protein from the rumen to the abomasum and small intestine without changing intestinal digestion) and optimal toasting conditions by the NRC-2001 model. The quantitative predictions were made in terms of: (1) rumen undegraded and degraded feed protein, (2) truly absorbed undegraded protein, (3) potential microbial protein synthesized in the rumen from rumen available protein or (4) from total digestible nutrients (TDN), (5) truly absorbed rumen synthesized microbial protein, (6) truly absorbed rumen endogenous protein, (7) total metabolizable protein (MP), as well as (8) the protein degradation balance (PDB). The results show that using the NRC-2001 model with inputs based on in situ and mobile bag techniques, the predicted PDB and MP supply to dairy cattle was significantly improved. However, no optimal condition could be obtained from this study due to high PDB values (>48 g kg-1 DM) in all the treatments, predicted by the model. With toasting, temperature and/or duration could go still higher than 136°C and/or longer than 15 min to further prevent potential N loss in the rumen if total tract digestion is not depressed. More study is needed. However, the results differed from that published with the DVE/OEB system (a non-TDN-based model) although the two models had significant correlations with high R (>0.99) values. Using the NRC model, the overall mean for MP was higher (+10 g kg-1 DM), but the PDB values were lower (-12 g kg-1 DM) in comparison with that predicted by the non-TDN based model for the whole lupin seeds. Key words: Modeling nutrient supply, dairy cattle; National Research Council, in situ, mobile bag technique

scholarly journals Study and Analysis of Interference Signals of the LTE System of the GNSS Receiver

Sensors ◽  
2021 ◽  
Vol 21 (14) ◽  
pp. 4901
Author(s):  
Lucjan Setlak ◽  
Rafał Kowalik
Keyword(s):  
End User ◽  
Current Time ◽  
Gnss Receiver ◽  
System A ◽  
Telecommunication Systems ◽  
Depth Analysis ◽  
Gnss Receivers ◽  
Interference Signals ◽  
The Subject ◽  
Made In

Sometimes, it is impossible to conduct tests with the use of the GNSS system, or the obtained results of the measurements made differ significantly from the predicted accuracy. The most common cause of the problems (external factors, faulty results) are interference disturbances from other radio telecommunication systems. The subject of this paper is to conduct research, the essence of which is an in-depth analysis in the field of elimination of LTE interference signals of the GNSS receiver, that is based on the developed effective methods on counteracting the phenomenon of interference signals coming from this system and transmitted on the same frequency. Interference signals are signals transmitted in the GNSS operating band, and unwanted signals may cause incorrect processing of the information provided to the end-user about his position, speed, and current time. This article presents methods of identifying and detecting interference signals, with particular emphasis on methods based on spatial processing of signals transmitted by the LTE system. A comparative analysis of the methods of detecting an unwanted signal was made in terms of their effectiveness and complexity of their implementation. Moreover, the concept of a new comprehensive anti-interference solution was proposed. It includes, among others, information on the various stages of GNSS signal processing in the proposed system, in relation to the algorithms used in traditional GNSS receivers. The final part of the article presents the obtained research results and the resulting significant observations and practical conclusions.

Engaging with the science and politics of biodiversity futures: a literature review

2021 ◽  
pp. 1-8
Author(s):  
Carina Wyborn ◽  
Elena Louder ◽  
Mike Harfoot ◽  
Samantha Hill
Keyword(s):  
Human Life ◽  
Global Environmental Change ◽  
Life Forms ◽  
Trade Offs ◽  
Global Environmental ◽  
Science And Politics ◽  
Science Community ◽  
Impact On Biodiversity ◽  
Made In

Summary Future global environmental change will have a significant impact on biodiversity through the intersecting forces of climate change, urbanization, human population growth, overexploitation, and pollution. This presents a fundamental challenge to conservation approaches, which seek to conserve past or current assemblages of species or ecosystems in situ. This review canvases diverse approaches to biodiversity futures, including social science scholarship on the Anthropocene and futures thinking alongside models and scenarios from the biophysical science community. It argues that charting biodiversity futures requires processes that must include broad sections of academia and the conservation community to ask what desirable futures look like, and for whom. These efforts confront political and philosophical questions about levels of acceptable loss, and how trade-offs can be made in ways that address the injustices in the distribution of costs and benefits across and within human and non-human life forms. As such, this review proposes that charting biodiversity futures is inherently normative and political. Drawing on diverse scholarship united under a banner of ‘futures thinking’ this review presents an array of methods, approaches and concepts that provide a foundation from which to consider research and decision-making that enables action in the context of contested and uncertain biodiversity futures.

scholarly journals Ruminal Supplementation of Direct-Fed Microbials on Diurnal pH Variation and In Situ Digestion in Dairy Cattle

2002 ◽  
Vol 85 (2) ◽  
pp. 429-433 ◽  
Author(s):  
J.E. Nocek ◽  
W.P. Kautz ◽  
J.A.Z. Leedle ◽  
J.G. Allman
Keyword(s):  
Dairy Cattle ◽  
Ph Variation

Chemistry of Food and Nutrition

PEDIATRICS ◽  
1948 ◽  
Vol 1 (3) ◽  
pp. 434-434
Keyword(s):  
Federal Government ◽  
Research Council ◽  
National Research Council ◽  
Dietary Recommendations ◽  
Food And Nutrition ◽  
Nutritive Values ◽  
College Classes ◽  
Made In

While this book is designed primarily for students in college classes, it should be of service to many other types of readers. Essential changes have been made in the text, several chapters have been rewritten, and two new chapters dealing with the nutritive characteristics of the chief group of foods and the causes and extent of variations in the nutritive values of food have been added. These values have been revised in accordance with the recent dietary recommendations and studies of food values by the Federal Government and the National Research Council.

317 Effect of the Whole Cottonseed with Pre-treatment on the Digestibility, Productivity, and Milk Fat Profile of Dairy Cattle

2021 ◽  
Vol 99 (Supplement_3) ◽  
pp. 172-173
Author(s):  
Xiaoge Sun ◽  
Yitong Su ◽  
YangYi Hao ◽  
Gaokun Liu ◽  
Yue Gong ◽  
...  
Keyword(s):  
Dairy Cattle ◽  
Milk Fat ◽  
Alkali Treatment ◽  
Mixed Alkali ◽  
Group I ◽  
Animal Feeding ◽  
Group Ii ◽  
Whole Cottonseed

Abstract To improve the efficiency of whole cottonseed (WCS) on dairy cattle, crush and alkali treatment were combined (Table 1) in this study. The gastrointestinal tract digestibility of WCS were measured by in situ ruminal incubation and in vitro fermentation, respectively. Finally, animal feeding experiment was conducted to evaluate the effect of processed WCS on dairy cattle. A total of 30 Holstein dairy cows with similar physiological status were allocated to three groups (CON, Group I, and Group II). Ration for the CON group was a basic ration with no WCS, ration with about 8% non-processed WCS was for Group I (DM basis), while the Group II was provided by the ration added with 8% Crush-Alkali (4% mixed alkali solids with NaOH/CaO ratio at 1:1) treated WCS. Results of the in situ and in vitro experiments showed that, compared with non-treated WCS, Crushing-Alkali treatment groups significantly improved WCS ruminal effective degradation rate of dry matter (DM), crude protein (CP), ether extract (EE), and neutral detergent fiber (NDF) (P < 0.05). Furthermore, Crush-Alkali (4% mixed alkali solids with NaOH/CaO ratio at 1:1) was the most beneficial to improve WCS gastrointestinal degradation of DM, CP and NDF, as well as enhance WCS rumen-bypass of EE. With the lowest free gossypol content (P< 0.05). Results of animal feeding experiment showed that DMI, 4% fat corrected milk production (4% FCM), milk protein, milk fat, and content of short-chain saturated fatty acids in milk in Group II significantly increased (P < 0.05) compared with CON group. DMI, ω-6 polyunsaturated fatty acids (PUFA) in milk, and the ratio of ω-6 to ω-3 PUFA were significantly higher in Group II than that in Group I (P < 0.05). Additionally, free gossypol concentration in serum and milk, as well as parameters reflecting liver function were not notably different among the three groups (P > 0.05).

"A FESTIVAL OF BRIGANDS": IN SEARCH OF DEMOCRACY AND POLITICAL LEGITIMACY IN MALI

2020 ◽  
Vol 35 (2) ◽  
Author(s):  
Bruce Whitehouse
Keyword(s):  
Political Legitimacy ◽  
Warning Signs ◽  
Democratic Transitions ◽  
Weak State ◽  
Coup D'etat ◽  
State Institutions ◽  
System A ◽  
The Government ◽  
Systemic Corruption ◽  
Made In

Mali's coup d'état in March 2012 and the subsequent occupation of northern Mali by Islamist and separatist rebels took many observers by surprise. How could an erstwhile model of peaceful democratic transition collapse so swiftly? Why did so few ordinary Malians stand up in defence of their 20-year-old democracy? Combining accounts from Malian and foreign journalists with observations made in Bamako leading up to and during the dramatic events of early 2012, this article assesses the failures of Mali's pre-coup political system. A combination of the tenuous rule of law, weak state institutions, and perceptions of systemic corruption deeply eroded Malians' faith in their democracy. The junta that ousted Mali's elected president in March 2012, despite its international isolation, skillfully manipulated public frustrations with the government as well as local symbols and discourses pertaining to heroic leaders to gain support and legitimacy at home. The crisis in Mali was preceded by certain warning signs, some of which might be applied to gauge the health of democratic transitions elsewhere in Africa.

Comparison of supplemental cobalt form on fibre digestion and cobalamin concentrations in cattle

2017 ◽  
Vol 155 (5) ◽  
pp. 832-838 ◽  
Author(s):  
R. C. WATERMAN ◽  
W. L. KELLY ◽  
C. K. LARSON ◽  
M. K. PETERSEN
Keyword(s):  
Crude Protein ◽  
Dry Matter ◽  
National Research Council ◽  
Residual Effect ◽  
Vitamin B ◽  
Serum Concentrations ◽  
Forage Digestibility ◽  
Randomized Experimental Design ◽  
To Receive

SUMMARYCobalt (Co) is essential for rumen microbial metabolism to synthesize methane, acetate and methionine. It also serves as a structural component of vitamin B12(cobalamin), which functions as a coenzyme in energy metabolism. A study was conducted to determine if Co form (carbonatev. glucoheptonate) supplemented above the National Research Council requirements would improve digestibility of a low-quality forage diet and change serum cobalamin concentrations. Nineteen ruminally cannulated cows (577 ± 13 kg) were fed individually in a completely randomized experimental design. Cows were fed a grass hay diet that contained (79·2 g/kg crude protein, 565 g/kg total digestible nutrients, 633·2 g/kg neutral detergent fibre (NDF), 874·2 g/kg dry matter) at a rate of 0·02% of body weight on a as fed basis for a 62-day study, which consisted of three periods; acclimation (AC), treatment (TR) and residual (RE). Measurements taken in the AC period were used as covariates for analysis in the TR and RE periods. Cows were stratified by age (5 ± 0·4 years) and lactational history, and assigned to receive 12·5 mg supplemental Co in one of two forms: (1) 27·2 mg of Co carbonate (CC,n= 11 cows) or (2) 50 mg of Co glucoheptonate (CGH,n= 8 cows). Supplement was administered daily via a gelatin capsule placed directly into the rumen 2 h after feeding. During the last 96 h of each period, forage digestibility was measured using anin situnylon bag technique. Blood samples were collected 4 and 6 h following feeding, and 24 h before the end of each period. A treatment × period interaction was detected forin situorganic matter (OM) disappearance at 96 h; (TR period: 684 and 708 ± 81 g/kg; RE period: 676 and 668 ± 75 g/kg, for CC and CGH, respectively). Once inclusion of Co in the CGH group was removed, OM disappearance was reduced by 4·01% compared with 0·82% in the CC cows. The NDF disappearance (OM basis) was less for the TR compared with the RE at 48 h (629 and 652 ± 39 g/kg, respectively). However, by 96 h NDF disappearance was greater for TR than the RE (704 and 689 ± 44 g/kg; respectively). No differences were detected for cobalamin serum concentrations or rate of fibre fermentation. The outcomes of the current research signify that there may be a slight residual effect of Co supplementation on fermentation; there was also an indication that Co source may enhance the overall extent of fermentation.

Use of enzymatic solubility with ficin (EC 3.4.22.3) to predict in situ feed protein degradability

1996 ◽  
Vol 59 (4) ◽  
pp. 245-254 ◽  
Author(s):  
I. Kosmala ◽  
A. Antoniewicz ◽  
J. De Boever ◽  
T. Hvelplund ◽  
J. Kowalczyk
Keyword(s):  
Feed Protein ◽  
Protein Degradability

scholarly journals Sources and sinks of acetone, methanol, and acetaldehyde in North Atlantic marine air

2005 ◽  
Vol 5 (7) ◽  
pp. 1963-1974 ◽  
Author(s):  
A. C. Lewis ◽  
J. R. Hopkins ◽  
L. J. Carpenter ◽  
J. Stanton ◽  
K. A. Read ◽  
...  
Keyword(s):  
North Atlantic ◽  
Degradation Mechanism ◽  
Chemical Degradation ◽  
Oh Radical ◽  
Detailed Model ◽  
Atmospheric Lifetime ◽  
Sources And Sinks ◽  
Marine Air ◽  
Made In

Abstract. Measurements of acetone, methanol, acetaldehyde and a range of non-methane hydrocarbons have been made in North Atlantic marine air at the Mace Head observatory. Under maritime conditions the combination of OVOCs (acetone, methanol and acetaldehyde) contributed up to 85% of the total mass of measured non methane organics in air and up to 80% of the OH radical organic sink, when compared with the sum of all other organic compounds including non-methane hydrocarbons, DMS and OH-reactive halocarbons (trichloromethane and tetrachloroethylene). The observations showed anomalies in the variance and abundance of acetaldehyde and acetone over that expected for species with a remote terrestrial emission source and OH controlled chemical lifetime. A detailed model incorporating an explicit chemical degradation mechanism indicated in situ formation during air mass transport was on timescales longer than the atmospheric lifetime of precursor hydrocarbons or primary emission. The period over which this process was significant was similar to that of airmass motion on intercontinental scales, and formation via this route may reproduce that of a widespread diffuse source. The model indicates that continued short chain OVOC formation occurs many days from the point of emission, via longer lived intermediates of oxidation such as organic peroxides and long chain alcohols.

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