Download or read book Genetic Evaluation of Reproductive Disorders and Their Relationships with Production and Fertility Traits of Crossbred Cattle written by Sourav Das and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Genetic Evaluation of Reproductive Traits in Crossbred Cattle written by and published by . This book was released on 2015 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Genetic Persistency Indices of Milk Production and Its Relationship with Reproductive Traits in Crossbred Cattle written by Subrata Koloi and published by . This book was released on 2018 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Exploring Different Genetic Models for Evaluation of Fertility Traits in Crossbred Cattle written by Talokar Amol Jagannath and published by . This book was released on 2017 with total page 75 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Genetics of Cattle 2nd Edition written by Dorian Garrick and published by CABI. This book was released on 2014-11-28 with total page 642 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since the time of domestication more than 10,000 years ago, cattle have played an increasingly crucial role in the development of human civilizations. Progress has been quite remarkable since the turn of the century; the sequencing of the bovine genome in 2009 launched new avenues for furthering our understanding of theoretical and practical aspects of cattle genetics. Covering a vast array of questions, this book reviews major topics from molecular and developmental genetics, disease resistance and immunogenetics to genetic improvement of dairy and beef breeds, addressing all current problems in the field. This second edition includes a new team of authors and completely new chapters on the genetics of fat production, nutrition, feed intake and efficiency, growth and body composition. Fully updated throughout, it provides a valuable resource on cattle genetics for researchers, breeders, veterinarians and postgraduate students.

Download or read book Genetic Evaluation of Crossbred Cattle for Daughter Pregnancy Rate and Production Performance Traits With CD Copy written by Sunil Kumar and published by . This book was released on 2016 with total page 73 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Genetic Analysis of Reproductive Measures in Dairy Cows and Their Relationship with Milk Production written by Felix Eduardo A. Beltramino and published by . This book was released on 1984 with total page 260 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Genetic and Phenotypic Parameters of Profit Functions Reproductive Efficiencies in Crossbred Cattle written by C. O. Reddy and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Investigations were carried out to study the relationship of profit function, life production and herd life with reproductive variables and to study the relationship between first lactation and lifetime performance and to estimate the economic returns on the basis of first lactation performance. The least square analysis showed that the differences between the two genetic groups (higher and lower crosses) were significant for all the production and profit traits. Similarly the genetic group did not show significant differences in reproductive raits viz., number of inseminations per conception (1.69 and 1.74), firsst calving interval (423 and 426 days), days open percent (36.66 and 37.13) and weight at first calving (306 and 384 kg). Based on profit per day of lif an open period of 135 days in higher crosses and 134 days in lower crosses were found to be satisfactory. The days dry were optimised at 34.22 percent 26.98 percent, 20.22 percent, 24.84 percent and 24.11 percent, for hrd life, lifetime milk yield, milk yield per day of herd life, lifetime profit and profit per day of herd life in higher crosse, respectively. It was also observed that, one standard deviation decrease in mean days dry percent could maximise all the lifetime production traits in lower crosses. Long herd life was found to be necessary for maximum profit and profit per day of herd life. The age at first calving accounted for little in all the lifetime traits in both higher and lower crosses (3.11 to 5.54 percent and 0.07 to 2.11 percent). Similar observations were made with the weight at first calving. Herd life increased gradually upto first lactation (2500 kg) in lower crosses and 3000 kg in higher crosses. Increase in first lactation increased the lifetime traits. The genetic correlations between first lactation traits and lifetime traits were higher in higher crosses. Th phenotypic corrlations among lifetime traits were positive and significant except the correlations of days dry percent with other lifetime traits.

Download or read book Genetic Evaluation of Crossbred Dairy Cattle for Milk Production Feed Efficiency and Reproduction written by Frantz Supreme and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Genetic Evaluation of Production and Fertility Traits in Karan Fries Cattle written by Shilpa Gujral and published by . This book was released on 2021 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Studies on Various Reproductive Traits in Crossbred Cattle and Their Relationship with Lunar phases written by Sajal Kumar Bhunia and published by . This book was released on 1993 with total page 92 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 Burleigh Dodds Series in Agric. This book was released on 2019-08-26 with total page 480 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dairy cattle breeding faces challenges such as reduced genetic diversity and the improvement of production over functional traits. This collection reviews the latest research on genetics, genetic diversity and advanced methods of genetic evaluation and selection.

Download or read book Combining Genotypic Phenotypic and Pedigree Information to Analyze Functional Traits in Dairy Cattle written by Aline Rocha Guarini and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Reliabilities of genomic estimated breeding values (GEBV) for functional traits, e.g. health, fertility and reproduction, remain low compared to those for production in dairy cattle. This is likely because large training populations are required for evaluation of lowly heritable traits. Different strategies have been proposed to overcome this limitation, such as the use of genotyped cows, inclusion of external bulls (multi-trait across-country evaluation, MACE), and adoption of different methodologies, such as the simultaneous use of genotyped and non-genotyped animals, known as the single-step genomic BLUP (ssGBLUP). Thus, the main objectives of this thesis were to evaluate strategies for combining genotypic, phenotypic and pedigree information to analyze functional traits in Holstein cattle and investigate the effects of two deleterious recessive haplotypes (AH1 and AH2) on reproduction performance of Canadian Ayrshire cattle. Data for various functional traits recorded in Canada and MACE estimated breeding values were obtained from the Canadian Dairy Network (CDN, Guelph, Canada). Additionally, information of carriers and non-carriers bulls for AH1 and AH2 were used to investigate their effects on reproductive performance. Genomic predictions were obtained using multi-step and single-step GBLUP under different strategies, such as adding genotyped cows in the evaluation, integrating MACE information, blending traditional and genomic evaluations, and using different proportions of polygenic effect. A genome-wide association study and functional analyses were also performed for three fertility disorders, namely retained placenta, metritis and cystic ovaries. Genomic predictions for functional traits benefited greatly from simultaneous use of phenotypes, pedigree, and genotypes. Integration of MACE data using ssGBLUP yielded the highest reliabilities compared to other methods and also helped reduce bias of genomic predictions. Effects of AH1 and AH2 on reproductive performance of Canadian Ayrshire cattle were validated. A negative effect of AH1 on stillbirth rates was observed, whereas AH2 had a negative impact on 56-day non-return rate. These findings provide valuable information on strategies to more accurately predict GEBV for functional traits in dairy cattle by adopting ssGBLUP and different sources of domestic and foreign information. Biological understanding of reproductive disorders and validated lethal haplotypes affecting fertility will help enhance accuracy of selection and mating plans in the Canadian dairy cattle breeding programs.

Download or read book Bovine Reproduction written by Richard M. Hopper and published by John Wiley & Sons. This book was released on 2014-08-18 with total page 2206 pages. Available in PDF, EPUB and Kindle. Book excerpt: Bovine Reproduction is a comprehensive, current reference providing information on all aspects of reproduction in the bull and cow. Offering fundamental knowledge on evaluating and restoring fertility in the bovine patient, the book also places information in the context of herd health where appropriate for a truly global view of bovine theriogenology. Printed in full color throughout, the book includes 83 chapters and more than 550 images, making it the most exhaustive reference available on this topic. Each section covers anatomy and physiology, breeding management, and reproductive surgery, as well as obstetrics and pregnancy wastage in the cow. Bovine Reproduction is a welcome resource for bovine practitioners, theriogenologists, and animal scientists, as well as veterinary students and residents with an interest in the cow.

Download or read book Genetic Relationships Between Male and Female Reproductive Traits in Beef Cattle written by Guillermo Gargantini and published by . This book was released on 2004 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: