Download or read book The Development of a Simulation Model and Its Use in the Evaluation of Cattle Production Systems written by Hava E. Kahn and published by . This book was released on 1982 with total page 266 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Simulation Of Beef Cattle Production Systems And Its Use In Economic Analysis written by Thomas H Spreen and published by CRC Press. This book was released on 2019-07-11 with total page 269 pages. Available in PDF, EPUB and Kindle. Book excerpt: Economic analysis of beef cattle production has been limited by the inability to fully describe the underlying production process. Except for confined feeding of cattle, beef cattle production is the process of growing cattle who consume forages. The animal and the forage possess attributes of both factors and products of production. The production of forage constitutes one production process, animal growth is another production process, and reproduction by female animals is a third production process. Cattle production involves all three processes in such a manner that each influences the outcome of the other. Each process is itself complex and analysis is further complicated when all three are considered simultaneously.

Download or read book Modelling of Extensive Livestock Production Systems written by N. de Ridder and published by ILRI (aka ILCA and ILRAD). This book was released on 1986-01-01 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt: ILCA's policy towards modelling in the framework of livestock systems research; models and the analysis of productivity in extensive livestock systems in Israel; prediction of actual primary production under nitrogen limitation; behavioural aspects of intake at pasture in ruminats; prediction of feed intake in ruminats; relationships between chemical composition and voluntary intake of feeds by sheep and cattle; the effect of breeding season duration on production and feed consumption in grazing beef cattle in the south of Israel; adaptation of the Kahan model for a mixed farming system in southeastern Asia; appraisal of the ILCA cattle herd dynamics model using data from pastoral systems in mali and kenya; moddeling pastoral livestock production: problems and prospect; analysis of management impact in semi-arid agropastoral systems; modelling economic outcomes of livestock production systems; selection of sheep husbandy techologies under single and multiple goal constraints; types, purposes and users of models; problems related do intake.

Download or read book Development and Evaluation of a Bio economic Model for Simulating Forage beef System Performance Under Risk Conditions written by William D. McBride and published by . This book was released on 1991 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modeling Ruminant Digestion and Metabolism written by R.L. Baldwin and published by Springer Science & Business Media. This book was released on 1995-05-31 with total page 600 pages. Available in PDF, EPUB and Kindle. Book excerpt: Role of mminants in human food production; Whyan animal scientist would choose to model animal systems; Basic organization of this book; Modeling principIes and terminology; Classification of models; Objectives in modeling; The modeling process I objective statements, block diagrams, equation forms and parameterization; Steps in modeling; Setting the modeling objective; Block diagrams; Formulation of mathematical statements; Development of numerical inputs; The modeling process II - solution algorithms, model evaluations and parameter estimation; Model solution algorithms; Evaluation of management and research models; Evaluation and use of analytical models for parameter estimation; Decision support software; Animal energetic models; Thermodynamic concepts in nutrition; Historical development of bases for feeding system models; Energy requirements for maintenance and production; Equations used to estimate maintenance and costs of production; Components of maintenanace; Protein and amino acid models; Current protein and amino acid systems; Analytic models of amino aicd and protein metabolism; Dynamic modeling; Biology and algebraic models of ruminant digestion; The rumen microbes and their metabolism; Balance models of ruminant digestion; An analytical model of rumen digestion; Microbial growth elements; Biology and algebraic models of growth; Classical equations for growth; Nutritional models of growth; Concepts of lhe basic biology of growth used in mechanistic models; Biology of lactation; Decent evolution of feeding systems for lactating dairy cattle; An analytical model of nutrient transactions during lactation; Dynamic models of ruminant digestion; Early dynamic models; Current dynamic models; Dynamic models of ruminant adipose tissue metabolism; Evolution of steady-state balance model; Radioisotope tracer elemets; Dynamic models of ruminant mammary metabolism; Development of model inputs and initial parameters; Descriptions of a model of mammary gland metabolism; Dynamic models of liver and viscera metabolism; Overall structure and notation; Mechanistic, dynamic models of growth; Beef growth models; Sheep growth and metabolism model; Lactation Background on MOLL Y. CSL; The program MOLL Y. CSL; Evaluation and use of a growth and lactation model; Behavioral analyses; Sensitivity analyses; Bioeconomic analyse.

Download or read book Mathematical Modeling of Livestock Production Systems written by and published by . This book was released on 1978 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Modelling of Livestock Production Systems written by S. Korver and published by Springer Science & Business Media. This book was released on 1988-03-31 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt: A seminar in the Community Programme for the Coordination of Agricultural Research, held in Brussels, Belgium, April 7-9, 1987

Download or read book The Nutrient Requirements of Ruminant Livestock written by Agricultural Research Council (Great Britain) and published by Cabi. This book was released on 1980 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: This work discusses the nutrient requirements of all forms of ruminant livestock.

