Download or read book Genetic and Non Genetic Factors Affecting Production and Reproduction Traits in Dairy Cattle written by MOHAMED MOSTAFA ABD EL RAHMAN (Kand.t.) and published by . This book was released on 1991 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Study on Genetic and Non genetic Factors Affecting Growth Reproduction and First Lactation Production Traits of Crossbred Animals written by S S. Sawant and published by . This book was released on 1983 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Breeding of Dairy Cattle written by Julius Van der Werf and published by . This book was released on 2019 with total page 659 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetic Selection in Canadian Dairy Cattle written by Bernard Hagan and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Genetic evaluations for April 2018, which were computed by Canadian Dairy Network, dairy herd information, and lactation records of Holstein cows from Lactanet, were used to (i) compute realized genetic selection differentials (GSD) for economically important traits in Holstein, Ayrshire, Jersey, and Brown Swiss herds in Canada, (ii) investigate generation intervals in four dairy cattle populations, (iii) estimate genetic parameters for milk production, lactation body weight, SCS, and profit indicator traits in Holstein cows in Québec, and (iv) develop a prototype tool and visualization model to monitor selection realized in individual dairy herds. A new approach that would be more relevant to dairy producers has been used to compute realized GSD of traits of economic importance in four dairy cattle breeds in Canada. Significant GSDs were being realized for production, durability, health, fertility traits, and lifetime performance index (LPI). Greater selections were realized in the dam-to-bull (DB) and sire-to-bull (SB) pathways of selection compared with selection realized in the sire-to-cow (SC) and dam-to-cow (DC) pathways; little to no selection was realized for production, durability, and health traits in the DC path in the four dairy cattle breeds. Apart from year of conception, other non-genetic factors were mostly unimportant on the realized GSD for economically important traits while significant variations existed among herds in their realized GSD.Generation intervals (L) in all four paths of selection have been decreasing from 1980 to 2016. There have been 55%, 41%, 46%, and 38% reductions in total L in the Holstein, Ayrshire, Jersey, and Brown Swiss populations between 1980 and 2016, respectively. A significant proportion of the reductions in L occurred in the last 8 years (2009 to 2016). Herd and herd*year of birth explained significant proportion of the variations in L. This study has demonstrated that herds that used younger Artificial Insemination bulls for breeding increased their annual genetic progress at a faster rate.First to fourth lactation records of Holstein cows in Québec were used to estimate genetic and phenotypic parameters of milk production, somatic cell score (SCS), lactation body weight (BWT), cumulative milk value (MV), cumulative feed cost (FC), and margin over feed cost (MOFC). Heritability estimates for milk production traits, BWT, MV, and MOFC were moderate whereas heritability estimates for SCS and FC were low. Genetic correlations among the traits studied ranged from low to high. Strong genetic correlations existed between the same traits in different lactations with the greatest correlations found between adjacent lactations. An attempt has been made to illustrate that it is possible to slow or halt the positive genetic trends in cow body weight by incorporating BWT and milk production traits into a simple selection index.Finally, a prototype software tool and visualization model were developed to help dairy producers and advisors monitor GSD in their herds, and compare the selection they are making with a number of benchmarks. The concept of this prototype software tool is applicable to all livestock species for which genetic evaluations are routinely computed and published. It is expected that producers would use this software tool to monitor what selection they are making in their herds and make changes if they are moving in an unintended direction"--
Download or read book Genetic Trends and Relationships of Production and Reproduction in Guernsey Dairy Cattle written by Suleiman Abukres Hermas and published by . This book was released on 1984 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Trends and Advances in Veterinary Genetics written by Muhammad Abubakar and published by BoD – Books on Demand. This book was released on 2017-03-22 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is very important to understand the recent advances and basic concepts of veterinary genetics to explore the possibilities for control of diseases in animals. They are also significant for enhancing animal production and reproduction. Our book Trends and Advances in Veterinary Genetics provides a concise introduction and details to the aspects of genetics relevant to animal science and production. This is the first edition of the book so it covers the introductory level of topics which are ideal for veterinary students, classroom use, and practitioners who require more guidance with genetics. The book coverage includes the following main sections: Biotechnology and Reproductive Genetics, Advances in Embryonic Genetics, Conservation and Basic Genetics, and Veterinary Genetics and Future. Each book section comprises two chapters from renowned experts from the area and gives readers a unique opportunity to explore the topic.
Download or read book Milk Production and Reproductive Performances of Cross Breeds Cattle written by Wassie Teketay and published by LAP Lambert Academic Publishing. This book was released on 2015-10-20 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main goal of this book is to share knowledge on milk production and reproductive performances of cross-bred cattle and the effect of both genetic and non genetic factors on these performances based on research results which are conducted in different areas on different cross- bred cattle. Production environments vary as a result of different management practices and constantly changing climatic conditions leading to variability in animal performance. An animal of high genetic value may perform dismally when the production environment is not right due to the negative interaction between the animal's genes and its environment. This book is made up of two parts; the first part contain daily milk yield, lactation milk yield and lactation length of different cross-breds with reasonable explanation and factors affecting this performances. The second part provides good information on reproductive performances of cross-bred cattle and the effect of both genetic and non genetic factors on this performance based on research results. Both parts have useful information for researches, dairy business man and for lectures.
