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Author : Oscar Norberto Di Marco
Publisher :
ISBN 13 :
Total Pages : 310 pages
Book Rating : 4.:/5 (34 download)
Download or read book Modeling Analysis of Growth in Steers written by Oscar Norberto Di Marco and published by . This book was released on 1986 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Thomas H Spreen
Publisher : CRC Press
ISBN 13 : 1000239616
Total Pages : 269 pages
Book Rating : 4.0/5 (2 download)
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.
Author : James W. Oltjen
Publisher :
ISBN 13 :
Total Pages : 280 pages
Book Rating : 4.:/5 (16 download)
Download or read book A Model of Beef Cattle Growth and Composition written by James W. Oltjen and published by . This book was released on 1983 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Brandi Marie Bourg
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (37 download)
Download or read book Evaluation of a Mathematical Model in Predicting Intake of Growing and Finishing Cattle written by Brandi Marie Bourg and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Cattle Value Discovery System (CVDS) was developed to predict growth and feed requirements of individual cattle fed in groups based on animal, diet, and environment information (Tedeschi et al., 2006). Evaluations of the CVDS using several databases of finishing cattle were conducted to determine the accuracy and precision of the model in predicted dry matter required (DMR) of pen-fed cattle. As well, the sensitivity of the model's predictions to deviations from actual ration metabolizable energy (ME) value was conducted. A meta-analysis of growing and finishing steers evaluated to model's accuracy in predicting DMR of individually fed steers, and the relationships between several model-predicted variables and actual performance and efficiency measures. Results for the first CVDS model evaluation involving pen-fed Santa Gertrudis cattle fed finishing diets revealed that accurate predictions of DMR are possible. The average mean bias for both steers and heifers was 2.43%. The sensitivity analysis of dietary ME values revealed that the model tends to consistently over- and under-predict DMR when the ME values are under- and over-estimated, respectively. However the ranking of pens was not affected by this mis-estimation of diet ME. In the second evaluations, both methods (mean body weight; MBW, dynamic iterative model; DIM) of CVDS were highly accurate and precise in allocating feed to pens of steers fed diverse types of diets and environmental conditions, with both models having a mean bias under 4%. The DIM model was slightly more accurate than the MBW model in predicting DMR. An evaluation of sources of variation revealed that for both models a large portion of the error was random, indicating that further work is needed to account for this variation. The meta-analysis study revealed that the model was able to account for 64% and 67% of the variation in observed dry matter intake (DMI) for growing and finishing steers, respectively. The two model-predicted efficiency measures, the ratio of DMR to average daily gain (ADG) and predicted intake difference (PID), were strongly to moderately correlated with their observed efficiency counterparts. In growing and finishing steers, DMR: ADG was able to account for 76% and 64% of the variation in observed feed conversion ratio (FCR) in growing and finishing studies, respectively. Strong correlations were also found between residual feed intake (RFI) and PID, suggesting that there may also be some similarity on these two measurements.
Author : Richard C. Porter
Publisher :
ISBN 13 :
Total Pages : 54 pages
Book Rating : 4.3/5 (9 download)
Download or read book The Uses of Economic Models in Analysis of the Cattle Sector written by Richard C. Porter and published by . This book was released on 1979 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : R. Lynn Williams
Publisher :
ISBN 13 :
Total Pages : 32 pages
Book Rating : 4.:/5 (31 download)
Download or read book Economic Impact of Alternative Growth Promotant Strategies on the United States Beef Industry written by R. Lynn Williams and published by . This book was released on 1991 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: This bulletin analyzes economic impacts of alternative growth promotant strategies on the United States (U.S.) beef industry at the cow/calf, stocker, feedlot, wholesale, and retail levels. Production scenarios included implanting at each production level, never implanting, implanting at the cow / calf level only, implanting at the cow / calf and stocker levels, implanting at the feedlot level only, and implanting at the stocker and feedlot levels. The production scenarios were evaluated for the same number of days on feed and feeding to the same slaughter weight. Estimates of the physical effects of alternative implant strategies were obtained by use of the Beef Cattle Growth Model developed at Texas A&M University. Information developed by the model included live, carcass, and retail product weights, carcass fat percentages, feed consumed, and estimated U.S. yield and quality grades by alternative implant scenarios. The study also provides estimates of changes in net returns to producers and cattle feeders and in wholesale and retail gross revenues as implant strategies undergo change.
Author : Fred Silver Putney
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (811 download)
Download or read book A Study of the Growth of Steers ... written by Fred Silver Putney and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Merritt Cluff
Publisher :
ISBN 13 :
Total Pages : 224 pages
Book Rating : 4.E/5 ( download)
Download or read book Modeling Livestock Stabilization written by Merritt Cluff and published by . This book was released on 1986 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Academies of Sciences, Engineering, and Medicine
Publisher : National Academies Press
ISBN 13 : 0309317029
Total Pages : 22 pages
Book Rating : 4.3/5 (93 download)
Download or read book Nutrient Requirements of Beef Cattle written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2016-06-16 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since 1944, the National Research Council (NRC) has published seven editions of the Nutrient Requirements of Beef Cattle. This reference has guided nutritionists and other professionals in academia and the cattle and feed industries in developing and implementing nutritional and feeding programs for beef cattle. The cattle industry has undergone considerable changes since the seventh revised edition was published in 2000 and some of the requirements and recommendations set forth at that time are no longer relevant or appropriate. The eighth revised edition of the Nutrient Requirements of Beef Cattle builds on the previous editions. A great deal of new research has been published during the past 14 years and there is a large amount of new information for many nutrients. In addition to a thorough and current evaluation of the literature on the energy and nutrient requirements of beef in all stages of life, this volume includes new information about phosphorus and sulfur contents; a review of nutritional and feeding strategies to minimize nutrient losses in manure and reduce greenhouse gas production; a discussion of the effect of feeding on the nutritional quality and food safety of beef; new information about nutrient metabolism and utilization; new information on feed additives that alter rumen metabolism and postabsorptive metabolism; and future areas of needed research. The tables of feed ingredient composition are significantly updated. Nutrient Requirements of Beef Cattle represents a comprehensive review of the most recent information available on beef cattle nutrition and ingredient composition that will allow efficient, profitable, and environmentally conscious beef production.
Author : Thomas H Spreen
Publisher : CRC Press
ISBN 13 : 100031149X
Total Pages : 283 pages
Book Rating : 4.0/5 (3 download)
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 283 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.
Author :
Publisher :
ISBN 13 :
Total Pages : 132 pages
Book Rating : 4.:/5 (89 download)
Download or read book Beef 2007-08 written by and published by . This book was released on 2009 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sidney Walter Reginald Cox
Publisher : Brill Wageningen Academic
ISBN 13 :
Total Pages : 368 pages
Book Rating : 4.:/5 (89 download)
Download or read book Precision Livestock Farming '05 written by Sidney Walter Reginald Cox and published by Brill Wageningen Academic. This book was released on 2005 with total page 368 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Precision Livestock Farming presents the latest scientific results from worldwide research, field studies and practical application. The book contains peer-reviewed papers that were presented at the 2nd European Conference on Precision Livestock Farming.The major topics in the book are animal welfare; food quality (including traceability of origin) and environmental pollution (including treatment of animal waste). The wide range of research topics reported will be a valuable resource for researchers, advisors, teachers and professionals in agriculture long after the conference has finished."
Author : Henry C. Gilliam
Publisher :
ISBN 13 :
Total Pages : 72 pages
Book Rating : 4.:/5 (31 download)
Download or read book The U.S. Beef Cow-calf Industry written by Henry C. Gilliam and published by . This book was released on 1984 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: Extract: The number of beef cows in each of the four major U.S. cow-calf production regions declined by about one-fifth between 1975 and 1980 in response to sharp reductions in feeder cattle prices and increases in production costs during the midseventies. Several physical measures of performance indicate that most resources were used more efficiently in beef cow-calf production in 1980 than in 1975. This report identifies the structural characteristics and operating practices for beef cow-calf production operations in the United States.
Author : Miroslav Kaps
Publisher :
ISBN 13 :
Total Pages : 230 pages
Book Rating : 4.:/5 (422 download)
Download or read book Growth and Maturation of Angus Cattle written by Miroslav Kaps and published by . This book was released on 1997 with total page 230 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study was to estimate genetic parameters for growth, maturity and carcass traits, and to analyze relationship of each of these traits with mature weight. Growth data utilized in the study consisted of repeated weight measurements of 3044 Angus cows. A Brody growth curve was fitted to the data for each cow individually in order to predict asymptotic (mature) weight, age when animal reached 65% of mature weight, and weights, growth rates, degrees of maturity and relative growth rates at 365 and 550 days of age. Carcass data consisted of 3477 records of steers, including hot carcass weight, back fat-thickness, rib-eye area, cutability and marbling score. Genetic parameters of mature weight were estimated from a single-trait animal model for asymptotic weight, a two-trait animal model for asymptotic and weaning weight, and a two-trait animal model for repeated mature weights (measured after 4 y of age) and weaning weight. Heritability estimates for growth and carcass traits were obtained by restricted maximum likelihood from a set of two-trait animal models considering a given trait and weaning weight which was in the model to account for any effect of culling. Similarly, genetic correlations between mature weight and other traits were obtained from a set of three-trait models. A sample of 29943 animals was used for weaning weight measurements. Fixed effects in the models included weaning, cow and carcass contemporary groups. For the carcass traits the effect of slaughter age was included in the model as a covariate. Random effects in the model included direct genetic, maternal genetic and permanent environmental effects for weaning weight, but only direct genetic and repeated measurements (if in the model) for each of the other traits. Estimates of heritability for mature weight were. 44,.51 and. 57 for the single-trait model with asymptotic weight, two-trait model with asymptotic weight and two-trait model with repeated weights, respectively. The reduced heritability estimate from the single-trait model was most likely due to the effect of culling, thus, a genetic evaluation for mature size should be considered in a multiple-trait model including mature weight as well as some earlier measured growth trait. (Abstract shortened by UMI.).
Author : Kennedy Dzama
Publisher :
ISBN 13 :
Total Pages : 176 pages
Book Rating : 4.:/5 (344 download)
Download or read book Genetic Simulation of Beef Cattle Production for Growth and Milk Production written by Kennedy Dzama and published by . This book was released on 1993 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : James Kundael Kileghua Msechu
Publisher :
ISBN 13 :
Total Pages : 228 pages
Book Rating : 4.:/5 (154 download)
Download or read book An Analysis of the Relationships Between Growth Characteristics of Angus Steers written by James Kundael Kileghua Msechu and published by . This book was released on 1979 with total page 228 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : H. de Boer
Publisher : Springer Science & Business Media
ISBN 13 : 9400997566
Total Pages : 751 pages
Book Rating : 4.4/5 (9 download)
Download or read book Patterns of Growth and Development in Cattle written by H. de Boer and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 751 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication contains the proceedings of a seminar held in Ghent, Belgium on October 11th-13th 1977, under the auspices of the Commission of the European Communities, as part of the EEC programme of co-ordination of research on beef production. The seminar was initiated by the scientific working group on 'Carcass and Meat Quality' and attracted the interest of the working groups on 'Genetics and Selection' and on 'Nutrition and Management'. Consequently it developed into a multi-disciplinary programme, organised under the responsibility of the working group on Carcass and Meat Quality. This group comprised Ir. H. de Boer (Chairman), Netherlands; Prof. R. Boccard, France; Dr D.E. Hood, Ireland; Dr R.W. Pomeroy, UK; Dr A. Romita, Italy; Professor Dr L. Sch~n, Fed. Rep. of Germany; Mr P. L'Hermite, CEC; and Dr J.C. Tayler, UK (adviser to the CEC). In view of the broad scope of the subject, a special plan ning meeting was organised, involvi.ng experts from the different disciplines involved. The additional participants were: Dr B. Bech Andersen, Denmarkj Dr A.J.H. van Es, Netherlands; Prof. Dr J. Martin, Belgium; Dr. St.C.S. Taylor, UK. The multidisciplinary scope of this ~eminar follows a series of seminars in 1975-76 on more specific aspects of beef production research in the individual fields involved. It seems logical that further seminars should integrate the approaches by different disciplin~s in order to achieve a balanced programme of research on the very complex topic of beef production.