Download or read book Beef Cattle Management Systems for the Southeast written by Hines Finlayson Boyd and published by . This book was released on 1976 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two mathematical models for the evaluation of beef production systems were developed and computerized using DYNAMO programming. The first model, a cow efficiency estimator, computed the TDN requirements for a cow and her calf using variables such as animal weight and gains, seasonal changes in cow weight, cow milk production, physical activity of the animal and the quality of feed being consumed. The second model, a herd efficiency estimator, used data from the first model plus data on cattle prices, fixed cots, pregnancy and calf survival rate, death losses, heifer replacement and cullingpolicies, herd size, and TDN produced per acre from each TDN source. This model calculated biological efficiency factors such as TDN per unit of beef sold, beef produced per land unit ane economic efficiency factors including cost and net returns per unit of beef sold and net returns per land unit. The models were tested using data collected over a nine year period at the University of Florida Beef Research Unit. They were then used to evaluate five feeding and pasture systems suitable to the southeastern United States. Animal production traits, market structures and herd culling procedures were also studied. Cow size had no effect on measures of biological efficiency. In general, cow size had little or no effect on profitability except that large cows were at a disadvantage when a relatively expensive high-energy corn silage ration was fed to brood cows. Increasing milk yield improved biological efficiency, descreased cots, and ...

Download or read book Animal Production Systems Research written by and published by Agroamerica. This book was released on 1994 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Economics Of Livestock Systems In Developing Countries written by James R Simpson and published by CRC Press. This book was released on 2019-09-06 with total page 298 pages. Available in PDF, EPUB and Kindle. Book excerpt: Improvement of the world's livestock industry necessitates input from many directions. Planning by a host of national and international agencies is required in order to provide optimal stimulus in very diverse areas ranging from formulation of laws and incentives that stimulate competition yet prevent undue competition, to the optimal provision of credit. Planning is needed to carry out a complex array of interrelated research. The purpose of this book is specifically tasked with setting forth frameworks and methods for evaluation of investments and associated economic decision-making in the livestock industries of developing countries. Economists will find this book useful because it synthesizes .much material into a cohesive whole--material that is often presented in a cursory manner or overlooked as emphasis has shifted to sophisticated quantitative techniques.

Download or read book Index to Theses Accepted for Higher Degrees by the Universities of Great Britain and Ireland and the Council for National Academic Awards written by and published by . This book was released on 1984 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Feasibility of Using Simulation to Evaluate Alternative Systems of Beef Production in Northeast Brazil written by John Norman Lehker and published by . This book was released on 1970 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book British Reports Translations and Theses written by British Library. Lending Division and published by . This book was released on 1985 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Computer Simulation of Beef Cattle Production Systems in the Llanos of Columbia written by Joel Martin Levine and published by . This book was released on 1979 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt: A simulation model capable of execution on a programmable calculator was developed to study voluntary intake, liveweight change, and fertility of grade Zebu cows in the Llanos of Colombia. Organic nitrogen in the diet and meta bolic weight were used to predict intake; age, liveweight, and energy concentration were the driving variables for the maintenance prediction equation. Energy concentration was calculated as a function of crude protein and digestible organic matter, and liveweight change was predicted as a function of intake, maintenance, liveweight, and energy concentration. Multiplicative correction factors were fitted from data obtained from cow-calf experiments to adjust intake and maintenance for the effects of burning the native savanna, compensatory gain, mineral deficiency, and lactation and gestation. The correction factors were .89 for intake after burning the native savanna, 1.05 and .95 for intake and maintenance during compensatory gain, and .90 for reduced intake due to mineral deficiency. Correction factors for physiological status were 1.20 for intake during early and late lactation, and 1.40, 1.32, and 1.05 for maintenance during early lactation, late lactation, and late gestation, respectively. The correction factors for burning and compensatory gain were fitted against data from dry cows of Herds 4-5 of the Herd Systems Experiment (HSE) and yielded a Pearsonian correlation coefficient of .95 (p

Download or read book The Application of Systems Thinking in Cattle Production written by Douglas Shane and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Applying systems methods to cattle production requires investigators to think about whole systems when addressing study objectives. The research conducted for this dissertation emphasized studying whole systems using different methods. We studied cattle production systems through mathematical simulation and new indirect monitoring technologies. While the methods used for the research in this dissertation may be very different, all utilized systems methods to address the study objectives. Firstly, we applied systems thinking methods and developed a dynamic, deterministic systems simulation of cow-calf production over a 10-year horizon. This model was used to investigate the effects the duration of postpartum anestrus (dPPA) has on reproductive performance. A large range of dPPA have been reported, so various primiparous cow and multiparous cow dPPA were simulated. We found that increasing the dPPA for primiparous and multiparous cows had a negative impact on herd performance and that the dPPA is an important factor in determining cow-calf performance success. We then used the cow-calf simulation to explore the effects of breeding nulliparous cows prior to the rest of the herd, known as providing Heifer Lead Time (tHL). We found that increasing tHL improved herd performance, especially with longer dPPA for primiparous cows. Secondly, real-time location systems (RTLS) were used to indirectly monitor cattle behavior. These systems have been used to determine the amount of time cattle spend at eating and drinking locations. We modeled the probability of cattle participating in eating and drinking behavior when determined to be at these locations by RTLS and found that significant differences exist between individual calves and period of the day. Finally, we explored associations between bovine respiratory disease (BRD) and animal-to-animal contacts as determined by RTLS in beef cattle. We found that the probability of BRD diagnosis was associated with the amount of time 4 days' ago that a calf was in calf-contact with calves assumed to be shedding BRD pathogens.

Download or read book Firm Level Beef Supply written by Aditi Kumar Angirasa and published by . This book was released on 1979 with total page 374 pages. Available in PDF, EPUB and Kindle. Book excerpt: