Download or read book Comparison of the Reproductive Efficiency of Purebred and Crossbred Dairy Cattle written by Jorge Alfredo Velasco and published by . This book was released on 1971 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book General Reproductive Performance of Crossbred and Contemporary Purebred Dairy Cattle written by Hari Kant B. Parekh and published by . This book was released on 1971 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Comparison of Purebred and Grade Dairy Cows written by John Chambers McDowell and published by . This book was released on 1928 with total page 674 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Ecology Capitalism and the New Agricultural Economy written by Gilles Allaire and published by Routledge. This book was released on 2018-11-14 with total page 317 pages. Available in PDF, EPUB and Kindle. Book excerpt: With increasing pressure on resources, the looming spectre of climate change and growing anxiety among eaters, ecology and food are at the heart of the political debates surrounding agriculture and diet. This unique contribution unravels agri-environmental issues at different spatial levels, from local to global, documenting the major shifts in agriculture from a long-term perspective. The book begins by exploring the changes in the industrialisation and socialisation of agriculture over time, through the lens of institutional economics including The French Regulation School and Conventions Theory. Building on Polanyi’s ‘Great Transformation’, the chapters in this volume analyse long-term and contemporary changes in agriculture and food systems that have occurred throughout the last few centuries. Key chapters focus on the historical changes in provisioning and the social relations of production, consumption, and regulation of food in different socio-political contexts. The future of agriculture is addressed through an analysis of controversial contemporary political claims and their engagement with strategies that aim to improve the sustainability of agriculture and food consumption. To shed light on ongoing changes and the future of food, this book asks important environmental and social questions and analyses how industrial agriculture has played out in various contexts. It is recommended supplementary reading for postgraduates and researchers in agricultural studies, food studies, food policy, the agri-food political economy and political and economic geography.
Download or read book Breeding for Robustness in Cattle written by Marija Klopčič and published by Brill Wageningen Academic. This book was released on 2009 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The past decade has revealed unfavourable trends in e.g. fertility, udder health and locomotion in some major dairy cattle breeds due to a large increase in production and insufficient consideration of functional traits in the breeding goals. Such unfavourable trends in some functional traits increase costs. Additionally, the enlargement of herds leads to less available labour time per individual cow. This asks for cows that are easy to handle. At the same time, society is demanding a higher welfare standard of animals. These contradicting developments have increased the desire for so called more robust animals. Robustness can be defined as 'the ability to maintain homeostasis in commonly accepted and sustainable herds of the near future'; or 'the ability of the cow to function well in the environment she lives in as well as in a wide range of climates and production systems'. This book contains a series of articles (26) dealing with the concept of robustness, including aspects like evolution, genetics, environment, animal health and welfare, and integrity. Besides the major functional traits also the links to energy balance, hot climatic conditions, and the attitude and input of stakeholders towards robustness as part of the breeding program are discussed. This book is the first attempt to summarise the available knowledge concerning this topic in cattle, making this book unique. The contributions are from authors of 16 countries from all over the world. However, the focus is presently on farm animal level, while in future robustness of the whole production system may also require additional attention.
Download or read book A Compasison of the General Merits of Purebred and Crossbred Dairy Cattle Resulting of Cross Breeding written by R.W. Teouchberry and published by . This book was released on 1978 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Crossbreeding Bos Indicus and Bos Taurus for Milk Production in the Tropics written by E. P. Cunningham and published by Bernan Press(PA). This book was released on 1987 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lifetime Production and Reproduction Efficiency of Different Grades of Crossbred Dairy Cattle written by Rajinder Singh Matharu and published by . This book was released on 1978 with total page 83 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Agroecological Transitions From Theory to Practice in Local Participatory Design written by Jacques-Eric Bergez and published by Springer. This book was released on 2019-02-28 with total page 335 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Open Access book presents feedback from the ‘Territorial Agroecological Transition in Action’- TATA-BOX research project, which was devoted to these specific issues. The multidisciplinary and multi-organisation research team steered a four-year action-research process in two territories of France. It also presents: i) the key dimensions to be considered when dealing with agroecological transition: diversity of agriculture models, management of uncertainties, polycentric governance, autonomies, and role of actors’ networks; ii) an operational and original participatory process and associated boundary tools to support local stakeholders in shifting from a shared diagnosis to a shared action plan for transition, and in so doing developing mutual understanding and involvement; iii) an analysis of the main effects of the methodology on research organisation and on stakeholders’ development and application; iv) critical analysis and foresights on the main outcomes of TATA-BOX, provided by external researchers.
Download or read book Nutrition and Lactation in the Dairy Cow written by Philip C. Garnsworthy and published by Elsevier. This book was released on 2013-10-22 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nutrition and Lactation in the Dairy Cow is the proceedings of the 46th University of Nottingham Easter School in Agricultural Science. Said symposium was concerned with the significant advances in the field of nutrition and lactation in the dairy cow. The book is divided in five parts. Part I deals with the principles behind nutrition and lactation of cows. Part II discusses the cow's nutrient interactions; responses to nutrients that yield protein and energy; and the influence of nutrient balance and milk yields. Part III tackles the efficiency of energy utilization in cows and its relation to milk production. Part IV talks about food intake of cows and the factors that affect it, while Part V deals with the different feeding systems for cows. The text is recommended for those involved in raising cows and dairy production, especially those who would like to know more and make studies about the relationship of nutrition and lactation of cows.
Download or read book Comparison of Purebred and Grade Dairy Cows written by John Chambers McDowell and published by . This book was released on 1928 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Increasing Reproductive Efficiency and Progeny Performance Through Improved Embryonic and Genetic Selection in Cattle written by Katylyn Jo Richardson and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A series of studies were completed to determine if reproductive efficiency and offspring performance could be improved through the implementation of a novel method of embryonic selection and the proliferation of a desirable genotype in cattle. The first study evaluated the effectiveness of an Embryo Chamber to distinguish between viable and nonviable bovine embryos based on specific gravity of the embryo. In this study, 19 in vitro produced (IVP) and 15 in vivo derived (IVD) Grade 1 embryos were individually placed into a 0.5 mL semen straw of media and allowed to descend through the Embryo Chamber. Descent time through a vertical, one-centimeter timing region was recorded, and embryos were removed from the chamber and either transferred into recipient females or cryopreserved and transferred at a later date. In order to determine if Embryo Chamber evaluation had an effect on pregnancy status, 27 IVP and 12 IVD, Grade 1 embryos that were not evaluated with the Embryo Chamber were also transferred into recipient females at the time of project embryo transfer. Pregnancy was later determined via rectal ultrasound and recorded. There was no significant difference in conception rates between embryos evaluated with the Embryo Chamber and those not evaluated with the Embryo Chamber, indicating that chamber analysis had no negative impact on viability of both IVP (P = 0.54) and IVD (P = 0.93) embryos. Of the 34 total embryos evaluated with the Embryo Chamber, 22 resulted in successful implantation and pregnancy, with 13 pregnancies (68.4%) by IVP embryos and 9 (60%) by IVD. There was no difference in average descent time of pregnant and non-pregnant embryos for IVP (P = 0.54) or IVD embryos (P = 0.24). When divided into groups according to descent time, 32% of all observations for IVP embryos occurred between 30 to 50 s with a 66.7% conception rate, and 42% occurred between 70 to 90 s with a 75% conception rate (P = 0.85). For IVD, 60% of all observations occurred between 90 to 110 s, with a conception rate of 66.7% (P = 0.35). Analysis of the correlation between descent group and pregnancy outcome or descent time and pregnancy outcome showed no strong correlation for either production method. Though not significant, the trends highlighted in this data lend support to previous research with variations of the Specific Gravity Device. Further research is needed to thoroughly evaluate the potential of this technology as a method of noninvasive assessment of embryo quality. The second study evaluated the merit of an F1 USDA Prime, Yield Grade 1 carcass clone sire as a terminal sire in the beef x dairy production system. In this study, the clone sire, AxG1, and a purebred Angus reference sire, Foundation, were bred to dairy cows (n = 1,430) at a commercial Jersey dairy in the Texas Panhandle. Performance data from resulting offspring of these matings was collected and analyzed to assess differences in performance between the two sires. Post-partum dam data was also collected to determine if there were any negative impacts of sire on the subsequent reproductive performance of the dams. Conception rates were 39% for AxG1 and 30% for Foundation (P
Download or read book Genomically Enhanced Predictions of Dairy Cattle Fertility written by Emily Marie Sitko and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Research presented in this thesis aimed at improving the efficiency of dairy farms through the development of targeted reproductive management strategies (TRM) based on genomically enhanced predictions of fertility, and the elucidation of associations between genetic merit for fertility and biological outcomes that affect dairy cow reproductive performance.Chapter II and III present the results of an experiment designed to compare the association between genetic merit for fertility and reproductive and profitability outcomes of cows submitted for artificial insemination (AI) with management programs that prioritized AI at detected estrus (AIE) or timed AI (TAI). Another objective was to determine if cows with different genetic potential for fertility would present a distinct response to the strategies compared. The study presented in Chapter IV and V characterized associations between genetic merit for fertility and biological parameters known to alter reproductive performance of cows. Results presented in Chapter II and III indicated that primiparous Holstein cows of superior genetic merit for fertility had better reproductive performance than cows of inferior genetic merit for fertility regardless of the type of reproductive management used. In addition, the effect of TRM based on genetic merit for fertility on reproductive performance depended on the outcome or sets of outcomes of interest evaluated. For example, cows of superior and intermediate genetic merit for fertility had greater P/AI when managed with the predominant TAI program but reduced days to pregnancy when managed with the program that prioritized AIE. Cows of inferior fertility also had greater first service P/AI with the program that prioritized TAI but had similar days to pregnancy with both management strategies. From an economic standpoint, cows of inferior fertility had greater cash flow than cows of superior fertility. For cows in specific fertility groups, the effects of the reproductive management strategies compared generated differences in cash flow of potential value for commercial dairy farms. The study presented in Chapter IV and V demonstrated a potential association of genomic merit for fertility with physiological and endocrine parameters known to affect reproductive performance of dairy cows. Particularly, cows of inferior genetic merit for fertility had poorer uterine health, decreased response to synchronization of estrus and ovulation, and were more likely to present altered ovarian and hormonal phenotypes that led to more frequent expression of atypical estrous cycles as compared with cows of superior genetic merit for fertility. Overall, we observed that genetically enhanced predictions of fertility might be a suitable tool for decision making in TRM. Additionally, the value of TRM programs for cows of different genetic merit for fertility might be on improving aspects of herd management such as simplifying program implementation or reducing reliance on hormonal interventions while maintaining acceptable levels of reproductive performance. An improved understanding of biological differences associated with genetic variation, such as our observations in Chapter IV and V, may be beneficial for the development of novel TRM and technologies to improve the reproductive efficiency of dairy cattle. This novel information could also support the development of new traits for selection of fertility.
Download or read book Sustainable Food Production written by Paul Christou and published by Springer. This book was released on 2012-12-05 with total page 1869 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gathering some 90 entries from the Encyclopedia of Sustainability Science and Technology, this book covers animal breeding and genetics for food, crop science and technology, ocean farming and sustainable aquaculture, transgenic livestock for food and more.
Download or read book Breeding Strategy to Improve Ethiopian Boran Cattle for Meat and Milk Production written by and published by ILRI (aka ILCA and ILRAD). This book was released on 2011-01-01 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Milk Production from Pasture written by Colin William Holmes and published by . This book was released on 1984 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Animal Genomics written by Bhanu P. Chowdhary and published by S. Karger AG (Switzerland). This book was released on 2003 with total page 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication provides an update on the current status of gene maps in different livestock and pet/companion animal species. The findings summarized in species specific commentaries and original articles testify the rapid advances made in the field of animal genomics. Of significant interest is the fact that current investigations are providing headways for two important and exciting research fronts: targeted high-resolution mapping leading to the application of genomic information in addressing questions of economic and biological significance in animals, and the initiation of whole genome sequencing projects for some of the animal species. Like in humans and mice, this will set the stage for a new level of research and real time complex analysis of the genomes of these species. Animal Genomics signifies the beginning of a new era in this field and celebrates the achievements of the past 20 years of genomics research. It will be of special interest to researchers involved in genome analysis - both gross chromosomal as well as molecular - in various animal species, and to comparative and evolutionary geneticists.