Download or read book Genetic Analysis of Lifetime Production and Reproduction Traits of Dairy Cattle written by Ranjodhan Singh Sahota 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 Genetic factors affecting fertility growth health and longevity in dairy cattle written by Joel Ira Weller and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetics of Animal Health and Disease in Livestock written by Bianca Castiglioni and published by MDPI. This book was released on 2021-06-02 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wood surface attributes can be established by examining its several different physical or chemical properties. Differences in the wood surfaces occur between the manufacturing and post-treatment processes as well. Understanding how their unique anisotropic molecular organization, chemical linkages, branching, and other molecular features govern micro- and macroscale accessibility is essential for coating and complex modification processes. It is therefore important for scientific as well as practical reasons to qualify and quantify the effects of wood surface treatments and modifications. Challenges still exist to fully understanding the effect of the numerous applied chemicals and the wide range of treatment processes on wood surfaces.
Download or read book Safety of Genetically Engineered Foods written by National Research Council and published by National Academies Press. This book was released on 2004-07-08 with total page 254 pages. Available in PDF, EPUB and Kindle. Book excerpt: Assists policymakers in evaluating the appropriate scientific methods for detecting unintended changes in food and assessing the potential for adverse health effects from genetically modified products. In this book, the committee recommended that greater scrutiny should be given to foods containing new compounds or unusual amounts of naturally occurring substances, regardless of the method used to create them. The book offers a framework to guide federal agencies in selecting the route of safety assessment. It identifies and recommends several pre- and post-market approaches to guide the assessment of unintended compositional changes that could result from genetically modified foods and research avenues to fill the knowledge gaps.
Download or read book Factors Affecting Yield and Milk Composition in Dairy Animals written by Never Assan and published by LAP Lambert Academic Publishing. This book was released on 2014-12-30 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: Milk is a nutritious, cost-efficient source of protein, minerals and vitamins. Cattle, goats and sheep have been the major sources of milking for human consumption. However, these species' milk yield and composition is known to be influenced by genetic and non-genetic factors. This is on the background that genetic factors such as the genotype are difficult to control, unless through selective breeding. There are variations in milk yield and composition, not only between, but also within species, because of diversity among genotypes, management practices, stage of lactation, etc., and also interactions among these factors. These environmental and physiological factors (stage of lactation, pregnancy, prolificacy, etc) greatly influence the amount and composition of milk that is actually produced. Some non-genetic factors, such as the nutrition and management of the milking animals can be manipulated by the dairy farmer to improve milk yield and produce high quality milk. This book attempts to explore the influence of genetics and some non-genetic factors on yield and milk composition in cattle, goat and sheep.
Download or read book Breeding for robustness in cattle written by Marija Klopcic and published by BRILL. This book was released on 2023-09-04 with total page 281 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 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 Problems of Evolution written by G. F. Gauze and published by . This book was released on 1947 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Genetic Aspects of Dairy Cattle Breeding written by Ivar Johansson and published by . This book was released on 1961 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: At the present time there is a call for information on breeding procedures which cannot always be supplied because decisive experiments are lacking. The purpose of this little volume is to give a survey of the present knowledge in regard to the genetic of economically important characters of dairy cattle and the methods for their improvement.
Download or read book Breeding Genetics and Safety Production of Dairy Cattle written by Zhi Chen and published by Mdpi AG. This book was released on 2023-08-02 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The integration of various omics information-such as DNA, RNA, protein, and epigenetic regulation-brings new opportunities for the mining of important economic traits of animals and the analysis of molecular genetic mechanisms. Over the last three decades, world milk production has increased by more than 59%, from 530 million tonnes to 843 million tonnes. However, the genetic mechanisms behind milk fat traits remain largely undetermined. Milk is rich in fatty acids, proteins, and eight essential amino acids needed by the human body. The fatty acids in milk, namely, dodecylic acid, myristic acid, stearic acid, and palmitic acid, are the main energy substances in the human body, accounting for approximately 5, 10, 8, and 27 % of total fatty acids, respectively. Thus, decoding the genetics of milk fat traits can have a potential impact on product development, international trade, and consumption of milk components. This Special Issue focuses on applying the aforementioned advances to explore gene regulation and its molecular mechanisms in milk fat traits. The topics include but are not limited to: Research and application surrounding the genetic basis of important milk fat traits; Mining and function of excellent genetic resources for milk fat traits; Genetics of nutrition metabolism regulation and efficient production of milk fat; Epigenetic research on genes implicated in milk fat traits; High-throughput sequencing research surrounding genetics of milk fat traits; Construction of gene (including circRNA, lincRNA, miRNA, and mRNA) expression regulatory network maps.
